基本情報

所属

• 保健科学研究院　保健科学部門　健康科学分野

職名

• 教授

学位

• 経営管理修士(専門職)（小樽商科大学）
• 博士（医学）（北海道大学）
• 修士（医科学）（慶應義塾大学）

ホームページURL

https://oga911.wixsite.com/oga-lab

J-Global ID

• 200901078708719223

研究キーワード

• 医療情報学   医療管理学   医療経済学   

研究分野

• ライフサイエンス / 医療管理学、医療系社会学

担当教育組織

•  学士課程　医学部（保健学科）
•  修士課程　保健科学院
•  博士課程　保健科学院

職歴

• 2024年01月 - 現在 室蘭工業大学 大学院工学研究科 しくみ解明系領域 教授
• 2009年04月 - 現在 北海道大学病院 医療情報企画部 教授(兼任)
• 2008年04月 - 現在 北海道大学 大学院保健科学研究院 教授
• 2015年04月 - 2022年03月 北海道大学 環境健康科学研究教育センター センター長
• 2011年04月 - 2022年03月 北海道大学 環境健康科学研究教育センター 教授(兼任)
• 2006年12月 - 2008年03月 北海道大学 医学部 保健学科 教授
• 2002年04月 - 2006年11月 北海道大学 医学部 保健学科 助教授
• 2002年 - 2003年 北海道大学 医療技術短期大学部 助教授
• 2000年 - 2002年 北海道大学 医療技術短期大学部 助手
• 1999年 - 2000年 学術振興会特別研究員（DC） 研究員
• 1998年 エイズ予防財団リサーチレジデント 研究員
• 1989年 - 1991年 札幌北楡病院放射線科診療放射線技師 職員（医療系）

学歴

• 2005年04月 - 2007年03月   小樽商科大学   大学院商学研究科専門職課程   アントレプレナーシップ専攻
• 1997年04月 - 2001年03月   北海道大学   医学研究科博士課程   社会医学系専攻
•         - 1997年   慶應義塾大学   医学研究科修士課程   医科学専攻
•         - 1995年   室蘭工業大学   工学部   情報工学科
•         - 1989年   北海道大学   医療技術短期大学部   診療放射線技術学科

所属学協会

• 日本医療情報学会   日本放射線技術学会   日本医療・病院管理学会   

研究活動情報

論文

• Assessment of changes in vessel area during needle manipulation in microvascular anastomosis using a deep learning-based semantic segmentation algorithm: A pilot study.

  Minghui Tang, Taku Sugiyama, Ren Takahari, Hiroyuki Sugimori, Takaaki Yoshimura, Katsuhiko Ogasawara, Kohsuke Kudo, Miki Fujimura

  Neurosurgical review 47 1 200 - 200 2024年05月09日 

  Appropriate needle manipulation to avoid abrupt deformation of fragile vessels is a critical determinant of the success of microvascular anastomosis. However, no study has yet evaluated the area changes in surgical objects using surgical videos. The present study therefore aimed to develop a deep learning-based semantic segmentation algorithm to assess the area change of vessels during microvascular anastomosis for objective surgical skill assessment with regard to the "respect for tissue." The semantic segmentation algorithm was trained based on a ResNet-50 network using microvascular end-to-side anastomosis training videos with artificial blood vessels. Using the created model, video parameters during a single stitch completion task, including the coefficient of variation of vessel area (CV-VA), relative change in vessel area per unit time (ΔVA), and the number of tissue deformation errors (TDE), as defined by a ΔVA threshold, were compared between expert and novice surgeons. A high validation accuracy (99.1%) and Intersection over Union (0.93) were obtained for the auto-segmentation model. During the single-stitch task, the expert surgeons displayed lower values of CV-VA (p < 0.05) and ΔVA (p < 0.05). Additionally, experts committed significantly fewer TDEs than novices (p < 0.05), and completed the task in a shorter time (p < 0.01). Receiver operating curve analyses indicated relatively strong discriminative capabilities for each video parameter and task completion time, while the combined use of the task completion time and video parameters demonstrated complete discriminative power between experts and novices. In conclusion, the assessment of changes in the vessel area during microvascular anastomosis using a deep learning-based semantic segmentation algorithm is presented as a novel concept for evaluating microsurgical performance. This will be useful in future computer-aided devices to enhance surgical education and patient safety.
• Optimal Transport System for Acute Ischemic Stroke Patients: A Cost-Effectiveness Analysis.

  Yasuhiro Morii, Toshiya Osanai, Kensuke Fujiwara, Yuji Tani, Soichiro Takamiya, Takumi Tanikawa, Katsuhiko Ogasawara

  Studies in health technology and informatics 310 1558 - 1559 2024年01月25日 

  This study conducted cost utility analysis comparing 4 systems of transporting acute ischemic stroke patients in Hokkaido, Japan. Hypothetical patients were generated on a geographic information system, and their outcomes were estimated according to their transport time to hospitals administering tissue plasminogen activator and/or endovascular thrombectomy. The transport systems where a neurointerventionist traveled for earlier endovascular thrombectomy were most cost-effective in some rural areas, while direct transportation to comprehensive stroke centers was more cost-effective in other areas.
• Deep learning-based video-analysis of instrument motion in microvascular anastomosis training.

  Taku Sugiyama, Hiroyuki Sugimori, Minghui Tang, Yasuhiro Ito, Masayuki Gekka, Haruto Uchino, Masaki Ito, Katsuhiko Ogasawara, Miki Fujimura

  Acta neurochirurgica 166 1 6 - 6 2024年01月12日 [査読有り]
   

  PURPOSE: Attaining sufficient microsurgical skills is paramount for neurosurgical trainees. Kinematic analysis of surgical instruments using video offers the potential for an objective assessment of microsurgical proficiency, thereby enhancing surgical training and patient safety. The purposes of this study were to develop a deep-learning-based automated instrument tip-detection algorithm, and to validate its performance in microvascular anastomosis training. METHODS: An automated instrument tip-tracking algorithm was developed and trained using YOLOv2, based on clinical microsurgical videos and microvascular anastomosis practice videos. With this model, we measured motion economy (procedural time and path distance) and motion smoothness (normalized jerk index) during the task of suturing artificial blood vessels for end-to-side anastomosis. These parameters were validated using traditional criteria-based rating scales and were compared across surgeons with varying microsurgical experience (novice, intermediate, and expert). The suturing task was deconstructed into four distinct phases, and parameters within each phase were compared between novice and expert surgeons. RESULTS: The high accuracy of the developed model was indicated by a mean Dice similarity coefficient of 0.87. Deep learning-based parameters (procedural time, path distance, and normalized jerk index) exhibited correlations with traditional criteria-based rating scales and surgeons' years of experience. Experts completed the suturing task faster than novices. The total path distance for the right (dominant) side instrument movement was shorter for experts compared to novices. However, for the left (non-dominant) side, differences between the two groups were observed only in specific phases. The normalized jerk index for both the right and left sides was significantly lower in the expert than in the novice groups, and receiver operating characteristic analysis showed strong discriminative ability. CONCLUSION: The deep learning-based kinematic analytic approach for surgical instruments proves beneficial in assessing performance in microvascular anastomosis. Moreover, this methodology can be adapted for use in clinical settings.
• Acute effects of static and dynamic stretching for ankle plantar flexors on postural control during the single-leg standing task.

  Kensuke Oba, Naoto Kyotani, Minori Tanaka, Miho Komatsuzaki, Satoshi Kasahara, Katsuhiko Ogasawara, Mina Samukawa

  Sports biomechanics 1 - 11 2023年12月27日 

  Static stretching (SS) and dynamic stretching (DS) are widely used as warm-ups before sports. However, whether stretching affects postural control remains unclear. We compared the effects of SS and DS on the plantar flexors and postural control during single-leg standing. Fifteen healthy young participants performed SS, DS, or no stretching (control). The stretch condition consisted of four sets lasting 30 s each. The control condition was a rest with standing for 210 s. Center of pressure (COP) displacement was measured using a force plate before and after each intervention to assess postural control during the single-leg standing task. The COP area, COP velocity, and anteroposterior (COPAP) and mediolateral (COPML) range were calculated. DS significantly decreased in the COPML range (21.5 ± 4.1 to 19.0 ± 2.5 mm; P = 0.02), COP velocity (33.8 ± 7.6 to 29.8 ± 6.5 mm/s; P < 0.01), and COP area (498.6 ± 148.3 to 393.3 ± 101.1 mm2; P < 0.01), whereas SS did not change in the COP parameters (COP area 457.2 ± 108.3 to 477.8 ± 106.1 mm2, P = .49; COP velocity 31.2 ± 4.2 to 30.7 ± 5.8 mm/s, P = 0.60; COPAP 25.4 ± 3.1 to 25.3 ± 3.2 mm, P = 0.02; COPML 20.7 ± 3.3 to 21.1 ± 2.5 mm, P = 0.94). Therefore, DS of the plantar flexors enhances postural control during single-leg standing and may be effective for both injury prevention and performance enhancement.
• Optimal allocation of physicians improves accessibility and workload disparities in stroke care.

  Kazuki Ohashi, Toshiya Osanai, Kyohei Bando, Kensuke Fujiwara, Takumi Tanikawa, Yuji Tani, Soichiro Takamiya, Hirotaka Sato, Yasuhiro Morii, Tomoki Ishikawa, Katsuhiko Ogasawara

  International journal for equity in health 22 1 233 - 233 2023年11月07日 

  BACKGROUND: Inequalities in access to stroke care and the workload of physicians have been a challenge in recent times. This may be resolved by allocating physicians suitable for the expected demand. Therefore, this study analyzes whether reallocation using an optimization model reduces disparities in spatial access to healthcare and excessive workload. METHODS: This study targeted neuroendovascular specialists and primary stroke centers in Japan and employed an optimization model for reallocating neuroendovascular specialists to reduce the disparity in spatial accessibility to stroke treatment and workload for neuroendovascular specialists in Japan. A two-step floating catchment area method and an inverted two-step floating catchment area method were used to estimate the spatial accessibility and workload of neuroendovascular specialists as a potential crowdedness index. Quadratic programming has been proposed for the reallocation of neuroendovascular specialists. RESULTS: The reallocation of neuroendovascular specialists reduced the disparity in spatial accessibility and the potential crowdedness index. The standard deviation (SD) of the demand-weighted spatial accessibility index improved from 125.625 to 97.625. Simultaneously, the weighted median spatial accessibility index increased from 2.811 to 3.929. Additionally, the SD of the potential crowdedness index for estimating workload disparity decreased from 10,040.36 to 5934.275 after optimization. The sensitivity analysis also showed a similar trend of reducing disparities. CONCLUSIONS: The reallocation of neuroendovascular specialists reduced regional disparities in spatial accessibility to healthcare, potential crowdedness index, and disparities between facilities. Our findings contribute to planning health policies to realize equity throughout the healthcare system.
• 訪問看護サービスの空間的アクセシビリティに関する探索的研究

  大橋 和貴, 金 絢加, 佐藤 三穂, 鷲見 尚己, 谷川 琢海, 小笠原 克彦

  医療情報学連合大会論文集 43回 744 - 746 (一社)日本医療情報学会 2023年11月
• Access to mechanical thrombectomy and ischemic stroke mortality in Japan: a spatial ecological study

  Kazuki Ohashi, Toshiya Osanai, Kensuke Fujiwara, Takumi Tanikawa, Yuji Tani, Soichiro Takamiya, Hirotaka Sato, Yasuhiro Morii, Katsuhiko Ogasawara

  Frontiers in Neurology 14 2023年09月05日 

  Background Advances in stroke treatment have greatly improved outcomes; however, disparities in access to treatment might increase. Achieving equitable access to stroke treatment is a health policy challenge, as rapid treatment is essential for positive outcomes. This ecological cross-sectional study aimed to determine the relationship between the disparities in spatial accessibility to mechanical thrombectomy (SAMT) and stroke mortality rates in Japan, hypothesizing that disparities in SAMT may increase the differences in stroke mortality between regions. Methods We used the average number of ischemic stroke (IS) deaths between 2020 and 2021 as the response variable; and SAMT, medical resources, and socioeconomic characteristics of each municipality as explanatory variables. A conditional autoregressive model was used to examine the association between the risk of stroke mortality and SAMT. The standardized mortality ratio (SMR) was mapped to understand the nationwide disparities in stroke mortality risk. Results The median number of IS deaths was 17.5 persons per year in the municipalities (2020 to 2021). The study also found that municipalities with low SAMT were located in the northern part of Japan. The non-spatial regression model results indicated that poor accessibility, a small proportion of bachelor’s degrees or higher, and a high proportion of workers in secondary industries were related to high IS mortality. Three models were evaluated using spatial analysis; Model 1 with accessibility indicators alone, Model 2 with medical resources added to Model 1, and Model 3 with socioeconomic characteristics added to Model 2. In Models 1 and 2, the population-weighted spatial accessibility index (PWSAI) showed a significant negative relationship with stroke mortality. However, this was not evident in Model 3. Mapping using Model 3 showed that the high-risk areas were predominantly located in northern Japan, excluding Hokkaido. Conclusion Access to mechanical thrombectomy was estimated, and regional differences were observed. The relationship between accessibility and IS mortality is unknown; however, regardless of accessibility, municipalities with a high proportion of workers in secondary industries and a small proportion with bachelor’s degrees or above are at risk of death from stroke.
• Tissue Acceleration as a Novel Metric for Surgical Performance During Carotid Endarterectomy.

  Taku Sugiyama, Masaki Ito, Hiroyuki Sugimori, Minghui Tang, Toshitaka Nakamura, Katsuhiko Ogasawara, Hitoshi Matsuzawa, Naoki Nakayama, Sanju Lama, Garnette R Sutherland, Miki Fujimura

  Operative neurosurgery (Hagerstown, Md.) 2023年07月04日 

  BACKGROUND AND OBJECTIVES: Gentle tissue handling to avoid excessive motion of affected fragile vessels during surgical dissection is essential for both surgeon proficiency and patient safety during carotid endarterectomy (CEA). However, a void remains in the quantification of these aspects during surgery. The video-based measurement of tissue acceleration is presented as a novel metric for the objective assessment of surgical performance. This study aimed to evaluate whether such metrics correlate with both surgeons' skill proficiency and adverse events during CEA. METHODS: In a retrospective study including 117 patients who underwent CEA, acceleration of the carotid artery was measured during exposure through a video-based analysis. Tissue acceleration values and threshold violation error frequencies were analyzed and compared among the surgeon groups with different surgical experience (3 groups: novice, intermediate, and expert). Multiple patient-related variables, surgeon groups, and video-based surgical performance parameters were compared between the patients with and without adverse events during CEA. RESULTS: Eleven patients (9.4%) experienced adverse events after CEA, and the rate of adverse events significantly correlated with the surgeon group. The mean maximum tissue acceleration and number of errors during surgical tasks significantly decreased from novice, to intermediate, to expert surgeons, and stepwise discriminant analysis showed that the combined use of surgical performance factors could accurately discriminate between surgeon groups. The multivariate logistic regression analysis revealed that the number of errors and vulnerable carotid plaques were associated with adverse events. CONCLUSION: Tissue acceleration profiles can be a novel metric for the objective assessment of surgical performance and the prediction of adverse events during surgery. Thus, this concept can be introduced into futuristic computer-aided surgeries for both surgical education and patient safety.
• Regional disparity in the provision of rehabilitation services using the open data from the Japanese national claims database: an ecological study

  Yasuhiro Morii, Kagari Abiko, Tomoki Ishikawa, Kensuke Fujiwara, Keiko Konomura, Katsuhiko Ogasawara

  BMJ Open 13 6 e071670 - e071670 2023年06月20日 

  Objectives There are few reports on regional differences in the supply/utilisation balance and provision of rehabilitation services. This study analysed those regional differences in Japan to help policymakers provide more uniform and efficient rehabilitation services and optimally allocate related resources. Design An ecological study. Setting 47 prefectures and 9 regions in Japan in 2017. Primary and secondary outcome measures Primary measures were ‘supply/utilisation (S/U) ratio’, calculated by dividing rehabilitation supply converted to service units, by rehabilitation utilisation and ‘utilisation/expected utilisation (U/EU) ratio’, calculated by dividing utilisation by EU. The EU was defined as utilisation expected from the demography in each area. Data required to calculate these indicators were collected from open sources such as the National Database of Health Insurance Claims and Specific Health Checkups of Japan Open Data Japan. Results The S/U ratios were higher in Shikoku, Kyusyu, Tohoku and Hokuriku regions, and lower in Kanto and Tokai regions. The number of rehabilitation providers per population was higher mostly in the western part of Japan and lower mostly in the eastern part. The U/EU ratios were also higher mostly in the western part, and lower mostly in the eastern part such as Tohoku and Hokuriku regions. The same trend was seen for cerebrovascular disease and musculoskeletal disorder rehabilitation, which accounted for approximately 84% of rehabilitation services. For disuse syndrome rehabilitation, such a trend did not exist, and the U/EU ratio differed by prefectures. Conclusions The large surplus in rehabilitation supply in the western part was attributed to the greater number of providers, while the smaller surplus in Kanto and Tokai regions was due to the smaller amount of supply. The number of rehabilitation services used was lesser in the eastern part such as Tohoku and Hokuriku regions, indicating regional differences in the provision of rehabilitation services.
• Regional assessment of medical care provision system by principal component analysis.

  Kazuki Ohashi, Arisa Abe, Kensuke Fujiwara, Naoki Nishimoto, Katsuhiko Ogasawara

  Journal of family medicine and primary care 12 4 734 - 742 2023年04月 

  INTRODUCTION: The Japanese government has promoted policies ensuring standardized medical care across the secondary medical care areas (SMCAs); however, these efforts have not been evaluated, making the current conditions unclear. Multidimensional indicators could identify these differences; thus, this study examined the regional characteristics of the medical care provision system for 21 SMCAs in Hokkaido, Japan, and the changes from 1998 to 2018. MATERIALS AND METHODS: This study evaluated the characteristics of SMCAs by principal component analysis using multidimensional data related to the medical care provision system. Factor loadings and principal component scores were calculated, with the characteristics of each SMCA visually expressed using scatter plots. Additionally, data from 1998 to 2018 were analyzed to clarify the changes in SMCAs' characteristics. RESULTS: The primary and secondary principal components were Medical Resources and Geographical Factors, respectively. The Medical Resources components included the number of hospitals, clinics, and doctors, and an area's population of older adults, accounting for 65.28% of the total variance. The Geographical Factors components included the number of districts without doctors and the population and a land area of these districts, accounting for 23.20% of the variance. The accumulated proportion of variance was 88.47%. From 1998 to 2018, the area with the highest increase in Medical Resources was Sapporo, with numerous initial medical resources (-9.283 to -10.919). DISCUSSION: Principal component analysis summarized multidimensional indicators and evaluated SMCAs in this regional assessment. This study categorized SMCAs into four quadrants based on Medical Resources and Geographical Factors. Additionally, the difference in principal component scores between 1998 and 2018 emphasized the expanding gap in the medical care provision system among the 21 SMCAs.
• Cost-effectiveness of seven-days-per-week rehabilitation schedule for acute stroke patients.

  Yasuhiro Morii, Kagari Abiko, Toshiya Osanai, Jiro Takami, Takumi Tanikawa, Kensuke Fujiwara, Kiyohiro Houkin, Katsuhiko Ogasawara

  Cost effectiveness and resource allocation : C/E 21 1 12 - 12 2023年02月01日 

  BACKGROUND: Rehabilitation is an essential medical service for patients who have suffered acute stroke. Although the effectiveness of 7-days-per-week rehabilitation schedule has been studied in comparison with 5- or 6-days-per-week rehabilitation schedule, its cost-effectiveness has not been analyzed. In this research, to help formulate more cost-effective medical treatments for acute stroke patients, we analyzed the cost-effectiveness of 7-days-per-week rehabilitation for acute stroke from public health payer's perspective, and public healthcare and long-term care payer's perspective in Japan. METHODS: Cost-effectiveness of 7-days-per-week rehabilitation for acute stroke patients was analyzed based on the result from a previous study using a Japanese database examining the efficacy of 7-days-per-week rehabilitation. Cost utility analysis was conducted by comparing 7-days-per-week rehabilitation with 5- or 6-days-per-week rehabilitation, with its main outcome incremental cost-effectiveness ratio (ICER) calculated by dividing estimated incremental medical and long-term care costs by incremental quality-adjusted life years (QALY). The costs were estimated using the Japanese fee table and from published sources. The time horizon was 5 years, and Markov modeling was used for the analysis. RESULTS: The ICER was $6339/QALY from public health payer's perspective, lower than 5,000,000 Yen/QALY (approximately US$37,913), which was the willingness-to-pay used for the cost-effectiveness evaluation in Japan. The 7-day-per-week rehabilitation was dominant from public healthcare and long-term care payer's perspective. The result of sensitivity analysis confirmed the results. CONCLUSION: The results indicated that 7-days-per-week rehabilitation for acute stroke rehabilitation was likely to be cost-effective.
• Detecting inattentiveness caused by mind-wandering during a driving task: A behavioral study.

  Kazuki Yoshida, Daisuke Sawamura, Mikio Yagi, Yu Nakashima, Ryuji Saito, Nao Yamamura, Katsuhiko Ogasawara, Shinya Sakai

  Applied ergonomics 106 103892 - 103892 2023年01月 

  This study aims to investigate whether behavioral variability and participants' self-ratings can be used to detect mind-wandering while driving and to examine their effects on braking performance during a driving task. We created a novel driving task and added a sustained attention response task (SART). We examined the effects of mind-wandering on braking performance and whether mind-wandering could be detected from SART response variability. The within-subjects results showed that self-reports of inattentiveness during driving correlated significantly with SART response variability. Multiple regression analysis with brake reaction time as the dependent variable revealed a significant relationship between self-reports of inattentiveness and mind-wandering. However, there were no other consistent linear associations between mind-wandering and SART response variability. Our results not only suggest that inattentiveness to driving caused by mind-wandering impairs braking performance but also emphasize the importance and difficulty of detecting this state from behavioral data alone.
• Assessment of the Efficiency of Non-Invasive Diagnostic Imaging Modalities for Detecting Myocardial Ischemia in Patients Suspected of Having Stable Angina.

  Kunihiro Iwata, Katsuhiko Ogasawara

  Healthcare (Basel, Switzerland) 11 1 2022年12月22日 

  This study aimed to assess and compare the efficiency of non-invasive imaging modalities in detecting myocardial ischemia in patients with suspected stable angina as easy-to-understand indices. Our study included 1000 patients with chest pain and possible stable myocardial ischemia. The modalities to be assessed were cardiac magnetic resonance imaging (CMRI), single-photon emission computed tomography, positron emission computed tomography (PET), stress echocardiography, and fractional flow reserve derived from coronary computed tomography angiography (FFRCT). As a simulation study, we assumed that all five imaging modalities were performed on these patients, and a decision tree analysis was conducted. From the results, the following efficiencies were assessed and compared: (1) number of true positive (TP), false positive (FP), false negative (FN), and true negative (TN) test results; (2) positive predictive value (PPV); (3) negative predictive value (NPV); (4) post-test probability; (5) diagnostic accuracy (DA); and (6) number needed to diagnose (NND). In the basic settings (pre-test probability: 30%), PET generated the highest TP (267) and NPV (95%, 95% confidence interval (CI): 93-96%). In contrast, CMRI produced the highest TN (616), PPV (76%, 95% CI: 71-80%), and DA (88%, 95% CI: 86-90%) and the lowest NND (1.33, 95% CI: 1.24-1.47). Although FFRCT generated the highest TP (267) and lowest FN (33), it generated the highest FP (168). In terms of detecting myocardial ischemia, compared with the other modalities, PET and CMRI were more efficient. The results of our study might be helpful for both patients and medical professionals associated with their examination.
• Validation of the Japanese version of the Body Image Scale for bladder cancer patients.

  Miho Sato, Takahiro Osawa, Takashige Abe, Michitaka Honda, Madoka Higuchi, Shuhei Yamada, Jun Furumido, Hiroshi Kikuchi, Ryuji Matsumoto, Yasuyuki Sato, Yoshihiro Sasaki, Toru Harabayashi, Satoru Maruyama, Norikata Takada, Keita Minami, Hiroshi Tanaka, Ken Morita, Akira Kashiwagi, Sachiyo Murai, Yoichi M Ito, Katsuhiko Ogasawara, Nobuo Shinohara

  Scientific reports 12 1 21544 - 21544 2022年12月13日 

  The Body Image Scale (BIS) is a 10-item tool that measures the body images of cancer patients. This study aims to validate the Japanese version of the BIS for bladder cancer patients. A multicenter cross-sectional survey was used to identify the participants, which included Japanese bladder cancer patients. The percentage of missing responses, internal consistency, and known-group validity were evaluated. The correlations between the BIS and two HRQOL instruments (the Bladder Cancer Index and the SF-12) were assessed to determine convergent validity. Among 397 patients, 221 patients were treated by transurethral resection of bladder tumor (TURBT) endoscopically, 49 patients underwent cystectomy with neobladder, and 127 patients underwent cystectomy involving stoma. The percentage of missing responses in the BIS ranged from 8.1 to 15.6%. Cronbach's α coefficient was 0.924. Higher BIS scores indicate negative body image, and the median BIS score for patients with native bladders after TURBT (0.5) was significantly lower than those of the patients with neobladder (4.0) and stoma formation (7.0), which indicated the discriminatory ability of the BIS. Each domain of the Bladder Cancer Index and the role summary score of the SF-12 correlated to the BIS scores, which confirmed the convergent validity. A range of BIS scores were identified among patients who reported similar physical summary scores and mental summary scores of the SF-12. This study confirmed the reliability and validity of the Japanese version of the BIS for bladder cancer patients.
• COVID-19-related stress, exercise, and oral health-related quality of life among community-dwelling older adults who participated in the CHEER Iwamizawa project, Japan.

  Kazuhito Miura, Yutaka Watanabe, Haruhisa Baba, Kimiya Ozaki, Takae Matsushita, Miyako Kondoh, Kazutaka Okada, Shinji Nakaoka, Katsuhiko Ogasawara, Teppei Suzuki, Hiroshi Saito, Takashi Kimura, Akiko Tamakoshi, Yutaka Yamazaki

  Scientific reports 12 1 20347 - 20347 2022年11月27日 

  This study examined the association between coronavirus disease 2019 (COVID-19)-related stress, exercise habits, and oral health-related quality of life (OHRQoL) in a sample of 215 community-dwelling older adults in Japan (57 men, 158 women; Mage = 74.2 years, SD = 6.0). Data were collected during wellness checkups in October 2020 and included participants' demographic characteristics, measures of instrumental activities of daily living and depressive tendencies, number of teeth, oral hypofunction, OHRQoL, COVID-19-related stress, and exercise habits. Four mutually exclusive groups were created, using the presence or absence of COVID-19-related stress and lack of exercise habits as risk factors for poor OHRQoL (no COVID-19-related stress and no lack of exercise, COVID-19-related stress only, lack of exercise habits only, and both COVID-19-related stress and lack of exercise habits). Poisson regression with robust standard errors provided the prevalence ratio for poor OHRQoL. The presence of both COVID-19-related stress and lack of exercise habits (adjusted prevalence ratio: 2.20, 95% CI: 1.31- 3.69) was associated with poor OHRQoL. The results indicate that COVID-19-related stress and exercise habits should be considered when designing oral health and public health initiatives.
• Extraction and Quantification of Words Representing Degrees of Diseases: Combining the Fuzzy C-Means Method and Gaussian Membership.

  Feng Han, ZiHeng Zhang, Hongjian Zhang, Jun Nakaya, Kohsuke Kudo, Katsuhiko Ogasawara

  JMIR formative research 6 11 e38677  2022年11月18日 

  BACKGROUND: Due to the development of medical data, a large amount of clinical data has been generated. These unstructured data contain substantial information. Extracting useful knowledge from this data and making scientific decisions for diagnosing and treating diseases have become increasingly necessary. Unstructured data, such as in the Marketplace for Medical Information in Intensive Care III (MIMIC-III) data set, contain several ambiguous words that demonstrate the subjectivity of doctors, such as descriptions of patient symptoms. These data could be used to further improve the accuracy of medical diagnostic system assessments. To the best of our knowledge, there is currently no method for extracting subjective words that express the extent of these symptoms (hereinafter, "degree words"). OBJECTIVE: Therefore, we propose using the fuzzy c-means (FCM) method and Gaussian membership to quantify the degree words in the clinical medical data set MIMIC-III. METHODS: First, we preprocessed the 381,091 radiology reports collected in MIMIC-III, and then we used the FCM method to extract degree words from unstructured text. Thereafter, we used the Gaussian membership method to quantify the extracted degree words, which transform the fuzzy words extracted from the medical text into computer-recognizable numbers. RESULTS: The results showed that the digitization of ambiguous words in medical texts is feasible. The words representing each degree of each disease had a range of corresponding values. Examples of membership medians were 2.971 (atelectasis), 3.121 (pneumonia), 2.899 (pneumothorax), 3.051 (pulmonary edema), and 2.435 (pulmonary embolus). Additionally, all extracted words contained the same subjective words (low, high, etc), which allows for an objective evaluation method. Furthermore, we will verify the specific impact of the quantification results of ambiguous words such as symptom words and degree words on the use of medical texts in subsequent studies. These same ambiguous words may be used as a new set of feature values to represent the disorders. CONCLUSIONS: This study proposes an innovative method for handling subjective words. We used the FCM method to extract the subjective degree words in the English-interpreted report of the MIMIC-III and then used the Gaussian functions to quantify the subjective degree words. In this method, words containing subjectivity in unstructured texts can be automatically processed and transformed into numerical ranges by digital processing. It was concluded that the digitization of ambiguous words in medical texts is feasible.
• Spatial-temporal analysis of cerebral infarction mortality in Hokkaido, Japan: an ecological study using a conditional autoregressive model.

  Kazuki Ohashi, Toshiya Osanai, Kensuke Fujiwara, Takumi Tanikawa, Yuji Tani, Soichiro Takamiya, Hirotaka Sato, Yasuhiro Morii, Kyohei Bando, Katsuhiko Ogasawara

  International journal of health geographics 21 1 16 - 16 2022年10月31日 

  BACKGROUND: Accessibility to stroke treatments is a challenge that depends on the place of residence. However, recent advances in medical technology have improved health outcomes. Nevertheless, the geographic heterogeneity of medical resources may increase regional disparities. Therefore, evaluating spatial and temporal influences of the medical system on regional outcomes and advanced treatment of cerebral infarction are important from a health policy perspective. This spatial and temporal study aims to identify factors associated with mortality and to clarify regional disparities in cerebral infarction mortality at municipality level. METHODS: This ecological study used public data between 2010 and 2020 from municipalities in Hokkaido, Japan. We applied spatial and temporal condition autoregression analysis in a Bayesian setting, with inference based on the Markov chain Monte Carlo simulation. The response variable was the number of deaths due to cerebral infarction (ICD-10 code: I63). The explanatory variables were healthcare accessibility and socioeconomic status. RESULTS: The large number of emergency hospitals per 10,000 people (relative risk (RR) = 0.906, credible interval (Cr) = 0.861 to 0.954) was associated with low mortality. On the other hand, the large number of general hospitals per 10,000 people (RR = 1.123, Cr = 1.068 to 1.178) and longer distance to primary stroke centers (RR = 1.064, Cr = 1.014 to 1.110) were associated with high mortality. The standardized mortality ratio decreased from 2010 to 2020 in Hokkaido by approximately 44%. Regional disparity in mortality remained at the same level from 2010 to 2015, after which it narrowed by approximately 5% to 2020. After mapping, we identified municipalities with high mortality rates that emerged in Hokkaido's central and northeastern parts. CONCLUSION: Cerebral infarction mortality rates and the disparity in Hokkaido improved during the study period (2010-2020). This study emphasized that healthcare accessibility through places such as emergency hospitals and primary stroke centers was important in determining cerebral infarction mortality at the municipality level. In addition, this study identified municipalities with high mortality rates that require healthcare policy changes. The impact of socioeconomic factors on stroke is a global challenge, and improving access to healthcare may reduce disparities in outcomes.
• Effects of colour narrative in community-dwelling older adults: A mixed methods study.

  Risa Takashima, Takao Inoue, Yuko Yoshida, Mari Sakaue, Teppei Suzuki, Katsuhiko Ogasawara

  Scandinavian journal of occupational therapy 29 7 542 - 554 2022年10月 [査読有り]
   

  BACKGROUND: Based on occupational storytelling/story-making, this study developed Colour Narrative, a program to promote the health and well-being of community-dwelling older adults. OBJECTIVES: To conduct a pilot study to implement Colour Narrative in a heavy snowfall area of Japan and verify the participants' experiences in the program and its effectiveness. MATERIAL AND METHODS: An advanced mixed methods design was used. The participants were 22 members of a community-based social group for older adults. Quantitative measurements of life functions and health-related quality of life (HRQOL) were conducted before and after the intervention. Qualitative data were collected from focus group interviews regarding the participants' experiences during the intervention process. Lastly, both datasets were integrated. RESULTS: The harsh living conditions due to heavy snowfall reduced the participants' overall activity. In this environment, Colour Narrative encouraged them to control their lives more in their own ways and enhanced their HRQOL. The core of their experiences was 'negotiating occupations'. This negotiation was a highly intellectual task that significantly improved their cognitive function. CONCLUSIONS: The structure and content of Colour Narrative were found to be useful and feasible for community-dwelling older adults. SIGNIFICANCE: Colour Narrative offers a new occupation-based intervention strategy for preventive occupational therapy.
• Potential crowdedness of mechanical thrombectomy and cerebral infarction mortality in Japan: Application of inverted two-step floating catchment area method.

  Kazuki Ohashi, Kensuke Fujiwara, Toshiya Osanai, Takumi Tanikawa, Kyohei Bando, Shojiro Yamasaki, Tomohiro Aoki, Songzi Gu, Katsuhiko Ogasawara

  Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association 31 9 106625 - 106625 2022年09月 

  OBJECTIVES: This study aimed to evaluate a stroke medical delivery system based on population coverage and the potential crowdedness index (PCI) of mechanical thrombectomy and investigate the relationship between PCI and cerebral infarction mortality in Japan. MATERIALS AND METHODS: This cross-sectional study defined 662 facilities and 1605 neurointerventionalists as supply, population aged 55 years or older as demand, and set the reachable area for demand as 120 min in driving time. Multiple regression analysis adjusted for spatial autocorrelation was used to examine the relationship between PCI and cerebral infarction mortality. RESULTS: In the 2020 data, 99% of the population aged 55 years or older had access to mechanical thrombectomy (≤120 min), and the PCI ranged from 5876 to 129838, with a median of 30426. From 2020 to 2035, the PCI is estimated to increase (30426 to 32510), decreasing after 2035 (32510 to 29469). The PCI distribution exhibited geographical heterogeneity. High PCI values emerged in eastern Japan. According to regression analysis, the increase in PCI by 1% led to an increase of 0.13% in standardized mortality ratio of cerebral infarction in men. However, PCI did not significantly correlate with cerebral infarction mortality in women. CONCLUSIONS: PCI for hospitals based on supply and demand was geographically heterogeneous in Japan. Optimization of PCI contributes equalization of mechanical thrombectomy provision system and may improve cerebral infarction mortality.
• Measuring the Inequalities in the Distribution of Public Healthcare Resources by the HRDI (Health Resources Density Index): Data Analysis from 2010 to 2019.

  Jieyu Zhao, Yuchen Yang, Katsuhiko Ogasawara

  Healthcare (Basel, Switzerland) 10 8 2022年07月27日 

  BACKGROUND: In China, a developing country, the imbalance of development exists in different fields, and the inequalities in the distribution of healthcare services have garnered increasing attention. This study aimed to assess the healthcare services allocation and compare the latest distribution ratios of the essential healthcare indicators with the national requirement values announced by the government to research the level of healthcare development in China. METHODS: Data were extracted from the Chinese Statistical Yearbook (2010-2019). The Healthcare Resource Density Index (HRDI) was used to evaluate equity in the demographic and geographical dimensions. The requirement values related to the ratio of doctors, nurses, and institution beds per thousand people were drawn from government documents. The data of healthcare serviceability indicators were compared with those requirements to check the situation of each province's medical development. RESULTS: From 2010 to 2018, there was a sustainable upward trend in government investment, however, a noticeable drop in the investment in northeast areas was seen. Although the HRDI of the institutions, beds, doctors, and nurses experienced some small fluctuations over the years, the developing areas in the middle-west areas had almost approached the level of developed east areas. There were only four provinces that met the requirements of the government in all three indicators (the ratio of institution beds, doctors, and nurses per thousand people). CONCLUSION: The equality of the distribution of healthcare services in China was unfair between the eastern and middle-western areas. The government launched the developing requirements and paid additional attention to narrowing the imbalance among different economic level regions to meet the needs of the local people. Although many provinces did not meet the requirements for medical resources in 2019, the distribution of healthcare services was approached relatively equitably countrywide.
• Analysis of Factors Hindering the Dissemination of Medical Information Standards.

