首页 > 最新文献

Radiological Physics and Technology最新文献

英文 中文
Dual-encoder 3D transformer-based U-Net with temporal attention for non-mass enhancement segmentation in breast dynamic contrast-enhanced MRI. 基于双编码器三维变压器的U-Net与时间关注在乳房动态对比增强MRI非肿块增强分割。
IF 1.5 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2026-03-01 Epub Date: 2026-01-08 DOI: 10.1007/s12194-025-01004-y
Tomoki Kosugi, Ryohei Nakayama, Koji Sakai, Mariko Goto
{"title":"Dual-encoder 3D transformer-based U-Net with temporal attention for non-mass enhancement segmentation in breast dynamic contrast-enhanced MRI.","authors":"Tomoki Kosugi, Ryohei Nakayama, Koji Sakai, Mariko Goto","doi":"10.1007/s12194-025-01004-y","DOIUrl":"10.1007/s12194-025-01004-y","url":null,"abstract":"","PeriodicalId":46252,"journal":{"name":"Radiological Physics and Technology","volume":" ","pages":"259-269"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12950051/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145935396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Implementation of deep learning with convolutional block attention module for detecting collimator rotation errors in stereotactic radiosurgery quality assurance. 基于卷积块注意力模块的深度学习在立体定向放射外科质量保证中准直器旋转误差检测中的实现。
IF 1.5 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2026-03-01 Epub Date: 2026-01-05 DOI: 10.1007/s12194-025-01002-0
Le Tien Dat, Pham Quang Trung
{"title":"Implementation of deep learning with convolutional block attention module for detecting collimator rotation errors in stereotactic radiosurgery quality assurance.","authors":"Le Tien Dat, Pham Quang Trung","doi":"10.1007/s12194-025-01002-0","DOIUrl":"10.1007/s12194-025-01002-0","url":null,"abstract":"","PeriodicalId":46252,"journal":{"name":"Radiological Physics and Technology","volume":" ","pages":"233-242"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145901040","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
Influence of standardized breath-holding instruction and practice on craniocaudal misregistration between the arterial and venous phases in preoperative abdominal contrast-enhanced computed tomography. 标准化屏气指导与练习对术前腹部增强计算机断层扫描中动脉与静脉相颅-掌侧错位的影响。
IF 1.5 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2026-03-01 Epub Date: 2026-01-22 DOI: 10.1007/s12194-026-01012-6
Ryota Yamanaka, Kazutoshi Tsunou, Shoya Ota
{"title":"Influence of standardized breath-holding instruction and practice on craniocaudal misregistration between the arterial and venous phases in preoperative abdominal contrast-enhanced computed tomography.","authors":"Ryota Yamanaka, Kazutoshi Tsunou, Shoya Ota","doi":"10.1007/s12194-026-01012-6","DOIUrl":"10.1007/s12194-026-01012-6","url":null,"abstract":"","PeriodicalId":46252,"journal":{"name":"Radiological Physics and Technology","volume":" ","pages":"409-420"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146020195","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
Regional mammography dosimetry in South India: establishing modality and thickness-specific diagnostic reference levels. 印度南部地区乳房x线摄影剂量测定:建立模式和厚度特异性诊断参考水平。
IF 1.5 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2026-03-01 Epub Date: 2026-01-28 DOI: 10.1007/s12194-026-01011-7
Adhimoolam Saravana Kumar, Sudhir Kumar, Renato Padovani, Thangavel Manojkumar, K N Govindarajan, Balvinder Kaur Sapra
{"title":"Regional mammography dosimetry in South India: establishing modality and thickness-specific diagnostic reference levels.","authors":"Adhimoolam Saravana Kumar, Sudhir Kumar, Renato Padovani, Thangavel Manojkumar, K N Govindarajan, Balvinder Kaur Sapra","doi":"10.1007/s12194-026-01011-7","DOIUrl":"10.1007/s12194-026-01011-7","url":null,"abstract":"","PeriodicalId":46252,"journal":{"name":"Radiological Physics and Technology","volume":" ","pages":"293-302"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146067695","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
Optimizing lens and organ dose evaluation in head CT examinations using monte carlo simulation: influence of gantry tilt and scan range. 蒙特卡罗模拟优化头部CT检查中晶状体和器官剂量评估:龙门倾斜和扫描范围的影响。
