Nihon Hoshasen Gijutsu Gakkai zasshi最新文献_第8页

[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

[9. Clinical Operation of 1.5 T MRI Linac "Elekta Unity"]. (9。1.5 T MRI直线机“Elekta Unity”的临床操作。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0601

Kiyokazu Sato

引用次数: 0

[Introduction of "JIRA Activity in 2025"]. 【“2025年JIRA活动介绍”】。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0608

Munehiro Takahashi, Susumu Tabata

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

[Dispatch Reports on All Japan Radiological Technology/the 52nd Autumn Scientific Congress of JSRT]. [全日本放射技术调度报告/ JSRT第52届秋季科学大会]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0305

Junya Kohigashi, Miyu Otsuka, Misato Iwasaki, Hironori Otsubo, Haruki Ibamoto, Kose Takimura, Ayuna Ichiishi, Michimasa Tachibana, Tomohiro Furuya, Momoko Murata, Tsudou Watanabe, Sakae Nagata, Akari Ooba, Taisei Komoda, Hyojin Lee

引用次数: 0

[1. Development and Clinical Application Prospects of Nuclear Medicine Therapy]. (1。核医学治疗的发展与临床应用前景[j]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0404

Ryuichi Nishii

引用次数: 0

[Determination and Evaluation of a Tolerance Limit for In Vivo Dosimetry Based on Dose Variations]. [基于剂量变化的体内剂量学耐受极限的确定和评价]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1501

Natsumi Abo, Fumiyasu Matsubayashi, Masahiro Kaneko, Yasushi Ito, Yasuo Yoshioka

{"title":"[Determination and Evaluation of a Tolerance Limit for In Vivo Dosimetry Based on Dose Variations].","authors":"Natsumi Abo, Fumiyasu Matsubayashi, Masahiro Kaneko, Yasushi Ito, Yasuo Yoshioka","doi":"10.6009/jjrt.25-1501","DOIUrl":"https://doi.org/10.6009/jjrt.25-1501","url":null,"abstract":"Purpose: We investigated the relationship between dose variation and gamma analysis pass rate in in vivo dosimetry (IVD) and verified the detectivity of errors by using the tolerance of the pass rate determined on a dose variation basis.Methods: We used a treatment planning system and water-equivalent phantoms to simulate discrepancies between treatment planning and actual irradiation. These discrepancies were created by either deforming structures outlined in the phantom's computed tomography (CT) images or by modifying the CT values within those structures. We performed gamma analysis to compare the intensity distributions of the planned data (including discrepancies) with the distributions acquired by irradiating real phantoms using an electronic portal imaging device (EPID). We investigated the relationship between the gamma analysis pass rate and dose variation with and without the discrepancies.Results: For gamma analysis pass rates below 70%, a dose variation of approximately 5% was estimated. The accuracy of using the pass rate to predict a dose variation of 5% was 86%. In validation of the prediction, when the gamma analysis pass rate was below 70%, differences were detected in clinical cases with an 82% accuracy.Conclusion: A method for determining the tolerance of gamma analysis pass rate based on dose variation in phantoms is useful.","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":"144059425","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

[Standing upon the Shoulders of Giants]. 站在巨人的肩膀上。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0400

Hidekazu Nambu

引用次数: 0

[Validation of Quantitative Evaluation Method Using a Cadmium Zinc Telluride Cardiac Camera in the Diagnosis of Cardiac Amyloidosis]. [应用碲化镉锌心脏照相机定量评价方法诊断心脏淀粉样变性的验证]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1546

Hoshio Uwabe, Nobuhiro Yada, Yuki Hino, Shoko Konishi, Hideaki Watanabe, Yoshinori Miyahara, Yasushi Kaji

{"title":"[Validation of Quantitative Evaluation Method Using a Cadmium Zinc Telluride Cardiac Camera in the Diagnosis of Cardiac Amyloidosis].","authors":"Hoshio Uwabe, Nobuhiro Yada, Yuki Hino, Shoko Konishi, Hideaki Watanabe, Yoshinori Miyahara, Yasushi Kaji","doi":"10.6009/jjrt.25-1546","DOIUrl":"https://doi.org/10.6009/jjrt.25-1546","url":null,"abstract":"Purpose: The purpose of this study was to verify the clinical applicability of PYP accumulation rates obtained with a cadmium zinc telluride (CZT) cardiac camera in the diagnosis of cardiac amyloidosis.Methods: We performed 99mTc-PYP/201Tl-Cl dual-isotope imaging in 84 patients with suspected cardiac amyloidosis using both a CZT cardiac camera and a conventional Anger camera. We obtained the PYP accumulation rate from CZT SPECT images and visual score and H/CL ratio from planar images. We evaluated PYP accumulation rates in 14 ATTR and 9 non-ATTR patients diagnosed by biopsy. We also evaluated the correlation between the PYP accumulation rate and both the visual assessment grade and H/CL ratio in 84 patients.Results: The PYP accumulation rate was 18.5±10.6% in the non-ATTR group and 72.4±28.7% in the ATTR group, which was significantly higher in the ATTR group (p<0.01). The correlation coefficient between the PYP accumulation rate and visual score was 0.77, and that of the H/CL ratio was 0.76, both showing strong positive correlations.Conclusion: The PYP accumulation rate obtained with a CZT cardiac camera showed significant differences between ATTR and non-ATTR groups and strong correlations with conventional assessment indices, suggesting its potential applicability in the diagnosis of cardiac amyloidosis.","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":"144082628","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