  Masami Mukai, Katsuhiko Ogasawara

  Healthcare (Basel, Switzerland) 10 7 2022年07月04日 

  Many medical information standards are not widely used in Japan, and this hinders the promotion of the use of real-world data. However, the complex intertwining of many factors hindering the dissemination of medical information standards makes it difficult to solve this problem. This study analyzed and visualized relationships among factors that inhibit the dissemination of medical information standards. Five medical informatics experts affiliated with universities and hospitals were interviewed about the factors that hinder the dissemination of medical information standards in Japan. The presented factors were analyzed using the interpretive structural modeling (ISM) method and the decision-making trial and evaluation laboratory (DEMATEL) method. We found that "legislation" and "reliability" were important inhibiting factors for the dissemination of medical information standards in Japan. We also found a six-layered structure in which "reliability" was satisfied when "legislation" was in place and "expectations" and "personal information" were resolved. The DEMATEL analysis indicated the relationships and classifications of factors hindering the dissemination of medical information standards. Since the adoption of medical information standards does not directly lead to revenue for medical institutions, it is possible to meet the "expectation" of improving the quality of medical care by ensuring "legislation" and "reliability", that is, ensuring the dependability of medical treatment. The results of this study visually show the structure of the factors and will help solve the problems that hinder the effective and efficient spread of standards. Solving these problems may support the efficient use of real-world data.
• DPC(Diagnosis Procedure Combination/Per-Diem Payment System)データを用いた腹腔鏡下膀胱全摘除術における周術期合併症治療費用の分析

  森井 康博, 原林 透, 大澤 崇宏, 谷川 琢海, 山品 博子, 篠原 信雄, 小笠原 克彦

  泌尿器外科 35 6 516 - 521 医学図書出版(株) 2022年06月 

  北海道がんセンターで腹腔鏡下膀胱全摘除術を受けた48名を対象として、症例のDPCデータより合併症治療費用をClavien-Dindo分類に基づいて症状・重症度別に推計した。1症例あたり合併症治療費用は11万円(四分位範囲:0〜32万円)であり、総費用(257万円)の4.3%を占めた。また、Clavien-Dindo分類でGrade III以上、および再入院を伴う合併症には大きな費用が発生していた。本結果より、合併症治療費用は重症度や再入院の有無により大きく異なることが示された。(著者抄録)
• Differences in spatial patterns of long-term care depending on severity in Hokkaido, Japan.

  Kazuki Ohashi, Kensuke Fujiwara, Takumi Tanikawa, Kyohei Bando, Tomohiro Aoki, Katsuhiko Ogasawara

  Geospatial health 17 1 2022年05月16日 

  The increasing demand for long-term care (LTC) among the ageing population is a serious problem worldwide, which has greatly increased also in Japan since the introduction of the LTC insurance system there. Since there is a difference between insurers with respect to the proportion of people needing LTC, this study aimed at clarifying the spatial patterns of LTC. Insurer (n=156) LTC data for the period 2012-2019 were obtained from Ministry of Health, Labour, and Welfare and those needing LTC were classified into three classes: total, mild and severe with ageand sex-adjusted proportions needing LTC. Global and local Moran’s I statistics were calculated for each 2-year period to clarify the trends of global and local spatial clusters. From 2012 to 2019, the mean proportion of mild class cases increased (10.6% to 11.6%), whereas that of severe class cases decreased slightly (5.9% to 5.7%). The spatial pattern of the proportion of each class revealed positive spatial autocorrelation. Based on analysis by local Moran’s I, differences in spatial patterns were emphasised between the mild and severe classes. In Hokkaido, High-High clusters of mild cases were identified in the central and southern parts and severe ones in the northern and southern parts. Spatial patterns differed depending on the LTC class. Some insurers had distinctly higher or lower certification rates than those of their neighbourhoods.
• Acceptance of the Use of Artificial Intelligence in Medicine Among Japan's Doctors and the Public: A Questionnaire Survey.

  Honoka Tamori, Hiroko Yamashina, Masami Mukai, Yasuhiro Morii, Teppei Suzuki, Katsuhiko Ogasawara

  JMIR human factors 9 1 e24680  2022年03月16日 

  BACKGROUND: The use of artificial intelligence (AI) in the medical industry promises many benefits, so AI has been introduced to medical practice primarily in developed countries. In Japan, the government is preparing for the rollout of AI in the medical industry. This rollout depends on doctors and the public accepting the technology. Therefore it is necessary to consider acceptance among doctors and among the public. However, little is known about the acceptance of AI in medicine in Japan. OBJECTIVE: This study aimed to obtain detailed data on the acceptance of AI in medicine by comparing the acceptance among Japanese doctors with that among the Japanese public. METHODS: We conducted an online survey, and the responses of doctors and members of the public were compared. AI in medicine was defined as the use of AI to determine diagnosis and treatment without requiring a doctor. A questionnaire was prepared referred to as the unified theory of acceptance and use of technology, a model of behavior toward new technologies. It comprises 20 items, and each item was rated on a five-point scale. Using this questionnaire, we conducted an online survey in 2018 among 399 doctors and 600 members of the public. The sample-wide responses were analyzed, and then the responses of the doctors were compared with those of the public using t tests. RESULTS: Regarding the sample-wide responses (N=999), 653 (65.4%) of the respondents believed, in the future, AI in medicine would be necessary, whereas only 447 (44.7%) expressed an intention to use AI-driven medicine. Additionally, 730 (73.1%) believed that regulatory legislation was necessary, and 734 (73.5%) were concerned about where accountability lies. Regarding the comparison between doctors and the public, doctors (mean 3.43, SD 1.00) were more likely than members of the public (mean 3.23, SD 0.92) to express intention to use AI-driven medicine (P<.001), suggesting that optimism about AI in medicine is greater among doctors compared to the public. CONCLUSIONS: Many of the respondents were optimistic about the role of AI in medicine. However, when asked whether they would like to use AI-driven medicine, they tended to give a negative response. This trend suggests that concerns about the lack of regulation and about accountability hindered acceptance. Additionally, the results revealed that doctors were more enthusiastic than members of the public regarding AI-driven medicine. For the successful implementation of AI in medicine, it would be necessary to inform the public and doctors about the relevant laws and to take measures to remove their concerns about them.
• Development of a Model for the Spread of Nosocomial Infection Outbreaks Using COVID-19 Data.

  Ryuichiro Ueda, Ayato Goto, Ryuki Kita, Katsuhiko Ogasawara

  Healthcare (Basel, Switzerland) 10 3 2022年03月03日 

  We constructed and validated a mathematical model of infectious diseases to simulate the impact of COVID-19 nosocomial infection outbreaks outside hospitals. The model was constructed with two populations, one inside the hospital and one outside the hospital, and a population diffusion rate k (0 ≤ k ≤ 1) was set as a parameter to simulate the flow of people inside the hospital to outside the hospital. To validate the model, we divided the values of the population diffusion rate k into k = 0-0.25, 0.25-0.50, 0.50-0.75, and 0.75-1.0, and the initial value at the beginning of the simulation was set as day 1. The number of infected people was calculated for a 60-day period. The change in the number of people infected outside the hospital due to the out-break of nosocomial infection was calculated. As a result of the simulation, the number of people infected outside the hospital increased as the population diffusion rate k increased from 0.50 to 0.75, but the number of people infected from 0.75 to 1.0 was almost the same as that from 0 to 0.25, with the peak day being earlier. In future, it will be necessary to examine epidemiological information that has a large impact on the results.
• Oral frailty and carriage of oral Candida in community-dwelling older adults (Check-up to discover Health with Energy for senior Residents in Iwamizawa; CHEER Iwamizawa).

  Haruhisa Baba, Yutaka Watanabe, Kazuhito Miura, Kimiya Ozaki, Takae Matsushita, Miyako Kondoh, Kazutaka Okada, Akira Hasebe, Tokiyoshi Ayabe, Kiminori Nakamura, Shinji Nakaoka, Katsuhiko Ogasawara, Teppei Suzuki, Hiroshi Saito, Takashi Kimura, Akiko Tamakoshi, Yutaka Yamazaki

  Gerodontology 39 1 49 - 58 2022年03月 

  OBJECTIVE: To examine the association between oral frailty and oral Candida carriage as a general indicator of deteriorating oral function in older adults. BACKGROUND: Older adults exhibit an elevated risk of oral candidiasis caused by Candida. Although many studies have identified factors associated with oral Candida carriage, none have evaluated its relationship with oral function. MATERIALS AND METHODS: This study included 210 community-dwelling older adults aged ≥60 years who participated in wellness checks. Fungal flora expression in saliva samples was evaluated to identify oral C. albicans and C. glabrata. Participants were categorised by detection of neither strain (group 1), either one of the strains (group 2), or both strains (group 3). The relationship between oral Candida carriage and oral frailty was evaluated by multinomial logistic regression analysis. RESULTS: The participants included 58 men and 152 women with a mean age of 74.2 ± 6.1 years. A total of 88 (41.9%), 94 (44.8%) and 28 (13.3%) participants were assigned to groups 1, 2 and 3 respectively. In the multinomial logistic regression analysis, significant associations were observed between group 1 and group 2 for "Have you choked on your tea or soup recently?" and the number of applicable oral frailty items. Between group 1 and group 3, significant associations were observed for the number of remaining teeth, masticatory performance and the number of applicable oral frailty items. CONCLUSION: We obtained basic data useful for intervention studies aimed at verifying whether oral function management prevents deterioration of the oral bacterial flora.
• 病院経営に係るリカレント教育の現状調査─北海道大学における病院経営アドミニストレータ育成プログラムを通じて─

  青木智大, 森井康博, 椎名希美, 石川智基, 鈴木哲平, 藤原健祐, 谷祐児, 小笠原克彦

  高等教育ジャーナル─高等教育と生涯学習─ 29 2022年03月 [査読有り][通常論文]
  
• Examining the Effect of the Ratio of Biomedical Domain to General Domain Data in Corpus in Biomedical Literature Mining

  Ziheng Zhang, Feng Han, Hongjian Zhang, Tomohiro Aoki, Katsuhiko Ogasawara

  Applied Sciences 12 1 154 - 154 2021年12月24日 

  Biomedical terms extracted using Word2vec, the most popular word embedding model in recent years, serve as the foundation for various natural language processing (NLP) applications, such as biomedical information retrieval, relation extraction, and recommendation systems. The objective of this study is to examine how changes in the ratio of the biomedical domain to general domain data in the corpus affect the extraction of similar biomedical terms using Word2vec. We downloaded abstracts of 214,892 articles from PubMed Central (PMC) and the 3.9 GB Billion Word (BW) benchmark corpus from the computer science community. The datasets were preprocessed and grouped into 11 corpora based on the ratio of BW to PMC, ranging from 0:10 to 10:0, and then Word2vec models were trained on these corpora. The cosine similarities between the biomedical terms obtained from the Word2vec models were then compared in each model. The results indicated that the models trained with both BW and PMC data outperformed the model trained only with medical data. The similarity between the biomedical terms extracted by the Word2vec model increased when the ratio of the biomedical domain to general domain data was 3:7 to 5:5. This study allows NLP researchers to apply Word2vec based on more information and increase the similarity of extracted biomedical terms to improve their effectiveness in NLP applications, such as biomedical information extraction.
• Developing a RadLex-Based Named Entity Recognition Tool for Mining Textual Radiology Reports: Development and Performance Evaluation Study.

  Shintaro Tsuji, Andrew Wen, Naoki Takahashi, Hongjian Zhang, Katsuhiko Ogasawara, Gouqian Jiang

  Journal of medical Internet research 23 10 e25378  2021年10月29日 

  BACKGROUND: Named entity recognition (NER) plays an important role in extracting the features of descriptions such as the name and location of a disease for mining free-text radiology reports. However, the performance of existing NER tools is limited because the number of entities that can be extracted depends on the dictionary lookup. In particular, the recognition of compound terms is very complicated because of the variety of patterns. OBJECTIVE: The aim of this study is to develop and evaluate an NER tool concerned with compound terms using RadLex for mining free-text radiology reports. METHODS: We leveraged the clinical Text Analysis and Knowledge Extraction System (cTAKES) to develop customized pipelines using both RadLex and SentiWordNet (a general purpose dictionary). We manually annotated 400 radiology reports for compound terms in noun phrases and used them as the gold standard for performance evaluation (precision, recall, and F-measure). In addition, we created a compound terms-enhanced dictionary (CtED) by analyzing false negatives and false positives and applied it to another 100 radiology reports for validation. We also evaluated the stem terms of compound terms by defining two measures: occurrence ratio (OR) and matching ratio (MR). RESULTS: The F-measure of cTAKES+RadLex+general purpose dictionary was 30.9% (precision 73.3% and recall 19.6%) and that of the combined CtED was 63.1% (precision 82.8% and recall 51%). The OR indicated that the stem terms of effusion, node, tube, and disease were used frequently, but it still lacks capturing compound terms. The MR showed that 71.85% (9411/13,098) of the stem terms matched with that of the ontologies, and RadLex improved approximately 22% of the MR from the cTAKES default dictionary. The OR and MR revealed that the characteristics of stem terms would have the potential to help generate synonymous phrases using the ontologies. CONCLUSIONS: We developed a RadLex-based customized pipeline for parsing radiology reports and demonstrated that CtED and stem term analysis has the potential to improve dictionary-based NER performance with regard to expanding vocabularies.
• Cost-effectiveness analysis using lifetime attributable risk of proton beam therapy for pediatric medulloblastoma in Japan.

  Takaaki Yoshimura, Honoka Tamori, Yasuhiro Morii, Takayuki Hashimoto, Shinichi Shimizu, Katsuhiko Ogasawara

  Journal of radiation research 2021年09月29日 [査読有り]
   

  Compared to conventional X-ray therapy, proton beam therapy (PBT) has more clinical and physical advantages such as irradiation dose reduction to normal tissues for pediatric medulloblastoma. However, PBT is expensive. We aimed to compare the cost-effectiveness of PBT for pediatric medulloblastoma with that of conventional X-ray therapy, while focusing on radiation-induced secondary cancers, which are rare, serious and negatively affect a patient's quality of life (QOL). Based on a systematic review, a decision tree model was used for the cost-effectiveness analysis. This analysis was performed from the perspective of health care payers; the cost was estimated from medical fees. The target population was pediatric patients with medulloblastoma below 14 years old. The time horizon was set at 7.7 years after medulloblastoma treatment. The primary outcome was the incremental cost-effectiveness ratio (ICER), which was defined as the ratio of the difference in cost and lifetime attributable risk (LAR) between conventional X-ray therapy and PBT. The discount rate was set at 2% annually. Sensitivity analyses were performed to model uncertainty. Cost and LAR in conventional X-ray therapy and PBT were Japanese yen (JPY) 1 067 608 and JPY 2436061 and 42% and 7%, respectively. The ICER was JPY 3856398/LAR. In conclusion, PBT is more cost-effective than conventional X-ray therapy in reducing the risk of radiation-induced secondary cancers in pediatric medulloblastoma. Thus, our constructed ICER using LAR is one of the valid indicators for cost-effectiveness analysis in radiation-induced secondary cancer.
• Analyzing Cost-Effectiveness of Allocating Neurointerventionist for Drive and Retrieve System for Patients with Acute Ischemic Stroke.

  Yasuhiro Morii, Toshiya Osanai, Kensuke Fujiwara, Takumi Tanikawa, Kiyohiro Houkin, Songzi Gu, Katsuhiko Ogasawara

  Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association 30 8 105843 - 105843 2021年08月 

  OBJECTIVES: There are regional disparities in implementation rates of endovascular thrombectomy due to time and resource constraints such as endovascular thrombectomy specialists. In Hokkaido, Japan, Drive and Retrieve System (DRS), where endovascular thrombectomy specialists perform early endovascular thrombectomies by traveling from the facilities where they normally work to facilities closer to the patient. This study analyzed the cost-effectiveness of allocating a endovascular thrombectomy specialist for DRS to treat stroke patients. MATERIALS AND METHODS: he number of ischemic stroke patients expected to receive endovascular thrombectomy in Hokkaido in 2015 was estimated. It was assumed that an additional neutointerventionist was allocated for DRS. The analysis was performed from the government's perspective, which includes medical and nursing-care costs, and the personnel cost for endovascular thrombectomy specialist. The analysis was conducted comparing the current scenario, where patients received endovascular thrombectomy in facilities where endovascular thrombectomy specialists normally work, with the scenario with DRS within 60 min drive distance. Patient transport time was analyzed using geographic information system, and patient severity was estimated from the transport time. The primary outcome was incremental cost-effectiveness ratio (ICER) in each medical area which was calculated from the incremental costs and the incremental quality-adjusted life years (QALYs), estimated from patient severity using published literature. The entire process was repeated 100 times. RESULTS: DRS was most cost-effective in Kamikawachubu area, where the ICER was $14,173±16,802/QALY, significantly lower than the threshold that the Japanese guideline suggested. CONCLUSIONS: Since DRS was cost-effective in Kamikawachubu area, the area should be prioritized when a endovascular thrombectomy specialist for DRS is allocated as a policy.
• The Effects of Static Stretching On Dynamic Postural Control During Maximum Forward Leaning Task.

  Kensuke Oba, Moeka Ohta, Hiroki Mani, Teppei Suzuki, Katsuhiko Ogasawara, Mina Samukawa

  Journal of motor behavior 1 - 9 2021年06月21日 

  The purpose of this study was to determine how the application of static stretching to ankle plantar flexors affects postural control during maximum forward leaning. Twenty-six volunteer males (age 21.4 ± 1.2 years) were randomly assigned to stretching and control conditions. Participants conducted 5-min stretching on a stretch board for the stretching condition and were kept standing for 6-min for the control condition. Before and after intervention, the range of motion (ROM) at ankle dorsiflexion and the center of pressure (COP) excursion during maximal forward leaning were determined. Mean anteroposterior COP position, COP velocity and COP areas were calculated to compare the change in postural control. After stretching, ROM was significantly increased. During maximal forward leaning after stretching, both COP position and velocity showed significant increases compared to before stretching. Moreover, COP position and velocity in the stretching condition were significantly higher than in the control condition after stretching. No significant differences were found in COP area before and after stretching. Five-minute stretching increased not only ROM but also the anterior limit of stability while maintaining posture and led to faster COP shift than before stretching. These results indicate that static stretching would improve dynamic postural control as well.
• 【COVID-19が流行しない社会を目指す-社会医学・環境衛生学の視点から】環境健康科学の立場からその研究と教育の現状と課題

  荒木 敦子, 宮下 ちひろ, 岸 玲子, 小笠原 克彦

  公衆衛生 85 6 400 - 407 (株)医学書院 2021年06月 

  ＜文献概要＞ポイント ◆北海道大学環境健康科学研究教育センターは,「環境と健康」分野の研究・教育に取り組んでいる全学共同教育研究施設である.◆大規模な環境疫学研究として,出生コーホートや室内環境と健康に関する研究により,環境化学物質による健康影響について多くの成果を報告している.◆環境と健康は学際的な領域であり,多様な専門性を持つ人材の育成と協力が不可欠である.
• Analysis of Factors Inhibiting the Dissemination of Telemedicine in Japan: Using the Interpretive Structural Modeling.

  Hiroki Shimizu, Takumi Tanikawa, Hiro Mizuguchi, Yuji Tani, Katsuhiko Ogasawara

  Telemedicine journal and e-health : the official journal of the American Telemedicine Association 27 5 575 - 582 2021年05月 

  Background: Telemedicine is not significantly spreading globally and large variations in its availability and use exist internationally. Although many factors already inhibit the dissemination of telemedicine, its complexly intertwined factors make it more difficult to solve this problem. This study aimed to analyze and visualize relationships among factors inhibiting the dissemination of telemedicine. We applied the interpretive structural modeling method and cross-impact matrix multiplication applied to classification analysis. Materials and Methods: Factors inhibiting the dissemination of telemedicine in Japan were extracted by literature review and hearing from four medical informatics experts belonging to a university or hospital using the Kawakita Jiro method. Results: Eighteen factors were extracted as those inhibiting the dissemination of telemedicine service in Japan: initial and operation cost, research data, legal development, profitability, usability, human resources, image quality, network speed, information security, technical limitation, restriction for clinical practice, practice continuity, target use case, burden for physicians, respondence, risks for clinical safety, understanding of medical staff, and understanding of patients. The hierarchical structure chart showed a nine-level structure and the cross-impact matrix showed the relationship among factors and the classification of them inhibiting the dissemination of telemedicine. Discussion: We found that the underlying factors were high implementation and operation costs, low research data, and risks for clinical safety. Implementation and operation costs, research data, legal development, and profitability have high driving power; thus, it is expected that the elimination of these inhibiting factors would lead to the dissemination of telemedicine. Conclusions: There are many kinds of factors inhibiting the dissemination of telemedicine in Japan. The result of this showed the structure of these factors visually and could be useful to solve the problem inhibiting the dissemination of telemedicine effectively and efficiently.
• 診療放射線技師の地理的分布均一性の維持に向けた学生への就職選好調査

  谷川原 綾子, 藤原 健祐, 井上 剛, 北川 剛, 木村 徹, 渡邊 良晴, 小笠原 克彦

  日本放射線技術学会雑誌 77 4 319 - 325 (公社)日本放射線技術学会 2021年04月
• Mediating Factors Between Parental Socioeconomic Status and Small for Gestational Age in Infants: Results from the Hokkaido Study on Environment and Children’s Health

  Naomi Tamura, Tomoyuki Hanaoka, Kumiko Ito, Atsuko Araki, Chihiro Miyashita, Sachiko Ito, Sumitaka Kobayashi, Yoichi Ito, Hisanori Minakami, Kazutoshi Cho, Toshiaki Endo, Tsuyoshi Baba, Kazuo Sengoku, Toshinobu Miyamoto, Katsuhiko Ogasawara, Reiko Kishi

  Maternal and Child Health Journal 25 4 645 - 655 2021年04月 

  OBJECTIVES: Previous studies indicated a significant association between small for gestational age (SGA) in infants and their parents' socioeconomic status (SES). Thus, this study aimed to examine if parental factors, such as maternal smoking, and the pre-pregnancy body mass index (BMI) could mediate the associations between parental SES and SGA. METHODS: The participants of this study were pregnant women who enrolled in an ongoing birth cohort study, the Hokkaido study, during the first trimester of their pregnancies. A total of 14,593 live singleton births were included in the statistical analysis, of which 1011 (6.9%) were SGA. Two structural equation models were employed to evaluate the associations between parental SES, parental characteristics, and SGA. RESULTS: The effect of low SES on SGA was directly mediated by maternal pre-pregnancy BMI, smoking during the third trimester, and alcohol consumption during the first trimester in the first model, which was based the assumption of independent associations between mediating factors. In the second model, which additionally considered the mediating factors from the first model, smoking during pregnancy mediated decline in parental SES, consequently increased SGA. Moreover, an increase in pregnancy smoking status increased the prevalence of lower maternal pre-pregnancy BMI and its effect on SGA. CONCLUSIONS FOR PRACTICE: In this study, we observed the independent mediating effect of maternal pre-pregnancy BMI, smoking, and alcohol consumption during pregnancy on low SES and, consequently, SGA, with the additional mediating pathway of SES to smoking to low BMI on SGA.
• A Bayesian Network-Based Browsing Model for Patients Seeking Radiology-Related Information on Hospital Websites: Development and Usability Study.

  Ryusuke Suzuki, Teppei Suzuki, Shintaro Tsuji, Kensuke Fujiwara, Hiroko Yamashina, Akira Endoh, Katsuhiko Ogasawara

  Journal of medical Internet research 23 1 e14794  2021年01月19日 

  BACKGROUND: An increasing number of people are visiting hospital websites to seek better services and treatments compared to the past. It is therefore important for hospitals to develop websites to meet the needs of their patients. However, few studies have investigated whether and how the current hospital websites meet the patient's needs. Above all, in radiation departments, it may be difficult for patients to obtain the desired information regarding modality and diagnosis because such information is subdivided when described on a website. OBJECTIVE: The purpose of this study is to suggest a hospital website search behavior model by analyzing the browsing behavior model using a Bayesian network from the perspective of one-to-one marketing. METHODS: First, we followed the website access log of Hokkaido University Hospital, which was collected from September 1, 2016, to August 31, 2017, and analyzed the access log using Google Analytics. Second, we specified the access records related to radiology from visitor browsing pages and keywords. Third, using these resources, we structured 3 Bayesian network models based on specific patient needs: radiotherapy, nuclear medicine examination, and radiological diagnosis. Analyzing each model, this study considered why some visitors could not reach their desired page and improvements to meet the needs of visitors seeking radiology-related information. RESULTS: The radiotherapy model showed that 74% (67/90) of the target visitors could reach their requested page, but only 2% (2/90) could reach the Center page where inspection information, one of their requested pages, is posted. By analyzing the behavior of the visitors, we clarified that connecting with the radiotherapy and radiological diagnosis pages is useful for increasing the proportion of patients reaching their requested page. CONCLUSIONS: We proposed solutions for patient web-browsing accessibility based on a Bayesian network. Further analysis is necessary to verify the accuracy of the proposed model in comparison to other models. It is expected that information provided on hospital websites will be improved using this method.
• Comparison of Health-Related Quality of Life Between Japanese and American Patients with Bladder Cancer as Measured by a Newly Developed Japanese Version of the Bladder Cancer Index

  Takahiro Osawa, John T. Wei, Takashige Abe, Michitaka Honda, Karl T. Rew, Rod Dunn, Shuhei Yamada, Jun Furumido, Hiroshi Kikuchi, Ryuji Matsumoto, Yasuyuki Sato, Toni Harabayashi, Norikata Takada, Keita Minami, Ken Morita, Akira Kashiwagi, Shunichi Fukuhara, Sachiyo Murai, Yoichi M. Ito, Katsuhiko Ogasawara, Nobuo Shinohara

  BLADDER CANCER 7 1 61 - 69 2021年 

  INTRODUCTION: The aim of this study is to characterize health related quality of life (HRQOL) in Japanese patients after bladder cancer surgery and to perform cross-cultural comparison between Japanese and American patients.METHODS: Firstly, we cross-sectionally assessed HRQOL of 371 patients in Japan using the Bladder Cancer Index (BCI- Japanese). HRQOL of the four groups of patients (native bladder without intravesical therapy, native bladder with intravesical therapy, cystectomy with ileal conduit, and cystectomy with neobladder) were assessed. Secondly, we compared the Japanese with the American cohort (n = 315) from the original BCI paper. After adjusting for age and gender, the differences in each BCI subdomain score was analyzed.RESULTS: Among Japanese patients, the urinary domain function score was significantly lower among the cystectomy with neobladder group, compared to the cystectomy with ileal conduit group (p < 0. 01). Despite this, the urinary bother was comparable between the two groups. Although there were apparent differences between Japanese and American patients, there were few differences in Urinary and Bowel HRQOL. In three of the four treatment groups (other than native bladder with intravesical therapy), Japanese patients were more likely than Americans to report poor sexual function (p < 0.05). However, Japanese patients were less likely than Americans to be bothered by their lower sexual function, regardless of treatment (p <0.05).CONCLUSIONS: HRQOL outcomes following treatment of bladder cancer in Japan are comparable to those in the USA, except for sexual functioning and sexual bother. The BCI can be used for cross-cultural assessments of HRQOL in bladder cancer patients.
• 大学におけるヘルスケア関連リカレント教育の展開:―小樽商科大学ビジネススクールの取組事例―

  藤原 健祐, 鈴木 哲平, 椎名 希美, 青木 智大, 小笠原 克彦

  産学連携学 17 2 2_76 - 2_90 特定非営利活動法人 産学連携学会 2021年 

  人生100年時代や技術革新の進展を見据え，近年，高等教育機関での社会人再教育 (リカレント教育) の社会的ニーズが高まっている．本稿では，多様なリカレント教育プログラムの創出および既存プログラムの内容やその運営に寄与することを目的として，小樽商科大学ビジネススクール (OBS) におけるヘルスケア関連リカレント教育の取組事例を紹介する．ヘルスケア領域では，医療・介護サービスといった専門領域に特化した知識・技術を有するだけではなく，経営学やマネジメントの知識を含め複眼的な視点を有する人材が求められている状況にあり，OBSでは正課科目としての特殊講義や履修証明プログラムをリカレント教育プログラムとして社会人の方々に開放し，人材育成とビジネス・エコシステムの構築を推進している．

• Trend of Gini coefficient of healthcare resources in China from 1998 to 2016

  Yuchen Yang, Yasuhiro Morii, Kensuke Fujiwara, Tomoki Ishikawa, Hiroko Yamashina, Teppei Suzuki, Jun Nakaya, Katsuhiko Ogasawara

  Journal of Hospital Management and Health Policy 5 40 - 40 2021年01月
• Health-related quality of life in Japanese patients with bladder cancer measured by a newly developed Japanese version of the Bladder Cancer Index.

  Takahiro Osawa, John T Wei, Takashige Abe, Michitaka Honda, Shuhei Yamada, Jun Furumido, Hiroshi Kikuchi, Ryuji Matsumoto, Kazushi Hirakawa, Yasuyuki Sato, Yoshihiro Sasaki, Toru Harabayashi, Norikata Takada, Keita Minami, Hiroshi Tanaka, Ken Morita, Akira Kashiwagi, Naoto Miyajima, Tomoshige Akino, Sachiyo Murai, Yoichi M Ito, Shunichi Fukuhara, Katsuhiko Ogasawara, Nobuo Shinohara

  International journal of clinical oncology 25 12 2090 - 2098 2020年12月 

  INTRODUCTION: We validated a Japanese version of the Bladder Cancer Index (BCI) as a tool for measuring health-related quality of life (HRQOL) in bladder cancer patients treated with various surgical procedures. METHODS: The reliability and validity of the Japanese BCI were examined in 397 Japanese patients with bladder cancer via cross-sectional analysis. The patients simultaneously completed the Short Form (SF)-12, EQ-5D, and the Functional Assessment of Cancer Therapy-General and Bladder (FACT-G and FACT-BL). The differences in BCI subscales among various treatment groups were analyzed. RESULTS: This study involved 397 patients (301 males and 96 females), with a mean age of 70 years and a median disease duration of 29 months (IQR: 12-66 months). Of these patients, 221 underwent transurethral resection of a bladder tumor, and 176 patients underwent radical cystectomy (ileal conduit: 101 patients, ileal neobladder: 49, and ureterostomy: 26). Cronbach's alpha coefficient was ≥ 0.78 for all subscales, except the bowel bother subscale. Despite moderate correlations being detected between the function and bother score in urinary and bowel domains, the sexual function score was inversely correlated with the sexual bother score (r = - 0.19). A missing value percentage of > 15% was associated with old age (p < 0.05). The mean domain scores differed significantly among distinct clinically relevant treatment groups. CONCLUSIONS: Although revisions are needed to make it easier for elderly patients to comprehend, we confirmed the reliability and validity of the Japanese BCI. The Japanese BCI could be used for cross-cultural assessments of HRQOL in bladder cancer patients.
• Projecting supply and demand for pharmacists in pharmacies based on the number of prescriptions and system dynamics modeling.

  Yasuhiro Morii, Seiichi Furuta, Tomoki Ishikawa, Kensuke Fujiwara, Hiroko Yamashina, Katsuhiko Ogasawara

  Human resources for health 18 1 85 - 85 2020年11月05日 

  BACKGROUND: Pharmacists play an important role in promoting people's health in Japan, which has an aging population. Hence, it is necessary that the distribution of pharmacists meets the population's needs in each region. This study projects the future supply and demand for pharmacists in pharmacies to consider an optimal distribution of pharmacists. METHODS: The future supply of pharmacists working in pharmacies in Hokkaido is projected using system dynamics modeling, according to their career path. The demand is projected based on the number of prescriptions, sourced from publicly available sources. The analysis period is 2015-2040. The estimated demand is converted into the number of pharmacists and the sufficiency is evaluated using sufficiency ratio (supply/demand ratio). Sensitivity analyses of the sufficiency ratio were conducted to estimate the effects of changes in parameters such as national exam pass rate, enrollments, attrition rates, the number of prescriptions per pharmacist, and diffusion of newly licensed pharmacists. RESULTS: The projected supply, in 2025 and 2040, is 1.24 and 1.56 times, respectively, as that in 2015 and the demand is 1.11 and 0.98 times, respectively. In 2015, although the sufficiency ratio in Hokkaido overall is 1.19, the ratios are higher in urban medical areas and lower than 1 in rural medical areas, such as Minamihiyama, Emmon, and Nemuro. By 2040, the sufficiency ratios are greater than 1 for all areas except for Emmon and higher than 2 in some areas. The sensitivity analyses found that the sufficiency ratio was most sensitive to diffusion of newly licensed pharmacists and the number of prescriptions per pharmacist. CONCLUSION: Optimal distribution should be considered, as the results reveal a possible shortage in the number of pharmacists in rural medical areas in 2015-2025. Conversely, as the demand is projected to decrease after 2025 with a population decrease, future supply should be determined in order not to cause an oversupply after 2025. Refinements of the projection model should be conducted since the related factors such as the roles of pharmacists will change over time.
• Changing Emotions About Fukushima Related to the Fukushima Nuclear Power Station Accident-How Rumors Determined People's Attitudes: Social Media Sentiment Analysis.

  Shin Hasegawa, Teppei Suzuki, Ayako Yagahara, Reiko Kanda, Tatsuo Aono, Kazuaki Yajima, Katsuhiko Ogasawara

  Journal of medical Internet research 22 9 e18662  2020年09月02日 

  BACKGROUND: Public interest in radiation rose after the Tokyo Electric Power Company (TEPCO) Fukushima Daiichi Nuclear Power Station accident was caused by an earthquake off the Pacific coast of Tohoku on March 11, 2011. Various reports on the accident and radiation were spread by the mass media, and people displayed their emotional reactions, which were thought to be related to information about the Fukushima accident, on Twitter, Facebook, and other social networking sites. Fears about radiation were spread as well, leading to harmful rumors about Fukushima and the refusal to test children for radiation. It is believed that identifying the process by which people emotionally responded to this information, and hence became gripped by an increased aversion to Fukushima, might be useful in risk communication when similar disasters and accidents occur in the future. There are few studies surveying how people feel about radiation in Fukushima and other regions in an unbiased form. OBJECTIVE: The purpose of this study is to identify how the feelings of local residents toward radiation changed according to Twitter. METHODS: We used approximately 19 million tweets in Japanese containing the words "radiation" (), "radioactivity" (), and "radioactive substances" () that were posted to Twitter over a 1-year period following the Fukushima nuclear accident. We used regional identifiers contained in tweets (ie, nouns, proper nouns, place names, postal codes, and telephone numbers) to categorize them according to their prefecture, and then analyzed the feelings toward those prefectures from the semantic orientation of the words contained in individual tweets (ie, positive impressions or negative impressions). RESULTS: Tweets about radiation increased soon after the earthquake and then decreased, and feelings about radiation trended positively. We determined that, on average, tweets associating Fukushima Prefecture with radiation show more positive feelings than those about other prefectures, but have trended negatively over time. We also found that as other tweets have trended positively, only bots and retweets about Fukushima Prefecture have trended negatively. CONCLUSIONS: The number of tweets about radiation has decreased overall, and feelings about radiation have trended positively. However, the fact that tweets about Fukushima Prefecture trended negatively, despite decreasing in percentage, suggests that negative feelings toward Fukushima Prefecture have become more extreme. We found that while the bots and retweets that were not about Fukushima Prefecture gradually trended toward positive feelings, the bots and retweets about Fukushima Prefecture trended toward negative feelings.
• Characteristics of type-2 diabetics who are prone to high-cost medical care expenses by Bayesian network

  Yuji Sase, Daiki Kumagai, Teppei Suzuki, Hiroko Yamashina, Yuji Tani, Kensuke Fujiwara, Takumi Tanikawa, Hisashi Enomoto, Takeshi Aoyama, Wataru Nagai, Katsuhiko Ogasawara

  International Journal of Environmental Research and Public Health 17 15 1 - 10 2020年08月01日 

  © 2020 by the authors. Licensee MDPI, Basel, Switzerland. Objective: This study aims to determine the characteristics of Type 2 diabetic patients who are more likely to cause high-cost medical expenses using the Bayesian network model. Methods: The 2011–2015 receipt data of Iwamizawa city, Japan were collected from the National Health Insurance Database. From the record, we identified patients with Type 2 diabetes with the following items: age, gender, area, number of days provided medical services, number of diseases, number of medical examinations, annual healthcare expenditures, and the presence or absence of hospitalization. The Bayesian network model was applied to identify the characteristics of the patients, and four observed values were changed using a model for patients who paid at least 3607 USD a year for medical expenses. The changes in the conditional probability of the annual healthcare expenditures and changes in the percentage of patients with high-cost medical expenses were analyzed. Results: After changing the observed value, the percentage of patients with high-cost medical expense reimbursement increased when the following four conditions were applied: the patient “has ever been hospitalized”, “had been provided medical services at least 18 days a year”, “had at least 14 diseases listed on medical insurance receipts”, and “has not had specific health checkups in five years”. Conclusions: To prevent an excessive rise in healthcare expenditures in Type 2 diabetic patients, measures against complications and promoting encouragement for them to undergo specific health checkups are considered as effective.
• Association between Physical Activity Levels and Body Composition among Healthy Older Japanese Adults during a Snowy Winter: A Cross-Sectional Study.