IF 1.5 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2026-03-01 Epub Date: 2025-12-15 DOI: 10.1007/s12194-025-00980-5
Yasushi Katsunuma, Kaoru Sato, Takayuki Hasegawa, Yusuke Koba
{"title":"Optimizing lens and organ dose evaluation in head CT examinations using monte carlo simulation: influence of gantry tilt and scan range.","authors":"Yasushi Katsunuma, Kaoru Sato, Takayuki Hasegawa, Yusuke Koba","doi":"10.1007/s12194-025-00980-5","DOIUrl":"10.1007/s12194-025-00980-5","url":null,"abstract":"","PeriodicalId":46252,"journal":{"name":"Radiological Physics and Technology","volume":" ","pages":"77-90"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12950018/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145757873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Megavoltage computed tomography image quality assessment in a modern tomotherapy system: a frequency-domain analysis. 现代断层治疗系统中巨电压计算机断层成像质量评估:频域分析。
IF 1.5 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2026-03-01 Epub Date: 2026-02-02 DOI: 10.1007/s12194-026-01020-6
Hiroshi Kunitomo, Masato Yamada, Yuta Eguchi, Yuto Kitagawa, Kazuya Ohashi, Takahiro Tsuchiya, Hiroshi Fukuma, Katsuhiro Ichikawa
{"title":"Megavoltage computed tomography image quality assessment in a modern tomotherapy system: a frequency-domain analysis.","authors":"Hiroshi Kunitomo, Masato Yamada, Yuta Eguchi, Yuto Kitagawa, Kazuya Ohashi, Takahiro Tsuchiya, Hiroshi Fukuma, Katsuhiro Ichikawa","doi":"10.1007/s12194-026-01020-6","DOIUrl":"10.1007/s12194-026-01020-6","url":null,"abstract":"","PeriodicalId":46252,"journal":{"name":"Radiological Physics and Technology","volume":" ","pages":"350-358"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146107875","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
Evaluating the utility of simulated respiratory-gated four-dimensional computed tomography in internal-target-volume-based treatment planning for irregular breathing patterns. 评估模拟呼吸门控四维计算机断层扫描在不规则呼吸模式内靶容积治疗计划中的效用。
IF 1.5 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2026-03-01 Epub Date: 2026-01-09 DOI: 10.1007/s12194-026-01005-5
Satoki Hinai, Keisuke Usui, Yusuke Obara, Toshiya Maebayashi, Satoshi Ookubo, Atsushi Ichikawa, Yoshihisa Sasaki, Hajime Sakamoto, Shinsuke Kyogoku, Hiroyuki Daida

In internal target volume (ITV)-based treatment planning, respiratory-gated four-dimensional computed tomography (4D-CT) is used to visualize the respiratory motions of lung tumors. However, in cases of irregular breathing, conventional 4D-CT cannot be synchronized with patient-specific respiratory waveforms, which poses challenges to obtaining images that accurately represent the ITV of the tumor. To address this challenge, we propose "simulated respiratory-gated 4D-CT" synchronized with the simulated waveform. This study aimed to assess the precision of ITV delineation using simulated respiratory-gated 4D-CT in patients with irregular breathing. A respiratory motion phantom was employed by inserting a simulated tumor and assessing the method under sinusoidal and irregular breathing conditions. Irregular respiratory waveforms of 20 patients were used to simulate irregular breathing. The phantom was imaged using conventional 4D-CT, slow-scan CT, and our method. For conventional 4D-CT and our method, the average and maximum intensity projections (MIP) were obtained via postprocessing. ITVs corresponding to each respiratory motion were manually contoured. Furthermore, the Dice similarity coefficient (DSC) was computed based on the ITV of conventional 4D-CT. No significant disparity was found between the ITVs obtained using our method and those obtained using conventional 4D-CT under sinusoidal motion. The DSC values of the ITVs derived from our method using MIP were the highest. In the assessment of the irregular respiratory waveforms, the ITVs obtained via MIP using our method closely approximated the ideal ITV in 20 patients. These findings demonstrate that our method can enhance the accuracy of ITV delineation in lung tumors during irregular breathing episodes.

