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

[Dr. Yoshitomo Sano]. [佐野吉友博士]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0503

Hiroshi Hirano

引用次数: 0

[7. Dose Assessment of External and Internal Exposure]. (7。外照射和内照射剂量评估]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-0506

Kosuke Matsubara, Kazuyoshi Minami

引用次数: 0

[Survey of Occupational Exposure and Analysis of Actual Exposure Status for FY2018-2022]. [2018-2022财年职业暴露调查及实际暴露状况分析]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2025-01-01 DOI: 10.6009/jjrt.25-1555

Ryutaro Wada

{"title":"[Survey of Occupational Exposure and Analysis of Actual Exposure Status for FY2018-2022].","authors":"Ryutaro Wada","doi":"10.6009/jjrt.25-1555","DOIUrl":"10.6009/jjrt.25-1555","url":null,"abstract":"Understanding the trends in occupational radiation exposure is important for raising awareness of radiation protection. However, there have been no reports on the trends in exposure since the fiscal year 2018. In this resource, occupational exposure in the medical/radiological and nuclear fields from 2018 to 2022 was investigated, and the annual trends were evaluated. The method used was to organize the average/group doses using comprehensive statistical data on individual doses. In addition, the \"dose lower limit index value\" was set to 0.1, 1, and 20 mSv/y, and each group was analyzed. As a result, the majority of doses were below the detection limit, and there was no annual change in this proportion. There was no significant annual change in the average dose. Many radiologic technologists and doctors were over 0.1 and 1 mSv/y, but this has been decreasing since 2018. More than half of the people were doctors at over 20 mSv/y. However, medical care may not be reflected in dose data. No nuclear power workers received more than 20 mSv/y, and there was almost no annual change in any group. By setting the \"dose lower limit index value\" and conducting analysis, the individual dose and its annual change can be evaluated for workers who have been actually exposed to radiation.","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":"144369635","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

[Effect of Training Data Differences on Accuracy in MR Image Generation Using Pix2pix]. [训练数据差异对使用 Pix2pix 生成磁共振图像准确性的影响]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-12-20 Epub Date: 2024-10-29 DOI: 10.6009/jjrt.2024-1487

Masaru Tsukano, Yasushi Yamamoto, Masato Shirai, Masahiro Takamura, Kazuaki Matsuo, Yoshinori Miyahara, Yasushi Kaji

{"title":"[Effect of Training Data Differences on Accuracy in MR Image Generation Using Pix2pix].","authors":"Masaru Tsukano, Yasushi Yamamoto, Masato Shirai, Masahiro Takamura, Kazuaki Matsuo, Yoshinori Miyahara, Yasushi Kaji","doi":"10.6009/jjrt.2024-1487","DOIUrl":"10.6009/jjrt.2024-1487","url":null,"abstract":"Purpose: Using a magnetic resonance (MR) image generation technique with deep learning, we elucidated whether changing the training data patterns affected image generation accuracy.Methods: The pix2pix training model generated T1-weighted images from T2-weighted images or FLAIR images. Head MR images obtained at our hospital were used in this study. We prepared 300 cases for each model and four training data patterns for each model (a: 150 cases for one MR system, b: 300 cases for one MR system, c: 150 cases and augmentation data for one MR system, and d: 300 cases for two MR systems). The extension data were images of 150 cases rotated in the XY plane. The similarity between the images generated by the training and evaluation data in each group was evaluated using the peak signal-to-noise ratio (PSNR) and structural similarity (SSIM).Results: For both MR systems, the PSNR and SSIM were higher for training dataset b than training dataset a. The PSNR and SSIM were lower for training dataset d.Conclusion: MR image generation accuracy varied among training data patterns.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"1277-1287"},"PeriodicalIF":0.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142549403","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

[Long-term Reproducibility Evaluation of Fluoroscopy Dose Rate in Angiography Equipment]. [血管造影设备透视剂量率的长期可重复性评估]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-12-20 Epub Date: 2024-11-01 DOI: 10.6009/jjrt.2024-1490