  Tomoko Shimoda, Teppei Suzuki, Kaori Tsutsumi, Mina Samukawa, Sadako Yoshimura, Katsuhiko Ogasawara

  International journal of environmental research and public health 17 15 2020年07月23日 

  BACKGROUND: Despite a long average lifespan, increased life expectancy does not guarantee higher quality of life. METHODS: To contribute in understanding some determinants of healthy life expectancies in older Japanese individuals in a snowy winter region, we investigated the indicators of health. Local residents (n = 124) in the city of Iwamizawa volunteered for health examinations from January 2016 to March 2016. We recorded activity via daily steps for 2-week periods. In addition, we measured body composition, grip strength, and assessed nutritional status. RESULTS: Analysis of body composition and daily activity indicated that women who walked more than 4000 steps had lower fat mass and increased muscle mass. Men with >3.0 metabolic equivalents (METs) when walking had lower body fat. CONCLUSION: For healthy older Japanese individuals in this snowy winter region, walking >4000 steps daily for women and exercise of >3.0 METs for men may indicate health-promoting activities.
• Development of a Deep Learning-Based Algorithm to Detect the Distal End of a Surgical Instrument

  Hiroyuki Sugimori, Taku Sugiyama, Naoki Nakayama, Akemi Yamashita, Katsuhiko Ogasawara

  Applied Sciences 10 12 2020年06月 [査読有り][通常論文]
  
• Possibility of introducing telemedicine services in Asian and African countries

  Suzuki T, Hotta J, Kuwabara T, Yamashina H, Ishikawa T, Tani Y, Ogasawara K

  Health Policy and Technology 9 1 13 - 22 2020年 [査読有り][通常論文]
  
• 診療情報の漏えいに関する仮想評価法による受入意思額の推定

  谷川 琢海, 笹本 恭平, 谷 祐児, 小笠原 克彦

  日本放射線技術学会雑誌 75 11 1277 - 1285 (公社)日本放射線技術学会 2019年11月
• アイトラッキングによるマンモグラフィ撮影時の注視点検出：熟練者と初学者の比較

  山品博子, 狩野栞, 鈴木哲平, 谷川原綾子, 小笠原克彦

  日本放射線技術学雑誌 75 11 1316 - 1324 2019年11月 [査読有り][通常論文]
  
• Cost comparison between open radical cystectomy, laparoscopic radical cystectomy, and robot-assisted radical cystectomy for patients with bladder cancer: a systematic review of segmental costs

  Yasuhiro Morii, Takahiro Osawa, Teppei Suzuki, Nobuo Shinohara, Toru Harabayashi, Tomoki Ishikawa, Takumi Tanikawa, Hiroko Yamashina, Katsuhiko Ogasawara

  BMC Urology 19 1 110 - 110 Springer 2019年11月 [査読有り][通常論文]
   

  BACKGROUND: Robot-assisted radical cystectomy is becoming a common treatment for bladder carcinoma. However, in comparison with open radical cystectomy, its cost-effectiveness has not been confirmed. Although few published reviews have compared total costs between the two surgical procedures, no study has compared segmental costs and explained their impact on total costs. METHODS: A systematic review was conducted based on studies on the segmental costs of open, laparoscopic, and robot-assisted radical cystectomy using PubMed, Web of Science, and Cochrane Library databases to provide insight into cost-effective management methods for radical cystectomy. The segmental costs included operating, robot-related, complication, and length of stay costs. A sensitivity analysis was conducted to determine the impact of the annual number of cases on the per-case robot-related costs. RESULTS: We identified two studies that compared open and laparoscopic surgeries and nine that compared open and robotic surgeries. Open radical cystectomy costs were higher than those of robotic surgeries in two retrospective single-institution studies, while robot-assisted radical cystectomy costs were higher in 1 retrospective single-institution study, 1 randomized controlled trial, and 4 large database studies. Operating costs were higher for robotic surgery, and accounted for 63.1-70.5% of the total robotic surgery cost. Sensitivity analysis revealed that robot-related costs were not a large proportion of total surgery costs in institutions with a large number of cases but accounted for a large proportion of total costs in centers with a small number of cases. CONCLUSIONS: The results show that robot-assisted radical cystectomy is more expensive than open radical cystectomy. The most effective methods to decrease costs associated with robotic surgery include a decrease in operating time and an increase in the number of cases. Further research is required on the cost-effectiveness of surgeries, including quality measures such as quality of life and quality-adjusted life years.
• Relationship between accessibility and resources to treat acute ischemic stroke in Hokkaido, Japan

  Ishikawa T, Mizuguchi H, Murayama H, Fujiwara K, Tanikawa T, Kobayashi E, Ogasawara K

  Health Policy and Technology 2019年10月 [査読有り][通常論文]
  
• 生活習慣の改善意思に影響を与える要因および地域性の可視化―ベイジアンネットワークを用いた自治体の特定健診データ分析―

  鈴木 哲平, 田村菜穂美, 榎本 尚司, 永井 亘, 小笠原克彦

  医療情報学 39 2 85 - 98 篠原出版新社 2019年10月 [査読有り][通常論文]
  
• 放射線技術学用語集の電子化に向けて【後編】学術調査研究班から用語集管理小委員会までの活動

  谷川原 綾子, 辻 真太朗, 福田 晋久, 西本 尚樹, 谷川 琢海, 川眞田 実, 内田 幸司, 小笠原 克彦, 用語集管理小委員会

  日本放射線技術学会雑誌 75 9 1101 - 1108 (公社)日本放射線技術学会 2019年09月
• Forecasting maldistribution of human resources for healthcare and patients in Japan: a utilization-based approach

  Tomoki Ishikawa, Yuji Nakao, Kensuke Fujiwara, Teppei Suzuki, Shintaro Tsuji, Katsuhiko Ogasawara

  BMC Health Service Research 19 1 653 - 653 Springer 2019年09月 [査読有り][通常論文]
   

  BACKGROUND: Hokkaido's demographic trend of population decrease with aging population is remarkable even in Japan. Although healthcare policy decision-makers need to appropriately allocate resources while grasping regional demands, not much is available on whether medical demand would increase or not for future. In addition, little is known about what impact will current situation have on future demand-supply balance and equality by regions. This study aims to support decision-making in human resource planning for coping with changing population structure by forecasting future demand, and evaluation those regional maldistributions. METHOD: We set patients with acute myocardial infarction or cerebral stroke, and all medical care as study subjects and analyzed for 2015, 2025, and 2035 in Hokkaido and each Secondary Medical Care Area. We used a utilization-based approach to estimate the healthcare supply-demand balance in the future. Moreover, we evaluated the regional maldistribution of demand-supply balance by calculating Herfindahl-Hirschman Index, Gini Coefficients, the number of physicians/specialists per patient. Moreover, we conducted sensitivity analysis to evaluation impact on aspects of demand-supply balance by uncertainty of utilization for future. RESULTS: Our results displayed that concentration of patients will progress, while regional distribution will shrink in all subject. However, from comparison based on all medical care, Gini Coefficients of acute myocardial infarction and cerebral stroke has always been high. This suggest that the resource allocation of them has room for improvement. In addition, our analysis showed the change in this balance will differ in each region in the future. Moreover, demographic change will not consistent with the number of patient change from 2015 to 2035. CONCLUSION: These results suggest policy planners should use the number of patient by disease, by region as indicator of demand, instead of provider-to-population ratios being in use today. The result of our sensitivity analysis show two findings. First, the range of each indicator have possible for future. Second, increase of utilization, for instance lowing barrier in the use by development operation of patient transportation in AMI/CS, would improve maldistribution of opportunity for resident to get emergency medical services.
• A Cost-Effectiveness Simulation of Specialist Dispatching System in Japan for Treatments of Patients with Acute Ischemic Stroke Using a Geographic Information System.

  Morii Y, Osanai T, Ishikawa T, Fujiwara K, Tanikawa T, Kobayashi E, Ogasawara K

  Studies in health technology and informatics 264 1861 - 1862 2019年08月21日 [査読有り][通常論文]
   

  Regional disparities in the implementation rates of recombinant tissue-type plasminogen activator and endovascular thrombectomy treatments have been reported in Japan. We simulated the cost-effectiveness of specialist dispatching system in Hokkaido, Japan using Geographic Information System. In the system a qualified specialist is dispatched to another hospital for endovascular thrombectomy. Since the system improved patient accessibility, and the cost- effectiveness was excellent, the system could help enhance the equality and cost-effectiveness of ischemic stroke treatments in Hokkaido.
• 放射線技術学用語集の電子化に向けて【前編】日本放射線技術学会における専門用語集構築の変遷と歴史

  辻 真太朗, 谷川原 綾子, 福田 晋久, 西本 尚樹, 谷川 琢海, 川眞田 実, 内田 幸司, 小笠原 克彦, 用語集管理小委員会

  日本放射線技術学会雑誌 75 8 854 - 860 (公社)日本放射線技術学会 2019年08月
• Efficacy of 'drive and retrieve' as a cooperative method for prompt endovascular treatment for acute ischemic stroke.

  Toshiya Osanai, Yasuhiro Ito, Satoshi Ushikoshi, Takeshi Aoki, Masahito Kawabori, Kensuke Fujiwara, Katsuhiko Ogasawara, Kikutaro Tokairin, Katsuhiko Maruichi, Naoki Nakayama, Ken Kazumata, Kota Ono, Kiyohiro Houkin

  Journal of neurointerventional surgery 11 8 757 - 761 2019年08月 [査読有り][通常論文]
   

  BACKGROUND: Outcomes of endovascular treatment for acute ischemic stroke depend on the time interval from onset to reperfusion. Although the centralized 'mothership' method is considered preferable, the required transportation time increases the risk that a patient with a stroke may not receive intravenous or endovascular therapy. In contrast, 'drive and retrieve' describes a system wherein doctors from comprehensive stroke centers travel to primary stroke centers and provide endovascular treatment for acute ischemic stroke. OBJECTIVE: To describe the drive and retrieve system and verify the effects of this new collaboration on outcomes in patients with acute ischemic stroke among facilities. METHODS: This non-randomized, single-arm study retrospectively analyzed patients who met the inclusion criteria for endovascular treatment provided through a drive and retrieve system. Among the 122 patients treated by this system, we analyzed the time of onset to recanalization as the primary outcome. We also analyzed the efficacy of the drive and retrieve system using geographic information system analysis. RESULTS: The median time from onset to recanalization was 229 min (IQR 170-307 min, 95% CI 201 to 252 min). The upper limit of the 95% CI for the time from onset to recanalization was shorter than the median times reported in two previous trials. Geographic information system analysis revealed an upward trend in the population coverage rate in each secondary medical area after the drive and retrieve method was introduced. CONCLUSION: The drive and retrieve method may be an effective form of cooperation between facilities located within 1 hour of a comprehensive stroke center.
• Simulating Cost-effectiveness of Continuous Glucose Monitoring Mobile Application for Patient with Type 2 Diabetes Mellitus

  Tsuji s, Zhang H, Suzuki T, Ishikawa T, Morii Y, Tanikawa T, Nakaya J, Ogasawara K

  Journal of Medical Internet Research 22 9 e16053  2019年08月 [査読有り][通常論文]
   

  BACKGROUND: Apps for real-time continuous glucose monitoring (CGM) on smartphones and other devices linked to CGM systems have recently been developed, and such CGM apps are also coming into use in Japan. In comparison with conventional retrospective CGM, the use of CGM apps improves patients' own blood glucose control, which is expected to help slow the progression of type 2 diabetes mellitus (DM) and prevent complications, but the effect of their introduction on medical costs remains unknown. OBJECTIVE: Our objective in this study was to perform an economic appraisal of CGM apps from the viewpoint of assessing public medical costs associated with type 2 DM, using the probability of developing type 2 DM-associated complications, and data on medical costs and utility value to carry out a medical cost simulation using a Markov model in order to ascertain the cost-effectiveness of the apps. METHODS: We developed a Markov model with the transition states of insulin therapy, nephrosis, dialysis, and cardiovascular disease, all of which have a major effect on medical costs, to identify changes in medical costs and utility values resulting from the introduction of a CGM app and calculated the incremental cost-effectiveness ratio (ICER). RESULTS: The ICER for CGM app use was US $33,039/quality-adjusted life year (QALY). CONCLUSIONS: Sensitivity analyses showed that, with the exception of conditions where the transition probability of insulin therapy, utility value, or increased medical costs increases, the ICER for the introduction of CGM apps was below the threshold of US $43,478/QALY used by the Central Social Insurance Medical Council. Our results provide basic data on the cost-effectiveness of introducing CGM apps, which are currently starting to come into use.
• Cost effectiveness of Drive and Retrieve System in Hokkaido for Acute Ischemic Stroke Patient Treatment Using Geographic Information System

  Morii Y, Osanai T, Ishikawa T, Fujiwara K, Tanikawa T, Houkin K, Kobayashi E, Ogasawara K

  Journal of Stroke and Cerebrovascular Diseases 28 8 2292 - 2301 2019年08月 [査読有り][通常論文]
  
• Survey on the willingness to pay for tele-health consultation

  Teppei Suzuki, Tamotsu Abe, Shintaro Tsuji, Tomoko Shimoda, Sadako Yoshimura, Katsuhiko Ogasawara

  Health Policy and Technology Health Policy and Technology 2019年07月 [査読有り][通常論文]
  
• Projecting future supply and demand for physical therapists in Japan using system dynamics

  Morii Yasuhiro, Ishikawa Tomoki, Suzuki Teppei, Tsuji Shintaro, Yamanaka Masanori, Ogasawara Katsuhiko, Yamashina Hiroko

  HEALTH POLICY AND TECHNOLOGY 8 2 118 - 127 2019年06月 [査読有り][通常論文]
  
• Where Does Telemedicine Achieve a Cost Reduction Effect? Cost Minimization Analysis of Teleradiology Services in Japan

  Takumi Tanikawa, Reina Suzuki, Teppei Suzuki, Tomoki Ishikawa, Hiroko Yamashina, Shintaro Tsuji, Katsuhiko Ogasawara

  Telemedicine and e-Health 25 12 1174 - 1182 2019年04月 [査読有り][通常論文]
   

  Background: Telemedicine as a technology is expected to resolve issues such as doctor shortages and disparities in medical services. However, high costs of system installation and maintenance inhibit its widespread use. Introduction: This study involved a cost minimization analysis for installation of a teleradiology system in the Hokkaido prefecture of Japan. Conditions under which system utilization is cost-efficient and system utilization is effective for cost reduction were analyzed. Materials and Methods: A cost minimization analysis was conducted using three geospatial points of 50, 100, and 200 km from Sapporo city, the prefectural capital of Hokkaido, assuming a central imaging diagnosis center in Sapporo. The analysis was conducted from the standpoint of both patients and requesting hospitals. Results: From the patient's standpoint, a cost reduction effect was observed at all three distances from system installation. In contrast, from the hospital's standpoint, a cost reduction effect was found only when teleradiology examination was conducted from a distance of at least 100 km from Sapporo. Discussion: Results show that the cost reduction effect for patients increased as the travel distance increased. Although the teleradiology service is beneficial for a wide range of patients, the financial burden on requesting hospitals is significant. Conclusions: The following conditions were found necessary to reduce the requesting hospital's financial burden: the hospital should be far from the imaging diagnosis center, an inexpensive system is to be selected, and the system needs to be utilized continuously.
• 相関分析を用いた医療機器および病院情報システム導入時における重要因子の検討

  谷 祐児, 藤原 健祐, 鈴木 哲平, 小笠原 克彦

  日本放射線技術学会雑誌 75 5 429 - 437 (公社)日本放射線技術学会 2019年 [査読有り][通常論文]
   

  医療機器および病院情報システム(HIS)の導入における重要因子を、相関分析を用いて検討した。対象病院におけるHIS導入に向けて、まずプロジェクトチーム(PT)を7名で発足させた。PT主導の下に、他病院のシステム見学会、医療情報システム関連勉強会等をはじめとした全職員およびワーキンググループ(WG)メンバーに向けた情報提供を実施し、各イベント終了時にはアンケート調査を実施した。今回試行した一連の手法は対象病院では過去にまったく経験がなかったため、WG活動開始直後は戸惑いからか各メンバーとも積極性はあまりみられず、WGミーティングにおいても各メンバーからの発言や意見はあまり出なかった。各イベントにより相関分析の結果は多少異なるが、プロジェクト関連当該イベントの必要度と参加意欲間およびプロジェクト関連当該イベントの満足度と参加意欲間で有意に高い相関が認められた。
• Analysis of the Regionality of the Number of Tweets Related to the 2011 Fukushima Nuclear Power Station Disaster: Content Analysis

  Tomohiro Aoki, Teppei Suzuki, Ayako Yagahara, Shin Hasegawa, Shintaro Tsuji, Katsuhiko Ogasawara

  JMIR Public Health Surveill 4 4 1 - 11 2018年12月 [査読有り][通常論文]
   

  BACKGROUND: The Great East Japan Earthquake on March 11, 2011, triggered a huge tsunami, causing the Fukushima Daiichi nuclear disaster. Radioactive substances were carried in all directions, along with the risks of radioactive contamination. Mass media companies, such as television stations and news websites, extensively reported on radiological information related to the disaster. Upon digesting the available radiological information, many citizens turned to social media, such as Twitter and Facebook, to express their opinions and feelings. Thus, the Fukushima Daiichi nuclear disaster also changed the social media landscape in Japan. However, few studies have explored how the people in Japan who received information on radiation propagated the information. OBJECTIVE: This study aimed to reveal how the number of tweets by citizens containing radiological information changed regionally on Twitter. METHODS: The research used about 19 million tweets that included the terms "radiation," "radioactivity," and "radioactive substance" posted for 1 year after the Fukushima Daiichi nuclear disaster. Nearly 45,000 tweets were extracted based on their inclusion of geographic information (latitude and longitude). The number of monthly tweets in 4 districts (Fukushima Prefecture, prefectures around Fukushima Prefecture, within the Tokyo Electric Power Company area, and others) were analyzed. RESULTS: The number of tweets containing the keywords per 100,000 people at the time of the casualty outbreak was 7.05 per month in Fukushima Prefecture, 2.07 per month in prefectures around Fukushima Prefecture, 5.23 per month in the area within Tokyo Electric Power Company, and 1.35 per month in others. The number of tweets per 100,000 people more than doubled in Fukushima Prefecture 2 months after the Fukushima Daiichi nuclear disaster, whereas the number decreased to around 0.7~0.8 tweets in other districts. CONCLUSIONS: The number of tweets per 100,000 people became half of that on March 2011 3 or 4 months after the Fukushima Daiichi Nuclear Plant disaster in 3 districts except district 1 (Fukushima Prefecture); the number became a half in Fukushima Prefecture half a year later.
• 診療放射線技師数の需要と供給の将来予測

  青木 祐美, 谷 祐児, 藤原 健祐, 小笠原 克彦

  JART: 日本診療放射線技師会誌 65 10 1157 - 1163 (公社)日本診療放射線技師会 2018年10月 

  近年、診療放射線技師養成校は増加傾向にある一方で、医療機関数は病院で年々減少傾向にある。本研究では、診療放射線技師数の需要と供給の将来予測を行った。供給予測はコーホート要因法を用い、さらに感度分析により供給に大きく影響を与える要因を検討した。需要予測は、1医療機関当たりの診療放射線技師数から推計し、病院数減少が止まる楽観例と減少し続ける悲観例で予測を行い供給数と比較検討した。診療放射線技師の供給は、今後20年間で9,768人(21.25%)増、40年間で13,945人(30.34%)増となり、大きく影響を与える要因は、国家試験合格率・医療機関就職率・技師養成校定員であった。需要予測では、楽観例・悲観例共に供給過剰になると予想された。(著者抄録)
• Evaluating the adequacy of medical care systems in Hokkaido, Japan

  Tomomi Kuwabara, Ayako Yagahara, Katsuhiko Ogasawara

  Health Policy and Technology Elsevier {BV} 2018年09月 [査読無し][通常論文]
  
• Penetration factors and introduction possibility for image diagnostic equipment

  Teppei Suzuki, Yusuke Isomi, Shintaro Tsuji, Yuji Tani, Takumi Tanikawa, Hiroko Yamasina, Katsuhiko Ogasawara

  Health Policy and Technology 7 2 142 - 148 2018年06月01日 [査読有り][通常論文]
   

  Background: This study investigated and analyzed the relationship between medical resources and economic conditions of OECD member countries and extracted factors for introducing imaging diagnostic equipment in each country. We also investigated the possibility of introducing diagnostic imaging equipment. Methods: A principal component analysis was conducted from medical environment indices and economic situation indices the results were visualized on a graph with the extracted two principal components as axes, and the target nations were categorized according to the possibility of introducing diagnostic imaging equipment. Next, with the number of CTs and MRIs as response variables, we visualized the probability results on a graph by conducting a multiple regression analysis with the indices as explanatory variables and extracting the most influential factors on the number of diagnostic imaging equipment introduced. Results: We classified 29 countries into four groups according to medical environment and economic situation indices. By extracting from the four groups a group with a high possibility for introducing medical equipment then conducting a multiple regression analysis with CT and MRI unit counts as objective variables and other medical environment and economic situation indices as explanatory variables, it became clear that the factor with the greatest influence on CT and MRI unit counts is the number of hospital beds. Conclusion: As topics of future studies, we would like to clarify the factors behind as well as the probability for the introduction of medical equipment in each nation by researching high-growth medical equipment markets.
• Factors affecting bone mineral density among snowy region residents in Japan: Analysis using multiple linear regression and Bayesian network model

  Teppei Suzuki, Tomoko Shimoda, Noriko Takahashi, Kaori Tsutsumi, Mina Samukawa, Sadako Yoshimura, Katsuhiko Ogasawara

  Journal of Medical Internet Research 20 5 e10  2018年05月01日 [査読無し][通常論文]
   

  Background: As the onset of osteoporosis leads to reduced activities of daily living and may result in patients being bedridden, efforts to prevent decreased bone density are necessary. Various studies on the relationship between sex, age, nutrients, and exercise habits and bone mineral density have been conducted to date. However, for snowy region residents, the magnitude of influence of various factors affecting bone mineral density and the influence level have not been clarified. Objective: This study aimed to clarify the degree of influence and factors influencing bone mineral density based on survey results on health conditions and lifestyle habits in heavy snow areas. Methods: A total of 354 citizens who visited a drugstore in the target area were included in a study that included using the brief-type self-administered diet history questionnaire on lifestyle and exercise habits. Height, weight, body composition, and bone densitometer values were analyzed using multiple regression to calculate their association with bone mineral density. In addition, a Bayesian network model was used to determine the influence level of each factor as a conditional probability. Results: Multiple regression analysis revealed that age, sex, fracture, and calcium intake significantly influenced bone mineral density. In addition, the result of Bayesian network analysis suggested that age and sex affected bone mineral density, whereas nutrients and exercise habits might not have a direct impact. However, calcium intake and the T-score were significant factors affecting the presence or absence of fracture experiences, suggesting that adequate calcium intake is essential for preventing fractures. Conclusions: In the multiple regression analysis, age, sex, fracture, and calcium intake were selected as factors however, in the Bayesian analysis, only age and sex affected bone mineral density while nutrients did not. In addition, the fact that calcium intake and the T-score were shown to affect bone fracture history suggests that calcium intake is an important measure that can prevent bone fractures. Overall, these results suggest that measures such as ensuring a bone fracture-free environment and providing nutritional advice for calcium intake can be effective in preventing bone loss.
• Construction of mammographic examination process ontology using bottom–up hierarchical task analysis

  Ayako Yagahara, Yuki Yokooka, Guoqian Jiang, Shintarou Tsuji, Akihisa Fukuda, Naoki Nishimoto, Kunio Kurowarabi, Katsuhiko Ogasawara

  Radiological Physics and Technology 11 1 73 - 81 2018年03月01日 [査読有り][通常論文]
   

  Describing complex mammography examination processes is important for improving the quality of mammograms. It is often difficult for experienced radiologic technologists to explain the process because their techniques depend on their experience and intuition. In our previous study, we analyzed the process using a new bottom–up hierarchical task analysis and identified key components of the process. Leveraging the results of the previous study, the purpose of this study was to construct a mammographic examination process ontology to formally describe the relationships between the process and image evaluation criteria to improve the quality of mammograms. First, we identified and created root classes: task, plan, and clinical image evaluation (CIE). Second, we described an “is-a” relation referring to the result of the previous study and the structure of the CIE. Third, the procedural steps in the ontology were described using the new properties: “isPerformedBefore,” “isPerformedAfter,” and “isPerformedAfterIfNecessary.” Finally, the relationships between tasks and CIEs were described using the “isAffectedBy” property to represent the influence of the process on image quality. In total, there were 219 classes in the ontology. By introducing new properties related to the process flow, a sophisticated mammography examination process could be visualized. In relationships between tasks and CIEs, it became clear that the tasks affecting the evaluation criteria related to positioning were greater in number than those for image quality. We developed a mammographic examination process ontology that makes knowledge explicit for a comprehensive mammography process. Our research will support education and help promote knowledge sharing about mammography examination expertise.
• Relationships among tweets related to radiation: Visualization using co-occurring networks

  Ayako Yagahara, Keiri Hanai, Shin Hasegawa, Katsuhiko Ogasawara

  Journal of Medical Internet Research 20 3 e26  2018年03月01日 [査読有り][通常論文]
   

  Background: After the Fukushima Daiichi nuclear accident on March 11, 2011, interest in, and fear of, radiation increased among citizens. When such accidents occur, appropriate risk communication must provided by the government. It is therefore necessary to understand the fears of citizens in the days after such accidents. Objective: This study aimed to identify the progression of people’s concerns, specifically fear, from a study of radiation-related tweets in the days after the Fukushima Daiichi nuclear accident. Methods: From approximately 1.5 million tweets in Japanese including any of the phrases “radiation” (放射線), “radioactivity” (放射能), and “radioactive substance” (放射性物質) sent March 11-17, 2011, we extracted tweets that expressed fear. We then performed a morphological analysis on the extracted tweets. Citizens’ fears were visualized by creating co-occurrence networks using co-occurrence degrees showing relationship strength. Moreover, we calculated the Jaccard coefficient, which is one of the co-occurrence indices for expressing the strength of the relationship between morphemes when creating networks. Results: From the visualization of the co-occurrence networks, we found high citizen interest in “nuclear power plant” on March 11 and 12, “health” on March 12 and 13, “medium” on March 13 and 14, and “economy” on March 15. On March 16 and 17, citizens’ interest changed to “lack of goods in the afflicted area.” In each co-occurrence network, trending topics, citizens’ fears, and opinions to the government were extracted. Conclusions: This study used Twitter to understand changes in the concerns of Japanese citizens during the week after the Fukushima Daiichi nuclear accident, with a focus specifically on citizens’ fears. We found that immediately after the accident, the interest in the accident itself was high, and then interest shifted to concerns affecting life, such as health and economy, as the week progressed. Clarifying citizens’ fears and the dissemination of information through mass media and social media can add to improved risk communication in the future.
• Different Risk Factors for Very Low Birth Weight, Term-Small-for-Gestational-Age, or Preterm Birth in Japan.

  Naomi Tamura, Tomoyuki Hanaoka, Kumiko Ito, Atsuko Araki, Chihiro Miyashita, Sachiko Ito, Hisanori Minakami, Kazutoshi Cho, Toshiaki Endo, Kazuo Sengoku, Katsuhiko Ogasawara, Reiko Kishi

  International journal of environmental research and public health 15 2 2018年02月21日 

  From 1985 to 2013, the mean birth weight of infants in Japan decreased from 3120 g to 3000 g, and the low-birth-weight rate among live births increased from 6.3% to 9.6%. No prospective study has elucidated the risk factors for poor fetal growth and preterm birth in recent Japanese parents, such as increased parental age, maternal body figure, assisted reproductive technology (ART), and socioeconomic status. Participants were mother-infant pairs (n = 18,059) enrolled in a prospective birth cohort in Hokkaido, Japan from 2002 to 2013. Parental characteristics were obtained via self-reported questionnaires during pregnancy. Medical records helped identify very-low-birth-weight (VLBW; <1500g), term-small-for-gestational-age (term-SGA), and preterm-birth (PTB; <37 weeks) infants. We calculated relative risks (RRs) for PTB, VLBW, and term-SGA birth based on parental characteristics. The prevalence of PTB, VLBW, and term-SGA was 4.5%, 0.4%, and 6.5%, respectively. Aged parents and ART were risk factors for PTB and VLBW. Maternal alcohol drinking during pregnancy increased the risk; a parental educational level of ≥16 years reduced risk of term-SGA. Maternal pre-pregnancy BMI of <18.5 kg/m² increased the risk of PTB and term-SGA. The RR for low BMI was highest among mothers who have low educational level. Among various factors, appropriate nutritional education to maintain normal BMI is important to prevent PTB and term-SGA in Japan.
• Gd-EOB-DTPA 造影MRI 検査の大腸癌術前肝転移検索における効率の評価

  岩田邦弘, 森谷俊春, 中川貞裕, 小笠原克彦

  日本放射線技術学会雑誌 74 1 29‐38(J‐STAGE)  2018年 [査読無し][通常論文]
  
• テキストマイニングを用いた教科書からの専門用語の抽出‐放射線技術学領域における用語集の更新に向けて‐

  辻真太朗, 谷川原綾子, 福田晋久, 谷川琢海, 川眞田実, 西本尚樹, 島井健一郎, 星野修平, 小笠原克彦

  日本放射線技術学会雑誌 74 8 757‐768(J‐STAGE) - 768 2018年 [査読有り][通常論文]
   

  Although terminology requires continuous consideration of recorded technical terms, extracting these terms manually is difficult, because the number of recorded terms is constantly increasing. Text-mining acquires information from numerous documents, and is capable of extracting technical terms. The purpose of this study is to extract candidate terms using text-mining toward updating the terminology of Japanese society of radiological technology (JSRT). First, the subjects for this study were textbooks published by the JSRT, and morphological analysis was conducted, which is an analysis to break the books up into meaningful words. Additionally, index terms of textbooks were extracted. Second, we observed overlaps between the JSRT technical terms and the terms obtained from the morphological analysis and the indexes of textbooks and the extracted terms were absent in the JSRT terminology. The overlap was 53.6% (3090/5770 terms). The terms, "imaging technology for magnetic resonance" and "information and system in radiological technology" were missing from the JSRT terminology. From these results, it was estimated that half number of the JSRT technical terms were changing with time. This study demonstrated that text mining showed the differences between old and new technical terms.
• 北海道における医療従事者の地域偏在度の職種間比較

  森井康博, 石川智基, 辻真太朗, 鈴木哲平, 小笠原克彦

  医療情報学 37 6 285‐289  2018年01月 [査読有り][通常論文]
  
• Accessibility to Tertiary Stroke Centers in Hokkaido, Japan: Use of Novel Metrics to Assess Acute Stroke Care Quality

  Kensuke Fujiwara, Toshiya Osanai, Eiichi Kobayashi, Takumi Tanikawa, Ken Kazumata, Kikutaro Tokairin, Kiyohiro Houkin, Katsuhiko Ogasawara

  Journal of Stroke and Cerebrovascular Diseases 27 1 177 - 184 2018年01月 [査読有り][通常論文]
   

  © 2017 National Stroke Association. Background: Both the accessibility and availability of stroke specialists are major determinants of patient outcomes following acute ischemic stroke (AIS). The purpose of this study was to implement novel metrics to assess the accessibility of tertiary stroke centers as well as to evaluate regional disparities in stroke specialists. Methods: Using network analysis in a geographic information system, we calculated areas within 30- and 60-minute travel times to facilities providing intravenous recombinant tissue-type plasminogen activator and mechanical thrombectomy. We further evaluated the accessibility for the proportion of the population aged 65 years or older that resided outside of these areas. Uniformity in the geographical distribution of stroke specialists was then evaluated using optimal statistical analysis. Results: Accessibility varied widely from region to region, with low accessibility being concentrated in rural areas with low population density. Accessibility to facilities providing mechanical thrombectomy was especially low, and 17.8% of elderly individuals lived ≥60 minutes from treatment facilities. In addition, the distribution of stroke specialists was uneven compared with the distribution of hospital beds and full-time medical doctors. Conclusion: The results of this study revealed regional disparities in the spatial accessibility to treatment facilities, as well as in the distribution of stroke specialists in Hokkaido. These findings provide useful information that could be employed to appropriately allocate resources toward the formation of a medical supply system for patients with AIS.
• Willingness to Pay for Elderly Telecare Service Using the Internet and Digital Terrestrial Broadcasting

  Satoshi Kaga, Teppei Suzuki, Katsuhiko Ogasawara

  Interactive Journal of Medical Research 6 2 e21  {JMIR} Publications Inc. 2017年10月 [査読有り][通常論文]
   

  BACKGROUND: In Japan over the past few years, more attention has been focused on unnoticed solitary death in the context of an aging society and the trend toward nuclear family. A number of institutions and companies have implemented a prevention measure with digital terrestrial broadcasting telecare services for the elderly: Hokkaido University; TV-Asahi Corporation; Hitachi, Ltd; Iwamizawa City; Hokkaido Television Broadcasting Co, Ltd; and Hamanasu Information Co, Ltd. Although this system is provided free of charge as a demonstration test, determining the appropriate price for the service is required for its sustainable operation. OBJECTIVE: The aim of this study was to quantify individual willingness to pay (WTP) so as to test the tenability of digital terrestrial broadcasting service for elderly telecare. METHODS: We used the contingent valuation method (CVM) to estimate the WTP for this service among 305 citizens (valid response rate 76.0%) living in Japan. A questionnaire survey was conducted for people aged 18 to 100 years according to Japanese age distribution from September 2016. To elicit WTP, we adopted a double-bound dichotomous choice method to ask the respondents whether they agree or disagree with the price we offered. RESULTS: The median WTP for this service's monthly fee is estimated to be 431 JPY (approximately US $3.7). The finding suggests that gender (0.66, P=.01), health consciousness (1.08, P=.01), willingness to use (2.38, P<.001), and seeing others less than once a week (1.00, P=.06) made a positive effect on WTP. CONCLUSIONS: We conclude that reliable WTP was elicited by CVM based on an Internet survey. Calculated median WTP for digital terrestrial broadcasting service for elderly telecare was 431 JPY (approximately US $3.7). In the analysis of factors that affect WTP, constant factors, log-bid, health consciousness, gender, see others less than one time for week, and willingness to use made positive effect to probability of acceptance. In comparison of WTP in different groups, age groups showed that WTP of the elderly group was higher than WTP of the middle age group and younger age group. However, WTP surveys need to be carefully conducted to minimize the sampling bias and allocate accurate structure of gender distribution.
• Forecasting the regional distribution and sufficiency of physicians in Japan with a coupled system dynamics-geographic information system model

  Tomoki Ishikawa, Kensuke Fujiwara, Hisateru Ohba, Teppei Suzuki, Katsuhiko Ogasawara

  HUMAN RESOURCES FOR HEALTH 15 64 2017年09月 [査読有り][通常論文]
   

  Background: In Japan, the shortage of physicians has been recognized as a major medical issue. In our previous study, we reported that the absolute shortage will be resolved in the long term, but maldistribution among specialties will persist. To address regional shortage, several Japanese medical schools increased existing quota and established "regional quotas." This study aims to assist policy makers in designing effective policies; we built a model for forecasting physician numbers by region to evaluate future physician supply-demand balances. Methods: For our case study, we selected Hokkaido Prefecture in Japan, a region displaying disparities in healthcare services availability between urban and rural areas. We combined a system dynamics (SD) model with geographic information system (GIS) technology to analyze the dynamic change in spatial distribution of indicators. For Hokkaido overall and for each secondary medical service area (SMSA) within the prefecture, we analyzed the total number of practicing physicians. For evaluating absolute shortage and maldistribution, we calculated sufficiency levels and Gini coefficient. Our study covered the period 2010-2030 in 5-year increments. Results: According to our forecast, physician shortage in Hokkaido Prefecture will largely be resolved by 2020. Based on current policies, we forecast that four SMSAs in Hokkaido will continue to experience physician shortages past that date, but only one SMSA would still be understaffed in 2030. Conclusion: The results show the possibility that diminishing imbalances between SMSAs would not necessarily mean that regional maldistribution would be eliminated, as seen from the sufficiency levels of the various SMSAs. Urgent steps should be taken to place doctors in areas where our forecasting model predicts that physician shortages could occur in the future.
• コンジョイント分析法を用いた診療放射線技師の就労環境の選好に関わる要因分析

  藤原 健祐, 谷川原 綾子, 井上 剛, 北川 剛, 小笠原 克彦

  日本放射線技術学会雑誌 73 8 626 - 635 (公社)日本放射線技術学会 2017年08月
• Factors Affecting Bone Mineral Density Among Snowy Region Residents in Japan: Analysis Using Multiple Linear Regression and Bayesian Network Model (Preprint)

  Teppei Suzuki, Tomoko Shimoda, Noriko Takahashi, Kaori Tsutsumi, Mina Samukawa, Sadako Yoshimura, Katsuhiko Ogasawara

  {JMIR} Publications Inc. 2017年07月 [査読有り][通常論文]
  
• Relationship Using multiple linear regression analysis and Bayesian network model analysis of factors affecting bone mineral density of residents in snowy region of Japan

  2017年07月 [査読有り][通常論文]
  
• 領域制限法による北海道自治体病院の経営効率性評価

  佐々木健太, 石川 智基, 藤原 健祐, 谷 祐児, 小笠原克彦

  医療情報学 37 2 81 - 86 2017年04月 [査読有り][通常論文]
  
• Developing and Evaluating Radiotherapy Ordering System Applied JJ1017 Codes

  Shintaro Tsuji, Ayako Yagahara, Yamato Wakabayashi, Kenji Horita, Katsuhisa Fujita, Katsuhiko Ogasawara

  JOURNAL OF MEDICAL IMAGING AND HEALTH INFORMATICS 7 1 64 - 72 2017年02月 [査読有り][通常論文]
   

  Purpose: Purpose of this paper is to support oncologist's irradiation order entry narrowing down JJ1017 code values based on a radiotherapy prescriptions and to compare the predicted time of generating irradiation order applying GOMS (Goals, Operators, Methods, and Selection rules, hereinafter GOMS) models. Materials and Methods: Our study focused on the prescription of radiotherapy and the irradiation order that was implemented the JJ1017 codes. First, we clarified the common part between the prescription and JJ1017 codes. Second, the logic of narrowing down the irradiation order and the screen layout of the ordering system were constructed. Third, the current and previous system were applied GOMS model to calculate the predict time of ordering operation. Results: Three categories of JJ1017 codes were specified by the prescription of the radiotherapy. Those were the types of modality and the technique (major and minor classification). Comparing with two systems, the predicted time was reduced 38.33 sec (previous system) to 23.39 sec (current one), which was about 39% of simulation time. Conclusions: We developed the irradiation ordering system that specified JJ1017 codes using the prescription of radiotherapy. And By applying GOMS, this system improved about 39% of the operating time comparing with the previous one. The merits associated with capabilities for automation order entry through utilizing existing prescription information have been newly identified, wherein we conclude that such may provide for an opportunity to increase standard usage of JJ1017 code sets in the field of radiation therapy.
• Willingness to Pay for Elderly Tele-Care System Using Digital Terrestrial Broadcasting.

