Results 71 to 80 of about 4,830 (200)

Lung V5 and Planning Target Volume/Lung Volume Ratio as Independent Risk Factors for ≥Grade 2 Radiation Pneumonitis after Moderately Hypofractionated Radiotherapy: A Retrospective Study

Asia-Pacific Journal of Clinical Oncology, EarlyView.
Lung V5 and the planning target volume/lung volume ratio were identified as independent dosimetric risk factors for clinically significant radiation pneumonitis following moderately hypofractionated radiotherapy for lung cancer. Maintaining V5 < 35% may help mitigate this risk in clinical practice.
YuanYou Yang, FengXia Luo, Chao Wang, Gang Ren   +3 more
wiley   +1 more source

Evaluation of HyperArc™ using film and portal dosimetry quality assurance

Physical and Engineering Sciences in Medicine, 2022
Abstract HyperArc™ is a stereotactic radiotherapy modality designed for targeting multiple brain metastases using a single isocenter with multiple non-coplanar arcs. The purpose of this study was to assess the efficacy of two patient specific quality assurance methods, film and the Varian Portal Dosimetry System with Varian’s HyperArc ...
Onno Kamst, Pushkar Desai
openaire   +2 more sources

Impact of dose rate on accuracy of intensity modulated radiation therapy plan delivery using the pretreatment portal dosimetry quality assurance and setting up the workflow at hospital levels

Journal of Medical Physics, 2015
The aim of this study was to examine the impact of dose rate on accuracy of intensity modulated radiation therapy (IMRT) plan delivery by comparing the gamma agreement between the calculated and measured portal doses by pretreatment quality assurance (QA)
Karunakaran Kaviarasu, N Arunai Nambi Raj, K Krishna Murthy, A Ananda Giri Babu, Bhaskar Laxman Durga Prasad   +4 more
doaj   +1 more source

Clinical Efficacy of an Electronic Portal Imaging Device versus a Physical Phantom Tool for Patient-Specific Quality Assurance

Life, 2022
Pre-treatment patient-specific quality assurance (QA) is critical to prevent radiation accidents. The electronic portal imaging device (EPID) is a dose measurement tool with good resolution and a low volume-averaging effect.
Seung-Hyeop Baek, Sang-Hyoun Choi, Moo-Jae Han, Gyu-Seok Cho, Wonil Jang, Jin-Sung Kim, Kum-Bae Kim   +6 more
doaj   +1 more source

Retrospective Analysis of Survival and Adverse Effects Associated With Stereotactic Body Radiation Therapy in 12 Dogs With Hepatocellular Carcinoma

Veterinary and Comparative Oncology, EarlyView.
ABSTRACT This retrospective analysis evaluated 12 dogs with hepatocellular carcinoma (HCC) who received stereotactic body radiation therapy (SBRT). Dogs received between 6 and 25 Grey (Gy) per fraction for 1–5 fractions for a total dose of 13–30 Gy. Eleven patients (92%) experienced acute adverse effects (AE), with the majority being VRTOG grade 2–3 ...
Victoria Lee Newberry, Mary‐Keara Boss, Del Leary, Tiffany W. Martin   +3 more
wiley   +1 more source

A Portal imager-based patient dosimetry system [PDF]

, 2013
A technique for the in vivo dose verification of intensity modulated radiation therapy (IMRT) has been developed. An electronic portal image, calibrated in terms of absolute dose, is acquired for each radiation field following transmission through the ...
Roberts, James M. D.
core  

Comparison of 2D time-integrated, 3D time-integrated and 2D time-resolved portal dosimetry in detecting patient dose errors in external beam radiotherapy [PDF]

, 2016
Tese de mestrado integrado em Engenharia Biomédica e Biofísica, apresentada à Universidade de Lisboa, através da Faculdade de Ciências, 2016Em radioterapia externa com feixes de fotões é essencial que a distribuição de dose planeada seja entregue ao ...
Brás, Mariana Gomes
core   +4 more sources

Synthetic CT‐enabled weekly adaptive radiotherapy for nasopharyngeal carcinoma: Optimizing plan adaptation triggers through volumetric–dosimetric monitoring

Journal of Applied Clinical Medical Physics, Volume 27, Issue 7, July 2026.
Abstract Background and purpose Anatomical changes during radiotherapy for nasopharyngeal carcinoma (NPC) frequently compromise target volume coverage while escalating dose delivery to organs at risk (OARs). In adaptive radiotherapy (ART), optimizing workflow efficiency to minimize clinical workload while maximizing patient benefit remains a ...
Zhenmei Cao, Chun Wu, Lixiang Han, Tingting Duan, Fengyu Zhang, Lansheng Zhang, Bin Wang, Weijie Lei, Xinye Ni   +8 more
wiley   +1 more source

The effect of respiratory motion on electronic portal imaging device dosimetry [PDF]

Journal of Applied Clinical Medical Physics, 2019
AbstractThere is an increasing need to develop methods for in vivo verification of the delivery of radiotherapy treatments. Electronic portal imaging devices (EPID's) have been demonstrated to be of use for this application. The basic principle is relatively straightforward, the EPID is used to measure a two‐dimensional (2D) planar exit or portal dose ...
Fielding, Andrew, Benitez Mendieta, Jessica, Maxwell, Sarah, Jones, Catherine   +3 more
openaire   +4 more sources

Same‐day Hyaluronic Acid rectal spacer for TRUS‐guided HDR Prostate Brachytherapy: Feasibility and dosimetric outcomes

Journal of Applied Clinical Medical Physics, Volume 27, Issue 7, July 2026.
Abstract Background Rectal spacers are widely used to reduce rectal dose in prostate radiotherapy. However, their use during transrectal ultrasound (TRUS)‐guided high‐dose‐rate (HDR) brachytherapy has been limited by degradation of ultrasound image quality when placed on the day of the procedure, often necessitating CT‐based planning or separate‐day ...
Sook Kien Ng, Damodar Pokhrel, Colin Huang, Francis Adumata Asamoah, Jordan Alexander Holmes, Arpan Prabhu, Omar Ishaq   +6 more
wiley   +1 more source