Kazuya Mori, Kouhei Makabe, Ryou Sekiguchi, Toru Negishi, Takuji Tsuchida

{"title":"[Long-term Reproducibility Evaluation of Fluoroscopy Dose Rate in Angiography Equipment].","authors":"Kazuya Mori, Kouhei Makabe, Ryou Sekiguchi, Toru Negishi, Takuji Tsuchida","doi":"10.6009/jjrt.2024-1490","DOIUrl":"10.6009/jjrt.2024-1490","url":null,"abstract":"Purpose: Diagnostic reference levels (DRLs) are defined as fluoroscopic dose rate measurements that are used for patient dose management in angiography. It is recommended that DRLs be measured at least once a year. This study aimed to evaluate the long-term fluctuations of fluoroscopic dose rate in an angiography system.Methods: An unconnected X-ray output analyzer was used to measure the fluoroscopic dose rate (air kerma rate) at the patient's entrance reference point for a specific angiography system. The target period was from 2015 to 2022, and four measurements per year were made. First, the fluoroscopic dose rate was measured, and the average value and standard deviation for the target period were calculated. Next, the uncertainty of the measured values and the coefficient of variation were calculated. Finally, we calculated the fluoroscopic dose rate measurement error.Results: The average±standard deviation of the fluoroscopic dose rate was 353.29±9.11 µGy/s. The maximum uncertainty and coefficient of variation for each year were 5.41 µGy/s and 0.03, respectively. The maximum measurement error was 4.67%, where the mean measured value was taken as the true value.Conclusion: The fluctuation in the measured value of the fluoroscopic dose rate by an angiography system for 8 years is within ±5%, indicating stable X-ray output.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"1296-1304"},"PeriodicalIF":0.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142576839","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

[The Influence of the Presence or Absence of a Patient Transfer Slide Board on Radiation and Image Quality When Using an Automatic Tube Current Modulation with Bed Height Compensation]. [使用带床高补偿的自动导管电流调节装置时，有无病人转移滑板对辐射和图像质量的影响]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-12-20 Epub Date: 2024-11-13 DOI: 10.6009/jjrt.2024-1430

Fumie Higuchi, Yuta Fujiwara, Yoshiki Kamihoriuchi, Yutako Ohyama, Tomoko Sasaki, Shinsaku Watanabe, Takanori Masuda

{"title":"[The Influence of the Presence or Absence of a Patient Transfer Slide Board on Radiation and Image Quality When Using an Automatic Tube Current Modulation with Bed Height Compensation].","authors":"Fumie Higuchi, Yuta Fujiwara, Yoshiki Kamihoriuchi, Yutako Ohyama, Tomoko Sasaki, Shinsaku Watanabe, Takanori Masuda","doi":"10.6009/jjrt.2024-1430","DOIUrl":"10.6009/jjrt.2024-1430","url":null,"abstract":"Purpose: The purpose of this study was to evaluate the effect of patient transfer slide boards with automatic couch height positioning compensation (AHC) on image quality and radiation dose during computed tomography (CT) examinations.Methods: The chest phantom for Kyoto Kagaku (Kyoto) Type PBU-SS 2 was performed helical scan using a Canon Medical Systems (Tochigi) 80-row CT Aquilion Prime SP/i Edition. Scan parameters were tube voltage: 120 kV, tube current: min 50 mA max 500 mA with AHC for noise index: 15, slice thickness: 5.0 mm, rotation time: 0.35 s/rotation, pitch factor: 0.813, reconstruction kernel: FC03. Filtered back projection was used for image reconstruction. We compared the image noise and volume computed tomography dose index (CTDIvol) displayed on the console with and without the patient transfer slide boards by using or not using the AHC.Results: When using the AHC, CTDIvol was increased (p<0.05), and image noise was decreased (p<0.05). Without the AHC, there was no significant difference in CTDIvol (p=0.11) and image noise (p=0.29).Conclusion: The slide board utilized in this experiment did not have a notable impact on either image quality or exposure dose. Nonetheless, the use of the slide board was found to result in excessive exposure during CT scans that employed AHC.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"1305-1310"},"PeriodicalIF":0.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142634068","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