在基于内靶体积(ITV)的治疗计划中,使用呼吸门控四维计算机断层扫描(4D-CT)来可视化肺肿瘤的呼吸运动。然而,在呼吸不规则的情况下,传统的4D-CT不能与患者特有的呼吸波形同步,这对获得准确代表肿瘤ITV的图像提出了挑战。为了解决这一挑战,我们提出了与模拟波形同步的“模拟呼吸门控4D-CT”。本研究旨在评估使用模拟呼吸门控4D-CT对不规则呼吸患者的ITV描绘的准确性。在正弦和不规则呼吸条件下,通过插入模拟肿瘤并评估呼吸运动假体的方法。采用20例患者的不规则呼吸波形模拟不规则呼吸。采用常规4D-CT、慢扫描CT和我们的方法对幻体进行成像。对于传统的4D-CT和我们的方法,通过后处理获得平均和最大强度投影(MIP)。每个呼吸运动对应的itv被手工勾画。在常规4D-CT图像的基础上,计算Dice相似系数(DSC)。在正弦运动下,我们的方法与传统的4D-CT所获得的ITVs没有明显的差异。用MIP方法得到的itv的DSC值最高。在不规则呼吸波形的评估中,我们的方法通过MIP获得的ITV与20例患者的理想ITV非常接近。这些结果表明,我们的方法可以提高不规则呼吸发作期间肺肿瘤ITV描绘的准确性。
{"title":"Evaluating the utility of simulated respiratory-gated four-dimensional computed tomography in internal-target-volume-based treatment planning for irregular breathing patterns.","authors":"Satoki Hinai, Keisuke Usui, Yusuke Obara, Toshiya Maebayashi, Satoshi Ookubo, Atsushi Ichikawa, Yoshihisa Sasaki, Hajime Sakamoto, Shinsuke Kyogoku, Hiroyuki Daida","doi":"10.1007/s12194-026-01005-5","DOIUrl":"10.1007/s12194-026-01005-5","url":null,"abstract":"<p><p>In internal target volume (ITV)-based treatment planning, respiratory-gated four-dimensional computed tomography (4D-CT) is used to visualize the respiratory motions of lung tumors. However, in cases of irregular breathing, conventional 4D-CT cannot be synchronized with patient-specific respiratory waveforms, which poses challenges to obtaining images that accurately represent the ITV of the tumor. To address this challenge, we propose \"simulated respiratory-gated 4D-CT\" synchronized with the simulated waveform. This study aimed to assess the precision of ITV delineation using simulated respiratory-gated 4D-CT in patients with irregular breathing. A respiratory motion phantom was employed by inserting a simulated tumor and assessing the method under sinusoidal and irregular breathing conditions. Irregular respiratory waveforms of 20 patients were used to simulate irregular breathing. The phantom was imaged using conventional 4D-CT, slow-scan CT, and our method. For conventional 4D-CT and our method, the average and maximum intensity projections (MIP) were obtained via postprocessing. ITVs corresponding to each respiratory motion were manually contoured. Furthermore, the Dice similarity coefficient (DSC) was computed based on the ITV of conventional 4D-CT. No significant disparity was found between the ITVs obtained using our method and those obtained using conventional 4D-CT under sinusoidal motion. The DSC values of the ITVs derived from our method using MIP were the highest. In the assessment of the irregular respiratory waveforms, the ITVs obtained via MIP using our method closely approximated the ideal ITV in 20 patients. These findings demonstrate that our method can enhance the accuracy of ITV delineation in lung tumors during irregular breathing episodes.</p>","PeriodicalId":46252,"journal":{"name":"Radiological Physics and Technology","volume":" ","pages":"270-283"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145935463","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 radioprotective side shield attached to radioprotective glasses for reducing eye lens dose of endoscopists during endoscopic retrograde cholangiopancreatography: a phantom study. 在内窥镜逆行胆管胰胆管造影术中,用于降低内镜医师眼镜片剂量的附于放射防护眼镜的放射防护侧罩的研制:一项幻影研究。
IF 1.5 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2026-03-01 Epub Date: 2025-11-03 DOI: 10.1007/s12194-025-00983-2
Kotaro Fukushima, Kazuhiro Yamaguchi, Kosuke Matsubara

The use of radioprotective glasses alone may not reduce radiation sufficiently to protect the eyes of endoscopists performing endoscopic retrograde cholangiopancreatography (ERCP). In this study, we aimed to develop a radioprotective side shield that could be attached to radioprotective glasses. Air kerma was measured at the lens surface of an endoscopist phantom using optically stimulated luminescence dosimeters in an arrangement that simulated ERCP. The protective effect of the radioprotective side shield was evaluated by changing three factors: the number of sheets to be layered from 1 to 5, the front-side length of the sheet from 6 to 10 cm, and the rear-side length of the sheet from 5 to 7 cm. By increasing the front length of the sheets to 8 cm, their rear length to 6 cm, and increasing the number of sheets to three with a lead equivalent of 0.14 ± 0.02 mmPb, the air kerma on the ocular surface could be reduced considerably; hence, these changes were implemented. This achieved a dose reduction of 48.2-87.3% compared with the use of radioprotective glasses alone, especially when the endoscopist phantom was rotated 60° and 75° from the direction directly opposite to that of the patient phantom. The results suggest that radioprotective side shields can reduce radiation exposure in the eyes of endoscopists by < 0.03 mGy in 10-min fluoroscopy under most conditions during ERCP.

