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

[Accuracy of Setup in Deep-inspiration Breath-hold Irradiation Following Left Mastectomy Using Surface Imaging Guidance]. [表面成像引导下左乳切除术后深度吸气屏气照射设置的准确性]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1538

Minori Tanoue, Norimasa Matsushita, Makoto Sasaki, Takahiro Fujimoto, Manabu Nakata, Yuka Ono, Michio Yoshimura, Takashi Mizowaki

引用次数: 0

[Research Trends Using Artificial Intelligence in the MRI from 1989 to 2023: Analysis Using Text Mining]. [1989年至2023年在MRI中使用人工智能的研究趋势：使用文本挖掘的分析]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1480

Yohei Kamikawa, Masataka Yamaguchi, Tomoaki Shiroo, Yasufumi Kondo, Yukito Yoshida

{"title":"[Research Trends Using Artificial Intelligence in the MRI from 1989 to 2023: Analysis Using Text Mining].","authors":"Yohei Kamikawa, Masataka Yamaguchi, Tomoaki Shiroo, Yasufumi Kondo, Yukito Yoshida","doi":"10.6009/jjrt.25-1480","DOIUrl":"https://doi.org/10.6009/jjrt.25-1480","url":null,"abstract":"Purpose: Although the research areas applying artificial intelligence in the field of magnetic resonance imaging (MRI) have been expanding rapidly in recent years, the means to comprehensively understand these research areas have been limited. The purpose of this study was to visualize the research areas related to artificial intelligence in the field of MRI, and to understand the trend of research.Methods: Using PubMed database, we extracted article titles applying artificial intelligence in the MRI field from January 1, 1989 to December 31, 2023, created an extracted word list, graphs showing the relative frequency of occurrences of words, and drew a co-occurrence network diagram to investigate the frequency of appearance of words and changes in frequency and characteristic words over time.Results: The number of extracted titles was 2870. The most frequently appearing word was \"deep learning\" (1170 times from 2019 to 2023). Furthermore, deep learning was the word with the strongest co-occurrence (Jaccard coefficient 0.48 from 2019 to 2023). Regarding words related to organs, there was an increasing trend in the appearance frequency of the brain, prostate, and breast.Conclusion: In recent years, the research area related to artificial intelligence in the field of MRI has become a thriving area involving deep learning. In addition, there were many studies in the diagnostic area throughout the period.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"81 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144556053","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

[Causes of Impatience in Radiological Technologists and Its Influence on Work]. 放射科医师急躁的原因及其对工作的影响

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1569

Ryu Mabuchi, Hiroshi Nakai

{"title":"[Causes of Impatience in Radiological Technologists and Its Influence on Work].","authors":"Ryu Mabuchi, Hiroshi Nakai","doi":"10.6009/jjrt.25-1569","DOIUrl":"https://doi.org/10.6009/jjrt.25-1569","url":null,"abstract":"Purpose: Impatience contributes to incidents among radiological technologists, regardless of their years of experience. The purpose of this study was to investigate the causes and effects of impatience in the work of radiological technologists.Methods: An exploratory factor analysis was conducted on 148 questionnaire responses using a 5-item scale. The study focused on 26 items related to factors contributing to impatience and 11 items related to its impact on work.Results: The analysis identified 3 factors contributing to impatience: \"awareness of doctors and nurses working together,\" \"awareness of patients,\" and \"awareness of time.\" Additionally, 2 effects of impatience on work were identified: \"lack of confirmation during examinations\" and \"lack of confirmation before and after examinations.\" Multiple regression analysis with the addition of years of experience showed that the lack of confirmation before and after the examination was influenced by shorter years of experience, as well as by a stronger awareness of doctors and nurses working together, and time. At the same time, the lack of confirmation during the examination was influenced by a stronger awareness of doctors and nurses working together.Conclusion: This study clarified the factors that cause impatience in the work of radiological technologists and its influence on their work.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"81 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144577193","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

[4. Moves towards Establishing a Domestic System for Targeted Radionuclide Therapy]. (4。建立国内放射性核素靶向治疗体系的进展[j]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0703

Tatsuya Higashi

引用次数: 0

[Temporal Changes in Volume CT Dose Index in Radiation Dose Management for X-ray CT Scanners]. [x线CT放射剂量管理中体积CT剂量指数的时间变化]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1551

Yuki Yamaguchi, Masaaki Fukunaga, Yuse Shono, Misaki Fujita, Maho Kato, Kota Inoki

