Nihon Hoshasen Gijutsu Gakkai zasshi最新文献

{"title":"[5. Quantitative Cerebral Hemodynamic Assessment Using SPECT and PET in Ischemic Cerebrovascular Disease].","authors":"Kaoru Sato","doi":"10.6009/jjrt.26-0109","DOIUrl":"https://doi.org/10.6009/jjrt.26-0109","url":null,"abstract":"","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"82 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146020931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[1. Utilization of Data and AI in Society (1): Ongoing Social Changes].","authors":"Hiroshi Fujita","doi":"10.6009/jjrt.26-0107","DOIUrl":"https://doi.org/10.6009/jjrt.26-0107","url":null,"abstract":"","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"82 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146020965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Towards the Future of Healthcare: The Resonance of Research and Development Activities].","authors":"Kiyohito Sonoki","doi":"10.6009/jjrt.26-0204","DOIUrl":"https://doi.org/10.6009/jjrt.26-0204","url":null,"abstract":"","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"82 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147277751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Insights Gained Through Research Abroad].","authors":"Tensho Yamao","doi":"10.6009/jjrt.26-0604","DOIUrl":"https://doi.org/10.6009/jjrt.26-0604","url":null,"abstract":"","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"82 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148297581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[4. Concepts of Treatment Planning and the Basics of Optimization for Particle Beam Therapy].","authors":"Masaki Suga","doi":"10.6009/jjrt.26-0602","DOIUrl":"https://doi.org/10.6009/jjrt.26-0602","url":null,"abstract":"","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"82 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148297660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Visualization of Waiting Times and Evaluation of Workload Congestion Mitigation in General Imaging].","authors":"Shirabe Ganjitsuda, Masahiko Toyota","doi":"10.6009/jjrt.26-1663","DOIUrl":"10.6009/jjrt.26-1663","url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to visualize patient waiting times in general radiography using a data-driven approach and to evaluate operational strategies for congestion mitigation in a high-volume clinical setting.</p><p><strong>Methods: </strong>General radiography examination data collected over a 3-year period were retrospectively analyzed. Waiting time was defined as the interval between patient reception and examination start. The overall distribution and characteristics of waiting times were evaluated using inverse cumulative distribution analysis. Factors influencing waiting time were assessed using random forest regression, incorporating examination-related and operational variables. Based on the identified key factors, a discrete-event simulation model was constructed to evaluate the effects of different operational conditions, including staffing levels, on patient waiting time.</p><p><strong>Results: </strong>Inverse cumulative distribution analysis revealed substantial variability in waiting time across examinations. Random forest analysis identified examination type, imaging region, and operator as major contributing factors to waiting time. Discrete-event simulation demonstrated that increasing staffing levels effectively reduced waiting time; however, the magnitude of improvement diminished beyond a certain staffing threshold, indicating limited returns from simple workforce expansion.</p><p><strong>Conclusion: </strong>Data-driven visualization and machine learning-based analysis are effective for understanding waiting time characteristics in general radiography. The findings suggest that congestion mitigation cannot be achieved solely through staffing increases and requires optimized workflow design and operational planning based on empirical data.</p>","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"82 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148297728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[1. The Role of Particle Therapy in Cancer Treatment].","authors":"Nobukazu Fuwa","doi":"10.6009/jjrt.26-0310","DOIUrl":"https://doi.org/10.6009/jjrt.26-0310","url":null,"abstract":"","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"82 3","pages":"86-92"},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147500904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[2. Important Points to Remember about Photography Techniques That You Should Review].","authors":"Tsuyoshi Mori","doi":"10.6009/jjrt.26-0305","DOIUrl":"https://doi.org/10.6009/jjrt.26-0305","url":null,"abstract":"","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"82 3","pages":"77-84"},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147500945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Radiological Science and Society in 2035: Structural Reforms for Sustainable Innovation].","authors":"Special Committee On Future Planning","doi":"10.6009/jjrt.26-0311","DOIUrl":"https://doi.org/10.6009/jjrt.26-0311","url":null,"abstract":"","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"82 3","pages":"44-57"},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147500948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Impact of Contrast Enhancement and Arterial Diameter on CT Values of Virtual Non-contrast Images in Abdominal Dynamic CT Examinations with Fast kV-switching Dual-energy CT].","authors":"Yusuke Uehara, Yuichiro Mori, Kazuhiro Takeuchi, Yasuhiro Ide","doi":"10.6009/jjrt.26-1619","DOIUrl":"https://doi.org/10.6009/jjrt.26-1619","url":null,"abstract":"<p><strong>Purpose: </strong>The purpose of this study was to evaluate the impact of contrast enhancement and arterial diameter on the attenuation values of virtual non-contrast (VNC) images (HU_VNC) obtained from abdominal dynamic computed tomography (CT) examinations using a rapid kilovolt-switching dual-energy CT system.</p><p><strong>Methods: </strong>Seventy-keV virtual monoenergetic (VME) and VNC images were reconstructed from scanned raw data of the unenhanced, arterial, portal, and delayed phases. Circular regions of interest (ROIs) were placed on four arteries of different diameters (abdominal aorta: 20 mmϕ, common iliac artery: 10 mmϕ, superior mesenteric artery: 5 mmϕ, and inferior mesenteric artery: 2.5 mmϕ) at the same anatomical level between each contrast enhancement level. The attenuation values and standard deviations of the VME images (HU_VME) and HU_VNC in each ROI were measured. VNC_Error, the differences between HU_VME in the unenhanced phase and HU_VNC in each contrast enhancement level, was calculated.</p><p><strong>Results: </strong>HU_VME decreased as the contrast enhancement level declined, regardless of the arterial diameter. Similarly, the HU_VME in the same contrast enhancement level decreased as the arterial diameter decreased. This tendency was particularly evident at high contrast enhancement levels. As arterial diameter decreased or the contrast enhancement level increased, HU_VNC and VNC_Error increased. At HU_VME of 400 Hounsfield unit (HU), the maximum VNC_Error was 78.47 HU at 2.5 mmϕ and 6.68 HU at 20 mmϕ. At HU_VME of 130 HU, the influence on HU_VNC was smaller than at other contrast enhancement levels, with VNC_Error of no more than 13.67 HU at 2.5 mmϕ.</p><p><strong>Conclusion: </strong>This study suggests that HU_VNC increases are significantly affected by both the contrast enhancement and arterial diameter, especially at high contrast enhancement levels and in narrow arteries.</p>","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"82 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147791393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}