仅使用防辐射眼镜可能不足以减少辐射,以保护内窥镜医师进行内窥镜逆行胰胆管造影(ERCP)的眼睛。在这项研究中,我们的目标是开发一种可以附着在辐射防护眼镜上的辐射防护侧罩。在模拟ERCP的排列中,使用光刺激发光剂量计在内窥镜师幻影的透镜表面测量空气kerma。通过改变三个因素来评估辐射防护侧屏蔽的防护效果:层数从1到5,前侧长度从6到10 cm,后侧长度从5到7 cm。将前片长度增加到8 cm,后片长度增加到6 cm,并将片数增加到3片,导联量相当于0.14±0.02 mmPb,可显著减少眼表面的气肿;因此,实现了这些更改。与单独使用放射防护眼镜相比,剂量减少了48.2-87.3%,特别是当内窥镜医生的假体从与患者假体正相反的方向旋转60°和75°时。结果表明,辐射防护侧罩可以减少内窥镜医师眼睛的辐射暴露
{"title":"Development of radioprotective side shield attached to radioprotective glasses for reducing eye lens dose of endoscopists during endoscopic retrograde cholangiopancreatography: a phantom study.","authors":"Kotaro Fukushima, Kazuhiro Yamaguchi, Kosuke Matsubara","doi":"10.1007/s12194-025-00983-2","DOIUrl":"10.1007/s12194-025-00983-2","url":null,"abstract":"<p><p>The use of radioprotective glasses alone may not reduce radiation sufficiently to protect the eyes of endoscopists performing endoscopic retrograde cholangiopancreatography (ERCP). In this study, we aimed to develop a radioprotective side shield that could be attached to radioprotective glasses. Air kerma was measured at the lens surface of an endoscopist phantom using optically stimulated luminescence dosimeters in an arrangement that simulated ERCP. The protective effect of the radioprotective side shield was evaluated by changing three factors: the number of sheets to be layered from 1 to 5, the front-side length of the sheet from 6 to 10 cm, and the rear-side length of the sheet from 5 to 7 cm. By increasing the front length of the sheets to 8 cm, their rear length to 6 cm, and increasing the number of sheets to three with a lead equivalent of 0.14 ± 0.02 mmPb, the air kerma on the ocular surface could be reduced considerably; hence, these changes were implemented. This achieved a dose reduction of 48.2-87.3% compared with the use of radioprotective glasses alone, especially when the endoscopist phantom was rotated 60° and 75° from the direction directly opposite to that of the patient phantom. The results suggest that radioprotective side shields can reduce radiation exposure in the eyes of endoscopists by < 0.03 mGy in 10-min fluoroscopy under most conditions during ERCP.</p>","PeriodicalId":46252,"journal":{"name":"Radiological Physics and Technology","volume":" ","pages":"101-113"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12950080/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145439472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Morphological approaches for optimizing lateral knee radiographs in normal knees and knees with osteoarthritis. 优化正常膝关节和骨关节炎膝关节侧位片的形态学方法。
IF 1.5 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2026-03-01 Epub Date: 2025-11-29 DOI: 10.1007/s12194-025-00990-3
Nobutada Suzuki, Hajime Ito, Eiichiro Okumura, Takayuki Sakai, Shigehiro Ochi, Noriyuki Yanagawa, Manato Horii, Takahisa Sasho

Accurate lateral knee radiographs are essential for assessing pathology and planning surgery. However, achieving adequate femoral condyle overlap is technically challenging because of individual variations in lower limb alignment. We analyzed the alignment-dependent bone morphology and proposed practical X-ray tube angles to optimize lateral imaging. Full-length lower limb radiographs of 212 normal and 191 knees with osteoarthritis (KOA) were examined. The lateral distal femoral angle (LDFA) and medial proximal tibial angle were measured to classify the alignment into varus, neutral, and valgus types. The LDFA increased with varus alignment in both the normal (89.1°, 88.0°, and 85.2°) and KOA knees (90.2°, 88.0°, and 85.0°). The joint line orientation consistently exhibited an apex-distal pattern. The distal femoral tangent angle (θ = 90° - LDFA) ranged from - 0.2° to 5.0°, providing reference targets for X-ray tube inclination. This alignment-based approach improved imaging reproducibility and diagnostic accuracy in both normal and KOA knees.