{"title":"[Temporal Changes in Volume CT Dose Index in Radiation Dose Management for X-ray CT Scanners].","authors":"Yuki Yamaguchi, Masaaki Fukunaga, Yuse Shono, Misaki Fujita, Maho Kato, Kota Inoki","doi":"10.6009/jjrt.25-1551","DOIUrl":"https://doi.org/10.6009/jjrt.25-1551","url":null,"abstract":"Purpose: The purpose of this study was to understand the temporal changes in the volume CT dose index (CTDIvol) and Image noise.Methods: The following 3 types of X-ray CT scanners were used: Aquilion PRIME Beyond Edition (CANON MEDICAL SYSTEMS, Tochigi, Japan; referred to as System A), Aquilion PRIME SP (CANON MEDICAL SYSTEMS; referred to as System B), and SOMATOM Definition Flash (Siemens Healthineers, Erlangen, Germany; referred to as System C). The CTDIvol was measured by placing an ion chamber in an acrylic phantom. The image noise was calculated as the standard deviation (SD) measured at center locations on the reconstructed water phantom image. Temporal changes were evaluated using relative errors. Relative errors were calculated by dividing the difference between the measured value for each month and the reference value by the reference value. The reference value was defined as the displayed value for CTDIvol evaluation and the first measured value for SD evaluation. The study period was from June 2023 to May 2024, with measurements taken once a month for a total of 12 times.Results: The mean relative errors of CTDIvol were -0.071±0.017 for System A, 0.029±0.014 for System B, and -0.090±0.008 for System C. The mean relative errors of SD were 0.007±0.004 for System A, 0.002±0.004 for System B, and 0.023±0.013 for System C.Conclusion: The mean relative error of CTDIvol was less than 10% and that of SD was less than 3%. The results of this study suggest the need for radiation dose management by monitoring the temporal changes in CTDIvol.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"81 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144994713","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

[A Simple Method for Measuring the Anisotropic Two-dimensional Noise Power Spectrum in Helical CT Scan]. [一种测量螺旋CT扫描各向异性二维噪声功率谱的简单方法]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1528

Yuki Ohsugi, Akihiro Narita, Masaki Ohkubo, Kenichi Sakai, Yoshiyuki Noto

{"title":"[A Simple Method for Measuring the Anisotropic Two-dimensional Noise Power Spectrum in Helical CT Scan].","authors":"Yuki Ohsugi, Akihiro Narita, Masaki Ohkubo, Kenichi Sakai, Yoshiyuki Noto","doi":"10.6009/jjrt.25-1528","DOIUrl":"10.6009/jjrt.25-1528","url":null,"abstract":"Purpose: Recently, a new method has been devised to measure the anisotropic 2-dimensional noise power spectrum (2D-NPS) in computed tomography. The 2D-NPS varied with the X-ray tube angle θ in the helical scan; it was defined as 2D-NPSθ. However, the method requires many scans to obtain the 2D-NPSθ for each θ with less statistical variability and is laborious. In the present study, the 2D-NPSθ was assumed to be an identical anisotropic 2D-NPS that rotated around the origin of the spatial frequency domain in conjunction with the rotation of the X-ray tube. We defined the identical 2D-NPS as 2D-NPSrot and proposed its measurement method with fewer scans.Methods: The 2D-NPSθ (θ from 0° to 180° in an increment of 30°) were obtained from noise images acquired by a hundred scans of a water phantom. In the proposed method, the 2D-NPSθ were obtained from noise images by 2 scans, rotated backward around the origin by θ to generate the identical 2D-NPS, and averaged to generate the 2D-NPSrot.Results: The 2D-NPSrot, when it was rotated by θ, agreed well with the corresponding 2D-NPSθ. Absolute values of the mean and standard deviation of percentage errors of the 2D-NPSrot with the corresponding 2D-NPSθ at each θ were less than 0.70% and 6.12%, respectively.Conclusion: The proposed method was suggested to be valid for simple measurement of anisotropic 2D-NPS.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"81 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143495049","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

[Effect of Parameters Related to Sampling Time on Resolution Characteristics of Fast TSE Dixon Method]. [采样时间相关参数对快速TSE Dixon方法分辨率特性的影响]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1459

Heita Uno, Makoto Suzuki, Kazutaka Nashiki, Hidemichi Kawata

{"title":"[Effect of Parameters Related to Sampling Time on Resolution Characteristics of Fast TSE Dixon Method].","authors":"Heita Uno, Makoto Suzuki, Kazutaka Nashiki, Hidemichi Kawata","doi":"10.6009/jjrt.25-1459","DOIUrl":"https://doi.org/10.6009/jjrt.25-1459","url":null,"abstract":"Purpose: Fast turbo spin echo (TSE) Dixon method, which acquires both in-phase and opposed-phase in a single echo train, resulting in a 50% reduction in imaging times compared to the TSE Dixon method. However, it has been observed that the Fast TSE Dixon method exhibits degraded resolution characteristics when scanned under the same parameters as the TSE Dixon method. This study aimed to reveal suitable scan parameters for the Fast TSE Dixon method by examining its resolution characteristics when altering the parameter of the receiver bandwidth (BW) and asymmetric echoes related to sampling time.Methods: The BW was adjusted to 400, 600, 800, and 1000 Hz/pixel for the TSE Dixon and Fast TSE Dixon methods. In addition, the parameter of asymmetric echoes was changed to on (weak), and off of the Fast TSE Dixon method. The modulation transfer function (MTF) of each sequence was assessed using the edge spread function in the frequency encoding direction and phase encoding direction.Results: The findings indicated that the MTFs of the TSE Dixon method remained constant despite alterations in the sampling time. Conversely, the MTFs of the Fast TSE Dixon method showed that resolution characteristics improved by shortening sampling time when the BW was expanded, and the asymmetric echoes were changed to on.Conclusion: We revealed suitable scan parameters for the Fast TSE Dixon method have been found to improve resolution characteristics by shortening sampling time when the BW was expanded and the asymmetric echoes were changed to on.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"81 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144144749","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 the Position Matching Accuracy for Radiological Technologists and Radiation Oncologists in Image-guided Radiation Therapy]. 影像引导放射治疗中放射技师和放射肿瘤学家位置匹配精度的评价

