Nihon Hoshasen Gijutsu Gakkai zasshi最新文献_第10页

[Questionnaire Survey on IVR Dose Management in Tokai Region]. 东海地区IVR剂量管理问卷调查

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-01-20 Epub Date: 2023-11-15 DOI: 10.6009/jjrt.2024-1342

Mitsuharu Osawa, Akinori Nagata, Takaya Saijo, Tsuyoshi Yamada, Naruto Sugimoto, Akira Tokudome, Kosuke Suzuki, Hajime Sakamoto

{"title":"[Questionnaire Survey on IVR Dose Management in Tokai Region].","authors":"Mitsuharu Osawa, Akinori Nagata, Takaya Saijo, Tsuyoshi Yamada, Naruto Sugimoto, Akira Tokudome, Kosuke Suzuki, Hajime Sakamoto","doi":"10.6009/jjrt.2024-1342","DOIUrl":"10.6009/jjrt.2024-1342","url":null,"abstract":"Purpose: National diagnostic reference levels in Japan 2020 (DRLs 2020) have been published. In the field of angiography, in addition to the fluoroscopic dose rate, incident air kerma at the patient entrance reference point displayed on the equipment (Ka,r: mGy) and air kerma-area product displayed on the equipment (PKA: Gycm2) were set. A questionnaire survey was conducted at each facility in the Tokai region to confirm the status of medical radiation dose control in the region.Method: A questionnaire survey was conducted at each facility in the Tokai region. The items were fluoroscopic dose rate in each area (head and neck, cardiac, chest and abdomen, and limbs), DA and DSA dose rates, and dose area product meter (Ka,r, PKA) for the main procedures in each area.Result: The median values in this study were lower than those in the DRLs 2020, indicating that appropriate dose control is being implemented in the Tokai region. The trends of fluoroscopic and radiographic dose rates were different in each area, and there was some variation among the facilities.Conclusion: We believe that the incorporation of fluoroscopic and radiographic dose rates by area into the DRLs will facilitate more appropriate dose control at each facility in the future.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"66-76"},"PeriodicalIF":0.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134650651","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}

引用次数: 0

[Examination of Dosage Optimization Based on Body Weight Index in Resting Myocardial Blood Flow Scintigraphy Using ^99mTc]. [99mTc静息心肌血流显像中基于体重指数的剂量优化检查]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-01-20 Epub Date: 2023-11-07 DOI: 10.6009/jjrt.2024-1374

Shigehisa Tanaka, Mitsuya Abe, Yoshihiro Haga, Yuuji Kaga

{"title":"[Examination of Dosage Optimization Based on Body Weight Index in Resting Myocardial Blood Flow Scintigraphy Using 99mTc].","authors":"Shigehisa Tanaka, Mitsuya Abe, Yoshihiro Haga, Yuuji Kaga","doi":"10.6009/jjrt.2024-1374","DOIUrl":"10.6009/jjrt.2024-1374","url":null,"abstract":"Purpose: The purpose of this study was to optimize radiopharmaceutical dosage in single-photon emission computed tomography (SPECT) nuclear medicine. Therefore, we examined a variable dose (VD) method using body weight as an index in resting myocardial scintigraphy using a 99mTechnetium (99mTc) preparation.Methods: In this study, we compared the VD method with the fixed dose (FD) method without a variable by body weight. There were 50 patients using the VD method and 50 patients using the FD method. For the VD method, we set the target average count (counts/pixel) per SPECT view. Using the myocardial average count of the FD method, and the estimated intracorporeal radioactivity at the start of the examination, the dose of the VD method, which varies appropriately depending on the body weight, was calculated.Results: The VD method had less variation in myocardial counting and was closer to the target count than the FD method, and the median dosage decreased.Conclusion: The VD method suggested the possibility of obtaining a count independent of physique and stable image quality, reducing medical and occupational radiation exposure in resting myocardial blood flow scintigraphy.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"16-25"},"PeriodicalIF":0.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71523757","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}