准确的膝关节侧位x线片对评估病理和计划手术至关重要。然而,由于下肢排列的个体差异,实现足够的股骨髁重叠在技术上具有挑战性。我们分析了对线依赖的骨形态,并提出了实用的x射线管角度来优化侧位成像。对212例正常膝关节和191例骨关节炎患者的下肢x线片进行了检查。测量股骨外侧远端角(LDFA)和胫骨内侧近端角,将其分为内翻型、中性型和外翻型。正常膝关节(89.1°、88.0°和85.2°)和KOA膝关节(90.2°、88.0°和85.0°)内翻对齐时,LDFA增加。关节线方向一致呈现尖-远模式。股骨远端切角(θ = 90°- LDFA)范围为- 0.2°~ 5.0°,为x射线管倾斜提供参考靶点。这种基于对准的方法提高了正常和KOA膝关节的成像再现性和诊断准确性。
{"title":"Morphological approaches for optimizing lateral knee radiographs in normal knees and knees with osteoarthritis.","authors":"Nobutada Suzuki, Hajime Ito, Eiichiro Okumura, Takayuki Sakai, Shigehiro Ochi, Noriyuki Yanagawa, Manato Horii, Takahisa Sasho","doi":"10.1007/s12194-025-00990-3","DOIUrl":"10.1007/s12194-025-00990-3","url":null,"abstract":"<p><p>Accurate lateral knee radiographs are essential for assessing pathology and planning surgery. However, achieving adequate femoral condyle overlap is technically challenging because of individual variations in lower limb alignment. We analyzed the alignment-dependent bone morphology and proposed practical X-ray tube angles to optimize lateral imaging. Full-length lower limb radiographs of 212 normal and 191 knees with osteoarthritis (KOA) were examined. The lateral distal femoral angle (LDFA) and medial proximal tibial angle were measured to classify the alignment into varus, neutral, and valgus types. The LDFA increased with varus alignment in both the normal (89.1°, 88.0°, and 85.2°) and KOA knees (90.2°, 88.0°, and 85.0°). The joint line orientation consistently exhibited an apex-distal pattern. The distal femoral tangent angle (θ = 90° - LDFA) ranged from - 0.2° to 5.0°, providing reference targets for X-ray tube inclination. This alignment-based approach improved imaging reproducibility and diagnostic accuracy in both normal and KOA knees.</p>","PeriodicalId":46252,"journal":{"name":"Radiological Physics and Technology","volume":" ","pages":"376-383"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145641169","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
Measurement of gamma-ray dose rate distribution at the Kindai university reactor using the thermoluminescent properties of BeO ceramic plates. 利用BeO陶瓷板的热释光特性测量近畿大学反应堆的伽马射线剂量率分布。
IF 1.5 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2026-03-01 Epub Date: 2025-10-30 DOI: 10.1007/s12194-025-00981-4
Leo Takahashi, Genichiro Wakabayashi, Kenichi Watanabe, Hiroki Tanaka, Takushi Takata, Akihiro Nohtomi, Kiyomitsu Shinsho

The gamma-ray dose rate distribution at the Kindai University Reactor (UTR-KINKI) was measured using the thermoluminescent (TL) properties of beryllium oxide (BeO) ceramic plates. The reactor, operating at an extremely low thermal power of 1 W, is widely used for nuclear research, including radiation biology and detector development. In neutron-gamma mixed fields, determining the gamma-ray dose rate accurately is technically challenging due to the neutron sensitivity of conventional dosimeters. In this study, low-Na BeO ceramic thermoluminescence dosimeters (TLDs) were employed to selectively measure gamma-ray dose rates in the irradiation hole of UTR-KINKI, without the need for neutron correction. A comparative assessment was conducted using Na-doped BeO powder TLDs, and thermal neutron flux measurements were performed using a Li-glass scintillator. The results demonstrated that the height-dependent trend of the gamma-ray dose rate distribution was consistent with previous measurements obtained via paired ionization chambers. However, the absolute values of the gamma-ray dose rates measured with the BeO ceramic TLDs were approximately 10-30% higher than those determined by the paired ionization chamber. This discrepancy is likely due to neutron sensitivity considerations in previous studies. The gamma-ray dose rate at the reactor center was evaluated as approximately 24 cGy h-1. This study highlights the applicability of BeO ceramic TLDs for gamma-ray dosimetry in mixed radiation fields, offering a neutron-insensitive alternative for precise dose measurements in reactor environments.