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1585

Tatsuya Yoshida, Tomoki Hayakawa, Toshiyuki Kawadai, Takako Shibasaki, Kazuya Nagata, Tetsuya Aoki

{"title":"[Evaluation of the Position Matching Accuracy for Radiological Technologists and Radiation Oncologists in Image-guided Radiation Therapy].","authors":"Tatsuya Yoshida, Tomoki Hayakawa, Toshiyuki Kawadai, Takako Shibasaki, Kazuya Nagata, Tetsuya Aoki","doi":"10.6009/jjrt.25-1585","DOIUrl":"https://doi.org/10.6009/jjrt.25-1585","url":null,"abstract":"Purpose: The promotion of task-shifting and task-sharing to facilitate work style reform for physicians has enabled radiological technologists (RTs) to perform primary matching in image-guided radiotherapy. The purpose in this study is to evaluate the position matching accuracy of RTs and radiation oncologist (ROs).Methods: Position matching was performed by four RTs and two ROs (RO-A and B). To evaluate the accuracy of the observer's position matching, five cases each were identified for the head, neck, chest, and pelvic regions in two-dimension planar images (2D/2D), and for the prostate in three-dimensional (3D) images (CBCT). Manual position matching was performed using the offline matching of the position matching analysis software at a position moved by 3-7 mm in the XYZ directions from the treatment position at the time of treatment. Inter-observer position matching accuracy was evaluated by calculating the difference between the treatment position and the matching position, and by calculating a 3D vector from the above difference.Results: The differences between the irradiation position and the reference position were within ±1.0 mm for 2D/2D and within ±1.5 mm for CBCT for the four RTs, while the maximum differences for RO-A were 3.0 mm and 3.5 mm, respectively. For 3D vectors, in 2D/2D, the values for four RTs and RO-B were 0.1-0.6 mm, compared to RO-A was 1.2-1.7 mm, and in CBCT, the values for four RTs were 0.3-0.7 mm, compared to the two ROs' were 1.3 mm and 1.4 mm.Conclusion: The position matching accuracy of our RTs was not inferior to that of ROs, confirming that primary matching by RTs is clinically acceptable.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"81 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145034395","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

[Scattered X-ray Distribution in Portable Dynamic Chest Radiography]. [便携式动态胸片的散射x线分布]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1516

Kana Hatsumi, Kojiro Ono, Yuki Sato, Koshiro Takuma, Junichi Matsumoto, Takafumi Haraguchi, Nagaharu Takakura

{"title":"[Scattered X-ray Distribution in Portable Dynamic Chest Radiography].","authors":"Kana Hatsumi, Kojiro Ono, Yuki Sato, Koshiro Takuma, Junichi Matsumoto, Takafumi Haraguchi, Nagaharu Takakura","doi":"10.6009/jjrt.25-1516","DOIUrl":"https://doi.org/10.6009/jjrt.25-1516","url":null,"abstract":"Purpose: The purpose of this study is to clarify the amount and distribution of scattered radiation in portable dynamic chest radiography (DCR) compared to portable conventional chest radiography (CCR), and to consider appropriate operation methods.Methods: Using a portable X-ray unit, we evaluated the imaging time characteristics in DCR and obtained the scattered X-ray dose distributions of DCR and CCR. The scattered X-ray dose was measured 200 cm from the irradiation field center, varying DCR imaging time (5, 10, 15 s). Scattered X-ray dose distribution was measured at 48 points between 100-300 cm from the irradiation field center for CCR and DCR (10 s). DCR (15 s) values were calculated from DCR (10 s) measurements. DCR 15 s was calculated from the calculated values for each measured value of DCR 10 s. Measurements were taken at the level of the abdomen and the lens.Results: It was found that the amount of scattered X-ray was higher with DCR than with CCR, and that the amount of scattered X-ray increased with increasing imaging time. In addition, the distribution of scattered X-rays with DCR showed a tendency for the amount of scattered X-rays to decrease behind the mobile X-ray unit and at the foot of the bed.Conclusion: When taking portable DCR images, radiologists must understand its characteristics and the scattered X-ray dose distributions, and must be even more considerate of and manage the surrounding area based on the 3 fundamental principles of radiological protection.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"81 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144048226","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

[Report of the Workshop for 2024 and Future Plans of X-Ray Leakage Measurement Expert Qualification for X-Ray Examination Rooms]. 【2024年车间报告及x射线检查室x射线泄漏测量专家资格认定未来规划】。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0406

Daisuke Kotani

引用次数: 0