引用次数: 0

[Evaluation of Changes in Membranous Septum Length during the Cardiac Cycle and by Measurement Methods Using the Preoperative CT for Transcatheter Aortic Valve Replacement: A Single-center Cross-sectional Study]. [评估心动周期中膜间隔长度的变化，并通过术前CT测量方法评估经导管主动脉瓣置换术：一项单中心横断面研究]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-01-20 Epub Date: 2023-11-02 DOI: 10.6009/jjrt.2024-1398

Kenta Hirai, Hiroki Shiga, Tomohisa Tada, Eiji Nakatani, Makoto Motooka, Koutaro Takahashi, Yasuyo Takeuchi, Motoki Nakamura, Hiroki Sakamoto

{"title":"[Evaluation of Changes in Membranous Septum Length during the Cardiac Cycle and by Measurement Methods Using the Preoperative CT for Transcatheter Aortic Valve Replacement: A Single-center Cross-sectional Study].","authors":"Kenta Hirai, Hiroki Shiga, Tomohisa Tada, Eiji Nakatani, Makoto Motooka, Koutaro Takahashi, Yasuyo Takeuchi, Motoki Nakamura, Hiroki Sakamoto","doi":"10.6009/jjrt.2024-1398","DOIUrl":"10.6009/jjrt.2024-1398","url":null,"abstract":"Purpose: The purpose of this study was to evaluate the changes in membranous septum (MS) length during the cardiac cycle and by measurement methods using the preoperative computed tomography (CT) images for transcatheter aortic valve replacement (TAVR).Method: Among 34 consecutive patients who underwent preoperative contrast-enhanced CT for TAVR, we measured MS lengths by three measurement methods (coronal, stretched, and reformatted coronal view method) at 10% intervals in the cardiac cycle.Result: MS lengths differed between the three measurement methods in all cardiac phases. Moderate correlations were observed between the MS lengths measured by the coronal view method and the other two methods. In contrast, strong correlations were observed between the MS lengths measured by the stretched view method and the reformatted coronal view method. The frequencies of the minimum and maximum MS lengths during the cardiac cycle tended to be highest at R-R 90% and R-R 30%, respectively. The median MS lengths at R-R 90% were smaller than those at R-R 30% in all measurement methods.Conclusion: The MS length in patients undergoing contrast-enhanced CT for TAVR varies notably depending on the cardiac cycle and measurement methods. When evaluating MS length, it is crucial to consider the measurement method and to perform measurements during diastole in order to evaluate the minimum value during the cardiac cycle.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"26-35"},"PeriodicalIF":0.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71429952","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}

引用次数: 0

[Evaluation of Refocus Flip Angle for Three-dimensional Proton Density-weighted Turbo Spin-echo Imaging in Cerebrovascular Black Blood MRA and Comparison with Three-dimensional Time-of-flight MRA]. [三维质子密度加权涡轮自旋回波成像在脑血管黑血MRA中的再聚焦翻转角度评价及与三维飞行时间MRA的比较]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-01-20 Epub Date: 2023-11-27 DOI: 10.6009/jjrt.2024-1333

Ryotaro Jingu, Satoshi Shimizu, Ryuji Nakamuta, Yuta Izuno, Yuko Saruwatari, Eiji Koda, Tadahisa Uemura, Koichi Takano, Kengo Yoshimitsu

