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

[1. Diagnostic Imaging of Ischemic Cerebrovascular DiseaseThe Role of Each Imaging Modality]. (1。缺血性脑血管病的影像学诊断[j]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0806

Yuki Shinohara

引用次数: 0

[Examination of the Accuracy of Virtual Non-contrast Images of Hepatic Lesions in Photon Counting Detector CT]. [光子计数检测器CT对肝脏病变虚拟非对比图像准确性的检验]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1598

Chinatsu Maruyama, Takashi Ohtani, Marina Higashi, Kouki Takahashi, Masato Shimada, Tetsuya Tsujikawa, Toshiki Tateishi

{"title":"[Examination of the Accuracy of Virtual Non-contrast Images of Hepatic Lesions in Photon Counting Detector CT].","authors":"Chinatsu Maruyama, Takashi Ohtani, Marina Higashi, Kouki Takahashi, Masato Shimada, Tetsuya Tsujikawa, Toshiki Tateishi","doi":"10.6009/jjrt.25-1598","DOIUrl":"https://doi.org/10.6009/jjrt.25-1598","url":null,"abstract":"Purpose: The purpose of this study was to compare true non-contrast (TNC) images and virtual non-contrast (VNC) images obtained using photon-counting detector computed tomography (PCD-CT) and to evaluate the accuracy of VNC images in the assessment of hepatic lesions.Methods: The study included 79 patients who underwent contrast-enhanced CT and were diagnosed with hepatic lesions. The hepatic lesions consisted of 19 cases of hepatocellular carcinoma, 22 cases of metastatic liver tumors, 20 cases of hemangiomas, and 18 cases of cysts. CT values and standard deviations of hepatic lesions and background liver parenchyma were measured on TNC images and on VNC images reconstructed from equilibrium-phase scans. Using the measured values, the contrast-to-noise ratio (CNR) of hepatic lesions was calculated, and CT values and CNRs of the lesions were compared between true TNC and VNC images.Results: The CT values of hepatic lesions on TNC and VNC images were 37.5±15.1 and 38.7±16.1 HU, respectively, while those of background liver parenchyma were 61.2±5.91 and 64.3±6.02 HU, respectively; all demonstrated good agreement. The correlation coefficients of CT values between TNC and VNC images were 0.898 for hepatic lesions and 0.933 for background liver parenchyma. Furthermore, when analyzed by lesion type, no significant differences were observed in CT values and CNRs (p>0.05).Conclusion: The accuracy of VNC images for liver lesions was very high, and for typical hepatic lesions in particular, the findings suggest that TNC images may be omitted.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":"81 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145208394","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

[3. MRI].

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1007

Kosuke Morita

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

[2. Radiopharmaceuticals for Targeted Radiotherapy]. (2。靶向放疗用放射性药物[m]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0501

Koki Hasegawa

引用次数: 0

[8. Commissioning of 1.5 T MR Linac "Elekta Unity"]. (8。1.5 T MR直线发电机“Elekta Unity”的调试。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0505

Masato Tsuneda

引用次数: 0

[Evaluation of the Accuracy of Patent Fixation System Using a Bi-directional X-ray Image Matching System during Spine Stereotactic Body Radiation Therapy]. [利用双向x线图像匹配系统评估脊柱立体定向放射治疗中专利固定系统的准确性]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1533

Kenji Matsumoto, Takahiro Sakamoto, Masakazu Otsuka, Hiroyuki Kosaka, Hidekazu Nambu

{"title":"[Evaluation of the Accuracy of Patent Fixation System Using a Bi-directional X-ray Image Matching System during Spine Stereotactic Body Radiation Therapy].","authors":"Kenji Matsumoto, Takahiro Sakamoto, Masakazu Otsuka, Hiroyuki Kosaka, Hidekazu Nambu","doi":"10.6009/jjrt.25-1533","DOIUrl":"https://doi.org/10.6009/jjrt.25-1533","url":null,"abstract":"Purpose: To evaluate the accuracy of fixation devices during irradiation of our thoracic and lumbar vertebral stereotactic body radiation therapy (SBRT) and to suggest appropriate planning target volume margins.Methods: Nine patients (45 sessions) with spinal metastases treated with spinal SBRT were studied. A fixation system with a torso shell was used as a fixture for thoracic and lumbar spinal lesions. In the patient setup, radiographic imaging was performed using Exactrac (Brainlab, Munich, Germany), followed by cone beam computed tomography (CBCT) confirmation to ensure that the images were matched within 0.3 mm just before irradiation. Irradiation was started after the collation, and additional X-ray imaging using Exactrac was performed immediately before, during, and immediately after treatment, respectively, to evaluate the fixation accuracy during irradiation.Results: The mean ±1 standard deviation for each direction for movement during irradiation with the body shell was as follows: Lateral direction: 0.01±0.21 mm, head-tail direction: -0.01±0.18 mm, anteroposterior direction: 0.06±0.16 mm, roll: 0.02±0.19°, pitch: -0.02±0.29°, yaw: -0.03±0.23°.Conclusion: The image guided radiotherapy system using X-ray imaging with Exactrac allowed the evaluation of positioning accuracy during irradiation. The body shell fixation system was able to ensure fixation accuracy within 1 mm during irradiation. In addition, the positioning during irradiation using Exactrac is very useful in the evaluation of positioning accuracy during irradiation in SBRT of the vertebral body, where very high irradiation accuracy is required.","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":"144201022","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