  Ogasawara Katsuhiko, Kaga Satoshi, Suzuki Teppei, Tani Yuji, Higashikawa Fumihiro, Enomoto Hisashi, Moriyama Hiroyuki, Kise Nobuyuki

  Studies in health technology and informatics 245 1366 - 1366 2017年 

  The aim of this research is to quantify individual willingness-to-pay (WTP) to test effectiveness of Digital terrestrial broadcasting elderly tele-care system.We used contingent valuation method (CVM) to estimate the WTP for this system among 400 citizens living in Japan. The median WTP for this services's monthly fee is estimated to be 431 JPY. The finding suggests that people who cares their health were pay more to use this system.
• 放射線技術学における研究倫理 臨床研究における倫理(2)

  西本 尚樹, 小笠原 克彦

  日本放射線技術学会雑誌 73 1 69 - 77 (公社)日本放射線技術学会 2017年01月
• 7．臨床研究における倫理(2)

  西本 尚樹, 小笠原 克彦

  日本放射線技術学会雑誌 73 1 69 - 77 公益社団法人 日本放射線技術学会 2017年
• Nutritional Status and Body Composition of Independently Living Older Adults in a Snowy Region of Japan

  Tomoko Shimoda, Teppei Suzuki, Noriko Takahashi, Kaori Tsutsumi, Mina Samukawa, Shoko Yoshimachi, Teruaki Goto, Hisashi Enomoto, Nobuyuki Kise, Katsuhiko Ogasawara, Sadako Yoshimura

  GERONTOLOGY AND GERIATRIC MEDICINE 3 2017年01月 

  Lifestyle diseases, which are associated with nutrition, account for 30% of elderly requiring long-term care. To increase health expectancy among Japan's rapidly aging population, we investigated the nutritional status and body composition of elderly adults living in a region subject to heavy snowfall, to identify pertinent health indicators. The dietary habits of 288 local residents aged >= 50 years were analyzed using body composition and a brief-type self-administered diet history questionnaire. Body mass index of all residents was normal. Basal metabolic rate (BMR) and muscle mass were reduced in the older group. Dietary habits did not differ with age among men, but older women had significantly higher dietary intake. BMR and muscle mass declined with age, even when dietary intake was sustained. Despite sufficient dietary intake, independently living older adults demonstrate less efficient use of food with age. Interventions to reduce excessive sodium and protein intake are required.
• 放射線技術学における研究倫理 臨床研究における倫理(1)

  西本 尚樹, 小笠原 克彦

  日本放射線技術学会雑誌 72 12 1268 - 1276 (公社)日本放射線技術学会 2016年12月
• Estimating the Duration of Public Concern After the Fukushima Dai-ichi Nuclear Power Station Accident from the Occurrence of Radiation Exposure-Related Terms on Twitter: A Retrospective Data Analysis

  Naoki Nishimoto, Mizuki Ota, Ayako Yagahara, Katsuhiko Ogasawara

  JMIR Public Health and Surveillance 2 2 e168  {JMIR} Publications Inc. 2016年11月 [査読有り][通常論文]
   

  BACKGROUND: After the Fukushima Dai-ichi Nuclear Power Station accident in Japan on March 11, 2011, a large number of comments, both positive and negative, were posted on social media. OBJECTIVE: The objective of this study was to clarify the characteristics of the trend in the number of tweets posted on Twitter, and to estimate how long public concern regarding the accident continued. We surveyed the attenuation period of the first term occurrence related to radiation exposure as a surrogate endpoint for the duration of concern. METHODS: We retrieved 18,891,284 tweets from Twitter data between March 11, 2011 and March 10, 2012, containing 143 variables in Japanese. We selected radiation, radioactive, Sievert (Sv), Becquerel (Bq), and gray (Gy) as keywords to estimate the attenuation period of public concern regarding radiation exposure. These data, formatted as comma-separated values, were transferred into a Statistical Analysis System (SAS) dataset for analysis, and survival analysis methodology was followed using the SAS LIFETEST procedure. This study was approved by the institutional review board of Hokkaido University and informed consent was waived. RESULTS: A Kaplan-Meier curve was used to show the rate of Twitter users posting a message after the accident that included one or more of the keywords. The term Sv occurred in tweets up to one year after the first tweet. Among the Twitter users studied, 75.32% (880,108/1,168,542) tweeted the word radioactive and 9.20% (107,522/1,168,542) tweeted the term Sv. The first reduction was observed within the first 7 days after March 11, 2011. The means and standard errors (SEs) of the duration from the first tweet on March 11, 2011 were 31.9 days (SE 0.096) for radioactive and 300.6 days (SE 0.181) for Sv. These keywords were still being used at the end of the study period. The mean attenuation period for radioactive was one month, and approximately one year for radiation and radiation units. The difference in mean duration between the keywords was attributed to the effect of mass media. Regularly posted messages, such as daily radiation dose reports, were relatively easy to detect from their time and formatted contents. The survival estimation indicated that public concern about the nuclear power plant accident remained after one year. CONCLUSIONS: Although the simple plot of the number of tweets did not show clear results, we estimated the mean attenuation period as approximately one month for the keyword radioactive, and found that the keywords were still being used in posts at the end of the study period. Further research is required to quantify the effect of other phrases in social media data. The results of this exploratory study should advance progress in influencing and quantifying the communication of risk.
• 北海道における放射線診療資源の地理的分布の経年比較 ジニ係数とハーフィンダール・ハーシュマン指数を用いた分析

  藤原 健祐, 谷川原 綾子, 谷川 琢海, 谷 祐児, 大場 久照, 小笠原 克彦

  日本放射線技術学会雑誌 72 10 970 - 977 (公社)日本放射線技術学会 2016年10月 

  北海道における放射線診療資源の地理的分布の経年比較について、ジニ係数(GC)とハーフィンダール・ハーシュマン指数(HHI)を用いて分析した。放射線診療資源は、放射線診療機器としてCT、MRI、放射線治療機器(RTF)、医療従事者として放射線診療機器の操作・管理を行う診療放射線技師(技師)を対象とした。1999年から2014年におけるGCの医師及びCTの変化量は微小であり分布に大きな変化はみられないが、MRI、RTF、技師のGCは低下し、特にRTFはその度合いが大きく不均一分布の改善傾向がみられた。いずれの年次においても医師のHHIは人口のHHIよりも高く、MRI、RTF、技師についても同様であり、都市部へ集中した。医師のみGCとHHIが共に上昇し、CT、MRI、RTF、技師はGCが低下しているもののHHIが上昇した。
• Problem-based learning for radiological technologists: a comparison of student attitudes toward plain radiography

  Takayoshi Terashita, Naomi Tamura, Kengo Kisa, Hidenobu Kawabata, Katsuhiko Ogasawara

  BMC MEDICAL EDUCATION 16 1 236  2016年09月 [査読有り][通常論文]
   

  Background: Knowledge and skill expected of healthcare providers continues to increase alongside developments in medicine and healthcare. Problem-based learning (PBL) is therefore increasingly necessary in training courses for radiological technologists. However, it is necessary to evaluate the effects of PBL to completely introduce it in our education programs. As a Hypothesis, it seems that a change occurs in the student's attitudes by participating in PBL practical training. There is the Semantic Differential (SeD) technique as a method to identify student's attitudes. We conceived that PBL could be appropriately evaluated by using SeD technique. In this paper, we evaluated PBL for plain radiography practical training using the SeD technique. Methods: Thirty-eight third-year students studying radiological technology participated. PBL was introduced to practical training in plain radiography positioning techniques. Five sessions lasting 5 h each were delivered over a 5-week period during November to December 2012. The clinical scenario was an emergency case with multiple trauma requiring plain radiography. Groups comprising approximately eight students created workflows for trauma radiography with consideration of diagnostic accuracy and patient safety. Furthermore, students groups conducted plain radiography on a patient phantom according to created workflows and were then guided by feedback from professional radiologists. All students answered SeD questionnaires to assess views on plain radiography before instruction to provide preliminary practical training reports and after completing practical training. Results: The factors were identified using factor analysis of the questionnaires, which were answered before and after each practical training session. On evaluation of the relationships between factors and question items according to factor loading, we identified "reluctance", "confidence", and "exhaustion" as the predominant attitudes before practical training. Similarly, we identified "expectation", "self-efficacy", and "realness" as the predominant attitudes after practical training. The attitudes toward plain radiography changed before and after PBL practical training. Conclusions: The attitude of self-efficacy was noted after practical training, which incorporated PBL. Student self-efficacy was thought to increase through self-directed learning, which is one of the aims of PBL. Although the influences of other lectures and training, which were performed in parallel with the PBL practice training, were not completely excluded, and although the number of study participants was small, we were able to confirm the effects of PBL.
• Behavioral Analysis of Visitors to a Medical Institution’s Website Using Markov Chain Monte Carlo Methods

  Teppei Suzuki, Yuji Tani, Katsuhiko Ogasawara

  Journal of Medical Internet Research 18 7 1 - 11 2016年07月 [査読有り][通常論文]
  
• Visualization of the X-ray Radiography Technical Process by Hierarchical Task Analysis

  Yuki Yokooka, Ayako Yagahara, Shintaro Tsuji, Naoki Nishimoto, Masahito Uesugi, Yasuo Okuda, Katsuhiko Ogasawara

  JOURNAL OF MEDICAL IMAGING AND HEALTH INFORMATICS 6 2 532 - 538 2016年04月 [査読有り][通常論文]
   

  Optimal X-ray images are obtained from correct image positioning by radiological technologists. However, guidance for new radiological technologists is not always adequate, and new methods are required for facilitating correct image positioning. In this study, we attempted to visualize and organize the skill of image positioning by radiological technologists using hierarchical task analysis (HTA). Regarding acquisition of frontal and lateral images of the wrist joint, cervical vertebrae, and elbow, knee, and ankle joints, the actions used to acquire images taken by a radiological technologist from initiation to completion of the process of each acquisition were regarded as the target range. The HTA included three hierarchies: the goal of acquisition as the highest hierarchy, tasks that were the minimum descriptions necessary for acquisition as the second hierarchy, and subtasks representing the concrete acquisition procedure as the lowest hierarchy. The total numbers of tasks and subtasks in all HTA constructions for the 10 goals were 85 and 226, respectively. Only the highest hierarchy was needed for skilled technologists, while the middle and lowest hierarchies were needed for beginning technologists. Therefore, visualization at different technical levels employing a single construction model may be possible. Our study presents effective expression of tacit knowledge for radiological technologists.
• A Study of a Development of Internal Exposure Management Tool Suited for Japanese Diet Behavior

  長谷川,慎, 奥,真也, 藤瀬,大助, 吉田,裕貴, 矢島,千秋, 奥田,保男, Schneider,Thierry, Lochard,Jacques, 川口,勇生, 栗原,治, 松本,雅紀, 青野,辰雄, 小笠原,克彦, 吉永,信治, 吉田,聡

  Radiological Issues for Fukushima’s Revitalized Future 221 - 232 2016年03月 [査読有り][通常論文]
   

  After the Fukushima Nuclear Power Plant accident, one of the main issues at stake was the potential intake of contaminated foodstuff by residents of the affected areas. In this context, the importance of the management of the internal exposure by food intake has emerged. For this purpose, a system was developed for estimating the amount of the radioactivity ingested through the diet in order to manage the internal exposure evolution of exposed people. The ultimate goal of this system is to consider all the radiation exposure data including medical exposure in an integrated manner. In this perspective, a tool that was used for internal exposure assessment in Europe after the Chernobyl disaster has been adapted to be suitable to Japanese diet behavior. The tool was implemented in a Web application in order to estimate the amount of radioactivity in the dish and to manage the internal exposure history of the individuals. This system automatically collects the test results of radionuclide in foods available on the web. It manages the individual internal exposure history estimating the amount of radioactivity in the ingested dish. The developed application enables individual to manage his/her protection by checking radioactivity ingestion history and determining to eat or not the dish according to the amount of radioactivity in the dish. This system, which has the potential to contribute to the radiation protection culture of people living in the contaminated areas of Fukushima Prefecture, has been evaluated by specialists of radiation protection. The following step will be the test of the system by the individuals themselves.
• 放射線技術学に関する用語集の日本語表記と意味記述に関する比較

  谷川原 綾子, 辻 真太朗, 福田 晋久, 西本 尚樹, 小笠原 克彦

  日本放射線技術学会雑誌 72 3 203 - 208 (公社)日本放射線技術学会 2016年03月 

  放射線技術学に関する用語集の日本語表記と意味記述について比較検討した。放射線技術学用語集(1994年)・放射線技術学用語集・補遺編(2003年)(JSRT用語集)、電子放射線診療用語集(JRS用語集)、医学物理学用語集(JSMP用語集)を用いた。JSRT用語集から5620表記、JRS用語集から6015表記、JSMP用語集から6829語、重複を除いて全14982語を抽出した。二つ以上の用語集で英語表記の一致が見られた用語は2735語(18.3%)、全ての用語集で一致した用語は801語(5.3%)であった。三つの用語集で英語表記が一致していた用語について、二つ以上の用語集で日本語表記が一致した用語は752語(93.9%)、二つ以上の用語集で英語表記が一致した用語では、1240語(64.1%)が日本語表記においても一致した。JSRT用語集、JRS用語集から英語表記が一致した1233語中、両方に意味が記述されていた用語は351語(28.5%)で、意味が異なった用語は8語あった。
• 特別豪雪地帯に住む高齢者の積雪時および非積雪時の活動量と体組成の実態調査

  下田 智子, 寒川 美奈, 小笠原 克彦, 良村 貞子

  日本未病システム学会学術総会抄録集 22回 131 - 131 (一社)日本未病学会 2015年09月
• Gd-EOB-DTPA造影MRI検査の大腸癌術前肝転移検索における効率の評価

  岩田 邦弘, 中川 貞裕, 森谷 俊春, 高瀬 崚研, 谷川 琢海, 小笠原 克彦

  日本放射線技術学会雑誌 71 9 833 - 833 (公社)日本放射線技術学会 2015年09月
• 医療機関Webサイトの医療情報充実度

  鈴木哲平, 佐々木彩乃, 林和輝, 谷川原綾子, 小笠原克彦

  医療情報学 3 35 133 - 140 2015年07月 [査読有り][通常論文]
  
• ARIMAモデルを利用した医療機器更新による収益性の検討

  谷 祐児, 佐瀬 雄治, 小笠原 克彦

  医療情報学 35 2 55 - 61 2015年06月 [査読有り][通常論文]
  
• 放射線技術分野への応用に向けたオントロジーの分類

  福田 晋久, 辻 真太朗, 谷川原 綾子, 西本 尚樹, 小笠原 克彦

  日本放射線技術学会雑誌 71 6 505 - 511 (公社)日本放射線技術学会 2015年06月
• 放射線技術学領域における用語オントロジーの構築に向けた分析

  辻 真太朗, 福田 晋久, 谷川原 綾子, 西本 尚樹, 本間 勝美, 小笠原 克彦

  日本放射線技術学会雑誌 71 3 186 - 193 (公社)日本放射線技術学会 2015年03月 

  放射線技術学分野の用語オントロジーの構築の検討を進めるため、学会名鑑に記載されている臨床医学、心理・教育学、総合工学の学会群を対象に、用語集の構築の有無を確認すると共に、各領域の用語集の特徴を比較した。各学会の公式ウェブサイトを検索した結果、用語集を構築しているのは臨床医学167学会中20学会、心理・教育学104学会中4学会、総合工学40学会中7学会であった。臨床医学分野の用語集は、他の分野と比較して電子媒体を中心とした用語集の電子化が進んでおり、閲覧者がPDFファイルとして入手することができ、日本語に対する英語の訳も記載されていた。一方課題として、電子媒体の用語集は収録語の増加に伴い検索・閲覧方法に限界があり、継続的なメンテナンスも容易ではなく、今後はオントロジー技術を利用することが必要と考えられた。
• [An analysis of existing terminology towards constructing ontology in the field of the radiological technology].

  Shintaro Tsuji, Akihisa Fukuda, Ayako Yagahara, Naoki Nishimoto, Katsumi Homma, Katsuhiko Ogasawara

  Nihon Hoshasen Gijutsu Gakkai zasshi 71 3 186 - 93 2015年03月 

  PURPOSE: In 1994, Japanese Society of Radiological Technology (JSRT) constructed the lexicon in the field of radiologic technology. However, recently, latest lexicon is not updated yet. The purpose of this article is to compare the terminologies in clinical medicine with the others and to consider reconstructing the lexicon in the radiological technology. MATERIALS AND METHODS: Our study selected three categories from the database of the academic society. These three groups were Clinical medicine (hereafter CM, 167 societies, includes JSRT), Psychology / Education (hereafter P/E, 104 societies), and Comprehensive synthetic engineering (hereafter CSE, 40 societies). First, all societies were surveyed to know whether there were any lexicon in their official website. Second, these terminologies were surveyed on the following criteria: (a) Media of lexicon, (b) Number of terms, (c) File type of lexicon, (d) Terms translated into English, (e) Way of searching terms, and (f) Number of committees of the terminology. RESULTS: Lexicon in CM, P/E, and CSE had 20, 4, and 7. Compared with P/E and CSE, CM showed the following trends: (a) used electronic media frequently, (b) stored large number of terms (about 5,000 to 11,000), (c) enabled to download frequently, and (d) used the alphabet and Japanese syllabary order frequently. CONCLUSIONS: Compared with the lexicon of P/E and CSE, terminology in CM tended to adopt the electronic media of lexicon and to have large number of terms. Additionally, many lexicons were expressed in English terms along with Japanese terms. Following massive lexicon of SNOMED-CT and RadLex, it is necessary to consider applying the web-based term searching and an ontological technique to the lexicon of radiological technology.
• 単純X線撮影のポジショニング実習における問題基盤型学習の導入と実践

  寺下貴美, 小笠原克彦

  日本放射線技術学会雑誌 71 3 216 - 221 2015年03月 [査読有り][通常論文]
  
• Development and current status of an advanced telehealth consultation system in Japan

  Tomoko Shimoda, Sadako Yoshimura, Yuko Yoshida, Mitsuhiro Okazaki, Teruaki Gotou, Shingo Tamura, Katsuhiko Ogasawara

  Journal of Telemedicine and Telecare 21 176 - 178 2015年01月01日 [査読無し][通常論文]
  
• 電子カルテにおける診療科ごとの記載内容の類似性についての検討

  鈴木 千裕, 佐久嶋 研, 南須原 康行, 遠藤 晃, 小笠原 克彦

  医療情報学連合大会論文集 34回 556 - 557 (一社)日本医療情報学会 2014年11月
• Adjustment of Gradation Characteristics in Chest Radiography Obtained by Two Computed Radiography Models Through Luminance Measurement

  Kazuhiro Ogasawara, Taketoshi Tsunemaru, Katsuhiko Ogasawara

  JOURNAL OF MEDICAL IMAGING AND HEALTH INFORMATICS 4 5 733 - 736 2014年10月 [査読有り][通常論文]
   

  The gradation characteristics and imaging techniques of computed radiography (CR) systems vary with the manufacturer. Consequently, there are differences in the obtained images, especially follow-up chest X-ray images. The conventional gradation measurement method has some disadvantage when the diagnosis is done on a monitor, and the aim of this study was the achievement of unification by aajusting the gradation of the measured luminance of the images displayed on the monitor, and by analysis of the receiver operating characteristic (ROC). An aluminum step wedge was exposed and the images were processed using two CR devices, namely FCR5501 and Regius190. Regius190 used three types of look-up tables (LUTs), namely THX-01, -02, and -07. From the luminance measurements of the images displayed on the monitor, we selected the LUT image of Regiusl 90 that was closest to the FCR5501 image. A chest phantom was photographed and the densities of the lung and mediastinum were set. The two images processed by Regius190 and FCR 5501 exhibited similar luminance characteristics, and we used the determined parameters to conduct visual assessments by ROC analysis. We demonstrated that it was possible to combine the gradation characteristics of entirely different systems. Our proposed luminance method is simple and effective and solves the problems of the traditional method.
• Semantic Differential法による態度測定指標の開発：診療放射線技術学科学生の持つＸ線撮影の概念の特定

  田村菜穂美, 寺下貴美, 小笠原克彦

  日本放射線技術学会雑誌 70 3 206 - 212 3 2014年03月 [査読有り][通常論文]
  
• 放射線技術学で必要な基礎統計学 まとめ データの品質と解析結果の解釈

  西本 尚樹, 大場 久照, 小笠原 克彦, 伊藤 陽一

  日本放射線技術学会雑誌 70 2 155 - 162 (公社)日本放射線技術学会 2014年02月
• 13．まとめ─データの品質と解析結果の解釈─

  西本 尚樹, 大場 久照, 小笠原 克彦, 伊藤 陽一

  日本放射線技術学会雑誌 70 2 155 - 162 Japanese Society of Radiological Technology 2014年
• The prognostic value of normal stress cardiovascular magnetic resonance imaging.

  岩田 邦弘, 中川 貞裕, 小笠原 克彦

  Journal of Computer Assisted Tomography 38 1 36 - 43 2014年01月 

  著者最終版OBJECTIVES:The purpose of our study was to determine the prognostic value of normal stress cardiovascular magnetic resonance imaging (CMR) by a systematic literature review and meta-analysis.METHODS:A comprehensive literature search of published studies through November 2011 in MEDLINE database and Cochrane Library, regarding prognostic value of stress CMR in patients with known or suspected coronary artery disease, was performed.RESULTS:Ultimately, we identified 11 studies. The summary relative risk ratio for major adverse cardiac events was 0.50 (95% confidence interval [CI], 0.44-0.58) for normal cine CMR and 0.09 (95% CI, 0.02-0.35) for normal perfusion CMR. The summary relative risk ratio for hard cardiac events was 0.36 (95% CI, 0.16-0.8) for normal cine CMR and 0.22 (95% CI, 0.07-0.66) for normal perfusion CMR.CONCLUSIONS:Normal stress CMR for patients known or suspected of having coronary artery disease has good prognostic value in predicting cardiac events.
• 仮想評価法を用いた3地域におけるドクターヘリの存続に対する支払意思額の比較

  横地将文, 寺下貴美, 小笠原克彦

  日本医療・病院管理学会誌 51 1 41 - 52 2014年01月 [査読有り][通常論文]
  
• 放射線技術学で必要な基礎統計学 サンプルサイズ

  谷 祐児, 大場 久照, 西本 尚樹, 小笠原 克彦, 伊藤 陽一

  日本放射線技術学会雑誌 69 12 1436 - 1443 (公社)日本放射線技術学会 2013年12月
• 信頼性の解析(κ係数とICC)

  西本 尚樹, 小笠原 克彦, 伊藤 陽一

  日本放射線技術學會雜誌 69 11 1320 - 1330 Japanese Society of Radiological Technology 2013年11月20日
• 形容詞を対象とした共起する用語の可視化 放射線治療のリスクと安全に関する文献のテキストマイニング

  安渡 大輔, 辻 真太朗, 谷川原 綾子, 福田 晋久, 本間 勝美, 小笠原 克彦

  北海道放射線技術雑誌 75 109 - 109 (公社)日本放射線技術学会-北海道支部 2013年10月
• 検査前有病率を考慮したMR elastographyの診断能評価 文献データを基にした判断分析を用いた検討

  岩田 邦弘, 谷川 琢海, 村上 昇, 鈴木 達也, 森谷 俊春, 小笠原 克彦

  日本放射線技術学会雑誌 69 9 1063 - 1063 (公社)日本放射線技術学会 2013年09月
• 多群の比較(3) : ノンパラメトリック検定

  谷川 琢海, 西本 尚樹, 小笠原 克彦, 伊藤 陽一

  日本放射線技術學會雜誌 69 8 885 - 894 Japanese Society of Radiological Technology 2013年08月20日
• Forecasting the absolute and relative shortage of physicians in Japan using a system dynamics model approach

  Ishikawa T, Yokooka Y, Nakamura K, Ohba H, Ogasawara K

  Human Resources for Health 11 41 2013年08月 [査読有り][通常論文]
  
• The Number of Japanese Radiological Technologist will be increased in 40 years

  Araseki M, Yokooka Y, Ishikawa T, Ogasawara K

  Radiological Physics and Technology 6 2 467 - 473 2013年07月 [査読有り][通常論文]
  
• 多群の比較(1)

  西本 尚樹, 小笠原 克彦, 伊藤 陽一

  日本放射線技術學會雜誌 69 6 679 - 688 Japanese Society of Radiological Technology 2013年06月20日
• 放射線技術学で必要な基礎統計学 2群の比較(4)

  谷川原 綾子, 西本 尚樹, 小笠原 克彦, 伊藤 陽一

  日本放射線技術学会雑誌 69 5 568 - 574 (公社)日本放射線技術学会 2013年05月
• 2群の比較(2)

  西本 尚樹, 小笠原 克彦, 伊藤 陽一

  日本放射線技術學會雜誌 69 2 208 - 216 Japanese Society of Radiological Technology 2013年02月20日
• 2群の比較(1)

  横岡 由姫, 西本 尚樹, 小笠原 克彦, 伊藤 陽一

  日本放射線技術學會雜誌 69 1 114 - 122 Japanese Society of Radiological Technology 2013年01月20日
• 12．サンプルサイズ

  谷 祐児, 大場 久照, 西本 尚樹, 小笠原 克彦, 伊藤 陽一

  日本放射線技術学会雑誌 69 12 1436 - 1443 Japanese Society of Radiological Technology 2013年
• Analysis of hospital function for neuronal and circulatory diseases in secondary medical service areas in Hokkaido

  Katsuhiko Ogasawara, Ryoya Asaoka, Yuji Sase, Tomoki Ishikawa, Kenji Fujimori

  Globalism and Regional Economy 195 - 208 2013年01月01日 [査読有り][通常論文]
  
• 北海道における小児の医療施設へのアクセスの不平等性評価の試み

  桑原 智美, 寺下 貴美, 石川 智基, 小笠原 克彦

  北海道公衆衛生学会雑誌 26 2 75 - 79 2013年 [査読有り][通常論文]
  
• 放射線部門における自己回帰和分移動平均(ARIMA)モデル構築による業務データ分析の試み

  谷 祐児, 小笠原 克彦

  日本放射線技術學會雜誌 68 10 1314 - 1326 Japanese Society of Radiological Technology 2012年10月20日 

  This study aimed to contribute to the management of a healthcare organization by providing management information using time-series analysis of business data accumulated in the hospital information system, which has not been utilized thus far. In this study, we examined the performance of the prediction method using the auto-regressive integrated moving-average (ARIMA) model, using the business data obtained at the Radiology Department. We made the model using the data used for analysis, which was the number of radiological examinations in the past 9 years, and we predicted the number of radiological examinations in the last 1 year. Then, we compared the actual value with the forecast value. We were able to establish that the performance prediction method was simple and cost-effective by using free software. In addition, we were able to build the simple model by pre-processing the removal of trend components using the data. The difference between predicted values and actual values was 10%; however, it was more important to understand the chronological change rather than the individual time-series values. Furthermore, our method was highly versatile and adaptable compared to the general time-series data. Therefore, different healthcare organizations can use our method for the analysis and forecasting of their business data.
• 研究デザイン

  西本 尚樹, 小笠原 克彦, 伊藤 陽一

  日本放射線技術學會雜誌 68 10 1392 - 1400 Japanese Society of Radiological Technology 2012年10月20日
• How much is the labour load of a filmless system in radiology?

  Hiroshi Muto, Takumi Tanikawa, Takayoshi Terashita, Katsuhiko Ogasawara

  Journal of Hostpital Administration 1 1 30 - 35 2012年09月 [査読無し][通常論文]
  
• 医療統計学概論

  西本 尚樹, 小笠原 克彦, 伊藤 陽一

  日本放射線技術學會雜誌 68 8 1038 - 1045 Japanese Society of Radiological Technology 2012年08月20日
• Geographical distribution of radiotherapy resources in Japan: investigating the inequitable distribution of human resources by using the Gini coefficient.

  Takumi Tanikawa, Hisateru Ohba, Katsuhiko Ogasawara, Yasuo Okuda, Yutaka Ando

  Journal of radiation research 53 3 489 - 91 2012年 

  This is a pilot study that aims to elucidate regional disparities in the distribution of medical resources in Japan. For this purpose, we employed the Gini coefficient (GC) in order to analyze the distribution of radiotherapy resources, which are allocated to each prefecture in Japan depending on the size of its population or physical area. Our study used data obtained from the 2005 and 2007 national surveys on the structure of radiation oncology in Japan, conducted by the Japanese Society for Therapeutic Radiology and Oncology (JASTRO). Our analysis showed that the regional disparities regarding the radiation oncologists and radiotherapy technologists were small, and concluded that such resources were almost equitably distributed. However, medical physicists are inequitably distributed. Thus, policymakers should create and implement measures to train and retain medical physicists in areas with limited radiotherapy resources. Further, almost 26% of the secondary medical service areas lacked radiotherapy institutions. We attribute this observation to the existence of tertiary medical service areas, and almost all of prefectures face a shortage of such resources. Therefore, patients' accessibility to these resources in such areas should be improved.
• 北海道大学大学院保健科学院社会医療情報(小笠原)研究室(医療情報分野の教育機関,施設紹介Virtual Interview第21回)

  小笠原 克彦

  日本放射線技術学会医療情報分科会雑誌 19 43 - 47 公益社団法人 日本放射線技術学会 2012年
• ドクターヘリの費用便益分析を目的とした仮想評価法の適用性における検討

  横地 将文, 寺下 貴美, 小笠原 克彦

  日本航空医療学会雑誌 12 3 10 - 19 日本航空医療学会 2012年01月 [査読無し][通常論文]
   

  本研究ではドクターヘリの費用便益分析を行う事を最終目標とする。本研究では便益をドクターヘリに関する支払意思額とした。支払意思額の測定には仮想評価法を用いるが、質問紙で行うため事前調査が必要となる。本稿ではドクターヘリにおける仮想評価法の適用性を検討し報告する。質問対象者は札幌市から半径70km圏の住民とした。質問紙には背景・事実記述と仮想状態としてドクターヘリが廃止された場合の変化を記載した。金額の質問は税金による徴収と寄付金による徴収を用意し、16通りの選択肢から選ばせた。調査はインターネットで行った。分析は量的分析と質的分析を行った。結果は400人中366人から回答を得た（有効回答率91.5%）。支払意思額は税金が1,363円、寄付金が1,703円となり、有意差はなかった。支払意思額に影響を与える要因には、年齢、家族構成、職業、年収、ドクターヘリを知ったきっかけがあった。
• Filmless versus film-based systems in radiographic examination costs: an activity-based costing method

  Hiroshi Muto, Yuji Tani, Shigemasa Suzuki, Yuki Yokooka, Tamotsu Abe, Yuji Sase, Takayoshi Terashita, Katsuhiko Ogasawara

  BMC HEALTH SERVICES RESEARCH 11 11. 10.1186/1472-6963-11-246  2011年09月 [査読無し][通常論文]
   

  Background: Since the shift from a radiographic film-based system to that of a filmless system, the change in radiographic examination costs and costs structure have been undetermined. The activity-based costing (ABC) method measures the cost and performance of activities, resources, and cost objects. The purpose of this study is to identify the cost structure of a radiographic examination comparing a filmless system to that of a film-based system using the ABC method. Methods: We calculated the costs of radiographic examinations for both a filmless and a film-based system, and assessed the costs or cost components by simulating radiographic examinations in a health clinic. The cost objects of the radiographic examinations included lumbar (six views), knee (three views), wrist (two views), and other. Indirect costs were allocated to cost objects using the ABC method. Results: The costs of a radiographic examination using a filmless system are as follows: lumbar 2,085 yen; knee 1,599 yen; wrist 1,165 yen; and other 1,641 yen. The costs for a film-based system are: lumbar 3,407 yen; knee 2,257 yen; wrist 1,602 yen; and other 2,521 yen. The primary activities were "calling patient," "explanation of scan," " take photographs," and "aftercare" for both filmless and film-based systems. The cost of these activities cost represented 36.0% of the total cost for a filmless system and 23.6% of a film-based system. Conclusions: The costs of radiographic examinations using a filmless system and a film-based system were calculated using the ABC method. Our results provide clear evidence that the filmless
• Development of terminology for mammographic techniques for radiological technologists

  Ayako Yagahara, Yuki Yokooka, Shintaro Tsuji, Naoki Nishimoto, Masahito Uesugi, Hiroshi Muto, Hisateru Ohba, Kunio Kurowarabi, Katsuhiko Ogasawara

  Radiological Physics and Technology 4 2 121 - 127 2011年07月 [査読無し][通常論文]
   

  We are developing a mammographic ontology to share knowledge of the mammographic domain for radiologic technologists, with the aim of improving mammographic techniques. As a first step in constructing the ontology, we used mammography reference books to establish mammographic terminology for identifying currently available knowledge. This study proceeded in three steps: (1) determination of the domain and scope of the terminology, (2) lexical extraction, and (3) construction of hierarchical structures. We extracted terms mainly from three reference books and constructed the hierarchical structures manually. We compared features of the terms extracted from the three reference books. We constructed a terminology consisting of 440 subclasses grouped into 19 top-level classes: anatomic entity, image quality factor, findings, material, risk, breast, histological classification of breast tumors, role, foreign body, mammographic technique, physics, purpose of mammography examination, explanation of mammography examination, image development, abbreviation, quality control, equipment, interpretation, and evaluation of clinical imaging. The number of terms that occurred in the subclasses varied depending on which reference book was used. We developed a terminology of mammographic techniques for radiologic technologists consisting of 440 terms. © 2011 Japanese Society of Radiological Technology and Japan Society of Medical Physics.
• 医療機関における診療放射線技師への医療情報教育に関する調査

  池田龍二, 小笠原克彦, 奥田保男, 小西康彦, 大場久照, 星野修平, 細羽実

  日本放射線技術学会雑誌 67 5 541 - 548 Japanese Society of Radiological Technology 2011年 [査読無し][通常論文]
   

  Recently, the importance of medical information for radiologic technologists has increased. The purpose of this questionnaire survey was to clarify the method of acquiring skill in medical information for radiologic technologists from the point of view of the managers of radiology departments. The questionnaire was sent to 260 hospitals that had introduced picture archiving and communication systems (PACSs) for the person responsible for medical information in the radiology department. The response rate was 35.4% (92 hospitals). The results of this survey clarified that few hospital have staff for medical information in the radiology department. Nevertheless, the excellent staff who have the skills to troubleshoot and develop systems are earnestly needed in radiology departments. To solve this problem, many technologists should understand the content, work load, and necessity of medical information. In addition, cooperation between radiologic technologist schools and hospitals is important in the field of medical information education.
• アクティビティ図を用いた気管内吸引技術の可視化

  コリー 紀代, 本田 千積, 阿部 保, 小笠原 克彦

  医工学治療 23 1 22 - 33 日本医工学治療学会 2011年 [査読無し][通常論文]
   