[Root Cause Analysis for Incident Reporting Cases of Radiological Technologists Based on Years of Experience]. [基于工作年限的放射技术人员事故报告案例根本原因分析]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-12-20 Epub Date: 2024-11-01 DOI: 10.6009/jjrt.2024-1510

Ryu Mabuchi, Ryota Akiho, Hiroshi Nakai

{"title":"[Root Cause Analysis for Incident Reporting Cases of Radiological Technologists Based on Years of Experience].","authors":"Ryu Mabuchi, Ryota Akiho, Hiroshi Nakai","doi":"10.6009/jjrt.2024-1510","DOIUrl":"10.6009/jjrt.2024-1510","url":null,"abstract":"Purpose: Root Cause Analysis (RCA) of reported incident reports can lead to measures to prevent the recurrence of accidents. The purpose of this study is to clarify the relationship between the occurrence of cases, causal factors, contributing factors, and the experience years of the reporters classified into three groups: less than 2 years, 3 to less than 5 years, and more than 5 years, for incident reports subject to RCA.Methods: From April 2018 to March 2023, a chi-square test was conducted between each item extracted from 239 cases subject to RCA and the experience years of the reporters, with a significance level of less than 5% considered significant.Results: Regarding the occurrence cases, radiological technologists with longer experience had more misidentified a patient and fewer errors in imaging conditions and range, while radiological technologists with 3 to less than 5 years of experience had more errors in imaging conditions (p<0.001). In terms of occurrence factors, radiological technologists with 3 to less than 5 years of experience had more cases of insufficient confirmation (p<0.05). For contributing factors, there was no significant difference between the experience year groups (p=0.19), with \"Impatience\" being the most common factor.Conclusion: This survey suggested that in incident reports of radiological technologists, \"Impatience\" is a contributing factor that can occur regardless of years of experience.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"1288-1295"},"PeriodicalIF":0.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142576843","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

[Correlation between Evaluation Methods of Short-time Neuromelanin MRI and SBR by Dopamine Transporter Scintigraphy]. [短时神经黑素核磁共振成像评估方法与多巴胺转运体闪烁成像 SBR 评估方法之间的相关性]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-12-20 Epub Date: 2024-11-12 DOI: 10.6009/jjrt.2024-1391

Kenta Nimiya, Mitsunori Morimatsu, Akira Harada, Morihisa Okada, Isao Ariyoshi

{"title":"[Correlation between Evaluation Methods of Short-time Neuromelanin MRI and SBR by Dopamine Transporter Scintigraphy].","authors":"Kenta Nimiya, Mitsunori Morimatsu, Akira Harada, Morihisa Okada, Isao Ariyoshi","doi":"10.6009/jjrt.2024-1391","DOIUrl":"10.6009/jjrt.2024-1391","url":null,"abstract":"Purpose: To verify the usefulness of three evaluation methods of short-time neuromelanin MRI, correlations between each method and the specific binding ratio (SBR) of dopamine transporter scintigraphy were investigated.Methods: Short-time neuromelanin MRI was used to measure the contents of melanin-containing cells in the midbrain substantia nigra based on the following methods. Method 1 evaluates the volume of the high-signal area of the midbrain substantia nigra. Method 2 evaluates the signal intensity ratio of the three dense areas of the midbrain substantia nigra. Method 3 evaluates the scoring of the data of Method 2. The subjects were 54 patients aged 60 years or older who underwent head MRI and DAT scan at the Department of Radiology of our hospital.Results: Significant correlations were found between the data of SBR and each of the three evaluation methods.Conclusion: All of our three methods to evaluate short-time neuromelanin MRI were considered to be useful in estimating the content of melanin-containing cells in the midbrain substantia nigra, showing the most effectiveness in Method 1.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"1311-1321"},"PeriodicalIF":0.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142634052","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

[Research Report on the Consistency of Radiation Dose Structured Report (RDSR)]. [辐射剂量结构化报告（RDSR）一致性研究报告]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-12-20 Epub Date: 2024-11-14 DOI: 10.6009/jjrt.2024-1463