利用氧化铍(BeO)陶瓷板的热释光(TL)特性测量了近畿大学反应堆(UTR-KINKI)的伽马射线剂量率分布。该反应堆以1瓦的极低热功率运行,广泛用于核研究,包括辐射生物学和探测器开发。在中子-伽马混合场中,由于传统剂量计的中子敏感性,准确确定伽马射线剂量率在技术上具有挑战性。本研究采用低钠BeO陶瓷热释光剂量计(TLDs),在不需要中子校正的情况下,选择性测量了UTR-KINKI辐照孔中的伽马射线剂量率。采用掺钠BeO粉末tld进行了对比评价,并使用Li-glass闪烁体进行了热中子通量测量。结果表明,伽玛射线剂量率分布的高度依赖趋势与先前通过配对电离室获得的测量结果一致。然而,用BeO陶瓷tld测量的伽马射线剂量率的绝对值比用配对电离室测量的伽马射线剂量率的绝对值高约10-30%。这种差异可能是由于先前研究中对中子灵敏度的考虑。反应堆中心的伽马射线剂量率估计约为24 cGy h-1。这项研究强调了BeO陶瓷tld在混合辐射场中伽马射线剂量测定的适用性,为反应堆环境中的精确剂量测量提供了中子不敏感的替代方案。
{"title":"Measurement of gamma-ray dose rate distribution at the Kindai university reactor using the thermoluminescent properties of BeO ceramic plates.","authors":"Leo Takahashi, Genichiro Wakabayashi, Kenichi Watanabe, Hiroki Tanaka, Takushi Takata, Akihiro Nohtomi, Kiyomitsu Shinsho","doi":"10.1007/s12194-025-00981-4","DOIUrl":"10.1007/s12194-025-00981-4","url":null,"abstract":"<p><p>The gamma-ray dose rate distribution at the Kindai University Reactor (UTR-KINKI) was measured using the thermoluminescent (TL) properties of beryllium oxide (BeO) ceramic plates. The reactor, operating at an extremely low thermal power of 1 W, is widely used for nuclear research, including radiation biology and detector development. In neutron-gamma mixed fields, determining the gamma-ray dose rate accurately is technically challenging due to the neutron sensitivity of conventional dosimeters. In this study, low-Na BeO ceramic thermoluminescence dosimeters (TLDs) were employed to selectively measure gamma-ray dose rates in the irradiation hole of UTR-KINKI, without the need for neutron correction. A comparative assessment was conducted using Na-doped BeO powder TLDs, and thermal neutron flux measurements were performed using a Li-glass scintillator. The results demonstrated that the height-dependent trend of the gamma-ray dose rate distribution was consistent with previous measurements obtained via paired ionization chambers. However, the absolute values of the gamma-ray dose rates measured with the BeO ceramic TLDs were approximately 10-30% higher than those determined by the paired ionization chamber. This discrepancy is likely due to neutron sensitivity considerations in previous studies. The gamma-ray dose rate at the reactor center was evaluated as approximately 24 cGy h<sup>-1</sup>. This study highlights the applicability of BeO ceramic TLDs for gamma-ray dosimetry in mixed radiation fields, offering a neutron-insensitive alternative for precise dose measurements in reactor environments.</p>","PeriodicalId":46252,"journal":{"name":"Radiological Physics and Technology","volume":" ","pages":"91-100"},"PeriodicalIF":1.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12950036/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145410399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
Radiological Physics and Technology
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1