Nihon Hoshasen Gijutsu Gakkai zasshi最新文献_第7页

[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

[Impact of Imaging and Reconstruction Parameters for Cone-beam Computed Tomography on Three-dimensional Star Shot Using an X-ray CT-based Gel Dosimeter]. [基于x射线ct凝胶剂量计的锥形束计算机断层成像和重建参数对三维星射的影响]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1465

Shinichi Takahashi, Hidenobu Tachibana, Riki Oshika, Rie Tachibana, Masashi Itou

{"title":"[Impact of Imaging and Reconstruction Parameters for Cone-beam Computed Tomography on Three-dimensional Star Shot Using an X-ray CT-based Gel Dosimeter].","authors":"Shinichi Takahashi, Hidenobu Tachibana, Riki Oshika, Rie Tachibana, Masashi Itou","doi":"10.6009/jjrt.25-1465","DOIUrl":"10.6009/jjrt.25-1465","url":null,"abstract":"Previous studies have not demonstrated the influence of various imaging acquisition and reconstruction conditions on three-dimensional star shot analysis using an X-ray-based gel dosimeter. Therefore, we investigated the effects of image acquisition and reconstruction conditions on the method in this study and evaluated the robustness of the method. Firstly, we set a reference condition (80 kVp, 1080 mAs, full fan, full trajectory, 1800 projection number, iterative reconstruction) and nine other comparison conditions (80-125 kVp, 540-2160 mAs, half or full fan, full or half trajectory, 420-5400 projection number and iterative reconstruction or filtered back projection). Cone-beam computed tomography scans were performed under each condition before and after irradiation of the single gel dosimeter, and the position of the radiation isocenter relative to the image isocenter, beam isocentricity, and contrast-to-noise ratio (CNR) was measured. The differences compared to the reference were as follows: for isocenter distance, 0.0±0.1 mm on the X-axis, 0.0±0.2 mm on the Y-axis, and 0.1±0.3 mm on the Z-axis. The beam isocentricity was 0.0±0.2 mm. The CNR ranged from a maximum of 5.8 to a minimum of 2.6 in median comparisons. In contrast, compared to the results under the reference condition, the results under other conditions matched within a range of ±0.25 mm. This investigation showed that analysis is feasible within an uncertainty of 0.25 mm under imaging conditions where CNR is 3 or higher.","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":"143383793","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

[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

[JRC2024 ITEM Tour Experience Reports]. [JRC2024项目旅游体验报告]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0306

引用次数: 0

[5. History of Radiation Effects Research]. (5。辐射效应研究的历史]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0202

Yoshiaki Hirofuji

引用次数: 0

[Paper Review: PET Detectors with Depth-of-interaction and Time-of-flight Capabilities]. [论文综述：PET探测器与相互作用深度和飞行时间能力]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0205

Hideo Murayama

引用次数: 0

[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