Nihon Hoshasen Gijutsu Gakkai zasshi最新文献_第5页

[Comments on "Evaluation on the Availability of the Electrometer Inspection by Users Using a Newly Developed Current Source" (2)]. [关于 "对用户使用新开发的电流源进行电度表检查的可用性评估 "的评论 (2)].

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-10-20 Epub Date: 2024-09-18 DOI: 10.6009/jjrt.2024-2419

Morihito Shimizu

引用次数: 0

[Response to Comments for Discussion of Evaluation on the Availability of the Electrometer Inspection by Users Using a Newly Developed Current Source]. [对用户使用新开发的电流源进行电度表检查可用性评估讨论意见的答复]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-10-20 Epub Date: 2024-09-18 DOI: 10.6009/jjrt.2024-2420

Hayato Tsuno, Fumiyasu Matsubayashi, Koji Sasaki, Takashi Sakai, Keiji Matsumoto, Kiyoshi Takeuchi

引用次数: 0

[Evaluation of Transmitted X-ray Spectrum, Lead Equivalent, and Uniformity of Radiation Protective Clothing Made of Lead-containing and Lead-free Materials]. [含铅和无铅材料制成的防辐射服的透射 X 射线光谱、铅当量和均匀性评估]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-09-20 Epub Date: 2024-08-15 DOI: 10.6009/jjrt.2024-1473

Yuji Yano, Toshioh Fujibuchi, Hiroyuki Arakawa

{"title":"[Evaluation of Transmitted X-ray Spectrum, Lead Equivalent, and Uniformity of Radiation Protective Clothing Made of Lead-containing and Lead-free Materials].","authors":"Yuji Yano, Toshioh Fujibuchi, Hiroyuki Arakawa","doi":"10.6009/jjrt.2024-1473","DOIUrl":"10.6009/jjrt.2024-1473","url":null,"abstract":"Purpose: The purpose of this study was to evaluate the protective performance of several new radiation-protective clothing and to clarify issues of quality control.Methods: The composition of the shielding elements was analyzed using X-ray fluorescence analysis, and the energy spectrum of transmitted X-rays was measured. Furthermore, the lead equivalent and uniformity were measured from the transmitted X-ray doses according to Japanese industrial standards (JIS). Uniformity was evaluated by transmitting X-ray images of each radiation protective clothing in addition to the conventional method.Results: The energy spectrum showed K-absorption edges of lead, bismuth, tin, etc., which were detected in the composition analysis. The multi-layered protective material maintained higher shielding ability at high tube voltages. In addition, X-ray images of the radiation-protective clothing showed uneven density and dots, and the differences in uniformity measurement methods and points that didn't meet the required shielding capacity were seen.Conclusion: The current JIS does not allow accurate evaluation of the lead equivalent and uniformity, so visual evaluation of X-ray images is important. It is necessary to establish standardized standards for quality control performed by each facility.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"944-954"},"PeriodicalIF":0.0,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141984134","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

[Radiation Dose Considerations for Breast Sonographers Following ^99mTc-HMDP Bone Scan Administration]. [乳腺超声技师在进行 99mTc-HMDP 骨扫描后的辐射剂量考虑因素]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-09-20 Epub Date: 2024-08-15 DOI: 10.6009/jjrt.2024-1434

Ryota Tsukada, Kei Wagatsuma, Hiroaki Suzuki

{"title":"[Radiation Dose Considerations for Breast Sonographers Following 99mTc-HMDP Bone Scan Administration].","authors":"Ryota Tsukada, Kei Wagatsuma, Hiroaki Suzuki","doi":"10.6009/jjrt.2024-1434","DOIUrl":"10.6009/jjrt.2024-1434","url":null,"abstract":"Purpose: Patients who were administered radiopharmaceuticals can be a source of radiation exposure to sonographers. This study aimed to identify factors associated with radiation exposure to breast sonographers from patients administered radiopharmaceuticals for bone scanning.Methods: The exposure dose of six sonographers was measured during breast sonography in 59 patients administered 99mTc-HMDP. We predicted the following factors to be related to exposure dose: time interval between administration and sonography, sonography examination time, estimated radioactivity at sonography, sonographer's years of experience, and patients' clinical data (age, renal function and surgical procedure). Spearman's rank correlation coefficient was used to examine the relationship between radiation dose and the aforementioned factors.Results: The mean±standard deviation of the exposure dose for the sonographers was 9.3±3.8 µSv. The time interval between administering the radiopharmaceutical agent and sonography, the sonography examination time and estimated radioactivity at sonography were found to be factors related to the exposure of the sonographer. The exposure dose increased as a function of the shorter time interval, longer examination time and higher estimated radioactivity at sonography.Conclusion: The time interval between drug administration and sonography, sonography examination time and estimated radioactivity at sonography contributed to the increased dose to breast sonographers. Although we considered that the exposure dose of sonographers would not possibly exceed the dose limit in the present study, we suggested that radiological technologists need to educate the physicians requesting sonography, and the sonographers about the radiation exposure in nuclear medicine.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"937-943"},"PeriodicalIF":0.0,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141984135","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