  家族や社会福祉サービスの力を借りながら、人工呼吸器をつけた個人が在宅で過ごすことは、以前ほど珍しいことではなくなった。しかしながら、既存の社会福祉サービスでは、提供できるサービス内容に限界があるため家族に負担が強いられ、結果的に家族のパ-ンアウトや人工呼吸器をつけた児の事故も報告されている。 そのような状況の中、一定の条件付きで医師・看護師以外の者による気管内吸引の実施が認められる方向に進んでいるが、気管内吸引の実施には、高いリスクがあるということも事実である。近年の気管内吸引技術に関する論文を見てみると、気管内吸引自体の手順や方法の相違から生じるリスクに関して分析した文献はほとんど見当たらない。そのため本調査では、アクティビティ図を用いて気管内吸引技術を可視化し、気管内吸引技術の類似点・相違点について比較した。その結果、3つの気管内吸引方法に共通するリスクと各方法に特異的なリスクがあった。
• Quantitative evaluation of expression difference in report assignments between nursing and radiologic technology departments

  Naoki Nishimoto, Yuki Yokooka, Ayako Yagahara, Masahito Uesugi, Katsuhiko Ogasawara

  Radiological Physics and Technology 4 1 29 - 36 2011年01月 [査読無し][通常論文]
   

  Our purpose in this study was to investigate the expression differences in report assignments between students in nursing and radiologic technology departments. We have known that faculties could identify differences, such as word usage, through grading their students' assignments. However, there are no reports in the literature dealing with expression differences in vocabulary usage in medical informatics education based on statistical techniques or other quantitative measures. The report assignment asked for students' opinions in the event that they found a rare case of a disease in a hospital after they graduated from professional school. We processed student report data automatically, and we applied the space vector model and TF/IDF (term frequency/inverse document frequency) scoring to 129 report assignments. The similarity-score distributions among the assignments for these two departments were close to normal. We focused on the sets of terms that occurred exclusively in either department. For terms such as "radiation therapy" or "communication skills" that occurred in the radiologic technology department, the TF/IDF score was 8.01. The same score was obtained for terms such as "privacy guidelines" or "consent of patients" that occurred in the nursing department. These results will help faculties to provide a better education based on identified expression differences from students' background knowledge. © 2010 Japanese Society of Radiological Technology and Japan Society of Medical Physics.
• Willingness to pay for municipality hospital services in rural Japan: A contingent valuation study

  Takayoshi Terashita, Hiroshi Muto, Toshihito Nakamura, Katsuhiko Ogasawara, Masaji Maezawa

  BMC Research Notes 4 10.1186/1756-0500-4-177  2011年 [査読無し][通常論文]
   

  Background: The Japanese healthcare system has undergone reforms to address the struggles that municipality hospitals face. Reform guidelines clearly define criteria for administrative improvement. However, criteria to evaluate the demand for healthcare provisions in rural Japan, including the needs of rural residents for municipality hospitals in particular have not been specified. The purpose of this paper is to measure residents' willingness to pay (WTP) for municipality hospital services using the contingent valuation method, and to evaluate municipality hospital valuation on the basis of WTP. K town, located in the Hokkaido prefecture of Japan, was selected as the location for this study. Participants were recruited by a town hall healthcare administrator, hospital and clinic staff, and a local dentist. Participants were asked what amount they would be willing to pay as taxes to continue accessing the services of the municipality hospital for one year by using open-ended questions in face-to-face interviews. Findings. Forty-eight residents were initially recruited, and 40 participants were selected for the study (response rate 83%). As compared to K town's population, this data slanted toward the elderly, although there was no significant difference in frequency among the characteristics. The median WTP was estimated at 39,484 yen ($438.71), with a 95% confidence interval 27,806-55,437 yen ($308.95-615.96). Logistic regression revealed no significant factors affecting WTP. Conclusions: If the total amount of residents' WTP for the municipality hospital were to be estimated by this result, it would calculate with 129,586,000 yen ($1,439,844). This is approximately equal to the amount of money to be transferred from the general account of the government of K town, more than one-half of the town tax of K town, and about two-fold in comparison to Japan as a whole. This showed that K town's residents placed a high valuation on the municipality hospital, which nearly equalled the amount that the K town government provided to the municipality hospital to cover its annual deficit. K town residents had come to expect not only general clinical practice, but also emergency medical services and night practice provided by their own town's municipality hospital. WTP can be used as a measure of hospital evaluation because it reflects the importance of the hospital to the residents in its region. © 2011 Terashita et al licensee BioMed Central Ltd.
• Quantitative analysis of ontology research articles in the radiologic domain

  Naoki Nishimoto, Ayako Yagahara, Yuki Yokooka, Shintaro Tsuji, Masahito Uesugi, Katsuhiko Ogasawara, Masaji Maezawa

  Radiological Physics and Technology 3 2 171 - 177 2010年07月 [査読有り][通常論文]
   

  To investigate the most advanced ontology research in health care and its impact on the radiologic domain, we proposed a concept identification and abstraction technique called "Concept Step". This technique identifies a MeSH term, medical subject headings used in PubMed, in a sentence and climbs up through its hierarchy to reach an abstract concept. We developed original Java software to implement this technique. We tested it on 2,774 abstracts in health-care ontology research retrieved from MEDLINE on 23 October 2008. The total number of MeSH terms was 112,690. We counted a total of 33 MeSH terms (0.029%) in the radiologic domain. The most frequently occurring term was "radiology", which occurred 21 times in the article set. Other frequent terms were "magnetic resonance imaging" and "tomography", the counts of which were 4 and 3, respectively. A pair plot showed no correlation among the MeSH categories "Analytical Diagnostic and Therapeutic Techniques and Equipment", "Anatomy", "Biological Sciences", and "Chemicals and Drugs". We conclude that ontology research is well established in the biomedical domain, and that further study is required in the radiologic domain. © 2010 Japanese Society of Radiological Technology and Japan Society of Medical Physics.
• 小児の初期救急医療における遠隔コンサルテーション利用の支払意思額－仮想評価法(CVM)による保護者を対象とした意識調査－

  谷川 琢海, 大場 久照, 小笠原 克彦, 櫻井 恒太郎

  日本医療・病院管理学会誌 47 2 25 - 36 (一社)日本医療・病院管理学会 2010年 [査読無し][通常論文]
   

  時間外診療を含む小児初期救急医療に対して、遠隔医療システムを導入することに対する地域住民の需要を明らかにすることを目的に、子供の保護者を対象に仮想評価法(CVM)を適用したアンケート調査を行い、遠隔医療システムを利用する場合の支払意思額(WTP)の評価を行った。アンケート調査は、北海道の岩見沢市と南富良野町で実施した。幼稚園と保育所に通う3歳から5歳までの子供のいる503世帯の保護者を対象とした。医療資源への移動距離によるWTPの有意差は認めず、遠隔コンサルテーションシステムの需要が医療機関までの距離に依存しないことが示唆された。回答者属性による比較では、子供の人数が1人の群、所得の多い群、遠隔医療の知識がある群においてWTPが高い傾向が示唆された。
• 全国の診療放射線技師養成機関における医療情報教育に関する調査研究

  大場久照, 小笠原克彦, 星野修平, 細羽実, 奥田保男, 小西康彦, 池田龍二

  日本放射線技術学会雑誌 66 8 911 - 916 日本放射線技術学会 2010年 [査読無し][通常論文]
   

  The purpose of this study was to clarify actual conditions and problems in medical information education and to propose the educational concept to be adopted in medical information. A questionnaire survey was carried out by the anonymous method in June 2008. The survey was intended for 40 radiological technology schools. The questionnaire items were as follows: (1) educational environment in medical information education, (2) content of a lecture in medical information, (3) problems in medical information education. The response rate was 55.0% (22 schools). Half of the responding schools had a laboratory on medical information. Seventeen schools had a medical information education facility, and out of them, approximately 50% had an educational medical information system. The main problems of the medical information education were as follows: (a) motivation of the students is low, (b) the educational coverage and level for medical information are uncertain, (c) there are not an appropriate textbook and educational guidance. In conclusion, these findings suggest that it is necessary to have a vision of medical information education in the education of radiological technologists.
• 放射線技術者のための医用言語処理入門-part 4-(用語解説)

  西本 尚樹, 上杉 正人, 櫻井 恒太郎, 小笠原 克彦

  日本放射線技術学会医療情報分科会雑誌 12 77 - 82 公益社団法人 日本放射線技術学会 2009年
• Changing Trends in Birthday Preference: Long-Range Data Analysis of Several Specific Days Registered in Hospital Information Systems

  Tanikawa Takumi, Ogasawara Katsuhiko, Sakurai Tsunetaro

  医療情報学 28 6 319 - 327 Japan Association for Medical Informatics 2009年 [査読無し][通常論文]
   

  The purpose of this study was to clarify the factors related to the deviation of the birth dates in Japan. The deviation of birth dates for several specific days was analyzed by some 580,000 patient's birthday data registered in the hospital information system. We analyzed the deviation of the birth dates on the following specific days: (1) New Year's day and the first day of a month; (2) lucky and unlucky days based on the lunar calendar; and (3) weekends and holidays. In the past, the number of births on New Year's Day and the first day of a month were greater than the average day of the year. These deviations were disappeared at present. In recent years, there were few births on Saturdays and Sundays. The result of this study showed that the factitious reporting was caused to the deviation of the birth dates on the first half of the 20th century. Nowadays the obstetric interventions was affected the deviation of birth dates. It was concluded that the deviation of the number of births always reflected social factors.
• 一対比較法を用いた保護者の小児救急医療機関の選好度の分析

  谷川琢海、大場久照、小笠原克彦、櫻井恒太郎

  日本医療・病院管理学会誌 46 4 231 - 239 (一社)日本医療・病院管理学会 2009年 [査読無し][通常論文]
   

  地域住民の小児救急医療施設の選好度を明らかにするため、一対比較法を用いたアンケート調査により病院の選択要因の重要度を評価した。子供が急病である時の病院の選択要因を七つ設定し、各二つの選択要因のうちどちらが、どれだけ重要であるか尋ねた。対象は幼稚園に通う子供の保護者とし、153部を配布して73通の有効回答を得た。その結果、保護者は小児救急医療機関を選択する際、小児科の医師がいることを他の要因と比較して重要であると考えていた。小児科までの移動距離を重要と考える傾向は弱かったが、医療機関の近隣に住む住民は小児科までの距離が遠くなることに対して抵抗感があることが示唆された。また安心感に関わる選択要因の重要度が高く、地域の小児科開業医や総合診療医との医療連携体制の構築など、保護者に安心感を提供する施策が必要と思われる。
• 北海道におけるドクターへリの費用効果分析の試み-外傷患者における救急車搬送された場合に仮定される死亡者定数を用いたシミュレーション

  日本医療・病院管理学会誌 46 241 - 250 2009年 [査読有り][通常論文]
  
• Interpretive Structural Modeling(ISM法)による乳房撮影技術の構造化

  工藤希美, 工藤希美, 黒蕨邦夫, 寺下貴美, 西本尚樹, 小笠原克彦

  日本放射線技術学会雑誌 65 10 1385 - 1390 2009年 [査読有り][通常論文]
  
• 医学論文抄録を対象とした略語表現自動抽出アルゴリズムの構築と評価

  若生理佳, 西本尚樹, 上杉正人, 寺下貴美, 小笠原克彦

  日本放射線技術学会雑誌 65 8 1025 - 1031 日本放射線技術学会 2009年 [査読有り][通常論文]
   

  The purpose of this study was to develop an automated acquisition support for the semantics of abbreviations and evaluate its performance with respect to academic articles. Our goal was to support the maintenance of an institution-specific semantics inventory for abbreviations on a continuous basis. We retrieved articles from MEDLINE with the keyword "Liver [MeSH]," and 100 abstracts were randomly selected. Abbreviations and their full forms were retrieved using original Java software based on the following rules. (1) Searching the parentheses in the abstracts, the words inside the parentheses were retrieved as "INNER" and the words in front of the parentheses were retrieved as "OUTER." (2) Matching rules, such as whether the first characters of INNER and OUTER were the same. (3) If the words satisfied the conditions stated at (2), INNER was saved as the abbreviation and OUTER as the full form. Performance was manually evaluated by two graduate students and a radiologist. Of the 165 pairs of abbreviations and full forms that were obtained, 145 (87.9%) constituted correct matches.
• 放射線技術者のための医用言語処理入門(用語解説)

  上杉 正人, 西本 尚樹, 櫻井 恒太郎, 小笠原 克彦

  日本放射線技術学会医療情報分科会雑誌 11 71 - 76 公益社団法人 日本放射線技術学会 2008年
• 医療技術者のための医用言語処理入門(用語解説)

  西本 尚樹, 上杉 正人, 櫻井 恒太郎, 小笠原 克彦

  日本放射線技術学会医療情報分科会雑誌 10 46 - 52 公益社団法人 日本放射線技術学会 2008年
• 重力モデルによる患者受療動向の分析－北海道二次医療圏を対象とした５年間推移－

  石塚 和也, 寺下 貴美, 大場 久照, 谷川 琢海, 小笠原 克彦

  日本医療・病院管理学会誌 45 4 43 - 52 (一社)日本医療・病院管理学会 2008年 [査読有り][通常論文]
   

  患者の受療動向を二次医療圏の病院数および二次医療圏間の距離を用いた重力モデルにより説明できる。北海道における患者受療動向の変化、医療資源の適正配置のための計画・立案のために、二次医療圏21圏域を対象に平成12年と17年の分析結果を比較した。5年の間、主に道東地域の二次医療圏には変化がなく、入院・外来とも「需要が満たされておらず、移動を負担に感じる地域」に分類された。入院患者を対象とした分析では、上川北部、上川中部は「需要が満たされており、移動が負担にならない地域」から「その他の地域」に移行した。外来患者を対象とした分析では、宗谷、南渡島は「その他の地域」から「需要が満たされており、移動が負担にならない地域」に移行した。また、5年間の変化はベクトル図からも把握でき、道東地域はほとんど変化がなく、上川北部は入院・外来とも規模依存度係数・距離係数ともに悪化傾向に、北渡島檜山では外来において規模依存度係数・距離係数ともに改善傾向にあった。この研究により二次医療圏ごとの将来的な変化の可能性を視覚的に示すことができた。
• 移動選好指数を用いた受療動向の評価に関する基礎的研究

  大場 久照, 谷川 琢海, 小笠原 克彦

  日本医療・病院管理学会誌 45 4 53 - 64 (一社)日本医療・病院管理学会 2008年 [査読有り][通常論文]
   

  移動選好指数(MPI)を用い、北海道の二次医療圏21圏域を対象に、患者の受療動向に対する地域的な選好度を評価した。札幌圏では、入院での流出圏にMPIが100を越える医療圏はなかったが、流入圏では20医療圏中12医療圏でMPIが100を越えた。外来での流出圏は「南空知」1圏域のみであったが、流入圏は11医療圏で、近隣圏域だけでなく、「宗谷」「留萌」等、三次医療圏外のMPIも高かった。上川中部圏では、流出圏は、入院・外来とも「北空知」のMPIが高かった。流入圏は、入院・外来とも三次医療圏域でMPIが顕著に高かった。また、流出MPIと流出率とを比べると、選好度と流出圏が異なる結果となった。MPIにより、患者の特定の医療圏への選好度や患者移動圏を定量的に評価できた。新しい医療計画に沿った年齢階級別、疾患別・診療科別の評価も加え、MPIによる受療動向の分析手法確立の可能性が示唆された。
• 心筋血流MRIと心筋血流SPECTの冠動脈病変に対する診断能の比較 : メタアナリシスによる検討

  岩田 邦弘, 窪田 誠, 小笠原 克彦

  日本放射線技術学会雑誌 64 2 251 - 258 日本放射線技術学会 = Japanese Society of Radiological Technology 2008年 [査読無し][通常論文]
   

  We compared the diagnostic abilities of stress myocardial perfusion MRI (myocardial perfusion MRI) and myocardial perfusion SPECT, using a meta-analysis method. We investigated the diagnostic abilities of MRI and SPECT in similar subject groups in reports written in English or Japanese. The reports to be used for analysis were selected according to a "screening standard," which was established in advance. After consolidating the data from the selected reports, we compared (1) the integrated odds ratio, (2) the point estimation values of sensibility/specificity, and (3) the summary ROC curve. For the analysis, six reports were selected (subjects: 153, coronary-artery target sites: 447). Meta-analysis revealed that the diagnostic ability of myocardial perfusion MRI was superior to that of myocardial perfusion SPECT regarding each of the parameters (1)-(3). This is considered to be supportive evidence of the usefulness of myocardial perfusion MRI.
• 階層分析法とシミュレーションによるCRシステム導入の評価要因の検討

  横岡 由姫, 小笠原 克彦

  日本放射線技術学会雑誌 64 9 1167 - 1171 日本放射線技術学会 = Japanese Society of Radiological Technology 2008年 [査読無し][通常論文]
   

  Medical institutions usually find it difficult to select computed radiography (CR) equipment because of the involvement of many complicated factors such as operability, processing time, and price. The analytic hierarchy process (AHP) is often applied in complex decision and evaluation situations. This study quantitatively evaluates the institution's selection criteria of equipment using AHP. The AHP model of this study consisted of 3 levels: the goal, 6 evaluations, and 3 alternatives. Processing time, price operability, picture quality, connectivity, and equipment size were considered as the criteria for decision marking. We simulated alteration of priority of evaluations by changing the weight of pricing between 0 and 1. Results showed that price and connectivity accounted for 60% of the total weight. On excluding operability, the difference in weight between equipment was 1.16 times; the priority of processing time was 1.36 times; and the priority of price was 1.37 times. In the same way, when considering operability, the difference in weight between equipment was 0.36 times, the priority of processing time was 0.45 times, and the priority of price was 0.11 times.
• 形態素解析における放射線技術学分野の用語適用-診療放射線技師試験を対象とした未知語の調査-

  辻 真太朗, 西本 尚樹, 小笠原 克彦

  日本放射線技術学会雑誌 64 7 791 - 794 日本放射線技術学会 = Japanese Society of Radiological Technology 2008年 [査読無し][通常論文]
   

  Although large medical texts are stored in electronic format, they are seldom reused because of the difficulty of processing narrative texts by computer. Morphological analysis is a key technology for extracting medical terms correctly and automatically. This process parses a sentence into its smallest unit, the morpheme. Phrases consisting of two or more technical terms, however, cause morphological analysis software to fail in parsing the sentence and output unprocessed terms as "unknown words." The purpose of this study was to reduce the number of unknown words in medical narrative text processing. The results of parsing the text with additional dictionaries were compared with the analysis of the number of unknown words in the national examination for radiologists. The ratio of unknown words was reduced 1.0% to 0.36% by adding terminologies of radiological technology, MeSH, and ICD-10 labels. The terminology of radiological technology was the most effective resource, being reduced by 0.62%. This result clearly showed the necessity of additional dictionary selection and trends in unknown words. The potential for this investigation is to make available a large body of clinical information that would otherwise be inaccessible for applications other than manual health care review by personnel.
• Development of a Medical-text Parsing Algorithm Based on Character Adjacent Probability Distribution for Japanese Radiology Reports

  N. Nishimoto, S. Terae, M. Uesugi, K. Ogasawara, T. Sakurai

  METHODS OF INFORMATION IN MEDICINE 47 6 513 - 521 2008年 [査読無し][通常論文]
   

  Objectives: The objectives of this study were to investigate the transitional probability distribution of medical term boundaries between characters and to develop a parsing algorithm specifically for medical texts. Methods: Medical terms in Japanese computed tomography (CT) reports were identified using the ChaSen morphological analysis system. MeSH-based medical terms (51,385 entries), obtained from the metathesaurus in the Unified Medical Language System (UMLS, 2005AA), were added as a medical dictionary for ChaSen. A radiographer corrected the set of results containing 300 poised CT reports. In addition, two radiologists checked the medical term parsing of 200 CT sentences. Results: We obtained modified inter-annotator agreement scores for the text corrected by the radiologists. We retrieved the transitional probability as the conditional probability of a uni-gram, bi-gram, and tri-gram. The highest transitional probability P(Ci | Ci - 2*Ci - 1) was 1.00. For an example of anatomical location, the term "pulmonary hilum" was poised as a tri-gram. Conclusions: Retrieval of transitional probability will improve the accuracy of parsing compound medical terms.
• 医療技術者のための医用言語処理入門(用語解説)

  西本 尚樹, 上杉 正人, 櫻井 恒太郎, 小笠原 克彦

  日本放射線技術学会医療情報分科会雑誌 9 59 - 67 公益社団法人 日本放射線技術学会 2007年
• 最大エントロピー法によるセグメント時系列解析を用いたタイムスタディ解析の評価 - シミュレーションデータと実データの比較 -

  寺下 貴美, 佐藤 ひとみ, 遠藤 晃, 石井 英樹, 上杉 正人, 西本 尚樹, 谷川 琢海, 孫 芹先, 小笠原 克彦, 櫻井 恒太郎

  医療情報学 25 3 289 - 296 日本医療情報学会 2007年 [査読無し][通常論文]
   

  我々はこれまでに，看護師のタイムスタディデータより新たな情報を抽出することを目的として，業務の周期に着目して時系列データに周波数解析を行い看護業務に内在する周期的特徴を抽出し報告した．今回我々は特定の業務が時間的に連続しているかまたは分散しているかを想定したシミュレーションデータを作成して同様の解析を行った．この結果を基に，実際の業務改善の前後に行ったタイムスタディの分析結果を比較することにより，この分析手法が業務改善の評価に有効であるかどうかを検討した．シミュレーションデータは1分単位で記録された実際の業務の項目別の量に基づいて作成した．セグメント時系列解析はシミュレーションデータ，実データともにセグメント区間を24時間（1,440点），セグメントのシフトを1時間（60点）として2日分（2,880点）のデータに対し行った．パワースペクトルの算出には最大エントロピー法を用いた．シミュレーションデータの分析の結果，得られた周期は短周期領域と中・長周期領域に分けられ，短周期領域では周期の変化を詳細に認識することができ，中・長周期領域では中・長期の傾向として認識することができるなど，想定した病棟での業務の連続化を反映する変化を読み取ることができた．時間的な集中や分散を目的とする業務改善の場合，業務改善前後に収集したタイムスタディを本法で解析し比較することで，業務の変更による周期的な変化を視覚的に観察することが可能である．今後，この分析手法は業務変化の影響を観察するシミュレータとして応用を拡大することも期待できる．
• An ontological approach to support the description of nursing practice in Japan with the ICNP

  Guoqian Jiang, Hitomi Sato, Akira Endoh, Katsuhiko Ogasawara, Tsunetaro Sakurai

  INTERNATIONAL JOURNAL OF MEDICAL INFORMATICS 76 1 55 - 65 2007年01月 [査読無し][通常論文]
   

  Background: With increasing computerization of nursing records in Japan, standardization of nursing terminology is becoming imperative. Although some efforts have been made to formalize description of nursing practice in Japan with the International Classification of Nursing Practice (ICNP), lack of effective description tools has impacted negatively on the initiatives. Purpose: To develop and evaluate an ontological approach that could be used to facilitate the description of nursing practice in Japan with the ICNP. Methodology: An ontology-based support system was developed using Protege-2000, mainly by the following three steps: (1) representing a standard classification of nursing practice (the Nursing Master) in Japan; (2) representing a Japanese version of the ICNP; (3) designing an ontology-based framework. A heuristic matching algorithm was developed to automatically match the action labels in the Nursing Master with the terms of the eight axes of the ICNP Nursing Actions Classification. A preliminary evaluation was performed to examine the usefulness of the system. Results: High hit rate was shown on the ICNP axes Action type, Target, and Location. The evaluation indicated that 51.7 +/- 5.8% (mean +/- S.D.) of the action labels with only one action type were properly matched, and that in 80 +/- 4% (mean +/- S.D.) of action labels with more than one action type, at least one valid action type was matched correctly. Conclusion: The ontology-based approach using a frame-based knowledge representation system (e.g., Protege-2000) is useful for supporting the formal description of nursing practice in Japan with the ICNP. (c) 2006 Elsevier Ireland Ltd. All rights reserved.
• Cost-utility of living donor liver transplantation in a single Japanese center

  Kozo Ishida, Hirohisa Imai, Katsuhiko Ogasawara, Kuniko Hagiwara, Satoru Todo, Hiroyuki Furukawa, Hiroyoshi Fujita, Tsunetaro Sakurai, Hiko Tamashiro

  HEPATO-GASTROENTEROLOGY 53 70 588 - 591 2006年07月 [査読無し][通常論文]
   

  Background Aims: Living donor liver transplantation is becoming increasingly important in the Western world, but the economic issues remain controversial. We conducted a cost-utility analysis to evaluate whether living donor liver transplantation is cost-effective. Methodology: Cost and utility analyses were performed in a longitudinal survey of a single center in Sapporo, Japan. Medical costs were derived from 11 patients who underwent living donor liver transplantation. Health utility was measured in quality-adjusted life year. Data for health utility scores were derived from 19 patients who under-went living donor liver transplantation. Results: Median medical cost was US$154,626 from the first day of preoperative evaluation to 24 months post-transplantation. Cumulative quality-adjusted life years were 1.60 at 24 months after transplantation. Medical cost per quality-adjusted life year decreased progressively, leading to medical cost of US$605,131 per quality-adjusted life year at 3 months to US$94,169 at 24 months after transplantation. The results were sensitive to medical cost. Conclusions: Follow-up survey identified progressive increases in the cost-effectiveness of living donor liver transplantation for patients with end-stage liver disease. Living donor liver transplantation appears to represent a cost-effective medical technology.
• 医療機関を対象とした放射線安全管理体制に関する調査研究－第2報 測定, 校正および点検について

  大場 久照, 小笠原 克彦, 油野 民雄

  日本放射線技術学会雑誌 62 1 86 - 94 日本放射線技術学会 = Japanese Society of Radiological Technology 2006年 [査読無し][通常論文]
   

  We carried out a questionnaire survey to determine the actual situation of radiation safety management measures in all medical institutions in Japan that had nuclear medicine facilities. The questionnaire consisted of questions concerning the evaluation of shielding capacity; radiation measurement; periodic checks of installations, equipment, and protection instruments; and the calibration of radiation survey meters. The analysis was undertaken according to region, type of establishment, and number of beds. The overall response rate was 60 percent. For the evaluation of shielding capacity, the outsourcing rate was 53 percent of the total. For the radiation measurements of "leakage radiation dose and radioactive contamination" and "contamination of radioactive substances in the air," the outsourcing rates were 28 percent and 35 percent of the total, respectively (p<0.001, according to region and establishment). For the periodic check of radiation protection instruments, the implementation rate was 98 percent, and the outsourcing rate was 32 percent for radiation survey meters and 47 percent for lead aprons. The non-implemented rate for calibration of radiation survey meters was 25 percent of the total (p<0.001, according to region and establishment). The outsourcing rate for calibration of radiation survey meters accounted for 87 percent of the total, and of these medical institutions, 72 percent undertook annual calibration. The implementation rate for patient exposure measurement was 20 percent of the total (p<0.001, according to number of beds), and of these medical institutions 46 percent recorded measurement outcome.
• 空間的相互作用モデルとGISを用いた受療行動モデルの構築と空間的分析－北海道における遠隔医療整備のために

  大場 久照, 小笠原 克彦, 谷川 琢海, 櫻井 恒太郎

  医療情報学 25 5 309 - 321 Japan Association for Medical Informatics 2006年 [査読無し][通常論文]
   

  我々は，北海道において遠隔医療を優先的に整備すべき二次医療圏を明らかにするために，空間的相互作用モデル族の一つである発生量制約モデルを用いて二次医療圏間の受療行動モデルを構築し，地理情報システム（GIS）により受療行動の空間的分析を行った．データ分析には平成12年5月診療分国保患者受療動向調査結果を用い，対象患者数は入院79,458人，外来1,402,231人とした．受療行動のモデル化に際し，重回帰分析により病院数による規模依存係数βおよび患者の距離係数γの各パラメータを求めた．2パラメータの全道平均値を基準として4分類化した患者移動特性を交通網および地勢とともにGIS上に示した．その結果，モデルの自由度調整済み決定係数は入院0.754，外来0.819とともに高く，北海道における受療行動は病院数と二次医療圏間の距離で概ね説明できた．遠隔医療の必要性の高い医療圏は北海道東部の二次医療圏に多いことが明らかになった．
• ミニ・サム型施設配置モデルを用いた救急医療器官の最適配置の分析－北海道の小児急病センターの配置を事例として

  谷川琢海, 小笠原克彦, 大場久照, 櫻井恒太郎

  病院管理 43 3 249 - 260 (一社)日本医療・病院管理学会 2006年 [査読無し][通常論文]
   

  患者となる小児人口と移動距離を用いて小児急病センターの適切な数と配置を明らかにする目的で,オペレーションズ・リサーチ手法であるミニ・サム型施設配置モデルを適用して分析を行った.北海道を対象地域として一次医療圏(212市町村)を単位とした場合に患者の居住地から施設までの総移動距離が最小となるような施設の配置場所と各施設が受け持つ圏域を求めた.現在の三次医療圏の中心となる市(6ヶ所)に施設を配置した場合と現在の二次医療圏の中心となる市町(21ヶ所)に施設を配置した場合の妥当性及び施設の総数を変化させた場合の数と配置の関係について検討した.その結果,現在の医療圏の設定に基づいた小児急病医療体制の構築は患者の移動負担の観点から妥当でないことが示唆された.以上より,今後の小児の医療計画の構築に際しては,小児に特化した圏域の設定が必要であることが示唆され,平均移動距離,最大移動距離,各施設の受け持つ小児人口が施設を配置するため重要な指標となるものと考えられた
• CＴ画像診断レポートに出現する複合語の意味的な分布の調査

  医療情報学 25 413 - 420 2005年 [査読無し][通常論文]
  
• 医療情報学受講前の情報リテラシーの学科間相違に関する考察－医学科・看護学科・診療放射線技術学科学生を対象とした7年間の継続調査結果

  小笠原克彦

  医療情報学 25 1 7 - 13 2005年 [査読無し][通常論文]
  
• 医療機関を対象とした放射線安全管理体制に関する調査研究－第1報 放射線取扱主任者、安全管理組織および教育訓練について

  大場 久照, 小笠原 克彦, 油野 民雄

  日本放射線技術学会雑誌 61 11 1542 - 1550 日本放射線技術学会 = Japanese Society of Radiological Technology 2005年 [査読無し][通常論文]
   

  In this study, a questionnaire survey was carried out to determine the actual situation of radiation safety management systems in Japanese medical institutions with nuclear medicine facilities. The questionnaire consisted of questions concerning the Radiation Protection Supervisor license, safety management organizations, and problems related to education and training in safety management. Analysis was conducted according to region, type of establishment, and number of beds. The overall response rate was 60%, and no significant difference in response rate was found among regions. Medical institutions that performed nuclear medicine practices without a radiologist participating accounted for 10% of the total. Medical institutions where nurses gave patients intravenous injections of radiopharmaceuticals as part of the nuclear medicine practices accounted for 28% of the total. Of these medical institutions, 59% provided education and training in safety management for nurses. The rate of acquisition of Radiation Protection Supervisor licenses was approximately 70% for radiological technologists and approximately 20% for physicians (regional difference, p=0.02). The rate of medical institutions with safety management organizations was 71% of the total. Among the medical institutions (n=208) without safety management organizations, approximately 56% had 300 beds or fewer. In addition, it became clear that 35% of quasi-public organizations and 44% of private organizations did not provide education and training in safety management (p<0.001, according to establishment).
• 肝臓移植の医療経済学評価における文献的考察

  日本公衆衛生雑誌 51 233 - 239 2004年 [査読無し][通常論文]
  
• Webを利用した放射性医薬品管理システムの構築と評価. 日本放射線技術学会雑誌

  寺下 貴美, 中場 貴紀, 布施 善弘, 小笠原 克彦

  日本放射線技術学会雑誌 60 6 811 - 817 日本放射線技術学会 = Japanese Society of Radiological Technology 2004年 [査読無し][通常論文]
   

  診療用放射線の防護に関して,医療法施行規則の一部を改正する省令が関係告示とともに公布され,平成13年4月1日から施行された.さらに,国際放射線防護委員会(ICRP)1990年勧告の取り入れにより空気中,排気中,排水中の放射性同位元素の濃度限度が改められ,新濃度限度に対応した算定法が通知された.これらにより医療現場における放射性同位元素の使用実態に則したものとなったが,新法令への移行には煩雑で実務的な処理を伴っているのが現状である.当院では平成12年6月より医療情報システムの開発会社(ベンダー)に依らずに単独でWorld Wide Web(以下,WWW)を用いたシステム(以下, Webシステム)による患者情報システム,入院患者台帳システム,DICOM Imagingシステム,検査オーダ・エントリ・システムを開発し運用している.特に,検査オーダ・エントリ・システムではモダリティごとの検査依頼,照射録等の作成・管理などを運用している.法改正に伴い当院でも新濃度評価の下で記録簿様式の変更が必要となった.そこでわれわれは業務の簡素化を図るため,放射性医薬品の入荷・使用・在庫・調剤・廃棄・帳票等の管理を一括して行うことを目的としたシステムの開発を行った.今回,当院で運用しているWebシステムを拡張し,患者情報と検査内容のデータが共有できる放射性医薬品管理システムを構築したので報告する.
• Radiological equipment and staffs distribution in Hokkaido area, Japan –Lorenz curve and Gini coefficient analyses

  小笠原 克彦, 南部 敏和, 桜井 恒太郎

  医療経済研究 14 17 - 26 医療経済研究機構 2004年 [査読無し][通常論文]
  
• 診療放射線技師教育医療機関を対象とした放射線安全管理学教育に関する調査研究

  大場 久照, 小笠原 克彦, 油野 民雄

  日本放射線技術学会雑誌 60 10 1415 - 1423 日本放射線技術学会 = Japanese Society of Radiological Technology 2004年 [査読無し][通常論文]
   

  We carried out a questionnaire survey of all radiological technology schools, to investigate the status of radiation safety education. The questionnaire consisted of questions concerning full-time teachers, measures being taken for the Radiation Protection Supervisor Qualifying Examination, equipment available for radiation safety education, radiation safety education for other departments, curriculum of radiation safety education, and related problems. The returned questionnaires were analyzed according to different groups categorized by form of education and type of establishment. The overall response rate was 55%, and there were statistically significant differences in the response rates among the different forms of education. No statistically significant differences were found in the items relating to full-time teachers, measures for Radiation Protection Supervisor Qualifying Examination, and radiation safety education for other departments, either for the form of education or type of establishment. Queries on the equipment used for radiation safety education revealed a statistically significant difference in unsealed radioisotope institutes among the forms of education. In terms of curriculum, the percentage of radiological technology schools which dealt with neither the shielding calculation method for radiation facilities nor with the control of medical waste was found to be approximately 10%. Other educational problems that were indicated included shortages of full-time teachers and equipment for radiation safety education. In the future, in order to improve radiation safety education at radiological technology schools, we consider it necessary to develop unsealed radioisotope institutes, to appoint more full-time teachers, and to educate students about risk communication.
• ストマップ理解のためのトレーニング用胃ファントム

  西本 尚樹, 堀田 賢治, 細井 智宏, 小笠原 克彦

  日本放射線技術学会雑誌 59 10 1303 - 1308 (公社)日本放射線技術学会 2003年10月 

  胃の三次元的な解剖の理解を向上させることを目的として,ストマップを展開した安価で簡便なトレーニング用胃ファントムを開発した.ストマップを展開した胃ファントムが,材料費のみでおよそ1万円,製作期間は35時間程度と簡便に製作することが可能であった.胃バリウム撮影の経験が殆どない学生を対象とした評価実験の結果,ストマップを展開した胃ファントムを使用することにより,胃の解剖の立体的な把握を促すことが可能であった.胃ファントムにストマップを展開する際,線の太さや材質の選択,接着する時期の検討の必要性が明らかになった
• Context-based ontology building support in clinical domains using format concept analysis

  GQ Jiang, K Ogasawara, A Endoh, T Sakurai

  INTERNATIONAL JOURNAL OF MEDICAL INFORMATICS 71 1 71 - 81 2003年08月 [査読無し][通常論文]
   

  Objective: Ontology in clinical domains is becoming a core research field in the realm of medical informatics. The objective of this study is to explore the potential role of format concept analysis (FCA) in a context-based ontology building support in a clinical domain (e.g. cardiovascular medicine here). Methodology: We developed an ontology building support system that integrated an FCA module with a natural language processing (NLP) module. The user interface of the system was developed as a Protege-2000 JAVA tab plug-in. A collection of 368 textual discharge summaries and a standard dictionary of Japanese diagnostic terms (MEDIS ver2.0) were used as the main knowledge sources. A preliminary evaluation was taken to show the usefulness of the system. Results: Stability was shown on the MEDIS-based medical concept extraction with high precision. 73+/-14% (mean+/-S.D.) of the compound medical phrases extracted were sufficiently meaningful to form a medical concept from a clinical perspective. Also, 57.7% of attribute implication pairs (i.e. medical concept pairs) extracted were identified as positive from a clinical perspective. Conclusion: Under the framework of our ontology building support system using FCA, the clinical experts could reach a mass of both linguistic information and context-based knowledge that was demonstrated as useful to support their ontology building tasks. (C) 2003 Elsevier Ireland Ltd. All rights reserved.
• 簡易型動画像伝送システム実用化の検討2－患家での使用に関する評価－

  北海道リハビリテーション学会雑誌 31 97 - 101 2003年 [査読無し][通常論文]
  
• 簡易型動画像伝送システム実用化の検討1－システム構築と基本性能評価－

  北海道リハビリテーション学会雑誌 31 91 - 96 2003年 [査読無し][通常論文]
  
• Preliminary clinical evaluation of a video transmission system for home visits

  K Ogasawara, K Ito, GQ Jiang, A Endoh, T Sakurai, H Sato, Y Okuhara, T Adachi, K Hori

  JOURNAL OF TELEMEDICINE AND TELECARE 9 5 292 - 295 2003年 [査読無し][通常論文]
   

  A portable video transmission system based on a hand-held computer and cellular telephone was developed for use with patients undergoing rehabilitation at home. It was designed to be simple to operate, for use by nurses on home care visits. The whole system can be held in one hand, and video pictures can be recorded and transmitted with the touch of a few buttons. The quality of the transmitted pictures and the feasibility of the system were clinically evaluated by physical therapists and nurses. Three image transmission scenes were used to evaluate the system: turning over in bed; walking; and raising and lowering a shoulder. Nurses reported that the system was easy to carry and simple to use. Physiotherapists found the system to be useful in making a judgement about the patient's condition. The patients were all enthusiastic about the system. The increased interaction had the effect of improving the patients' desire to continue their in-home rehabilitation.
• テレ・ラジオロジーに関する診療放射線技師の意識－北海道における医療圏・年齢層・施設規模別の調査研究

  小笠原 克彦

  日本放射線技術学会雑誌 59 9 1147 - 1154 日本放射線技術学会 = Japanese Society of Radiological Technology 2003年 [査読無し][通常論文]
   

  A questionnaire survey was given to 1,951 radiological technologists in Hokkaido to examine their views on teleradiology. The questionnaire consisted of questions about their understanding of teleradiology and interest in it as well as examining the need for teleradiology and problems with it. A total of 1,275 radiological technologists responded to the survey, a response rate of 65.4%. The returned questionnaires were analyzed according to different groups categorized by age of the radiological technologists and type of medical facility. Almost all radiological technologists knew about teleradiology. Among the different age groups, the higher age groups showed greater recognition and understanding of teleradiology. About 60% of radiological technologists were interested in teleradiology (no significant differences among age groups). When it was assumed that a teleradiology system would be introduced, (1) the working load for radiological technologists was estimated to be about 17,820 (±24,233) yen per month. (2) Sixty percent of the respondents considered that the system should be used for the reading and diagnosis of difficult cases. (3) Fifty percent of them thought that the system should be managed and operated by radiological technologists. (4) Many radiological technologists pointed out problems concerning initial costs and the facility's management system.
• 病変の立体的位置把握のための胃ファントムの開発

  日本放射線技術学会雑誌 59 1303 - 1308 2003年 [査読無し][通常論文]
  
• 撮影技術学実習に取り入れた高齢者・片麻痺疑似体験の教育効果

  日本放射線技術学会雑誌 59 295 - 301 2003年 [査読無し][通常論文]
  
• Interpretive Structural Modeling for introducing of image information system at the middle-scale hospitals.

