Nihon Hoshasen Gijutsu Gakkai zasshi最新文献_第6页

[Safety Management in Radiological Medical Equipment: Looking Back and Moving Forward]. [放射医疗设备安全管理：回顾与前进]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0606

引用次数: 0

[Reduction of Lens Absorbed Dose through Optimization of the X-ray Tube Position during Localizer Radiograph in Radiation Therapy Planning CT]. [通过优化x射线管在放疗计划CT定位时的位置来降低晶状体吸收剂量]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1565

Kenji Kanemoto, Minoru Nakao, Kiyoshi Yamada

{"title":"[Reduction of Lens Absorbed Dose through Optimization of the X-ray Tube Position during Localizer Radiograph in Radiation Therapy Planning CT].","authors":"Kenji Kanemoto, Minoru Nakao, Kiyoshi Yamada","doi":"10.6009/jjrt.25-1565","DOIUrl":"https://doi.org/10.6009/jjrt.25-1565","url":null,"abstract":"Purpose: The International Commission on Radiological Protection Publication 118 reduced the threshold dose for cataract formation to 0.5 Gy and requires dose optimization in computed tomography (CT) for radiation therapy planning. This study investigated the operational characteristics of the CT automatic exposure control (CT-AEC) system using a carbon fiber couch top and head immobilization devices, as well as the X-ray tube position during the localizer radiograph orientation (hereafter referred to as the localizer orientation). It also influenced the lens absorbed dose and reduced the lens absorbed dose through optimization of the localizer orientation.Methods: Measured the image noise and the lens absorbed dose based on the localizer orientation. The reference localizer orientation was set to the right-lateral to left-lateral (RL) orientation, and the image quality setting value (noise index: NI) of the CT-AEC was set to 6, which corresponds to the predefined threshold.Results: The average standard deviation in the anterior-posterior (AP) orientation was 4.1±0.1, which was larger than the 3.9±0.1 for the RL orientation (P<0.05). The absorbed dose to the lens absorbed dose was 68.5±1.7 mGy for the AP orientation and 73.3±2.3 mGy for the reference RL orientation, representing an 8% reduction (P<0.01).Conclusion: This study suggests that imaging in the AP orientation potentially reduces the lens absorbed dose.","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":"144509867","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. Chubu Branch, Kinki Branch, Chugoku-Shikoku Branch, Kyushu Branch]. (4。中部分行，近畿分行，中部四国分行，九州分行]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0104

Naoki Nagasawa, Shigeyoshi Saito, Rie Ishii, Yasumasa Saigo

引用次数: 0

[Thinking about 10 Years from Now]. [从现在开始考虑10年]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0204

Satoshi Yanagita

引用次数: 0

[Connecting to the Future of the Society]. [连接社会的未来]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0500

Kazuya Ohashi

引用次数: 0

[Participation/Dispatch Reports on ECR 2025]. [ECR 2025的参与/派遣报告]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0507

Nobuyuki Akiyama

引用次数: 0

[Evaluation of Low-contrast Detectability of Different Reconstruction Algorithms and Noise Reduction Intensities in the Upper Abdominal Pseudo-human Phantom]. [不同重建算法和降噪强度对上腹部伪人幻像低对比度可检测性的评价]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1507

Haruna Hatakeyama, Yoshitaka Ota, Akio Tamura

{"title":"[Evaluation of Low-contrast Detectability of Different Reconstruction Algorithms and Noise Reduction Intensities in the Upper Abdominal Pseudo-human Phantom].","authors":"Haruna Hatakeyama, Yoshitaka Ota, Akio Tamura","doi":"10.6009/jjrt.25-1507","DOIUrl":"https://doi.org/10.6009/jjrt.25-1507","url":null,"abstract":"Purpose: The effects of reconstruction algorithm and noise reduction intensity on low-contrast detectability in abdominal CT examinations were investigated.Methods: FBP, hybrid IR, and deep learning-based reconstruction methods (DLR for body, DLR for body sharp) were compared using an upper abdominal pseudo-human phantom. Imaging was performed under four radiation dose conditions, with three noise reduction intensities, and NPS and CNRLO were used as evaluation indices.Results: DLR for body sharp showed excellent low-contrast detection performance with strong noise reduction and achieved a higher CNRLO than the others. Hybrid IR and DLR for body showed equivalent performance regardless of noise reduction intensity, confirming the limitations of low-frequency noise suppression.Conclusion: It is important to select a reconstruction algorithm and noise reduction intensity according to the purpose of the examination, and DLR for body sharp is useful for improving image quality and reducing exposure at low doses.","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":"144303898","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

[For the Future of the JSRT]. [为了JSRT的未来]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0103

Takayuki Ishida

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

[Assessment of Radiation Dose Reduction for Medical Staff at the Patient's Head Side in Structural Heart Disease Intervention Using Protective Equipment]. [使用防护设备对结构性心脏病患者头侧医护人员降低辐射剂量的评估]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1505

Hirotoshi Murakami, Naoki Hosoda, Natsuki Oyama, Ryoya Hatsuoka, Itaru Sudo

{"title":"[Assessment of Radiation Dose Reduction for Medical Staff at the Patient's Head Side in Structural Heart Disease Intervention Using Protective Equipment].","authors":"Hirotoshi Murakami, Naoki Hosoda, Natsuki Oyama, Ryoya Hatsuoka, Itaru Sudo","doi":"10.6009/jjrt.25-1505","DOIUrl":"10.6009/jjrt.25-1505","url":null,"abstract":"In interventions for structural heart disease (SHD), an echocardiologist and an anesthesiologist are also present close to the side of the bed at the patient's head. The purpose of this study was to investigate the effectiveness of X-ray protective devices in reducing exposure to scatter radiation for medical staff at the side of the head end of the angiography system bed during interventions for structural heart disease. The ambient radiation dosage was measured, with and without X-ray protective equipment, to determine the rate of reduction of scatter radiation. The dosage tended to be higher at the working angle compared to the PA direction. When protective equipment was not used, the dosage tended to be higher at the side of the head end of the bed than at the operator's position. The dose was reduced by more than 90% compared to that without protective equipment by installing a protective device at the side of the head end of the bed. It is important to understand the spatial dose distribution at the working angle, and the installation of protective equipment at the side of the head end of the bed during SHD interventions can reduce the exposure of attending staff.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"81 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143383702","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