[Simple Method to Measure Slice Sensitivity Profile in Non-helical CT Using Tilted Metal Wire]. [使用倾斜金属线测量非螺旋 CT 切片灵敏度曲线的简单方法]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-09-20 Epub Date: 2024-08-15 DOI: 10.6009/jjrt.2024-1486

Akihiro Narita, Masaki Ohkubo, Yuki Ohsugi

{"title":"[Simple Method to Measure Slice Sensitivity Profile in Non-helical CT Using Tilted Metal Wire].","authors":"Akihiro Narita, Masaki Ohkubo, Yuki Ohsugi","doi":"10.6009/jjrt.2024-1486","DOIUrl":"10.6009/jjrt.2024-1486","url":null,"abstract":"Purpose: The measurement of slice sensitivity profile (SSP) in non-helical CT is conventionally performed by repeated scans with moving a micro-coin phantom little by little in the longitudinal direction at a small interval, which is reliable but laborious and time-consuming. The purpose of this study was to propose a simple method for measuring the SSP in non-helical CT based on a previous method that measured the slice thickness using a tilted metal wire.Methods: In the proposed method, a CT image was obtained by scanning a wire tilted at an angle θ=30° to the scan plane. By deconvolving the image with the point spread function (PSF) measured at the scanner, we obtained an image that was not affected by the PSF blurring. The CT value profile along the wire was acquired on the obtained image. The SSP was determined by multiplying the profile by tan θ. In addition, the SSP was measured by the conventional method using a micro-coin phantom and compared with the SSP obtained by the proposed method.Results: The SSP measured by the proposed method agreed well with that measured by the conventional method. The full-width at half-maximum values of these SSPs were the same.Conclusion: The proposed method was demonstrated to easily and accurately measure the SSP in non-helical CT.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"923-927"},"PeriodicalIF":0.0,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141984136","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

[Development of Dose Calculation Application for Computed Tomography Dose Management When Facility Protocols Differ from Diagnostic Reference Level (DRL)]. [当设备协议与诊断参考水平（DRL）不同时，为计算机断层扫描剂量管理开发剂量计算应用程序]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-09-20 Epub Date: 2024-08-14 DOI: 10.6009/jjrt.2024-1462

Yuki Kawamata, Ryuji Ikeda, Syuichi Tochihara, Masahiro Hashida, Masahiro Hatemura

{"title":"[Development of Dose Calculation Application for Computed Tomography Dose Management When Facility Protocols Differ from Diagnostic Reference Level (DRL)].","authors":"Yuki Kawamata, Ryuji Ikeda, Syuichi Tochihara, Masahiro Hashida, Masahiro Hatemura","doi":"10.6009/jjrt.2024-1462","DOIUrl":"10.6009/jjrt.2024-1462","url":null,"abstract":"Purpose: In this study, we aimed to develop an application that computes dose values resembling diagnostic reference level (DRL) conditions when disparity prevents direct dose comparisons between the national diagnostic reference levels in Japan 2020 (Japan DRLs_2020) and facility-specific computed tomography (CT) protocols.Methods: We developed an application using the R programming language and RStudio software that computes dose values and median values based on Japan DRLs_2020 imaging conditions following extraction of necessary information for dose calculations from the Radiation Dose Structured Report (RDSR) and Digital Imaging and Communications in Medicine (DICOM) tags. To ensure a user-friendly experience, we used the Shiny package to develop a graphical user interface that enables the application to operate seamlessly in web browsers.Results: The developed application successfully facilitated the calculation of dose and median values that aligned with the Japan DRLs_2020 for protocols whose imaging range and acquisition timing differed from those of the Japan DRLs_2020.Conclusion: By calculating dose values that align with DRL conditions, our application contributes to the implementation and optimization of dose management in CT for facilities that use diverse imaging protocols.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"928-936"},"PeriodicalIF":0.0,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141984133","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

[Development of a Head Radiography Simulator System Using Pose Estimation Techniques]. [利用姿势估计技术开发头部放射摄影模拟系统]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-08-20 Epub Date: 2024-07-11 DOI: 10.6009/jjrt.2024-1477

Michihiro Eto, Yasushi Ono, Tomofumi Nakawatari, Daisuke Hanamiya, Yuji Hatanaka

{"title":"[Development of a Head Radiography Simulator System Using Pose Estimation Techniques].","authors":"Michihiro Eto, Yasushi Ono, Tomofumi Nakawatari, Daisuke Hanamiya, Yuji Hatanaka","doi":"10.6009/jjrt.2024-1477","DOIUrl":"10.6009/jjrt.2024-1477","url":null,"abstract":"Purpose: This study proposes a system that can simulate head radiography by combining a technique for estimating human posture from moving images (hereafter referred to as \"pose estimation technique\") and use of two cameras capable of acquiring RGB images to determine body position during positioning.Methods: The angles of the median sagittal plane (MS), axial plane (AX), and orbitomeatal baseline (OM) were obtained using the pose estimation technique from frontal and lateral images captured after positioning. The resulting radiographs were displayed according to the results.Results: The head tilt during positioning could be determined based on the coordinate data of feature points acquired using the pose estimation technique. In an imaging experiment using a simulated human patient, errors increased as head tilt increased; however, the mean error values in each axis were 0.9° for MS, 0.8° for AX, and 1.5°for OM, when the patient was correctly positioned.Conclusion: The pose estimation technique can assist in evaluating positioning accuracy in radiography and is expected to be used as a potential simulator system.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"837-849"},"PeriodicalIF":0.0,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141581770","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