  Katsuhiko Ogasawara, Hiroko Yamashina, Tomoko Kamiya, Guoqian Jiang, Tsunetaro Sakurai

  AMIA 2003(AMIA) 2003年
• Comparison of computer-based information support to clinical research in hospitals between China and Japan: A postal survey of clinician’s views

  G Jiang, K Ogasawara, A Endoh, T Sakurai

  Method of Informatics in Medicine 41 2 141 - 146 2002年 [査読無し][通常論文]
   

  Objectives: The objectives of this research are to examine the current situation of computer-based information support of clinical research in hospitals and to determine the expectations of clinicians toward clinical research support functions of hospital information systems (HISS) in both China and Japan. Methods: 172 clinicians from 42 major hospitals in China (2 groups), and 568 clinicians from 79 university hospitals in Japan (2 groups), were surveyed by postal questionnaire during July and August, 1999. The Kruskal-Wallis test was performed to analyze the differences among the groups. Results: The total response rate was 66.9%. The result shows that 94.8% of the Japanese clinicians, 3.5 times more than those in China, use computers almost every day. High significance was shown for the frequency of non-HIS based information resources used by clinicians between China and Japan (p < 0.001), whereas no significance for the frequency of HIS use by clinicians between the China I and Japan I groups (p = 0.725) was found. 33.3% clinicians in China thought they could obtain 30-50% of the necessary patient data for clinical research from the HIS, about 2 times more than in Japan (p = 0.009). Conclusions: Although the degree of computer involvement among clinicians in Japan is much higher than in China, the computer-based hospital information systems have not been developed well for supporting clinical research in both countries. The clinicians expect comprehensive computerized patient records (CPRs) and full use of patient related information in the existing HISS to support their clinical research.
• What do radiographers think about teleradiology in Japan?

  K Ogasawara, A Endoh, T Sakurai

  JOURNAL OF TELEMEDICINE AND TELECARE 7 3 161 - 166 2001年 [査読無し][通常論文]
   

  In order to understand radiographers' views of teleradiology, we sent questionnaires to all radiographers in Hokkaido, japan. Questions concerned the understanding of, interest in, need for and problems related to teleradiology. A total of 1275 radiographers responded to the survey (a response rate of 65%). Almost all had heard about teleradiology and about 60% of them were interested in it. However, fewer radiographers working in the central region than in other regions expected to be involved in teleradiology. If teleradiology were to be introduced, 60% of the respondents thought that it should be used for interpreting difficult cases and 30% for emergency cases. Half thought that the system should be managed and operated by the radiographer. Thirty-seven per cent of radiographers expected that there would be problems concerning the management of the system within one facility and between facilities, and 34% predicted problems with the installation costs.
• A Numerical Model of Compressed Breast of the Japanese women in Mammography

  OGASAWARA K, DATE H

  医学物理 21 4 215 - 222 一般社団法人 日本医学物理学会 2001年 [査読無し][通常論文]
   

  The purpose of this study is to develop a numerical model for compressed breast of Japanese women which can evaluate the radiation dose in mammography. The model should take account of the average data for thickness of the compressed breast, and area, height and width of the mammograms. The compressed breast thickness is typically 4.4 to 6.4cm for European and American women, whereas it is under 3.8cm for Japanese women. Therefore, applying the European and American models without any modification for Japanese women would result in an overestimation of the absorbed dose. The data of 560 mammograms were analyzed focusing on the size and geometry of the projected images (cranio-caudal) to formulate a compressed breast phantom. An extremely good linear coefficient of correlation (0.98) between the area and the product of the width and height of the projected images was found. A numerical model describing a part of a simple elliptic column was constructed from this relationship and the averaged thickness (3.15cm) of the compressed breast. This model will lead to a realistic estimation of the total volumetric absorbed dose in mammography.
• 学生実習に取り入れた病院サービス調査の試み

  小笠原 克彦, 遠藤 晃, 佐藤 ひとみ, 寺江 聡, 櫻井 恒太郎

  医学教育 31 1 23 - 28 日本医学教育学会 2000年 [査読無し][通常論文]
  
• ホームページによる市民向けHIV/AIDS診療・療養情報の提供の試み

  医療情報学 20 55 - 60 2000年 [査読無し][通常論文]
  
• 診療放射線技術学教育における問題解決型演習の試み

  小笠原 克彦, 遠藤 晃, 伊達 広行, 櫻井 恒太郎, 下妻 光夫

  日本放射線技術学会雑誌 56 4 596 - 604 公益社団法人 日本放射線技術学会 2000年 [査読無し][通常論文]
   

  The importance of informatics in the education of medical and nursing students has been widely recognized in recent years, and many curricula in information literacy have been proposed. Students of radiological technology, as well as other medical students, need these curricula. We had the opportunity to teach "Practice in Radiation Protection" to junior and senior students, and to use problem-solving group learning. This course consisted of 13 sessions. The contents included introductory lectures on informatics, the critical reading of an epidemiological paper written in English, and a problem-solving exercise carried out in a small group setting. In the exercise, students chose one theme related to medical informatics, health science, or radiation protection. After collecting information on this theme, they presented a report to the class. A questionnaire given to students after the course work had finished pointed to certain problems. These problems included difficulty in being able to read the English paper, group work, and insufficient time for the exercise. Ninety-percent of the students reported that they had gained a positive attitude toward problem solving as a result of the exercise.
• 消化器検診施設における画像情報保管に関する一考察－フィルム保管と電子媒体保管の比較

  小笠原 克彦, 安藤 裕, 斎藤 正道, 板垣 佑司, 渡辺 一知, 遠藤 晃, 櫻井 恒太郎

  日本総合健診医学会会誌 27 4 409 - 414 2000年 [査読無し][通常論文]
  
• 新入生を対象とした問題解決型「情報管理学」の提案

  小笠原克彦

  医療情報学 19 1 19 - 26 1999年 [査読無し][通常論文]
  
• 階層分析法による高濃度検診用バリウム製剤とその選択基準に関する検討

  小笠原 克彦, 高橋 秀樹, 平川 昌, 斉藤 正道

  日本放射線技術学会雑誌 55 4 392 - 396 公益社団法人 日本放射線技術学会 1999年 [査読無し][通常論文]
  
• 圧縮画像と非圧縮画像のフィルム読影とCRT読影の診断能 -腹部CTのSOLについて

  小笠原 克彦, 前田 知穂, 紀ノ定 保臣, 安藤 裕, 塚本 信宏, 川口 修, 北村 正幸, 国枝 悦夫, 久保 敦司, 小塚 隆弘

  日本医学放射線学会雑誌 59 11 521 - 525 日本医学放射線学会 1999年 [査読無し][通常論文]
  
• Simultaneous acquisition of iodine-123 emission and technetium-99m transmission data for quantitative brain single-photon emission tomographic imaging

  Katsuhiko Ogasawara, Jun Hashimoto, Koichi Ogawa, Atsushi Kubo, Nobutoku Motomura, Hyoji Hasegawa, Takashi Ichihara

  European Journal of Nuclear Medicine 25 11 1537 - 1544 1998年 [査読無し][通常論文]
   

  The aim of this study was to obtain quantitative iodine-123 brain single-photon emission tomographic (SPET) images with scatter and attenuation correction. We used a triple-headed SPET gamma camera system equipped with fan-beam collimators with a technetium-99m line transmission source placed at one of the focal lines of the fan-beam collimators. Four energy windows were employed for data acquisition: (a) 126-132 keV, (b) 132-143 keV, (c) 143-175 keV and (d) 175-186 keV. A simultaneous transmission-emission computed tomography scan (TCT-ECT) was carried out for a brain phantom containing 123I solution. The triple energy window scatter correction was applied to the 123I ECT data measured by means of the windows (b), (c) and (d) acquired by two detectors. Attenuation maps were reconstructed from 99mTc TCT data measured by means of the windows (a), (b) and (c) acquired by one detector. Chang's iterative attenuation correction method using the attenuation maps was applied to the 123I ECT images. In the phantom study cross-calibrated SPET values obtained with the simultaneous mode were almost equal to those obtained with the sequential mode, and they were close to the true value, within an error range of 5.5%. In the human study corrected images showed a higher grey-to-white matter count ratio and relatively higher uptake in the cerebellum, basal ganglia and thalamus than uncorrected images. We conclude that this correction method provides improved quantification and quality of SPET images and that the method is clinically practical because it requires only a single scan with a 99mTc external source.

その他活動・業績

• 膀胱癌術後患者における日本語版Body Image Scaleの信頼性と妥当性の検証

  樋口 まどか, 佐藤 三穂, 大澤 崇宏, 山田 修平, 宮田 遥, 松本 隆児, 田中 博, 佐々木 芳浩, 森田 研, 原林 透, 柏木 明, 村井 祥代, 安部 崇重, 小笠原 克彦, 篠原 信雄 泌尿器外科 36 (臨増) 886 -886 2023年08月
• 【医療AIの普及拡大とさらなる展開 医療からヘルスケアサービスまで発展に向けた現状と展望】医療AIのための人材育成の現状と展望 北海道大学における医療AI開発者育成プログラムの活動と展望

  唐 明輝, 平田 健司, 杉森 博行, 吉村 高明, 小笠原 克彦, 中谷 純, 工藤 與亮 INNERVISION 38 (7) 19 -20 2023年06月 

  わが国においては高齢化,医療者の偏在,働き方改革など,多くの医療課題が山積みになっている。それらの課題を解決するため,医療AIの導入および展開が喫緊の課題となっている。そのような背景で,東北大学を主幹に,北海道大学と岡山大学が連携する医療AI人材育成プロジェクト「『Global×Localな医療課題解決を目指した最先端AI研究開発』人材育成教育拠点」が,文部科学省・大学教育再生戦略推進費「保健医療分野におけるAI研究開発加速に向けた人材養成産学協働プロジェクト」に採択された[2020(令和2)～2024(令和6)年度]。北海道大学では,大学院医学研究院連携研究センター医療AI教育研究分野を中心に,東北大学および岡山大学と連携し,協力校である北海道情報大学,北海道科学大学とともに,民間企業や自治体の支援を受けながら,多様性に富んだ事業推進体制による医療AI開発者養成プログラム(Clinical AI Human Resources Development Program:CLAP)を2021(令和3)年度から本格的に展開し始めた。(著者抄録)
• 日本語版Body Image Scaleの膀胱癌術後患者における信頼性・妥当性の検証

  樋口 まどか, 佐藤 三穂, 大澤 崇宏, 山田 修平, 宮田 遥, 菊地 央, 松本 隆児, 三浪 圭太, 田中 博, 佐々木 芳浩, 森田 研, 高田 徳容, 原林 透, 古御堂 純, 柏木 明, 村井 祥代, 安部 崇重, 小笠原 克彦, 篠原 信雄 泌尿器外科 36 (5) 417 -417 2023年05月
• 北海道における訪問看護サービスの地理的アクセシビリティについて 在宅医療圏別の評価

  大橋 和貴, 藤原 健祐, 谷川 琢海, 坂東 恭平, 森井 康博, 小笠原 克彦 医療情報学連合大会論文集 42回 771 -772 2022年11月
• 北海道における一次脳卒中センターの均てん化シミュレーション

  坂東 恭平, 大橋 和貴, 藤原 健祐, 谷川 琢海, 長内 俊也, 小笠原 克彦 医療情報学連合大会論文集 42回 777 -778 2022年11月
• 急性期脳梗塞患者の搬送方法が治療へのアクセシビリティに及ぼす影響 地理情報システムを用いたシミュレーション

  森井 康博, 長内 俊也, 藤原 健祐, 高宮 宗一朗, 坂東 恭平, 谷川 琢海, 谷 祐児, 佐藤 広崇, 大橋 和貴, 石川 智基, 小笠原 克彦 医療情報学連合大会論文集 42回 779 -780 2022年11月
• The health economic effects of an imaging technology–based telemedicine system for rural neuro-emergency patient care

  Hirotaka Sato, Manabu Kinoshita, Yuji Tani, Teruo Kimura, Toshiya Osanai, Hiroaki Osanai, Katsuhiko Ogasawara Neurosurgical Focus 52 (6) E2 -E2 2022年06月 

  OBJECTIVE “Join,” an imaging technology–based telemedicine system, allows simultaneous radiological information sharing between physically remote institutions, virtually connecting advanced medical institutions and rural hospitals. This study aimed to elucidate the health economics effect of Join for neurological telemedicine in rural areas in Hokkaido, Japan. METHODS Information concerning 189 requests for patient transfer from Furano Kyokai Hospital, a regional rural hospital, to Asahikawa Medical University Hospital (AMUH), an advanced academic medical institution, was retrospectively collected. The Join system was established between Furano Kyokai Hospital and AMUH in February 2019. Data collected from patients between April 2017 and December 2018 were included in the non-Join group, and those collected between February 2019 and October 2020 were included in the Join group. Clinical variables, reasons for patient transfer requests, duration of hospital stay, and medical costs per patient were analyzed between these two groups. Furthermore, clinical characteristics were compared between patients who were transferred and not transferred based on Join. RESULTS More patients were discharged < 7 days after transfer to AMUH in the non-Join group compared with the Join group (p = 0.02). When focusing on the Join group, more patients who were not transferred were discharged < 1 week (p < 0.01). On the other hand, more patients required surgery (p = 0.01) when transferred. The ratio of patients whose medical cost was < USD5000 substantially decreased, from 33% for the non-Join group to 13% for the Join group. CONCLUSIONS An imaging technology–based telemedicine system, Join, contributed to reducing unnecessary neuro-emergency patient transfer in a remote rural area, and telemedicine with an integrated smartphone system allowed medical personnel to effectively triage at a distance neuro-emergency patients requiring advanced tertiary care.
• 演繹法と帰納法の視点から見た医療AI

  平田 健司, 杉森 博行, 唐 明輝, 中谷 純, 小笠原 克彦, 豊永 拓哉, 工藤 與亮 北海道放射線医学雑誌 2 1 -6 2022年03月 

  医療AIが目覚ましい発達を続けている。AIに関する明確な定義はないため、今回、医療従事者等に対してAIに関する意識調査を行った結果、AIであるかどうかの境界線は、機械学習の有無にありそうだということがわかった。機械学習は帰納法に基づく考え方であり、あらかじめ多数のデータを学習させておくことで、明示的にルールを与えずとも未知の事例を正しく判断させる手法である。画像分類においては明示的ルールを与えることが困難であるため、機械学習が威力を発揮する。第3次AIブームの現在、AIといえば機械学習に基づくAIのことを指すことが多い。これに対して、第1次、第2次AIブームでは推論、探索、エキスパートシステムといった演繹法に基づくAIが盛んに研究されたが成功せず、冬の時代を経験した。我々は、帰納法のみのAIではいずれ限界に到達する可能性があり、演繹法の手法をいかに組み合わせていくかが今後の課題になっていくと考えている。(著者抄録)
• 北海道における急性期脳梗塞治療の地理的アクセシビリティについて 2-step floating catchment area(2sFCA)法の有用性の検討

  坂東 恭平, 藤原 健祐, 谷川 琢海, 長内 俊也, 小笠原 克彦 医療情報学連合大会論文集 41回 559 -560 2021年11月
• NDBオープンデータを用いたリハビリ従事者需給に関する生態学的研究

  森井 康博, 石川 智基, 藤原 健祐, 此村 恵子, 小笠原 克彦 医療情報学連合大会論文集 41回 1061 -1062 2021年11月
• 北海道における病院経営人材育成プログラムの必要性について 北海道大学病院経営アドミニストレーター育成拠点における取り組み

  青木 智大, 森井 康博, 椎名 希美, 石川 智基, 鈴木 哲平, 藤原 健祐, 谷 祐児, 小笠原 克彦 医療情報学連合大会論文集 41回 1104 -1105 2021年11月
• 自治体による健康ポイント事業の効果検証および事業評価方法の検討 傾向スコアマッチングによる介護レセプト分析

  鈴木 哲平, 藤原 健祐, 永井 亘, 青山 毅, 榎本 尚志, 中田 駿太朗, 小笠原 克彦 医療情報学連合大会論文集 41回 1153 -1154 2021年11月
• 北海道における急性期脳梗塞治療の地理的アクセシビリティについて 2-step floating catchment area(2sFCA)法の有用性の検討

  坂東 恭平, 藤原 健祐, 谷川 琢海, 長内 俊也, 小笠原 克彦 医療情報学連合大会論文集 41回 559 -560 2021年11月
• 足底に対するキネシオロジーテーピングが高齢者の立位バランス機能に与える影響

  寒川 美奈, 井野 拓実, 越野 裕太, 木田 貴英, 遠山 晴一, 鈴木 哲平, 小笠原 克彦 日本未病学会雑誌 27 (2) 29 -33 2021年08月 

  本研究は,足底へのキネシオロジーテーピングが高齢者の動的バランス機能へ及ぼす影響について調べた.対象は,本研究参加に同意の得られた65歳以上の高齢女性44名(年齢74.3±7.1歳)とした.キネシオロジーテープは,足底中央長軸方向に貼付した.バランス機能の評価は,床反力計(FDM-S ver. 1.2.0,Zebris社製)を用いて調べ,測定は開眼静止立位および前傾立位保持における足圧中心の移動をキネシオロジーテープ貼付実施前後に調べた.結果として,静止立位ではキネシオロジーテーピング前後のCOP総軌跡長や動揺面積,移動量全てにおいて有意な変化は認められなかった.一方,前傾立位保持課題においては,キネシオロジーテーピングによりCOP総軌跡長,移動量の前後成分において有意な減少がみられた.以上の結果より,高齢者に対する足底へのキネシオロジーテーピングは,前傾立位でのバランス機能を向上させる効果が示唆された.(著者抄録)
• スタティックストレッチングが高齢者の姿勢制御に与える即時効果

  岡 出海, 寒川 美奈, 大場 健裕, 萬井 太規, 鈴木 哲平, 小笠原 克彦 スポーツ理学療法学 1 (Supplement) OS-03-05 -OS-03-05 2021年
• 自治体の特徴に合わせた特定健診受診率向上支援のための自治体グルーピングの試み

  森井 康博, 市村 剛一, 本間 達也, 浅倉 宏至, 柴山 渉, 椎名 希美, 中谷 純, 小笠原 克彦 医療情報学連合大会論文集 40回 726 -727 2020年11月
• 北海道の市町村を対象とした特定健診受診率に寄与する要因に関する生態学的研究

  森井 康博, 市村 剛一, 本間 達也, 柴山 渉, 浅倉 宏至, 椎名 希美, 中谷 純, 小笠原 克彦 日本医療・病院管理学会誌 57 (Suppl.) 188 -188 2020年10月
• モーションキャプチャーシステムを用いたマンモグラフィ術者の動作解析

  川合 美帆, 谷川原 綾子, 山品 博子, 鈴木 哲平, 小笠原 克彦 北海道放射線技術雑誌 (88) 70 -71 2020年04月
• 小児髄芽腫陽子線治療における放射線誘発性二次がんに伴う費用分析のための決定木モデルの構築

  田森帆乃夏, 吉村高明, 森井康博, 小笠原克彦 医療情報学連合大会プログラム・抄録集 40th 2020年
• 自治体の特徴に合わせた特定健診受診率向上支援のための自治体グルーピングの試み

  森井康博, 市村剛一, 本間達也, 浅倉宏至, 柴山渉, 椎名希美, 中谷純, 小笠原克彦 医療情報学連合大会論文集(CD-ROM) 40th 2020年
• 特定健康診査における受診者のHbA1cの変化に関連する因子の検討

  浜館茉緒, 森井康博, 中谷純, 小笠原克彦 医療情報学連合大会論文集(CD-ROM) 40th 2020年
• 特定健康診査における受診者のHbA1cの変化に関連する因子の検討

  浜館茉緒, 森井康博, 中谷純, 小笠原克彦 医療情報学連合大会プログラム・抄録集 40th 2020年
• 集中指数(CI:Concentration Index)による中国における医療資源分布の評価

  楊雨辰, 森井康博, 藤原健祐, 藤原健祐, 小笠原克彦 医療情報学連合大会プログラム・抄録集 40th 2020年
• 全国における急性期脳梗塞に対する血栓回収療法研修施設の地理的分布の評価

  谷松子, 藤原健祐, 藤原健祐, 谷川琢海, 長内俊也, 小笠原克彦 医療情報学連合大会プログラム・抄録集 40th 2020年
• 小児髄芽腫陽子線治療における放射線誘発性二次がんに伴う費用分析のための決定木モデルの構築

  田森帆乃夏, 吉村高明, 森井康博, 小笠原克彦 医療情報学連合大会論文集(CD-ROM) 40th 2020年
• 携帯端末を通して得られたCT画像を用いた画像分類の精度評価の検討

  曹 瀛丹, 杉森 博行, 小笠原 克彦 医療情報学連合大会論文集 39回 788 -789 2019年11月
• GISによる救急搬送シミュレーションの妥当性の検証

  谷 松子, 藤原 健祐, 上村 修二, 葛西 毅彦, 奈良 理, 森井 康博, 小笠原 克彦 医療情報学連合大会論文集 39回 448 -448 2019年11月
• 中国における医療資源の省間分布から見る医療格差

  楊 雨辰, 森井 康博, 藤原 健祐, 石川 智基, 山品 博子, 鈴木 哲平, 中谷 純, 小笠原 克彦 医療情報学連合大会論文集 39回 358 -359 2019年11月
• モーションキャプチャーとタスクオントロジーを用いたマンモグラフィ撮影における暗黙知のモデル化

  谷川原 綾子, 井上 剛, 北川 剛, 山品 博子, 鈴木 哲平, 藤原 健祐, 小笠原 克彦 医療情報学連合大会論文集 39回 404 -405 2019年11月
• 包絡分析法を用いた将来推計患者数に基づく医療資源の効率性評価

  谷川 琢海, 藤原 健祐, 西本 尚樹, 大場 久照, 小笠原 克彦 医療情報学連合大会論文集 39回 199 -200 2019年11月
• GISを用いた脳卒中診療拠点病院の適正配置モデルの検討

  森井 康博, 谷 松子, 谷川 琢海, 小笠原 克彦 医療情報学連合大会論文集 39回 923 -924 2019年11月
• アイトラッカーを用いた検診機関Webサイトの視線分析の試み 検診機関が届けたい情報と受診者の閲覧する情報の相違点

  鈴木 隆介, 藤田 奈穂, 鈴木 哲平, 黒蕨 邦夫, 小笠原 克彦 医療情報学連合大会論文集 39回 270 -271 2019年11月
• 包絡分析法を用いた将来推計患者数に基づく医療資源の効率性評価

  谷川 琢海, 藤原 健祐, 西本 尚樹, 大場 久照, 小笠原 克彦 医療情報学連合大会論文集 39回 256 -256 2019年11月
• 中国における医療資源の省間分布から見る医療格差

  楊 雨辰, 森井 康博, 藤原 健祐, 石川 智基, 山品 博子, 鈴木 哲平, 中谷 純, 小笠原 克彦 医療情報学連合大会論文集 39回 297 -297 2019年11月
• モーションキャプチャーとタスクオントロジーを用いたマンモグラフィ撮影における暗黙知のモデル化

  谷川原 綾子, 井上 剛, 北川 剛, 山品 博子, 鈴木 哲平, 藤原 健祐, 小笠原 克彦 医療情報学連合大会論文集 39回 307 -307 2019年11月
• GISを用いた脳卒中診療拠点病院の適正配置モデルの検討

  藤原 健祐, 長内 俊也, 森井 康博, 谷 松子, 谷川 琢海, 小笠原 克彦 医療情報学連合大会論文集 39回 447 -447 2019年11月
• 北海道での理想的な血栓回収療法提供体制の確立に向けた取り組み

  長内 俊也, 東海林 菊太郎, 今井 哲秋, 寳金 清博, 小笠原 克彦 脳血管内治療 4 (Suppl.) S160 -S160 2019年11月 [査読有り][通常論文]
  
• 北海道大学病院経営アドミニストレーター育成拠点における取り組み

  小笠原克彦, 藤原健祐, 森井康博, 石川智基, 鈴木哲平, 谷祐児 日本医療・病院管理学会誌 56 (Suppl.) 153 -153 2019年10月 [査読無し][通常論文]
  
• 地域居住高齢者の視知覚機能、認知機能と作業遂行状態の関連

  井上 貴雄, 高島 理沙, 鈴木 哲平, 水口 寛彦, 小笠原 克彦 日本作業療法学会抄録集 53回 PN -2C08 2019年09月
• 包絡分析法を用いた都道府県ごとの放射線医療資源分布の効率性分析

  谷川 琢海, 藤原 健祐, 石川 智基, 小笠原 克彦 日本放射線技術学会雑誌 75 (9) 999 -999 2019年09月
• 中国における医療資源の省間分布から見る医療格差

  YANG Yuchen, 森井康博, 藤原健祐, 石川智基, 石川智基, 山品博子, 鈴木哲平, 鈴木哲平, 中谷純, 小笠原克彦 医療情報学連合大会論文集(CD-ROM) 39th 2019年
• 北海道での理想的な血栓回収療法提供体制の確立に向けた取り組み

  長内俊也, 東海林菊太郎, 今井哲秋, 寳金清博, 小笠原克彦 脳血管内治療(Web) 4 (Supplement) 2019年
• 北海道の将来における医療資源の適正配置―将来推計人口と推計傷病別患者数によるシミュレーション分析―

  谷川琢海, 藤原健祐, 西本尚樹, 大場久照, 小笠原克彦 医療情報学連合大会プログラム・抄録集 38th 438 2018年11月22日 [査読無し][通常論文]
  
• 道央地域におけるドクターヘリ搬送時間の季節間比較

  小林永一, 上村修二, 奈良理, 藤原健祐, 石川智基, 小笠原克彦 医療情報学連合大会プログラム・抄録集 38th 441 2018年11月22日 [査読無し][通常論文]
  
• 道央地域におけるドクターヘリ搬送時間の季節間比較

  小林 永一, 上村 修二, 奈良 理, 藤原 健祐, 石川 智基, 小笠原 克彦 医療情報学連合大会論文集 38回 1106 -1107 2018年11月
• ISM(Interpretive Structural Modeling)法による遠隔医療普及阻害要因の抽出と普及に向けた対応策について

  清水 大暉, 辻 慎太朗, 谷川 琢海, 谷 祐児, 小笠原 克彦 医療情報学連合大会論文集 38回 606 -607 2018年11月
• 北海道の将来における医療資源の適正配置 将来推計人口と推計傷病別患者数のシミュレーション分析

  谷川 琢海, 藤原 健祐, 西本 尚樹, 大場 久照, 小笠原 克彦 医療情報学連合大会論文集 38回 1094 -1096 2018年11月
• 北海道における血栓回収療法の現状 Geometric information system(GIS)を用いた検討

  長内 俊也, 東海林 菊太郎, 宝金 清博, 藤原 健祐, 小笠原 克彦 脳血管内治療 3 (Suppl.) S224 -S224 2018年11月
• テキストマイニングによる日本放射線技術学会雑誌における研究動向調査

  谷川原 綾子, 辻 真太朗, 小笠原 克彦 日本放射線技術学会雑誌 74 (9) 978 -978 2018年09月
• 両親の教育歴と児のSmall for gestational ageとの媒介要因分析 北海道スタディ

  田村 菜穂美, 花岡 知之, 伊藤 久美子, 伊藤 佐智子, 宮下 ちひろ, 荒木 敦子, 小笠原 克彦, 岸 玲子 日本衛生学雑誌 73 (Suppl.) S244 -S244 2018年03月 [査読無し][通常論文]
  
• 両親の教育歴と児のSmall for gestational ageとの媒介要因分析 北海道スタディ

  田村 菜穂美, 花岡 知之, 伊藤 久美子, 伊藤 佐智子, 宮下 ちひろ, 荒木 敦子, 小笠原 克彦, 岸 玲子 日本衛生学雑誌 73 (Suppl.) S244 -S244 2018年03月
• 教育課程のあり方モデル 4+2年制課程のメリット・デメリット

  小笠原克彦, 小笠原克彦 日本診療放射線技師会誌 65 (3) 240‐244 2018年03月01日 [査読無し][通常論文]
  
• 両親の教育歴と児のSmall for gestational ageとの媒介要因分析:北海道スタディ

  田村菜穂美, 田村菜穂美, 花岡知之, 伊藤久美子, 伊藤久美子, 伊藤佐智子, 宮下ちひろ, 荒木敦子, 小笠原克彦, 小笠原克彦, 岸玲子 日本衛生学雑誌(Web) 73 (Supplement) S244 2018年03月 [査読無し][通常論文]
  
• 北海道中小規模民間病院における病院情報システム利活用の検討

  谷祐児, 藤原健祐, 小笠原克彦 日本放射線技術学会雑誌 74 (9) 975‐976(J‐STAGE) -976 2018年 [査読無し][通常論文]
  
• 糖尿病患者の生活習慣改善に影響を与える要因及び地域性の可視化―ベイジアンネットワークを用いたレセプトデータ分析―

  鈴木哲平, 田村菜穂美, 榎本尚司, 永井亘, 小笠原克彦 日本医療情報学会春季学術大会プログラム・抄録集 22nd 68‐69 2018年 [査読無し][通常論文]
  
• NDBレセプト情報の転帰区分に記載されている死者数の精度

  高塚伸太朗, 山口徳蔵, 佐瀬雄治, 小笠原克彦, 辰巳治之, 大西浩文 日本医療情報学会春季学術大会プログラム・抄録集 22nd 150‐151 2018年 [査読無し][通常論文]
  
• 地理情報システムを利用した北海道における脳卒中センターの適正配置分析

  藤原健祐, 長内俊也, 谷川琢海, 小笠原克彦 日本医療情報学会春季学術大会プログラム・抄録集 22nd 156‐157 2018年 [査読無し][通常論文]
  
• ベイジアンネットワークを用いた放射線関連Webサイトの閲覧モデルの構築

  鈴木隆介, 鈴木哲平, 辻真太朗, 小笠原克彦 日本医療情報学会春季学術大会プログラム・抄録集 22nd 80‐81 2018年 [査読無し][通常論文]
  
• 将来推計人口メッシュに基づく医療資源の適正配置分析―北海道における患者アクセシビリティの最適化―

  谷川琢海, 大場久照, 西本尚樹, 小笠原克彦 日本医療情報学会春季学術大会プログラム・抄録集 22nd 160‐161 2018年 [査読無し][通常論文]
  
• 北海道の将来における患者受療行動予測分析 未来に向けた医療資源の適正配置に向けて

  谷川 琢海, 大場 久照, 西本 尚樹, 小笠原 克彦 医療情報学連合大会論文集 37回 317 -319 2017年11月
• 2型糖尿病患者に対するCGM(Continuous glucose monitoring)システムを用いた血糖値モニタリングアプリケーションの経済評価 マルコフモデルを用いた医療費の推定

  辻 真太朗, 鈴木 哲平, 石川 智基, 森井 康博, 谷川 琢海, 小笠原 克彦 医療情報学連合大会論文集 37回 1067 -1068 2017年11月
• 医療機器不具合用語集における定義文記載法の標準化に向けた表記パターン分析

  谷川原 綾子, 西本 尚樹, 福田 晋久, 辻 真太郎, 谷川 琢海, 小笠原 克彦, 横井 英人 医療情報学連合大会論文集 37回 1192 -1193 2017年11月
• 北海道の急性期脳梗塞診療に対する地理的アクセシビリティ分析

  藤原健祐, 長内俊也, 小林永一, 谷川琢海, 小笠原克彦 医療情報学連合大会論文集 37th (CD-ROM) ROMBUNNO.3‐L‐4‐PP12‐1 -1113 2017年11月01日 [査読無し][通常論文]
  
• 人口構造の変化を考慮したDemand‐based approachによる医療需給の将来予測―北海道の救急医療を対象として―

  石川智基, 藤原健祐, 鈴木哲平, 辻真太朗, 小笠原克彦 医療情報学連合大会論文集 37th (CD-ROM) ROMBUNNO.3‐B‐3‐OP21‐3 -738 2017年11月01日 [査読無し][通常論文]
  
• System Dynamicsによる医師数充足と地域偏在の将来予測―北海道の周産期医療を対象として―

  石川智基, 藤原健祐, 森井康博, 鈴木哲平, 辻真太朗, 小笠原克彦 医療情報学連合大会論文集 37th (CD-ROM) ROMBUNNO.3‐L‐4‐PP12‐2 -1115 2017年11月01日 [査読無し][通常論文]
  
• 北海道における救急車の現場到達時間から見た到達圏人口の推計

  小林永一, 藤原健祐, 石川智基, 小笠原克彦 医療情報学連合大会論文集 37th (CD-ROM) ROMBUNNO.2‐C‐1‐OP2‐1 -316 2017年11月01日 [査読無し][通常論文]
  
• 地域偏在度と集中度の分析を併せた北海道における医療従事者の配置検討

  森井康博, 藤原健祐, 石川智基, 鈴木哲平, 辻真太朗, 小笠原克彦 医療情報学連合大会論文集 37th (CD-ROM) ROMBUNNO.3‐L‐4‐PP12‐3 -1117 2017年11月01日 [査読無し][通常論文]
  
• 病院情報システムの中小規模民間病院経営に対する寄与への考察

  谷祐児, 藤原健祐, 鈴木哲平, 小笠原克彦, 廣川博之 医療情報学連合大会論文集 37th (CD-ROM) ROMBUNNO.3‐B‐3‐OP21‐2 -736 2017年11月01日 [査読無し][通常論文]
  
• 脳神経外科領域の医療資源に対する患者アクセス

  水口比呂, 小林永一, 藤原健祐, 石川智基, 小笠原克彦 北海道放射線技術雑誌 83 (83) 81 -81 2017年10月31日 [査読無し][通常論文]
  
• ISM(Interpretive Structural Modeling)法による遠隔医療の普及を阻害する要因の構造化

  清水 大暉, 谷 祐児, 谷川 琢海, 辻 真太朗, 小笠原 克彦 北海道放射線技術雑誌 (83) 82 -82 2017年10月
• 教育講座 放射線技術学における研究倫理(8)人を対象とする医学系研究に関する倫理指針(改訂版)

  小笠原 克彦 日本放射線技術学会雑誌 = Japanese journal of radiological technology 73 (5) 397 -402 2017年05月
• Integration of Japanese Medical Device Adverse Event Terminologies.