Yoshihiro Nakada, Hidetaka Hayashi, Yasuo Okuda, Masamichi Aita, Yasushi Katsunuma, Minoru Kawamata, Hideki Shibata, Tatsuya Tsuge, Kazuhisa Furuta, Tadashi Miyanishi, Kyohei Morimoto, Yusuke Yamashita

{"title":"[Research Report on the Consistency of Radiation Dose Structured Report (RDSR)].","authors":"Yoshihiro Nakada, Hidetaka Hayashi, Yasuo Okuda, Masamichi Aita, Yasushi Katsunuma, Minoru Kawamata, Hideki Shibata, Tatsuya Tsuge, Kazuhisa Furuta, Tadashi Miyanishi, Kyohei Morimoto, Yusuke Yamashita","doi":"10.6009/jjrt.2024-1463","DOIUrl":"10.6009/jjrt.2024-1463","url":null,"abstract":"In 2020, recording and management of exposure doses for computed tomography (CT) became mandatory. In terms of dose management, information regarding the imaged body part is particularly important information for proper tabulation. However, the actual body part to be imaged and the body part information obtained from the device may differ. In this study, we investigated the difference between the imaged area information obtained from a CT device and the dose index when the area is divided into actual areas to be examined using a facility's unique imaging protocol. We collected 734784 radiation dose structured reports (RDSR) examined from 2014 to 2021 on CT equipment at 8 facilities and analyzed each facility's volume CT dose index (CTDIvol) and dose length product (DLP). The median values were tabulated and compared. Pre- and post-classing the body part, for CTDIvol, increasing tendency was observed only in the head and abdomen. A similar trend was observed for DLP. Regarding dose management using RDSR as an information source, there were no major differences in dose information depending on the classification of the body part to be imaged. We hope that the accuracy of dose management will be improved by accurately classifying the body parts to be imaged.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"1322-1327"},"PeriodicalIF":0.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142634066","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 Different Acquisition Modes on Image Quality and Quantitative Accuracy for Bone SPECT Using Ordered Subset Conjugate-gradient Minimizer]. [不同采集模式对使用有序子集共轭梯度最小化器进行骨 SPECT 的图像质量和定量准确性的影响]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-11-20 Epub Date: 2024-10-17 DOI: 10.6009/jjrt.2024-1455

Yui Orisaka, Takayuki Shibutani, Takahiro Konishi, Anji Yokouchi, Katsutoshi Fujiwara, Hiroto Yoneyama

{"title":"[Impact of Different Acquisition Modes on Image Quality and Quantitative Accuracy for Bone SPECT Using Ordered Subset Conjugate-gradient Minimizer].","authors":"Yui Orisaka, Takayuki Shibutani, Takahiro Konishi, Anji Yokouchi, Katsutoshi Fujiwara, Hiroto Yoneyama","doi":"10.6009/jjrt.2024-1455","DOIUrl":"10.6009/jjrt.2024-1455","url":null,"abstract":"We evaluated the effect of different xSPECT Bone acquisition methods on image quality and quantitative accuracy. A mixed bone-equivalent solution set to 250 HU and 99mTc was filled with the SIM2 Bone phantom. The xSPECT Bone acquisitions were performed with the step and shoot (SS) mode and two continuous modes (continuousview, continuoustotal) of the times per view, and the total acquisition times were the same as the SS mode. The radioactive concentration ratio of normal bone and tumor was set to 1 : 6. The reconstructed images were evaluated using uniformity, contrast, spatial resolution, recovery coefficient (RC) of the tumor part, and detectability. The detectability score (DS), an overall evaluation of detectability, was calculated from the results of uniformity and contrast. Uniformity of SS, continuousview, and continuoustotal methods was 29.4%, 17.4%, and 11.1%, respectively. Spatial resolution, RC, and detectability were similar among the SS mode and two continuous modes; however, the continuous modes showed good uniformity and contrast compared with the SS mode. In addition, the detectability of the continuous mode was equal to or superior to that of the SS mode.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"1191-1197"},"PeriodicalIF":0.0,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142482525","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