[Artifact Assessment in the Skull Base Region of Head CT Images with Various Tilt Angles Relative to the Orbitomeatal Line]. [不同倾斜角度的头部 CT 图像颅底区域的伪影评估]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-08-20 Epub Date: 2024-07-18 DOI: 10.6009/jjrt.2024-1441

Norisato Tsuda

引用次数: 0

[Basic MRI Study in the Imaging Direction of a Diffusion-weighted Whole Body Imaging with Background Body Signal Suppression]. [带背景体信号抑制的弥散加权全身成像方向的基础磁共振成像研究]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-07-20 Epub Date: 2024-06-12 DOI: 10.6009/jjrt.2024-1449

Shota Katsumata, Toshiyuki Takahashi, Shuko Nishimura, Tetsuichi Hondera, Mitsuyoshi Yasuda, Kyoichi Kato

{"title":"[Basic MRI Study in the Imaging Direction of a Diffusion-weighted Whole Body Imaging with Background Body Signal Suppression].","authors":"Shota Katsumata, Toshiyuki Takahashi, Shuko Nishimura, Tetsuichi Hondera, Mitsuyoshi Yasuda, Kyoichi Kato","doi":"10.6009/jjrt.2024-1449","DOIUrl":"10.6009/jjrt.2024-1449","url":null,"abstract":"A diffusion-weighted whole body imaging with background body signal suppression (DWIBS) is usually imaged as a whole body with Transverse (Tra). However, Tra has a large number of stations and a larger number than Coronal (Cor), so the scan time is longer. There are also drawbacks, such as signal unevenness between series. It is known that the effect of distortion is large in Cor. There is no report on it in Sagittal (Sag). Therefore, in this study, we focused on Sag and examined the imaging time, image distortion, fat suppression effect, and continuity between stations. In the examination by the phantom, the scan time was the shortest for Cor and the longest for Sag. In the strain evaluation, the effect of strain could be suppressed compared to Cor by using a rectangle field of view (FOV) in the anterior to posterior (AP) direction in Tra and Sag. There was no difference in the fat suppression effect depending on the imaging direction. Similar results were obtained in a study of 10 healthy volunteers, with Sag having the best continuity between stations.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"741-749"},"PeriodicalIF":0.0,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141312455","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

[Comparison of Bladder Volume Measurement Accuracy between Portable Ultrasound Diagnostic Equipment and CBCT for Pelvic Prostate Radiotherapy]. [便携式超声诊断设备与 CBCT 在盆腔前列腺放射治疗中的膀胱容积测量精度比较]。

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-07-20 Epub Date: 2024-06-26 DOI: 10.6009/jjrt.2024-1461

Takahiro Saika, Kenji Matsumoto

{"title":"[Comparison of Bladder Volume Measurement Accuracy between Portable Ultrasound Diagnostic Equipment and CBCT for Pelvic Prostate Radiotherapy].","authors":"Takahiro Saika, Kenji Matsumoto","doi":"10.6009/jjrt.2024-1461","DOIUrl":"10.6009/jjrt.2024-1461","url":null,"abstract":"Purpose: We evaluated the measurement accuracy of the CubeScan BioCon-900 (here after BioCon-900), a portable ultrasound imaging diagnostic device capable of measuring bladder volume, to determine if it can accurately assess bladder volume before intensity-modulated radiation therapy (IMRT) for prostate cancer.Methods: Bladder volume was measured from kV-Cone Beam computed tomography (CBCT) images obtained immediately before the administration of IMRT for prostate cancer using Halcyon. The bladder volume measured from kV-CBCT images (23 patients, total number of scans: 139) immediately before the IMRT procedure was used as the reference value. The difference between the bladder volume measured by the BioCon-900 was then calculated.Results: The bladder volume measured from kV-CBCT images was 117.5±49.4 cc. In contrast, the bladder volume obtained with BioCon-900 was 104.1±48.6 ml, resulting in an absolute mean difference of 18.4% and a correlation coefficient of 0.881. The measurements by BioCon-900 tended to be, on average, 11% smaller than the bladder volume measured by kV-CBCT imaging.Conclusion: kV-CBCT images demonstrated a strong positive correlation between bladder volume and bladder urine output obtained with BioCon-900. BioCon-900 can be used before kV-CBCT imaging to accurately and conveniently assess bladder volume.","PeriodicalId":74309,"journal":{"name":"Nihon Hoshasen Gijutsu Gakkai zasshi","volume":" ","pages":"760-765"},"PeriodicalIF":0.0,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141461108","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