  Ayako Yagahara, Takumi Tanikawa, Katsuhiko Ogasawara, Hideto Yokoi Studies in health technology and informatics 245 1345 -1345 2017年 

  The purpose of this study is to integrate Japanese medical device adverse event terminologies for evaluating terminological consistency. We represented hierarchy and relations among terms using Resource Description Framework (RDF). There were 3521 classes and 14650 properties. As a result of evaluating the consistency of the description in SPARQL, it was evident that the same notations existed within different terminologies (category terms and terms) and some terms had plural definitions.
• Patient accessibility to hospitals in winter road conditions: GIS-based analysis using car navigation probe data

  Takumi Tanikawa, Hisateru Ohba, Ayako Yagahara, Katsuhiko Ogasawara Studies in Health Technology and Informatics 245 1383 2017年 [査読有り][通常論文]
   

  The purpose of this study was to estimate geographical patient flow to hospitals during winter seasons using simulation analysis. We used probe data collected from car navigation systems and performed a Geographical Information System (GIS)-based analysis to determine the relationship between travel time to hospitals and winter road conditions. Accessibility to hospitals based on travel time in summer and winter was overlayed on a map to demonstrate the increase in travel time during winter.
• Markov Chain Monte Carlo 法による医療機関Webサイト訪問者の閲覧行動分析

  鈴木哲平, 谷祐児, 小笠原克彦 北海道医学雑誌 92 (1) 32 -32 2017年 [査読無し][通常論文]
  
• 医療情報学における地理情報システム(GIS)の利活用

  土井 俊祐, 小笠原 克彦, 矢口 浩平, 谷川 琢海, 中村 敦, 小林 大介 医療情報学連合大会論文集 36回 (1) 240 -241 2016年11月
• コンジョイント分析による診療放射線技術系学生の就労環境の選好に関する調査

  藤原 健祐, 谷川原 綾子, 北川 剛, 井上 剛, 小笠原 克彦 医療情報学連合大会論文集 36回 (1) 396 -398 2016年11月
• Convolutional Neural Networkにおけるマンモグラフィ装置品質管理用ファントムを用いた画像認識

  福田 晋久, 辻 真太朗, 鈴木 哲平, 谷川原 綾子, 上杉 正人, 小笠原 克彦 医療情報学連合大会論文集 36回 (2) 1036 -1037 2016年11月
• 医療機器不具合用語集における同義語抽出に向けた異義語除外法の検討

  谷川原 綾子, 西本 尚樹, 辻 真太朗, 福田 晋久, 谷川 琢海, 上杉 正人, 小笠原 克彦, 横井 英人 医療情報学連合大会論文集 36回 (2) 1038 -1039 2016年11月
• コンジョイント分析による診療放射線技術系学生の就労環境の選好に関する調査

  藤原健祐, 谷川原綾子, 北川剛, 井上剛, 小笠原克彦 医療情報学 36 (Supplement 1) 396‐398 2016年11月01日 [査読無し][通常論文]
  
• χ2値を用いた放射線技術学分野に関する特徴語抽出の試み

  福田 晋久, 谷川原 綾子, 辻 真太朗, 西本 尚樹, 谷川 琢海, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 72回 231 -231 2016年02月
• 放射線技術学用語集と教科書の索引語の重複調査

  辻 真太朗, 福田 晋久, 谷川原 綾子, 川眞田 実, 西本 尚樹, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 72回 231 -231 2016年02月
• 放射線技術学用語集構築に向けた領域間の重複語抽出と定義付与について

  谷川原 綾子, 辻 真太朗, 福田 晋久, 谷川 琢海, 川眞田 実, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 72回 231 -232 2016年02月
• 食物アレルギー情報交換の標準化に向けたコード体系と交換様式の提案

  星本 弘之, 小笠原 克彦, 古川 裕之, 池田 和之, 小塚 和人, 近藤 博史, 下堂薗 権洋, 谷川 琢海, 大原 信 医療情報学連合大会論文集 35回 840 -843 2015年11月
• 医療機器不具合用語集の現状調査と問題点抽出

  谷川原 綾子, 辻 真太朗, 福田 晋久, 西本 尚樹, 谷川 琢海, 上杉 正人, 小笠原 克彦, 横井 英人 医療情報学連合大会論文集 35回 846 -848 2015年11月
• N-gramを用いた放射線技術領域へのオントロジー技術利用に関する文献の調査

  福田 晋久, 安渡 大輔, 辻 真太朗, 谷川原 綾子, 小笠原 克彦 医療情報学連合大会論文集 35回 916 -917 2015年11月
• 地理情報システムを利用した高性能画像診断装置へのアクセシビリティ分析

  藤原健祐, 高橋拓也, 小笠原克彦 医療情報学連合大会論文集 35th 1252‐1253 -1253 2015年11月01日 [査読無し][通常論文]
  
• コンジョイント分析による診療放射線技師を対象とした就労環境の選好に関する調査

  藤原健祐, 谷川原綾子, 北川剛, 井上剛, 福田晋久, 西本尚樹, 小笠原克彦 北海道放射線技術雑誌 79 96 2015年10月30日 [査読無し][通常論文]
  
• 放射線関連Tweetの現状と印象度調査の試み

  青木 智大, 谷 祐児, 谷川原 綾子, 西本 尚樹, 小笠原 克彦 北海道放射線技術雑誌 (79) 96 -96 2015年10月
• コンジョイント分析による診療放射線技師を対象とした就労環境の選好に関する調査

  北川剛, 井上剛, 藤原健祐, 谷川原綾子, 福田普久, 西本尚樹, 小笠原克彦 日本放射線技術学会雑誌 71 (9) 832 -833 2015年09月20日 [査読無し][通常論文]
  
• CT・MRI保有施設へのアクセシビリティ分析―北海道における現状と将来予測―

  藤原健祐, 藤原健祐, 高橋拓也, 小笠原克彦 日本放射線技術学会雑誌 71 (9) 951 -951 2015年09月20日 [査読無し][通常論文]
  
• 児の出生体重と母親の社会経済要因との関連についての疫学研究 北海道スタディ

  田村 菜穂美, 伊藤 久美子, 花岡 知之, 喜多 歳子, 西原 進吉, 宮下 ちひろ, 荒木 敦子, 小笠原 克彦, 岸 玲子 日本衛生学雑誌 70 (Suppl.) S190 -S190 2015年03月 [査読無し][通常論文]
  
• ベイズ補正標準化死亡比を用いた死亡と医療資源の関連性の分析―北海道を対象として

  忠竜宏, 藤原健祐, 小笠原克彦 医療情報学連合大会論文集 34th 580 -581 2014年11月06日 [査読無し][通常論文]
  
• ジニ係数とハーフィンダール‐ハーシュマン指数を援用した高性能画像診断装置の偏在評価

  藤原健祐, 忠竜宏, 小笠原克彦 医療情報学連合大会論文集 34th 582 -583 2014年11月06日 [査読無し][通常論文]
  
• 画像診断検査による大腸癌肝転移の術前検索における効率の評価

  岩田 邦弘, 村上 昇, 鈴木 達也, 森谷 俊春, 谷川 琢海, 小笠原 克彦 医療情報学連合大会論文集 34回 340 -341 2014年11月
• 札幌市における診療科ごとの患者集積分析

  高橋 拓也, 谷川 琢海, 小笠原 克彦 医療情報学連合大会論文集 34回 572 -573 2014年11月
• 臨床試験登録データベースを用いた試験件数増加の変化点検出

  西本 尚樹, 伊藤 陽一, 谷川原 綾子, 辻 真太朗, 福田 晋久, 上杉 正人, 小笠原 克彦 医療情報学連合大会論文集 34回 306 -307 2014年11月
• ネットワーク分析による病名とMRI撮影プロトコル間の関係性分析

  谷川原 綾子, 辻 真太朗, 潟端 純也, 小笠原 克彦, 仲 知保 医療情報学連合大会論文集 34回 902 -903 2014年11月
• 形容詞を対象とした共起する用語の可視化 放射線治療のリスクと安全に関する文献のテキストマイニング

  安渡 大輔, 辻 真太朗, 福田 晋久, 谷川原 綾子, 本間 勝美, 小笠原 克彦 北海道放射線技術雑誌 (77) 22 -23 2014年09月
• 放射線治療におけるエラーの分類に対する標準化を目指したオントロジーの適用

  辻 真太朗, 福田 晋久, 谷川原 綾子, 西本 尚樹, 本間 勝美, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 70回 186 -186 2014年02月
• ネットワーク分析を用いたMRI申込書記載内容と撮影プロトコルの関係の可視化

  谷川原 綾子, 辻 真太朗, 安渡 大輔, 潟端 純也, 濱口 裕行, 小笠原 克彦, 仲 知保 日本放射線技術学会総会学術大会予稿集 70回 186 -186 2014年02月
• 共起行列を用いた放射線防護に関する文献情報の体系化の試み

  福田 晋久, 辻 真太朗, 谷川原 綾子, 西本 尚樹, 本間 勝美, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 70回 186 -186 2014年02月
• Gini IndexとHerfindahl‐Hirschman Indexを併用した放射線診療資源の偏在評価―北海道の経時的変化

  藤原健祐, 忠竜宏, 小笠原克彦 医療情報学連合大会論文集 33rd 298 -299 2013年11月20日 [査読無し][通常論文]
  
• インシデントデータに基づいた放射線治療業務のリスクに影響を与える要因分析

  佐々木 翔平, 南須原 康行, 遠藤 晃, 佐久嶋 研, 辻 真太朗, 谷川原 綾子, 小笠原 克彦 医療情報学連合大会論文集 33回 478 -479 2013年11月
• 臨床試験登録データベースを用いた試験情報の探索的解析

  西本 尚樹, 伊藤 陽一, 谷川原 綾子, 辻 真太朗, 福田 晋久, 小笠原 克彦 医療情報学連合大会論文集 33回 402 -403 2013年11月
• 大学と調剤薬局を結んだ遠隔健康相談 400例の相談内容と今後の展開

  小笠原 克彦, 下田 智子, 吉田 祐子, 良村 貞子, 岡崎 光洋, 後藤 輝明, 吉町 昌子, 岩丸 宏明, 田村 信吾, 森山 広行, 黄瀬 信之 医療情報学連合大会論文集 33回 1216 -1217 2013年11月
• 肝細胞特異性MRI造影剤Gd-EOB-DTPA検査の転移性肝腫瘍検出能の評価 システマティックレビューの手法による検討

  岩田 邦弘, 村上 昇, 鈴木 達也, 森谷 俊春, 谷川 琢海, 小笠原 克彦 北海道放射線技術雑誌 (75) 108 -108 2013年10月
• テキストマイニングを用いた高度遠隔健康相談内容の探索的検討

  下田 智子, 良村 貞子, 岡崎 光洋, 後藤 輝明, 吉町 昌子, 岩丸 宏明, 田村 信吾, 小笠原 克彦 日本医療情報学会看護学術大会論文集 14回 51 -52 2013年07月 

  高速インターネットによる健康相談システムを開発し、遠隔健康相談ができるようになった。この遠隔健康相談記録の内容をテキストマイニング技法により、探索的検討を行った。分析対象期間は2010年3月から2012年6月であった。利用件数は354件(男性122名、女性230名、不明2名)であった。店舗ごとの相談件数は北海道内の4店舗はほぼ同数であり、僻地型、都市近郊型、都市型で差はなかった。利用者の年齢は10から90歳代であり、70歳代が最も多かった。相談内容は、健康相談、育児、排泄、栄養、生活習慣病、運動等であった。全相談のうち16%は、医療機関への受診が必要と判断し、利用者へ受診推奨をした。相談内容を分析すると、名詞では「薬」「受診」「血圧」の出現頻度が高く、形容詞では「高い」「悪い」「痛い」が頻度の上位を占めていた。各言語間の相関関係は明らかにならなかった。「受診」の頻度が高いのは受診すべきか否かを判断して欲しい利用者のニーズの現れであると考えられた。
• 地域住民からの健康相談対応に期待される看護師と薬剤師の連携に関する調査研究

  平塚 美奈, 岡崎 光洋, 小笠原 克彦, 下田 智子, 良村 貞子, 中安 一幸, 後藤 輝明, 吉町 昌子 日本薬学会年会要旨集 133年会 (4) 196 -196 2013年03月
• 医学・医療分野におけるオントロジーに関する文献の調査

  福田 晋久, 辻 真太朗, 谷川原 綾子, 西本 尚樹, 本間 勝美, 上杉 正人, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 69回 151 -151 2013年02月
• 放射線技術領域における非劣性検定の症例数設計

  西本 尚樹, 伊藤 陽一, 谷川原 綾子, 辻 真太朗, 福田 晋久, 谷川 琢海, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 69回 156 -156 2013年02月
• An ontology design for visualizing implicit knowledge of the radiotherapy risk

  Shintaro Tsuji, Akihisa Fukuda, Ayako Yagahara, Katsumi Homma, Naoki Nishimoto, Masahito Uesugi, Katsuhiko Ogasawara Studies in Health Technology and Informatics 192 (1-2) 994 2013年 [査読有り][通常論文]
   

  Knowledge sharing of radiotherapy risk contributes to keep the safety practice between the oncologists, medical physicists, and therapists. But the mechanisms of risks tend to complex because of its diversities. Recently, an ontological analysis is tried to share knowledge in the various domains. Therefore, the aim of this study is to construct Radiotherapy Risk Ontology (RRO) and clarify the implicit structures of risks towards knowledge sharing. The method of this study is below. First, the classes and relations were extracted from the risk categorization of the publications. Second, these classes and relationships were connecting and mapping by the ontology editor. Third, the total relationships of classes were verified using paired comparison chart. This paper distinguishes between publication-oriented relationships and the other relationships. And these relationships was defined the explicit and implicit relationships. RRO was constructed 789 classes and 14 types of the explicit relationships. The 22 types of the implicit relationships were clarified using paired comparison. RRO provided the conceptual mapping and the implicit knowledge. The result of this study assisted the knowledge sharing. © 2013 IMIA and IOS Press.
• WTP (Willingness To Pay) for Tele-Health Consultation Service in Hokkaido, Japan

  Katsuhiko Ogasawara, Tamotsu Abe MEDINFO 2013: PROCEEDINGS OF THE 14TH WORLD CONGRESS ON MEDICAL AND HEALTH INFORMATICS, PTS 1 AND 2 192 1026 -1026 2013年 [査読有り][通常論文]
   

  We developed a tele-health consultation system that combines a sphygmomanometer with a tele-conference system. These were placed in pharmacies and the University. We selected five pharmacies to set up a consultation room; one in a local area, two in a suburban area, and the remaining two in an urban area. Nurses with more than 5 years of clinical experience were assigned as consultants. These consultants offer health consultation but do not practice medicine. Some researchers have indicated the economic viability of at-home health management systems, but nothing has been researched on the economic viability of tele-health consultation. The objective of present study was estimated Willingness to Payment (WTP) of Tele-health consultation service. The WTP was estimated by Double-Bounded Dichotomous-Choice model. We performed logistic-regression analysis to confirm factors to affect WTP. The number of the respondent was 480. Mean WTP was calculated 495 yen and the median was 367 yen. There was significant difference for factor of "annual income", "have a willingness to use this system", and "have a child/children."
• Constructing Mammography Examination Process Ontology Using Affinity Diagram and Hierarchical Task Analysis

  Ayako Yagahara, Shintarou Tsuji, Akihisa Fukuda, Yuki Yokooka, Naoki Nishimoto, Kunio Kurowarabi, Katsuhiko Ogasawara MEDINFO 2013: PROCEEDINGS OF THE 14TH WORLD CONGRESS ON MEDICAL AND HEALTH INFORMATICS, PTS 1 AND 2 192 1059 -1059 2013年 [査読有り][通常論文]
   

  Mammography is complex and difficult for beginner radiologic technologists (RTs) because knowledge and technical skills rely on one's experience, and it is often difficult for experienced RTs to verbally explain the process to co-workers or beginners. The purpose of this study was to construct a mammography examination process ontology for knowledge sharing among RTs and propose a new ontology construction method using an affinity diagram (AD) and hierarchical task analysis (HTA). First, tasks collected by brainstorming were clustered and connected using the AD. Subsequently, a hierarchical structure was constructed based on the clusters and relations determined in the AD. Finally, a mammography process ontology was determined based on the relations noted in the AD and HTA. As a result, the ontology contained 203 classes and 669 relations.
• A Pilot Study Measuring Changes in Student Impressions before and after Clinical Training Using a Questionnaire Based on the Semantic Differential Technique

  Naomi Tamura, Takayoshi Terashita, Katsuhiko Ogasawara MEDINFO 2013: PROCEEDINGS OF THE 14TH WORLD CONGRESS ON MEDICAL AND HEALTH INFORMATICS, PTS 1 AND 2 192 1038 -1038 2013年 [査読有り][通常論文]
   

  Students with a positive impression of their studies can become more motivated. This study measured the learning impact of clinical training by comparing student impressions before and after clinical training. The study included 32 students of radiological technology in their final year with the Division of Radiological Science and Technology, Department of Health Sciences, School of Medicine, Hokkaido University. To measure student impressions of x-ray examination training, we developed a questionnaire using the semantic differential technique. The resulting factor analysis identified 2 factors that accounted for 44.9% of the 10 bipolar adjective scales. Factor 1 represented a "resistance" impression of x-ray examination training, and factor 2 represented a "responsibility" impression. The differences in factor scores before and after the clinical training suggest that student impressions are affected by clinical training.
• 放射線治療業務を対象としたリスク要因のベイジアンネットワーク分析 放射線治療業務における分析

  佐々木 翔平, 谷川原 綾子, 小笠原 克彦, 辻 真太朗 北海道放射線技術雑誌 (73) 114 -114 2012年11月
• 生物統計学語彙の構造化を目指した用語収集システムの構築と語彙の階層化

  西本 尚樹, 伊藤 陽一, 谷川原 綾子, 横岡 由姫, 辻 真太朗, 福田 晋久, 上杉 正人, 小笠原 克彦 医療情報学連合大会論文集 32回 274 -275 2012年11月
• ベイジアンネットワークによる放射線治療業務のリスクに影響を与える要因分析

  佐々木 翔平, 辻 真太朗, 谷川原 綾子, 小笠原 克彦 医療情報学連合大会論文集 32回 1104 -1105 2012年11月
• マンモグラフィ内外斜位方向撮影技術に関するオントロジー構築

  谷川原 綾子, 横岡 由姫, 辻 真太朗, 福田 晋久, 西本 尚樹, 黒蕨 邦夫, 小笠原 克彦 医療情報学連合大会論文集 32回 1454 -1455 2012年11月
• オントロジーに関する英文論文抄録を対象とした使用目的の分類

  福田 晋久, 辻 真太朗, 谷川原 綾子, 西本 尚樹, 上杉 正人, 小笠原 克彦 医療情報学連合大会論文集 32回 1456 -1457 2012年11月
• ロジック・ツリーを用いた情報共有のための電子カルテ機能の可視化

  横岡 由姫, 谷川原 綾子, 辻 真太朗, 向井 まさみ, 西本 尚樹, 上杉 正人, 奥田 保男, 小笠原 克彦 医療情報学連合大会論文集 32回 1462 -1463 2012年11月
• 教育講座 : 放射線技術学で必要な基礎統計学(3)記述統計とデータの可視化

  谷川 琢海, 西本 尚樹, 小笠原 克彦 日本放射線技術学会雑誌 68 (11) 1546 -1554 2012年11月 [査読無し][通常論文]
  
• 仮想評価法を利用した地方の自治体病院のための支払意思額

  寺下 貴美, 武藤 浩志, 中村 利仁, 小笠原 克彦, 前沢 政次 北海道醫學雜誌 = Acta medica Hokkaidonensia 87 (4) 2012年08月 [査読無し][通常論文]
  
• 活動基準原価計算(ABC)によるフィルムレス運用時のX線撮影の検査原価

  武藤 浩史, 谷 祐児, 鈴木 重政, 横岡 由姫, 阿部 保, 佐瀬 雄治, 寺下 貴美, 小笠原 克彦 北海道醫學雜誌 = Acta medica Hokkaidonensia 87 (4) 2012年08月01日 [査読無し][通常論文]
  
• 遠隔健康相談システムを用いた薬局における健康相談の臨床実証報告

  岡崎 光洋, 小笠原 克彦, 阿部 保, 下田 智子, 良村 貞子, 中安 一幸, 後藤 輝明, 吉町 昌子, 岩丸 宏明, 田村 信吾 日本薬学会年会要旨集 132年会 (4) 189 -189 2012年03月
• 形態素解析を用いたオントロジーに関する文献の調査

  福田 晋久, 辻 真太朗, 横岡 由姫, 谷川原 綾子, 西本 尚樹, 上杉 正人, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 68回 129 -129 2012年02月
• アソシエーション分析を用いた放射線治療計画の確認タスクに対する暗黙的ルールの抽出

  辻 真太朗, 福田 晋久, 谷川原 綾子, 西本 尚樹, 上杉 正人, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 68回 134 -134 2012年02月
• 放射線技術学研究における統計解析手法の集計と誤用対策の提案

  西本 尚樹, 伊藤 陽一, 江口 菜弥帆, 谷川原 綾子, 上杉 正人, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 68回 279 -279 2012年02月
• 全国からみた北海道の診療科別医師構成に基づく地域特性の分析

  大場 久照, 鳴海 彩香, 谷川 琢海, 石川 智基, 上杉 正人, 小笠原 克彦 医療情報学連合大会論文集 31回 474 -476 2011年11月
• 調剤薬局に設置した遠隔保健相談システム 運用1年6ヵ月間の相談状況分析

  小笠原 克彦, 阿部 保, 下田 智子, 良村 貞子, 中安 一幸, 岡崎 光洋, 後藤 輝明, 吉町 昌子, 岩丸 宏明, 田村 信吾 医療情報学連合大会論文集 31回 769 -770 2011年11月
• 遠隔健康相談サービスの支払意志額の推計

  阿部 保, 中安 一幸, 良村 貞子, 下田 智子, 岡崎 光洋, 田村 信吾, 岩丸 宏明, 後藤 輝明, 吉町 昌子, 小笠原 克彦 医療情報学連合大会論文集 31回 771 -772 2011年11月
• 高度遠隔健康相談システムを用いた薬局における健康相談の臨床実証実験報告(一般演題(口頭)4,地域・在宅医療(1),Enjoy Pharmacists' Lifestyles)

  岡崎 光洋, 吉町 昌子, 後藤 輝明, 田村 信吾, 岩丸 宏明, 下田 智子, 良村 貞子, 小笠原 克彦 日本医療薬学会年会講演要旨集 21 (0) 2011年09月09日 [査読無し][通常論文]
  
• BI-6-2 ドラッグストアと大学を結んだ遠隔健康相談システム実証実験(BI-6. 実例から考える遠隔医療に必要な情報通信技術,依頼シンポジウム,ソサイエティ企画)

  小笠原 克彦, 阿部 保, 岡崎 光洋, 後藤 輝明, 吉町 昌子, 岩丸 宏明, 田村 信吾, 下田 智子, 良村 貞子 電子情報通信学会ソサイエティ大会講演論文集 2011 (1) "SS -47"-"SS-48" 2011年08月30日 [査読無し][通常論文]
  
• 放射線技術分野における検査オントロジー利用の可能性の検討 文献から調査した応用例

  福田 晋久, 辻 真太朗, 横岡 由姫, 谷川原 綾子, 西本 尚樹, 上杉 正人, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 67回 157 -157 2011年02月
• 放射線技術分野において検査オントロジーは何に使えるのか? 現場からのニーズの調査

  辻 真太朗, 福田 晋久, 横岡 由姫, 谷川原 綾子, 西本 尚樹, 上杉 正人, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 67回 157 -157 2011年02月
• 放射線治療計画の確認モデルの構築とルールの定義の試み

  辻 真太朗, 福田 晋久, 横岡 由姫, 谷川原 綾子, 西本 尚樹, 上杉 正人, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 67回 157 -158 2011年02月
• 放射線医学・技術学用語集の比較 用語の和訳と意味の記述について

  谷川原 綾子, 横岡 由姫, 辻 真太朗, 西本 尚樹, 上杉 正人, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 67回 158 -159 2011年02月
• X線撮影検査オントロジーのためのAnalytic Hierarchy Processを用いた診断可否の判断の明示化

  横岡 由姫, 谷川原 綾子, 辻 真太朗, 上杉 正人, 西本 尚樹, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 67回 230 -230 2011年02月
• Future Medical Services in Hokkaido – Present distribution of medical services and estimated numbers of future doctors

  Proceedings of International symposium on Globalism and Regional Economies; healthcare 13 -20 2011年 [査読無し][通常論文]
  
• 放射線画像診断レポートからの疾患名及びサイズ表現の抽出

  西本尚樹, 寺江聡, 谷川原綾子, 横岡由姫, 辻真太朗, 上杉正人, 小笠原克彦 医療情報学連合大会論文集 30th 413-414 2010年11月19日 [査読無し][通常論文]
  
• 地理情報システムによる千葉県の医療機能に関する経年評価 エントロピーモデルを用いた患者の受療行動の解析

  谷川 琢海, 大場 久照, 小笠原 克彦, 安藤 裕 医療情報学連合大会論文集 30回 695 -696 2010年11月
• マンモグラフィMLO撮影におけるポジショニングのプロセス分析とマンモグラムに与える影響

  谷川原 綾子, 横岡 由姫, 辻 真太朗, 西本 尚樹, 上杉 正人, 黒蕨 邦夫, 小笠原 克彦 医療情報学連合大会論文集 30回 1330 -1331 2010年11月
• 調剤薬局に設置した遠隔保健相談システムの開発と実証実験

  小笠原 克彦, 佐瀬 雄治, 吉田 祐子, 岡崎 光洋, 後藤 輝明, 吉町 昌子, 岩丸 宏明, 田村 信吾, 下田 智子, 良村 貞子 医療情報学連合大会論文集 30回 1181 -1182 2010年11月
• 北海道東部町村における高度遠隔健康相談システムの開発と現況

  吉田 祐子, 良村 貞子, 下田 智子, 岡崎 光洋, 後藤 輝明, 吉町 昌子, 岩丸 宏明, 田村 信吾, 小笠原 克彦 日本医療情報学会看護学術大会論文集 11回 9 -12 2010年06月 [査読無し][通常論文]
   

  北海道における医療サービス提供の地域格差を減少させるためのシステムとして高度遠隔健康相談システムを開発し、北海道東部町村で実証実験を行い、その概要を報告した。札幌の大学研究室に設置した相談室と中標津の薬局をシスコシステムズが開発したインターネットによる遠隔TV電話システムにより接続し、薬局で健康相談を希望する利用者が端末ユニットを利用して札幌の相談室の看護師らに相談するシステムである。
• 診療放射線技師の意思決定に影響を与える概念の抽出 検査オントロジーによる概念関係の可視化

  辻 真太朗, 横岡 由姫, 谷川原 綾子, 上杉 正人, 西本 尚樹, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 66回 235 -235 2010年02月
• 整形領域撮影時における再撮影タスク分析とX線検査オントロジーの構築

  横岡 由姫, 谷川原 綾子, 辻 真太朗, 西本 尚樹, 上杉 正人, 寺下 貴美, 小笠原 克彦 日本放射線技術学会総会学術大会予稿集 66回 239 -240 2010年02月
• CT画像を用いた改良領域拡張法による脳内血腫量半自動計測の試み

  信学技報 MI2011-36 19 -23 2010年 [査読無し][通常論文]
  
• semi-automated Extraction of Brain Hematoma from CT images Using Improved Region-Growing Method

  MI2011-36 19 -23 2010年 [査読無し][通常論文]
  
• Willingness to pay for the use of tele-consultations in pediatric emergency care: a survey on the attitudes of guardians by using a contingent valuation method (CVM)

  47 25 -36 2010年 [査読無し][通常論文]
  
• Improved Dual SnakesによるCT・MRI画像からの側脳室の抽出精度評価

  谷川原綾子, 西本尚樹, 上杉正人, 藤原健祐, 北川剛, 井上剛, 寺下貴美, 小笠原克彦 医療情報学連合大会論文集 29th 524 -525 2009年11月21日 [査読無し][通常論文]
  
• タスクオントロジーによるX線撮影技術プロセスの可視化の試み トラブルの有無による撮影プロセスの変化分析

  横岡 由姫, 谷川原 綾子, 辻 真太朗, 上杉 正人, 西本 尚樹, 寺下 貴美, 小笠原 克彦, 清野 孝 医療情報学連合大会論文集 29回 1042 -1043 2009年11月
• マンモグラフィ撮影装置を対象とした品質管理オントロジーの構築

  谷川原 綾子, 横岡 由姫, 辻 真太朗, 西本 尚樹, 上杉 正人, 黒蕨 邦夫, 寺下 貴美, 小笠原 克彦 医療情報学連合大会論文集 29回 1046 -1047 2009年11月
• 事後確率推定に基づく医学コーパス構築支援

  西本尚樹, 寺江聡, 上杉正人, 谷川原綾子, 小笠原克彦 医療情報学連合大会論文集 28th 957-958 2008年11月22日 [査読無し][通常論文]
  
• Dual Snakesによるノイズ画像からの輪郭抽出と精度評価

  谷川原 綾子, 西本 尚樹, 上杉 正人, 小笠原 克彦 医療情報学連合大会論文集 28回 444 -445 2008年11月
• Parsing error correction of medical phrases for semantic annotation of clinical radiology reports.

  Nishimoto N, Terae S, Uesugi M, Tanikawa T, Endou A, Ogasawara K, Sakurai T AMIA ... Annual Symposium proceedings / AMIA Symposium. AMIA Symposium 1070 -1070 2008年11月 [査読有り][通常論文]
   

  The purpose of this study is to develop a module for correcting errors in the product of a natural language parser. When tested with 300 CT reports, a total of 604 patterns were generated. The recall and precision was improved to 90.7% and 74.1% after processed by the module from initial 80.5% and 42.8% respectively. This rule-based module will help health care personnel reduce the cost of manual tagging correction for corpus building.
• 同一患者の複数施設受診による受療行動パターン抽出の試み : 診療報酬明細書データによるマーケットバスケット分析を用いた受療行動分析

  寺下 貴美, 村上 学, 中村 利仁, 川畑 秀伸, 小笠原 克彦, 前沢 政次 日本医療・病院管理学会誌 = Journal of the Japan Society for Healthcare administration 45 135 -135 2008年10月01日
• 重力モデルによる患者受療動向の分析 : 北海道二次医療圏を対象とした5年間推移

  石塚 和也, 寺下 貴美, 大場 久照, 谷川 琢海, 小笠原 克彦 日本医療・病院管理学会誌 = Journal of the Japan Society for Healthcare administration 45 (4) 289 -298 2008年10月01日 [査読無し][通常論文]
   

  近年，市町村合併や高齢化などにより患者の受療動向も変化している可能性がある。我々はこれまで患者の受療動向を二次医療圏の病院数および二次医療圏間の距離を用いた重力モデルにより説明できることを報告した。今回，北海道の患者受療動向の変化の状況を明らかにするため，平成12年・平成17年の診療分国保患者受療動向調査結果を対象に分析を行った。医療資源の規模・集積によって吸引される影響度を示す規模依存係数β，患者の移動に対する抵抗の大きさを示す距離係数γを入院・外来別に算出し，二次医療圏ごとに散布図として表示した。更に対象期間における係数の変化量と方向をベクトルで表した。散布図より医療資源が不十分であり，移動に負担を感じる二次医療圏は主に道東地域（釧路，根室，十勝，北網，遠紋）であった。ベクトル図より，変化量の顕著な二次医療圏を抽出でき，特に上川北部は入院・外来両方で規模依存係数と距離係数が悪化傾向にあった。The current trend observed in selecting a hospital by prospective patients may have been influenced by factors such as merging of municipalities and increasing number of senior citizens. Past st...
• 移動選好指数を用いた受療動向の評価に関する基礎的研究

  大場 久照, 谷川 琢海, 小笠原 克彦 日本医療・病院管理学会誌 = Journal of the Japan Society for Healthcare administration 45 (4) 299 -310 2008年10月01日 [査読無し][通常論文]
   

  目的：本研究では，移動選好指数 (MPI) を用いて入院・外来別の受療動向を分析し，特定地域に対する移動選好度を評価することである。方法：対象地域は北海道の二次医療圏（札幌，上川中部，留萌）とした。分析には平成17年5月診療分国保レセプトデータを用いた。MPI値100を基準として特定地域に対する移動選好度の測定と患者移動圏を画定した。また，流出率による測定との比較評価を行った。結果：札幌の流出圏は外来の1圏域であった。一方，流入圏は入院・外来とも広範囲にわたる10以上の圏域で，近隣圏域だけでなく3次医療圏外（宗谷と留萌）のMPIも高かった。上川中部の流出圏は入院・外来とも北空知へのMPIが高かった。流入圏は入院・外来とも3次医療圏の圏域でMPIが顕著に高かった。MPIと流出率との比較では選好度と流出圏が異なる結果となった。結論：MPIによって患者の特定地域への移動選好度や患者移動圏を定量的に評価できた。Purpose: To analyze migration of in- and out-patients by using the migration preference index (MPI) and evaluate the migration preference patterns of specific areas. Method: Secondary medica...
• 110 胸痛患者における冠動脈CT検査の費用効果分析の試み(医療情報管理 HIS,RISほか,第36回日本放射線技術学会秋季学術大会)

  岩田 邦弘, 村上 昇, 小笠原 克彦 日本放射線技術學會雜誌 64 (9) 1094 -1094 2008年09月20日
• 医学用語抽出モジュールの開発—放射線読影レポートを対象として

  西本尚樹, 寺江聡, 上杉正人, 寺下貴美, 小笠原克彦, 遠藤晃, 櫻井恒太郎 医療情報学連合大会論文集 27th 376-377 2007年11月23日 [査読無し][通常論文]
  
• 看護業務タイムスタディにおける業務間遷移確率を用いたシミュレーション

  寺下 貴美, 佐藤 ひとみ, 遠藤 晃, 石井 英樹, 西本 尚樹, 上杉 正人, 小笠原 克彦, 櫻井 恒太郎, 前沢 政次 医療情報学連合大会論文集 27回 306 -309 2007年11月 [査読無し][通常論文]
  
• 公立病院の放射線診療の効率性分析

  小笠原 克彦, 谷川 琢海, 大場 久照, 寺下 貴美, 遠藤 晃, 櫻井 恒太郎 医療情報学連合大会論文集 27回 399 -400 2007年11月
• 医療用語抽出のための用語分割点の探索

  上杉 正人, 西本 尚樹, 谷川 琢海, 大場 久照, 寺下 貴美, 遠藤 晃, 小笠原 克彦, 櫻井 恒太郎 医療情報学連合大会論文集 27回 692 -693 2007年11月
• ジニ係数による小児科医師の地域偏在分析

  谷川 琢海, 大場 久照, 小笠原 克彦, 櫻井 恒太郎 医療情報学連合大会論文集 27回 1195 -1196 2007年11月
• 259 胸痛患者における薬物負荷造影心筋血流MRI検査の費用効果分析の試み(医療情報管理教育・評価分析・他, 第35回日本放射線技術学会秋季学術大会プログラム)

  岩田 邦弘, 窪田 誠, 増田 憲昭, 小笠原 克彦 日本放射線技術學會雜誌 63 (9) 1050 -1050 2007年09月20日
• 青森県における医療サービスのアクセシビリティ評価

  大場 久照, 谷川 琢海, 小笠原 克彦, 櫻井 恒太郎 病院管理 44 (0) 81 -81 2007年09月01日 [査読無し][通常論文]
  
• Selection of Image Transmission System for Visiting Nursing by Analytic Hierarchy Process Model

  Proceeding of International Symposium on Humanaized Systems 173 -176 2007年 [査読無し][通常論文]
  
• 画像診断レポートにおける文字間遷移確率の分布

  西本尚樹, 上杉正人, 寺江聡, 谷川琢海, 寺下貴美, 遠藤晃, 小笠原克彦, 櫻井恒太郎 医療情報学連合大会論文集 26th 816-817 -817 2006年10月30日 [査読無し][通常論文]
   

  日本語の医学用語の単語間境界判定が困難なことから、判定を容易にするため、文字間の連接確率の算出と単語境界の分布調査を試みた。北海道大学病院における100件のCT読影レポートから形態素解析を行った後、診療放射線技師が単語境界を修正した。修正データより、uni-gram、bi-gram及びtri-gramとして文字間の遷移確率を算出した。その結果、uni-gramでは26036文字より646種の文字種が得られ、文字数と比較して文字種が少なかった。単語をベースにした形態素解析に関しては、解析対象文中において辞書に未登録の単語が発生し、全文解析を行うには辞書の語彙数が無限大となる可能性が示唆された。一方で、文字間の遷移確率を用いることにより辞書の語彙数は有限個に制限することが可能と思われた。
• 地域医療システム 患者フローと施設配置 北海道における小児救急医療機関の配置分析

