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Augmented-reality enhanced ultrasound guidance: a sterile, hands-free approach using commercial augmented reality headsets. 增强现实增强超声引导:使用商用增强现实耳机的无菌、免提方法。
IF 1.5 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2026-03-04 DOI: 10.1007/s12194-026-01035-z
Thomas Saliba, David Rotzinger, Giuseppe Gullo
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引用次数: 0
Evaluation of a Monte Carlo-based independent dose calculation system for brain stereotactic radiotherapy using a robotic radiosurgery system. 基于蒙特卡罗的脑立体定向放疗独立剂量计算系统的评估。
IF 1.5 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2026-03-01 Epub Date: 2025-10-16 DOI: 10.1007/s12194-025-00976-1
Kaito Sakai, Yujiro Nakajima, Yuhi Suda, Fumiya Tsurumaki, Kohki Yasui, Yu Arai, Takuto Takizawa, Satoshi Kito, Keiko Nemoto Murofushi, Yukio Fujita, Naoki Tohyama

This study evaluated the dose calculation accuracy of a Monte Carlo (MC)-based independent dose calculation system (IDCS) for CyberKnife brain stereotactic treatment plans and compared it with ray-tracing (RT) and MC algorithms within the MultiPlan treatment planning system (TPS). Beam modeling accuracy was validated for 11 circular fields using measured output factors (OPF), percentage depth dose (PDD), and off-center ratio (OCR). A total of 200 retrospective brain stereotactic treatment plans were analyzed (50 prescribed 23 Gy in 1 fraction, 50 prescribed 35 Gy in 3 fractions, and 100 prescribed 41.5 Gy in 5 fractions). Among these, 24 quality assurance (QA) plans were evaluated using homogeneous cylindrical phantoms and ionization chambers. Dose-volume histogram (DVH) was calculated, and gamma analysis (3%/1 mm, 10% threshold) was performed. IDCS aligned with measured data, with OPF and PDD/OCR errors within 3% and 4%, respectively, except for small-field underestimations in the build-up region. For QA plans, TPS overestimated the measured dose (RT: 0.5% ± 2.6%, p = 0.58, MC: 1.7% ± 3.1%, p = 0.07), while IDCS underestimated it (- 1.3% ± 2.3%, p = 0.07). Gamma passing rates were 98.9% ± 1.5% (TPS-RT vs. IDCS) and 99.9% ± 0.3% (TPS-MC vs. IDCS). DVH metrics (planning target volume [PTV]: D98%, D95%, and D2%) showed clinically acceptable differences. IDCS showed greater dose calculation accuracy than the TPS-RT algorithm and could identify dose discrepancies in specific cases, thereby confirming its reliability for CyberKnife QA.

本研究评估了基于蒙特卡罗(MC)的独立剂量计算系统(IDCS)用于射波刀脑立体定向治疗方案的剂量计算精度,并将其与MultiPlan治疗计划系统(TPS)中的射线追踪(RT)和MC算法进行了比较。使用测量输出因子(OPF)、百分比深度剂量(PDD)和离中心比(OCR)验证了11个圆形场的光束建模精度。回顾性分析200例脑立体定向治疗方案(50例为23 Gy,分1组;50例为35 Gy,分3组;100例为41.5 Gy,分5组)。其中,24个质量保证(QA)计划被评估使用均匀圆柱形的幻影和电离室。计算剂量-体积直方图(DVH),并进行γ分析(3%/1 mm, 10%阈值)。IDCS与实测数据一致,OPF和PDD/OCR误差分别在3%和4%以内,除了积累区域的小油田低估。对于QA计划,TPS高估了测量剂量(RT: 0.5%±2.6%,p = 0.58, MC: 1.7%±3.1%,p = 0.07),而IDCS低估了测量剂量(- 1.3%±2.3%,p = 0.07)。Gamma通过率分别为98.9%±1.5% (TPS-RT vs. IDCS)和99.9%±0.3% (TPS-MC vs. IDCS)。DVH指标(计划目标容积[PTV]: D98%, D95%和D2%)显示临床可接受的差异。IDCS比TPS-RT算法的剂量计算精度更高,可以识别特定病例的剂量差异,从而证实了其在射波刀QA中的可靠性。
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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
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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
Monte Carlo-based dosimetric comparison of indigenous and commercial 106Ru/106Rh eye plaques using a mathematical eye phantom. 基于蒙特卡罗的剂量学比较本土和商业106Ru/106Rh眼斑使用数学眼幻影。
IF 1.5 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2026-03-01 Epub Date: 2025-11-18 DOI: 10.1007/s12194-025-00986-z
Vandana Shrivastava, Arghya Chattaraj, T Palani Selvam, M S Pathan, Rajesh Kumar, B K Sapra
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引用次数: 0
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
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
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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
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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。
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引用次数: 0
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Radiological Physics and Technology
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