Nihon Hoshasen Gijutsu Gakkai zasshi最新文献_第4页

[Image Quality Assessment of Non-contrast Brain Computed Tomography Using High-pitch Double Spiral Scan: A Basic Evaluation Using Phantom]. [使用高音高双螺旋扫描的非对比脑计算机断层成像质量评估：基于Phantom的基本评估]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1499

Yuichiro Sato, Tomomi Ohmura, Shun Muramatsu, Yuki Shinohara, Fumiaki Sasaki, Kazunori Matsumoto, Kouya Nakaizumi, Mamoru Kato

{"title":"[Image Quality Assessment of Non-contrast Brain Computed Tomography Using High-pitch Double Spiral Scan: A Basic Evaluation Using Phantom].","authors":"Yuichiro Sato, Tomomi Ohmura, Shun Muramatsu, Yuki Shinohara, Fumiaki Sasaki, Kazunori Matsumoto, Kouya Nakaizumi, Mamoru Kato","doi":"10.6009/jjrt.25-1499","DOIUrl":"https://doi.org/10.6009/jjrt.25-1499","url":null,"abstract":"Purpose: Motion artifacts likely occur in patients with acute intracerebral hemorrhage (ICH). This study aimed to validate the image quality characteristics of non-contrast brain computed tomography (CT) with high-speed imaging technology, named Flash spiral (FS) (Siemens Healthineers, Erlangen, Germany). We verified the differences in CT values using a phantom that simulated hematoma.Methods: A dual-source CT scanner (SOMATOM Drive; Siemens Healthineers) was used to obtain reference and FS images of a Catphan700 phantom (The Phantom Laboratory, Greenwich, NY, USA). The CT values were measured in the hematoma-simulated acrylic module and urethane within the phantom. The noise power spectrum (NPS), task transfer function (TTF), and system performance function (SPF) between reference and FS images were obtained to compare image quality in each scan.Results: Compared with the phantom's reference and FS images, no significant differences were observed in the CT values between the samples simulating hematoma and their surrounding areas. The NPS showed lower values in the FS images than the reference images at spatial frequencies above approximately 0.4 cycles/mm, while the peak frequencies were nearly equivalent. The 10% TTF values were almost the same between both images. The SPF values were also equivalent between the two images at spatial frequencies above approximately 0.5 cycles/mm.Conclusion: In the phantom experiment, the 10% TTF values of the FS images were comparable to those of the reference images, indicating similar resolution in the high spatial frequency domain. FS is expected to expand the applicability for detecting cerebral hemorrhage in patients with significant body movement, where detection is challenging under standard conditions.","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":"144082625","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

[6. Commissioning and Dosimetry Standards for 0.35 Tesla MRI Linac]. (6。0.35特斯拉MRI直线加速器的调试和剂量学标准[j]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0200

Yu Kumazaki

引用次数: 0

[Dr. Taizo Sanada]. [医生Taizo Sanada]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0201

Yoshinori Tanabe

引用次数: 0

["Radiology for Everyone"-Join Us in Shaping the Future!-An Invitation to the 81st Annual Meeting of the Japanese Society of Radiological Technology (JSRT) in Yokohama]. “每个人的放射学”——与我们一起共创未来！-邀请参加在横滨举行的日本放射技术学会（JSRT）第81届年会上]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0300

Hideyuki Iwanaga

引用次数: 0

[Comparison of the Impact of Deep Learning Techniques on Low-noise Head CT Images]. [深度学习技术对低噪声头部CT图像影响的比较]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1537

Takuro Tahara, Seigo Yoshida

{"title":"[Comparison of the Impact of Deep Learning Techniques on Low-noise Head CT Images].","authors":"Takuro Tahara, Seigo Yoshida","doi":"10.6009/jjrt.25-1537","DOIUrl":"10.6009/jjrt.25-1537","url":null,"abstract":"Purpose: This study aims to compare the effects of two types of deep learning (DL) techniques on brain CT values, image noise content, and contrast-to-noise ratio (CNR) between white and gray matter in low-noise head CT images, along with adaptive iterative dose reduction 3D (AIDR 3D).Methods: Twenty-one normal patients with no abnormal findings who underwent head CT for identification of acute illness were included in the study. DL techniques used were Advanced intelligent Clear-IQ Engine (AiCE, Canon Medical systems, Tochigi, Japan) and PixelShine (FUJIFILM Medical, Tokyo, Japan). We performed CT value measurements of 26 cerebrum regions, image noise measurements, and CNR calculations. We also conducted a visual assessment of image noise and white matter-gray matter contrast on a 5-point scale.Results: Image noise significantly decreased with DL techniques. CT values changed significantly with AiCE. CNR for white matter-gray matter was the highest with PixelShine (P<0.01). The visual assessment of white matter-gray matter contrast was the highest for PixelShine and the lowest for AiCE (P<0.01).Conclusion: While DL techniques reduce image noise, there are differences in CT values and visual impression, especially white matter-gray matter contrast, so care should be taken when using it.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"81 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143775036","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

[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