  谷川 琢海, 大場 久照, 上杉 正人, 寺下 貴美, 西本 尚樹, 小笠原 克彦, 櫻井 恒太郎 医療情報学連合大会論文集 26回 36 -38 2006年10月 

  北海道における小児急病センターの数と配置について検討するため、患者の移動距離に着目したモデルの構築とGIS(地理情報システム)を利用した医療機関の適正配置について分析した。ミニ・サム型施設配置モデルと、ミニ・マックス型施設配置モデルの2つの手法を適用して患者の最大移動距離を最小化するような施設の配置と、各施設が受け持つ圏域を求めた。ミニ・サム型施設配置モデルを適用し、配置する施設の数を増加させると平均移動距離、最大移動距離はともに単調減少した。ミニ・マックス型施設配置モデルを適用し、施設の数を増加させると最大移動距離は連続的に単調減少し、施設の数を6としたときに165km、その後施設の数を増やすと施設の数が18のときに100kmを下回り、施設の数が21のときに91kmとなった。
• 地域医療システム 患者フローと施設配置 地理情報システム(GIS)を用いた北海道における二次医療圏の圏域分析

  大場 久照, 小笠原 克彦, 谷川 琢海, 西本 尚樹, 遠藤 晃, 櫻井 恒太郎 医療情報学連合大会論文集 26回 47 -48 2006年10月 

  地理情報システム(GIS)を用いて受療動向、通勤通学動向、買物動向の分析を行い、北海道における現在の21二次医療圏の圏域を検証し、新たな二次医療圏を提案した。二次医療圏別およびに入院・外来別に算出したPIより、現在の二次医療圏で医療が完結していない市町村の大部分は圏域境界に位置した。7二次医療圏の7町2村で二次医療圏の見直しが必要とされ、新しい二次医療圏を提案した。
• 小児救急病院を選択するための評価項目の優先度に関する分析 階層分析法を用いた保護者へのアンケート調査

  谷川 琢海, 小笠原 克彦, 大場 久照, 上杉 正人, 西本 尚樹, 寺下 貴美, 遠藤 晃, 櫻井 恒太郎 医療情報学連合大会論文集 26回 325 -326 2006年10月 

  地域住民の視点から、小児の救急医療体制において重要となる評価基準を明らかにすることを目的として、階層分析法により分析した。調査は2006年1,2月に、岩見沢市の四つの幼稚園に通う3歳から5歳迄の子供のいる保護者を対象とし、調査票を配布して行った。上位2階層(総合目的と評価基準)に着目して分析を行い、総合目的は「子供が急病の時の医療機関の選択」とした。評価基準は予備調査などから七つを選択した。有効回答数は73であった。各評価基準の重要度を比較したところ、「小児科の医師がいること」が全体の4割を占め、比較的大きかった他の評価基準「病院の評判が良い」「以前に受診したことがある」を4倍以上引き離していた。保護者は小児科専門医の診療を望んでおり、小児科医の存在が保護者の安心につながっていると考えられた。
• 仮想評価法(CVM)による小児遠隔医療の効果予測 保護者へのアンケート調査による地域比較

  小笠原 克彦, 谷川 琢海, 大場 久照, 櫻井 恒太郎 医療情報学連合大会論文集 26回 390 -391 2006年10月 

  小児科医と非小児科医との間で小児遠隔医療システムを導入することの利点について、患者の視点から評価した。この評価のため、岩見沢市又は南富良野町に居住し、2〜5歳の子供を持つ両親に対して、仮想評価法(CVM)を用いたアンケート調査を実施した。更に、ロジットモデルによって以下の項目に対する支払意思額(WTP)を推測した。1)住居地、2)年齢層(30歳代以下、40歳代以上)、3)遠隔地医療の認知度。その結果、岩見沢市と南富良野町のWTPは岩見沢市が南富良野町のそれより高く、30歳代以下と40歳代以上のWTPは40歳代以上が30歳代以下より高かったが、これらの差はいずれも世帯収入との関連性が認められた。一方、遠隔医療の認知度による分類では「知っている」が「知らない」より高かったが、世帯収入との間に関連性は認められなかった。
• 看護業務タイムスタディのセグメント時系列解析 業務改善の効果の3次元スペクトルアレイによる視覚化

  寺下 貴美, 佐藤 ひとみ, 遠藤 晃, 石井 英樹, 高橋 久美子, 孫 芹先, 谷川 琢海, 西本 尚樹, 上杉 正人, 小笠原 克彦, 櫻井 恒太郎 医療情報学連合大会論文集 26回 414 -417 2006年10月 

  タイムスタディで得られたデータを人員と時間毎に配置し、業務グループ毎に色分けして視覚的に分かりやすく表示する業務分布図を開発した。更に、最大エントロピー法を用いた周波数解析を行い、業務に内在する周期的特徴を明らかにしたが、業務の基点を表している位相の情報を抽出できなかった。そこで、位相の情報を明らかにするため、変動する周期的特徴の推移を抽出できるセグメント時系列解析を加えた分析を行い、業務改善の前後の相違を評価できるか検討した。その結果、タイムスタディの時系列解析によって周期的特徴の時間的推移を抽出でき、三次元スペクトルアレイで視覚化することで容易に認識できた。この手法を用いて業務改善の前後で周期的特徴の変化を比較し、新たなタイムスタディの評価が可能と思われた。
• Latent Semantic Analysisによる病名の類似度計測循環器病名と消化器病名の分離

  上杉 正人, 小笠原 克彦, 西本 尚樹, 谷川 琢海, 寺下 貴美, 櫻井 恒太郎 医療情報学連合大会論文集 26回 542 -543 2006年10月 

  病名を含む医療用語が複合語であることに注目し、潜在的意味解析(latant semantic analysis:LSA)の手法を用いて、病名とその文字の共起性から類似関係を調べ、分離・分類することを試みた。医療用語の意味の近さを定量評価する実験のためには、雑誌「循環器科」の抄録のタイトルから循環器病名の61語を取り出し対象とし、雑誌「日本消化器外科学会雑誌」の抄録のタイトルから消化器病名の82語を取り出し対象とした。そし病名と分解した文字を行と列にして共起性関係を行列にし、LSAを実施して病名群のベクトルから各病名に最も近い意味の病名を計算した。全体で127語(88.8%)がLSAにより正しく消化器病名群と循環器病名群に分離することができた。
• 医療文書から医療用語の分離抽出 単語長をパラメータとした新聞社説との相互比較

  上杉 正人, 小笠原 克彦, 西本 尚樹, 谷川 琢海, 寺下 貴美, 櫻井 恒太郎 医療情報学連合大会論文集 26回 820 -821 2006年10月 

  計算機システムに蓄積された医療データの再利用は医療の質の向上につながると考え、医療用語の分離抽出方法について検討した。1000例の症例報告と3年分及び16年分の新聞社説より2文字以上の漢字及びその前後のカタカナ文字列から成る対象単語群を抽出し、その中から医療用語を抽出した。その結果、症例報告では抽出した医療単語は77.3%で、社説を3年分から16年分に増やしたところ、各々の抽出精度は84.3%及び85.9%と改善が認められた。一方で、再現率は3年分の社説が98.4%、16年分の社説が95.8%と低下が認められた。単語長の長さが増えると共に医療用語の割合が増加したが、16語以上になると、低下する傾向にあった。医療用語中に不必要な漢字の負荷を認めた単語は約2割であった。今後、カタカナのみならず、ひらがなや英文字を含めた抽出を試みる必要がある。
• 複合語を構成する医学用語間の意味関係の同定における課題—CT画像診断レポートに出現する複合語を対象として—

  西本尚樹, 寺江聡, JIANG G, 上杉正人, 寺下貴美, 谷川琢海, 遠藤晃, 小笠原克彦, 櫻井恒太郎 医療情報学 25 (6) 413-420 -420 2006年06月20日 [査読無し][通常論文]
   

  本研究ではontologyのため，医学文書の記述的な特徴を把握することを目的として，複合語を構成する医学用語の概念関係を調査した．北大病院のある1カ月に作成されたCT画像診断レポートより無作為に抽出された100件から，本文から医学用語を抽出し，UMLSのsemantic type/groupおよびrelationを付加した．抽出された医学用語の複合語のうち，semantic relationが定義されていた複合語は29.9％，定義されていなかった複合語は70.1％であった．要因として，UMLSで定義された日本語の概念名が少ないためではないかと考えられる．更に，semantic relationはまだ十分に記述されておらず，ontology構築には別の分類と組み合わせる必要があることが明らかになった．
• Model analysis for optimal allocation of pediatric emergency center.

  Tanikawa T, Ohba H, Terashita T, Uesugi M, Jiang G, Ogasawara K, Sakurai T AMIA ... Annual Symposium proceedings / AMIA Symposium. AMIA Symposium 1115 -1115 2006年 [査読無し][通常論文]
   

  Optimal allocation of Pediatric Emergency Centers was simulated using both Min-Sum model and Min-Max model, based on the travel distance and child population of Hokkaido prefecture, Japan. Our result should be helpful to select the optimal number and allocation of PECs in the actual scene of decision making, where the financial restriction exists.
• Semantic distribution study of noun*noun compounds in the Japanese CT clinical reports.

  Nishimoto N, Satoshi T, Jiang G, Uesugi M, Terashita T, Tanikawa T, Endou A, Ogasawara K, Sakurai T AMIA ... Annual Symposium proceedings / AMIA Symposium. AMIA Symposium 1048 -1048 2006年 [査読無し][通常論文]
   

  The purpose of this study is to investigate the distribution of the semantic relationships between the two atomic medical terms of the noun-noun compounds extracted from the clinical documents in Japanese. Only 29.9% of the compounds had the UMLS semantic relation defined (mainly including "location_of" and "adjacent_to"). The results indicated that the semantic relations defined in the UMLS semantic network are not enough for describing the noun-noun medical compounds extracted from the Japanese clinical reports.
• 冠動脈造影における冠動脈起始の統計学的分類に関する検討

  アールティ (32) 15 -19 2006年 [査読無し][通常論文]
  
• Semantic Distribution Study of Noun-noun Compounds in Japanese Radiological Abstract

  Proceedings of First International Conference on Kansei Engineering & Intelligent System 248 -251 2006年 [査読無し][通常論文]
  
• Measuring Closeness of Meaning among Disease Words with Latent Semantic Analysis

  Proceedings of First International Conference on Kanse Engineering & Intelligent System 252 -256 2006年 [査読無し][通常論文]
  
• 看護業務タイムスタディーにおける最大エントロピー法を用いた時系列分析

  寺下 貴美, 佐藤 ひとみ, 遠藤 晃, 高橋 久美子, 孫 芹先, 谷川 琢海, 西本 尚樹, 上杉 正人, 小笠原 克彦, 櫻井 恆太郎 医療情報学連合大会論文集 25回 404 -407 2005年11月
• ミニ・マックス型モデルを用いた救急医療機関の適正配置 北海道の小児急病センターを事例としたモデルの構築と分析

  谷川 琢海, 上杉 正人, 小笠原 克彦, 大場 久照, 寺下 貴美, 西本 尚樹, 櫻井 恒太郎 医療情報学連合大会論文集 25回 788 -789 2005年11月
• 画像診断領域の論文抄録に含まれる複合語の意味的分布の調査

  西本 尚樹, 蒋 国謙, 寺下 貴美, 上杉 正人, 谷川 琢海, 小笠原 克彦, 櫻井 恒太郎 医療情報学連合大会論文集 25回 970 -971 2005年11月
• ラフ集合によるインシデントレポートからのインシデント発生要因の分析

  小笠原 克彦, 寺下 貴美, 西本 尚樹, 谷川 琢海, 上杉 正人, 大場 久照, 佐藤 ひとみ, 蒋 国謙, 遠藤 晃, 櫻井 恒太郎 医療情報学連合大会論文集 25回 1106 -1107 2005年11月
• 包絡分析法(DEA)による地域医療の効率性の分析 遠隔医療の導入のための北海道道南3次医療圏を事例とした地域評価

  谷川 琢海, 大場 久照, 小笠原 克彦, 櫻井 恒太郎 日本遠隔医療学会雑誌 1 (1) 124 -125 2005年10月 

  遠隔医療システムの導入が有効な地域を明らかにすることを目的に,経営工学の分野で用いられているDEAを地域医療に適用し分析を行った.医療資源(医療機関数,病床数,医師数)を入力とし,患者数(外来,入院)を出力として地域医療の効率性の評価値を求めた.北海道道南地方の27市町村を事例として分析した結果,7町村に遠隔医療を導入することが,地域医療を支援するために有効であると考えられる.今後は,モデルの妥当性を更に検討し,地域性や時期を考慮した詳細な分析が必要である
• 患者受療動向に関する指標の考案と分析 北海道の二次医療圏を対象として

  大場 久照, 小笠原 克彦, 谷川 琢海, 櫻井 恒太郎 病院管理 42 (Suppl.) 167 -167 2005年08月
• FCA View Tab: A concept-oriented view generation tool for clinical data using formal concept analysis

  Proceedings of the 8th International Protege Conference 91 -93 2005年 [査読無し][通常論文]
  
• テキストマイニングを用いた自由記載入力型看護記録の分析

  遠藤 晃, 佐藤 ひとみ, 高橋 久美子, 寺下 貴美, 櫛引 一則, 鈴木 研祠, 小笠原 克彦, 櫻井 恒太郎 医療情報学連合大会論文集 24回 716 -717 2004年11月 [査読無し][通常論文]
  
• 移動選択指数を用いた患者移動の地域的選択性 北海道を例として

  大場 久照, 小笠原 克彦, 谷川 琢海, 西本 尚樹, 蒋 国謙, 遠藤 晃, 櫻井 恒太郎 医療情報学連合大会論文集 24回 494 -495 2004年11月
• 最短路解析モデルを用いた小児急病センターの適正配置 北海道を事例としたモデルの構築と分析

  谷川 琢海, 寺下 貴美, 小笠原 克彦, 大場 久照, 西本 尚樹, 櫻井 恒太郎 医療情報学連合大会論文集 24回 500 -501 2004年11月
• インシデント報告に対するデータマイニングを用いた要因分析の試み

  寺下 貴美, 谷川 琢海, 遠藤 晃, 住吉 一宏, 廣田 稔, 小笠原 克彦, 福島 洋子, 河野 龍太郎, 櫻井 恒太郎, 加藤 紘之 医療情報学連合大会論文集 24回 644 -645 2004年11月
• 標準病名辞書による画像診断用語の形態素解析

  西本 尚樹, 谷川 琢海, 蒋 国謙, 小笠原 克彦, 櫻井 恒太郎 医療情報学連合大会論文集 24回 812 -813 2004年11月
• DEA法によるCT・MRIの分布の非効率性に関する検討 2次医療圏を対象として

  小笠原 克彦, 大場 久照, 谷川 琢海, 西本 尚樹, 櫻井 恒太郎 医療情報学連合大会論文集 24回 1162 -1163 2004年11月
• 携帯電話・携帯端末による訪問医療支援システムの開発

  小笠原 克彦, 堀 享一, 小林 巧, 上田 将之, 奥原 芳子, 安達 妙子, 住吉 一宏 医科学応用研究財団研究報告 21 45 -48 2004年02月 [査読無し][通常論文]
   

  携帯電話・携帯端末による訪問医療支援システムの開発の一環として,2種類の動画伝送システムを構築し,基礎評価実験・臨床評価実験を通じて訪問看護・遠隔リハビリテーションへの臨床応用の技術的な可能性を検討した.さらに,実際の訪問看護での臨床評価を行い,携帯電話を遠隔医療に用いる際の技術的な問題点及び携帯電話を用いた遠隔医療を普及させるための社会経済的な問題点を中心に検討した.リアルタイムシステム及びファイル保存システムの両システムにおいて,手ブレや逆光などの撮影条件を考慮すれば実用可能であった.リアルタイムシステムとファイル保存システムの比較では,画質に関してはファイル保存システムが優れていたが,リアルタイムシステムの動画と音声両方がリアルタイムに伝達できるという機能の有用性は極めて大きかった
• Movie transmission systems using movie cellular phones

  Home Health Care Technology Report 66 -74 2004年 [査読無し][通常論文]
  
• ISM法によるCRシステム導入要因の構造化分析

  小笠原 克彦, 大場 久照, 谷川 琢海, 蒋 国謙, 櫻井 恒太郎 医療情報学連合大会論文集 23回 331 -332 2003年11月
• 特異日における誕生数の経年変化について 病院受診患者を対象とした調査

  谷川 琢海, 小笠原 克彦, 大場 久照, 蒋 国謙, 遠藤 晃, 櫻井 恒太郎 医療情報学連合大会論文集 23回 635 -636 2003年11月
• エントロピーを用いた患者動態の定量的分析 北海道の二次医療圏を事例として

  大場 久照, 小笠原 克彦, 谷川 琢海, 蒋 国謙, 遠藤 晃, 櫻井 恒太郎 医療情報学連合大会論文集 23回 867 -868 2003年11月
• 肝臓移植の医療技術評価 患者のQOL測定の試み

  小笠原 克彦, 今井 博久, 萩原 邦子, 藤堂 省, 古川 博之, 櫻井 恒太郎, 玉城 英彦, 藤田 博美 医療情報学連合大会論文集 22回 137 -138 2002年11月
• 遠隔医療での携帯電話利用－遠隔リハビリテーション実験から

  新医療 29 (12) 134 -136 2002年 [査読無し][通常論文]
  
• 微小球ファントムによるCT3D画像の視覚評価－一対比較法による形状認識評価の試み－

  小笠原 一洋, 谷川 琢海, 小笠原 克彦, 小山 美秀, 坂田 元道 北海道放射線技術学会雑誌 62 (62) 21 -25 2002年 [査読無し][通常論文]
   

  単一の閾値設定で簡単に画像構成ができるshaded surface display(SSD)法により作成した3D画像を用い,3D画像作成時の閾値が3D画像の形状認識に及ぼす影響を検討するため,一対比較法による3D画像の形状認識の相対的な尺度化を試みた.適合度・一致性・一貫性に関して検討の余地はあるが,一対比較法による3D画像の形状認識の尺度化が可能であった.ファントム球とその周囲の物質のCT値が近い場合,閾値を変化させても形状認識に差が生じなかったが,病変と周囲のCT値が大きい場合,閾値による形状認識に差が生じると考えられた
• 医用画像管理とテレラジオロジーの経済性－放射線画像データ量に関する調査研究

  Digital Medicine 3 (2) 55 -57 2002年 [査読無し][通常論文]
  
• Influence of the threshold values of 3D CT images on the shape recognition

  Proceeding of the International Symposium- Toward a Development of KANSEI Technology 149 -152 2001年 [査読無し][通常論文]
  
• デジタル色画像の画像分解能が読影判断に及ぼす影響 : 赤色擬似病変を用いたROC実験

  小笠原 克彦, 伊藤 久仁子, 蒋 国謙, 遠藤 晃, 櫻井 恒太郎, 谷 重喜, 福原 康行 医療情報学連合大会論文集 20 530 -531 2000年11月23日
• EBM導入のためのワークフロー解析の試み

  蒋 国謙, 小笠原 克彦, 遠藤 晃, 櫻井 恒太郎 医療情報学連合大会論文集 20 (0) 390 -391 2000年11月23日 [査読無し][通常論文]
  
• 操作性を考慮した訪問リハビリテーション動画伝送システムの構築と評価 : 携帯電話を使用した簡易型システム

  伊藤 久仁子, 小笠原 克彦, 遠藤 晃, 蒋 国謙, 住吉 一宏, 佐藤 ひとみ, 奥原 芳子, 遠藤 曜子, 足立 妙子, 堀 享一, 櫻井 恒太郎 医療情報学連合大会論文集 20 (0) 730 -731 2000年11月23日 [査読無し][通常論文]
  
• 階層分析法による訪問看護動画像伝送システムの携帯端末の選択基準に関する検討

  小笠原 克彦, 伊藤 久仁子, 蒋 国謙, 遠藤 晃, 佐藤 ひとみ, 櫻井 恒太郎 医療情報学連合大会論文集 20 (0) 754 -755 2000年11月23日 [査読無し][通常論文]
  
• How well do clinicians use computer-based information for clinical practice? Postal survey of clinicians' views in Japan

  GQ Jiang, K Ogasawara, A Endoh, T Sakurai JOURNAL OF THE AMERICAN MEDICAL INFORMATICS ASSOCIATION 1038 -1038 2000年 [査読無し][通常論文]
  
• マンモグラフィの被曝線量評価と最適撮影条件設定

  電子情報通信学会技術研究報告 100 (287) 37 -42 2000年 [査読無し][通常論文]
  
• デジタルカメラによる色画像の分解能が読影判断に及ぼす影響

  INNERVISION 15 (13) 21 -23 2000年 [査読無し][通常論文]
  
• 北海道における放射線診療の地域分布解析

  小笠原 克彦, 南部 敏和, 伊達 広行, 遠藤 晃, 櫻井 恒太郎, 宮坂 和男 放射線医学物理 60 (0) 1999年04月 [査読無し][通常論文]
  
• Numerical Model of Compressed Breast for the Japanese Women; For the dose simulation of Mammography

  Proceeding of the 2nd Japan-Korea Joint Meeting on Medical Physics 376 -378 1999年 [査読無し][通常論文]
  
• 北大病院における遠隔医療と情報ネットワークの試み

  北海道医学雑誌 74 267 -272 1999年 [査読無し][通常論文]
  
• 253 テレ・ラジオロジーに関する診療放射線技師の意識調査 : 北海道におけるアンケート結果

  小笠原 克彦, 遠藤 晃, 寺江 聡, 桜井 恒太郎, 宮坂 和男 日本放射線技術學會雜誌 54 (9) 1135 -1135 1998年09月20日 [査読無し][通常論文]
  
• 291 マンモグラフィにおける被曝線量 : 圧迫乳房の数値モデルの作成と評価

  高橋 秀樹, 小笠原 克彦, 山崎 裕子, 伊達 広行, 下妻 光夫, 森田 穣 日本放射線技術学会雑誌 54 (9) 1147 -1147 1998年
• Evaluation of the acceptable JPEG-compression ratio of chest X-ray; Using the method of paired comparison

  K Ogasawara, Y Ando, M Kitamura, S Terae, T Sakurai CAR '98 - COMPUTER ASSISTED RADIOLOGY AND SURGERY 1165 895 -895 1998年 [査読無し][通常論文]
  

受賞

• 2021年 北海道大学大学院保健科学研究院 優秀論文賞
  
• 2021年 日本放射線技術学会 北海道支部 学術賞
  
• 2017年 北海道大学 総長賞(奨励賞)
  
• 2012年 北海道大学大学院保健科学研究院 研究院長賞
  
• 2008年 日本放射線技術学会 滝内賞
  

共同研究・競争的資金等の研究課題

• 多次元先端映像解析を駆使した顕微鏡手術「複雑性」の解明

  日本学術振興会：科学研究費助成事業

  研究期間 : 2021年04月 -2026年03月 

  代表者 : 杉山 拓, 杉森 博行, 松澤 等, 小笠原 克彦, 藤村 幹, 伊東 雅基

   

  本研究の目的は、外科手術の機能や安全性、術者スキルに関わる重要な要素を探索することであり、この先にアウトカム予測、有害イベント予測、術者スキル評価AIなどを目指すものである。 令和3年度は、頚動脈狭窄症に対する動脈内膜剥離術に焦点を当て、手術映像の解析に着手した。頚動脈を剥離する際の、頚動脈の動き（加速度）に着目し、これを手術映像から測定することで、“組織に対する愛護的な手術操作”の新たな指標と仮定した。１１７例の頚動脈内膜剥離術中映像の網羅的解析により、この新たな指標が、手術スキルおよび手術合併症に相関することが証明された。また、この指標を用いることにより、どの様な手術剥離法が客観的に有用であるか（組織に対して愛護的であるか）を示すことが可能になった。さらには、このような手術パフォーマンスの指標が、従来の研究で多く用いられてきた患者側の指標と同等以上に、治療成績にも相関することが多変量解析の結果からも証明し得た。本研究結果を、現在英語論文として投稿準備中である。 また、微小脳血管吻合のトレーニング映像を用いて、術具の先端を自動追跡する深層学習アルゴリズム、手術操作の対象となる微小血管をセグメンテーションするアルゴリズムの作成を開始し、おおむね精度の高いアルゴリズムが形成されてきている。これらを用いて、術具の軌道分析や、患者組織の変形分析などを行い、術者レベルや血管吻合成否に関与する因子の網羅的探索を継続している。
• レセプトデータによる医療・介護の経済分析と将来予測：GISによる可視化とAI予測

  日本学術振興会：科学研究費助成事業

  研究期間 : 2022年04月 -2025年03月 

  代表者 : 小笠原 克彦
• 膀胱がんサバイバーの術前意思決定サポートツールの開発

  日本学術振興会：科学研究費助成事業

  研究期間 : 2022年04月 -2025年03月 

  代表者 : 丸山 覚, 伊藤 陽一, 大澤 崇宏, 小笠原 克彦
• 通いの場における状態別の口腔機能向上・栄養改善プログラムに関する地域介入研究

  日本学術振興会：科学研究費助成事業

  研究期間 : 2020年04月 -2025年03月 

  代表者 : 山崎 裕, 渡邊 裕, 本川 佳子, 玉腰 暁子, 小笠原 克彦

   

  COVID-19の感染拡大により本研究事業の主体となる北海道岩見沢市の「げんき発見ドック」の開催時期が当初の予定の９月から10月末に延期となったが、感染対策を徹底し高齢者232名の参加を得てベースライン調査を行った。調査内容は感染対策を考慮し、すべて実施することはできなかったが、COVID-19の生活等への影響に関する調査項目を追加し実施した。横断データの分析においては、COVID-19による外出機会の減少はフレイルと関係していること、血中ビタミンD濃度とフレイルが関係していることが明らかになった。また、口腔に関しては、採取した唾液の細菌叢解析を行い、口腔カンジダに関する口腔内細菌叢の悪化とオーラルフレイルとの関連が認められた。また、COVID-19に関連したストレス、運動習慣の状況と包括的口腔関連QOL尺度（GOHAI）との関係を検討した。ロジスティック回帰分析の結果では、他の因子の影響を調整しても、GOHAIとCOVID-19ストレスおよび運動習慣の問題（オッズ4.38）と有意な関連が認められた。結果、COVID-19由来のストレスと運動習慣の欠如が合併することで口腔関連QOLの低下に繋がる可能性が示唆された。 「げんき発見ドック」に参加した232名を対象に、歯科衛生士、管理栄養士による口腔機能向上・栄養改善プログラムと食事栄養指導を6カ月間実施する予定であったが、通いの場がCOVID-19によって自粛となったことから、自宅でのセルフプログラムと郵送によるプログラム実施状況の確認、フィードバックを実施している。3月に実施予定だった事後評価も感染拡大によって中止となり、事後評価は2021年9月に実施予定となった。郵送によるプログラム実施状況の確認とフィードバックをもとにセルフプログラムの等問題点の抽出、改訂を適宜実施している。
• NDBからの糖尿病生活習慣改善因子の因果関係の可視化と医療費シミュレーション

  日本学術振興会：科学研究費助成事業

  研究期間 : 2018年04月 -2022年03月 

  代表者 : 小笠原 克彦

   

  近年、国民医療費は増加傾向にある。特に、生活習慣病と関連の深い2型糖尿病は合併症の誘発を引き起こしやすく、罹患した患者は医療費が高額になることが予想される。そこで本研究においては、地域における糖尿病患者の生活習慣の改善への効果的な支援を行うこと、またその支援の効果指標の提案を目的として、糖尿病患者の「生活習慣の改善意思」に影響を与える因子および地域性の特徴をベイジアンネットワーク可視化し、生活習慣の改善によって期待される行動変容の効果について検討した。マルコフモデルを用いた糖尿病における血糖値コントロール自己管理遠隔アプロケーションによる費用効果分析を試みた。
• 膀胱がんサバイバーの患者立脚型アウトカムを適切に測定できるQOL評価法の確立

  日本学術振興会：科学研究費助成事業

  研究期間 : 2018年04月 -2021年03月 

  代表者 : 大澤 崇宏, 伊藤 陽一, 安部 崇重, 篠原 信雄, 小笠原 克彦

   

  本研究では、経尿道的手術、膀胱全摘、化学放射線療法と治療方法が多岐にわたる膀胱がんに着目し、海外で広く利用されているBladder Cancer Index（BCI）を翻訳し、日本語版BCIの妥当性および信頼性を検証することを目的とした。また、膀胱がんの治療方法がその後のHealth-related quality of life（HRQOL）にどのような影響を及ぼしているのかを国内多施設共同研究および国際間の比較を行った。
• 病院と連携する在宅遠隔相談看護師のアセスメント能力向上プログラムの開発と検証

  日本学術振興会：科学研究費助成事業

  研究期間 : 2015年04月 -2018年03月 

  代表者 : 良村 貞子, 下田 智子, 小笠原 克彦, 吉田 祐子, 鈴木 哲平, 堤 香織, 高橋 紀子, 寒川 美奈, 田村 菜穂美, 佐藤 ひとみ, 船木 典子, 新岡 郁子

   

  看護師のアセスメント能力の向上には、健康相談希望者に関する情報収集能力と的確な分析力の向上が必要である。本研究では、遠隔健康相談を希望する地域住民のＢＭＩ、食事の摂取量と内容、自己採血データ、筋肉量等の体組成、日常生活習慣などのデータを、相談担当の在宅看護師と共有できる、個人情報を保護したデータ管理システムを開発した。在宅看護師による各データの分析のシミュレーション研修は、健康相談者とデータを共有しながらの、在宅看護師による問診および視診において、効率的で効果的であった。
• 放射線健康情報はどのように時間的・空間的に広がるのか？

  日本学術振興会：科学研究費助成事業

  研究期間 : 2014年04月 -2016年03月 

  代表者 : 小笠原 克彦

   

  災害時において放射線に関する情報や風評被害などの誤った情報を受け取るということ は更なる混乱を招くことに繋がりかねない。今後、福島原発事故のような事故が起こった場合、市民の混乱を避けるために対処できるようにする必要がある。 そこで本研究においては、Twitterと新聞記事の感性分析、Twitterの地域性分析・感性分析、Twitterの共起ネットワーク分析、を行った。その結果、市民の放射線に対するイメージに加え、市民の放射線に関する情報の発信の地域性と時間的経過を明らかにした。
• 潜在看護職者の在宅ワークと連携する遠隔健康相談システムの開発と検証

  日本学術振興会：科学研究費助成事業

  研究期間 : 2012年04月 -2015年03月 

  代表者 : 良村 貞子, 下田 智子, 小笠原 克彦, 岡崎 光洋

   

  高精度ＴＶ会議システムを活用し、大震災で被災した宮古、気仙沼、大船渡、石巻を含む全国9か所の調剤薬局に送信機器を、大学に受信機器を設置し、実務経験10年以上の看護職者を相談員として遠隔健康相談を行った。相談の内容は血圧、体重コントロールや食事、育児、皮膚のトラブルおよび糖尿病の自己管理など多様であった。 遠隔健康相談員の確保は容易でなかった。健康相談では個人情報保護が重要となるため、新たなクラウドを活用し、他者がアクセスできない状況で、潜在看護職者の協力を得て、在宅での受信時にiPadを活用し、問診、視診が実施可能か検証を行った。iPadは健康相談には十分活用可能であることが明らかとなった。
• ＧＩＳに組み込んだシステム・ダイナミクスによる医療環境の予測と可視化

  日本学術振興会：科学研究費助成事業

  研究期間 : 2011年 -2013年 

  代表者 : 小笠原 克彦

   

  本研究ではシステム・ダイナミクスにより北海道2次医療圏・診療科の医師数、および診療放射線技師数の予測を行った。更に、地図情報システム（GIS）に北海道2次医療圏の医師数の予測結果を組み込み、地域毎の医師数の可視化と、ジニ係数による北海道内での地域偏在と診療科の偏在の検討を行った。また、関連した研究として、地域における産業の活性度等を考慮した医療提供体制の評価を行うことを目的とし、北海道の各市町村における産業等を考慮した地域活性度と、医療体制の充実度を示す医療活性度を算出した。各活性度を地図上に可視化することで、地域性の検討を試みた。
• 地域保健医療福祉計画の策定・評価における地理情報システムの応用に関する研究

  日本学術振興会：科学研究費助成事業

  研究期間 : 2009年 -2011年 

  代表者 : 大場 久照, 小笠原 克彦, 谷川 琢海

   

  本研究では、都道府県医療・介護計画の策定・評価への地理情報システム(GIS)の適用について検証した。その結果、(1)青森県での入院患者の受療動向分析により地域医療政策の影響を受けている、(2)全国の電子カルテシステム導入状況の分析により地域間・病院間の格差拡大と、遠隔医療研究の動向分析により地域と研究分野の偏在、(3)北海道での脳卒中と急性心筋梗塞に関わる診療科医師数の時系列分析と介護資源の統合的分析により地域偏在と連携上の問題を明らかにし、GISの有用性を確認できた。
• 放射線治療の地域格差に関する基礎的研究

  日本学術振興会：科学研究費助成事業

  研究期間 : 2007年 -2009年 

  代表者 : 谷川 琢海, 大場 久照, 笈田 将皇, 小笠原 克彦, 安藤 裕

   

  第3次対がん10カ年総合戦略では、がん医療の「均てん化」を図ることが戦略目標の1つとされている。一方、がん医療水準の地域格差の実態は明らかではなく、全国的ながん医療水準の地域格差の把握は必ずしもなされていない。本研究では放射線治療資源の地域偏在を明らかにすることを目的として分析を行った。その結果、(1)地理情報システム(GIS)を用いて放射線治療医療資源の分布の可視化し、(2)ジニ係数を利用して放射線治療医療資源の地域偏在の大きさを数値的に評価することができた。
• 遠隔医療の医療技術評価-評価モデルの構築とワークフロー解析

  日本学術振興会：科学研究費助成事業

  研究期間 : 2003年 -2005年 

  代表者 : 小笠原 克彦

   

  (1)遠隔医療導入のための小児救急医療の現状評価に関する分析 地域住民の視点から小児の救急医療体制において適切な施設の数と規模を明らかにするために、階層分析法(AHP)により地域住民に対する意識を分析した。AHPは3層とし、評価層には「総合病院」「高度の医療設備がある」「待ち時間が短い」など7項目、代替案は医療機関の規模とし「小規模」「中規模」「大規模」の3案とした。調査対象は、北海道岩見沢市および南富良野町の幼稚園・保育園に通園する子供を持つ親、それぞれ100名、50名とした。回答率は50%強であった。岩見沢市の15名の分析結果では、「小児科医のいる施設」の評価値が最も高く0.38、次いで「病院の評判が良い」が0.16であった。 (2)小児救急医療を代替するための遠隔医療システムの経済性に関する分析 地域住民の視点から小児の救急医療体制を代替する遠隔医療システムの経済性を分析するために仮想評価法(CVM)によるWTP(支払意思額)の算出を試みた。本調査では遠隔医療は患者の診察時に医師が遠隔地にいる医師と通信を行うこと(Doctor to Doctor)を想定し、小児の急病患者の受診時に診察を行う医師が小児科または疾患に対応する専門医と動画像等を用いてコミュニケーションが取れるシステムを仮定した。対象は北海道岩見沢市および南富良野町の幼稚園・保育園に通園する子供を持つ親、それぞれ300名、50名とした。回答率は50%強であった。42人のWTPは4,156円であった。この結果は、今後の遠隔医療の普及を計る上で基礎資料になるものと考えられる。
• 北海道におけるテレ・ラジオロジーの導入効果に関する研究

  日本学術振興会：科学研究費助成事業

  研究期間 : 1999年 -1999年 

  代表者 : 小笠原 克彦

教育活動情報

主要な担当授業

大学運営

学内役職歴

• 2016年4月1日 - 2018年3月31日 環境健康科学研究教育センター長
• 2018年4月1日 - 2020年3月31日 環境健康科学研究教育センター長
• 2020年4月1日 - 2022年3月31日 環境健康科学研究教育センター長

委員歴

• 2022年 - 現在   日本医療情報学会   代表理事(学会長)
• 2020年 - 現在   北海道保健福祉部   医療データ分析センター運営協議会 事務局
• 2018年 - 現在   総務省   北海道の医療機関における電波利用推進協議会 座長
• 2012年 - 現在   日本医療情報学会   理事
• 2010年 - 現在   日本放射線技術学会   編集委員会 副編集委員長   日本放射線技術学会
• 2014年04月 - 2023年03月   日本放射線技術学会   北海道支部 支部長
• 2022年 - 2022年   日本医療情報学会   第42回医療情報学連合大会 大会長
• 2018年 - 2021年   厚生労働省   診療放射線技師国家試験委員会
• 2010年04月 - 2020年03月   日本放射線技術学会   理事   日本放射線技術学会
• 2010年 - 2016年   日本医療情報学会   北海道支部 支部長
• 2014年 - 2014年   日本放射線技術学会   第42回秋季学術大会 大会長