{"title":"[Evaluation of Refocus Flip Angle for Three-dimensional Proton Density-weighted Turbo Spin-echo Imaging in Cerebrovascular Black Blood MRA and Comparison with Three-dimensional Time-of-flight MRA].","authors":"Ryotaro Jingu, Satoshi Shimizu, Ryuji Nakamuta, Yuta Izuno, Yuko Saruwatari, Eiji Koda, Tadahisa Uemura, Koichi Takano, Kengo Yoshimitsu","doi":"10.6009/jjrt.2024-1333","DOIUrl":"10.6009/jjrt.2024-1333","url":null,"abstract":"The three-dimensional time-of-flight (3D-TOF), which is currently the most common acquisition technique of intracranial magnetic resonance angiography (MRA), may result in poor branch visualization due to reduced blood flow velocity. Proton density-weighted volume isotropic turbo spin-echo acquisition (PDVISTA) is less susceptible to these factors and has been reported to be useful in assessing cerebral vasospasm after subarachnoid hemorrhage. In this study, we investigated the effect of refocus flip angle (RFA) for PDVISTA on the contrast between blood vessels and background brain tissue using flow velocity phantom and clinical images, assuming the usefulness of PDVISTA in daily clinical practice. The phantom experiments showed that the contrast ratio significantly improved with decreasing RFA; however, considering the signal-to-noise ratio, RFA 80° was determined as optimal for clinical use. Visual assessment was performed on PDVISTA (RFA 80°) and conventional 3D-TOF MRA clinical images, which suggested the superiority of PDVISTA over 3D-TOF in the delineation of peripheral branches of cerebral vessels. The results suggest that PDVISTA is useful not only for subarachnoid hemorrhage patients but also in daily clinical practice.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"56-65"},"PeriodicalIF":0.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138441794","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}

引用次数: 0

[Analysis of Preventive Cases Using Resilience Engineering in Radiotherapy Department]. 【放射治疗科应用弹性工程预防病例分析】。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-01-20 Epub Date: 2023-10-18 DOI: 10.6009/jjrt.2024-1370

Shintaro Tsuda, Daisuke Ando, Yamato Wakabayashi, Takeo Nakashima, Yusuke Ochi, Takuro Okumura, Hirokazu Masuda, Koji Naito, Kento Tsubouchi, Akiko Kimura, Yasushi Nagata

{"title":"[Analysis of Preventive Cases Using Resilience Engineering in Radiotherapy Department].","authors":"Shintaro Tsuda, Daisuke Ando, Yamato Wakabayashi, Takeo Nakashima, Yusuke Ochi, Takuro Okumura, Hirokazu Masuda, Koji Naito, Kento Tsubouchi, Akiko Kimura, Yasushi Nagata","doi":"10.6009/jjrt.2024-1370","DOIUrl":"10.6009/jjrt.2024-1370","url":null,"abstract":"Purpose: Resilience engineering is the ability of a system to adjust its own functions and maintain the required behavior in the face of changes and disturbances, and resilience potential is a necessary requirement. We aimed to clarify the relationship between resilience potential and error prevention cases.Method: Based on the error cases reported in our department, we aggregated the relationship with resilience potential for each radiation treatment process.Result: As a result of tabulating the relationship, we were able to recognize and prevent errors by taking preventive measures from past cases. On the other hand, in cases that slipped through the check mechanism, errors were discovered because of a sense of discomfort in unusual situations, and some error cases could be prevented by increasing the resilience potential.Conclusion: This study found that preparation, observation, coping, and utilization of past experiences are related to resilience potential in preventive cases.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"36-46"},"PeriodicalIF":0.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49685919","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}

引用次数: 0

[Image Quality Assessment Using Task-based Performance of a Model Observer: Detectability Index, d']. [利用模型观察者基于任务的表现进行图像质量评估：可探测性指数 d']。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-01-01 DOI: 10.6009/jjrt.2024-2387

Shigehiko Katsuragawa

引用次数: 0

[1. Nuclear Medicine Division, Image Sciences Division, Education Committee]. [核医学分部、图像科学分部、教育委员会]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-01-01 DOI: 10.6009/jjrt.2024-2408

引用次数: 0

[Cybersecurity for Medical Devices]. [医疗设备网络安全]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-01-01 DOI: 10.6009/jjrt.2024-2411

Hidetaka Matsuo

引用次数: 0

[1. Standards of Dosimetry and Commissioning in a Helical Radiotherapy Unit with a Ring-based Gantry]. [1.采用环形龙门的螺旋放射治疗装置的剂量测定和调试标准]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-01-01 DOI: 10.6009/jjrt.2024-2389

Hidetoshi Shimizu

引用次数: 0

[Yuimahru - All Japan Radiological Technology]. [Yuimahru - 全日本放射技术]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-01-01 DOI: 10.6009/jjrt.2024-2423

Junji Shiraishi

引用次数: 0