Results 11 to 20 of about 4,830 (200)

Portal dosimetry in wedged beams. [PDF]

J Appl Clin Med Phys, 2015
Portal dosimetry using electronic portal imaging devices (EPIDs) is often applied to verify high‐energy photon beam treatments. Due to the change in photon energy spectrum, the resulting dose values are, however, not very accurate in the case of wedged beams if the pixel‐to‐dose conversion for the situation without wedge is used.
Spreeuw H, Rozendaal R, Camargo P, Mans A, Wendling M, Olaciregui-Ruiz I, Sonke JJ, Van Herk M, Mijnheer B.   +8 more
europepmc   +13 more sources

Feasibility of portal dosimetry for flattening filter‐free radiotherapy [PDF]

Journal of Applied Clinical Medical Physics, 2016
The feasibility of using portal dosimetry (PD) to verify 6 MV flattening filter‐free (FFF) IMRT treatments was investigated. An Elekta Synergy linear accelerator with an Agility collimator capable of delivering FFF beams and a standard iViewGT amorphous silicon (aSi) EPID panel (RID 1640 AL5P) at a fixed SSD of 160 cm were used.
Chuter RW, Rixham PA, Weston SJ, Cosgrove VP.   +3 more
exaly   +5 more sources

Monte Carlo portal dosimetry [PDF]

Medical Physics, 2005
This project developed a solution for verifying external photon beam radiotherapy. The solution is based on a calibration chain for deriving portal dose maps from acquired portal images, and a calculation framework for predicting portal dose maps.
Chin, Mary Pik Wai
openaire   +3 more sources

Automaticin vivoportal dosimetry of all treatments [PDF]

Physics in Medicine and Biology, 2013
At our institution EPID (electronic portal imaging device) dosimetry is routinely applied to perform in vivo dose verification of all patient treatments with curative intent since January 2008. The major impediment of the method has been the amount of work required to produce and inspect the in vivo dosimetry reports (a time-consuming and labor ...
Van Herk, Marcel; id_orcid 0000-0001-6448-898X, Olaciregui-Ruiz, I, Rozendaal, R, Mijnheer, B, van Herk, M, Mans, A   +5 more
openaire   +5 more sources

Development of an Electronic Portal Imaging Device Dosimetry Method [PDF]

Diagnostics, 2021
Support arm backscatter and off-axis effects of an electronic portal imaging device (EPID) are challenging for radiotherapy quality assurance. Aiming at the issue, we proposed a simple yet effective method with correction matrices to rectify backscatter ...
Jun Zhang, Ziting Fan, Xile Zhang, Ruijie Yang, Junhai Wen   +4 more
doaj   +3 more sources

Novel methodologies for dosimetry audits: Adapting to advanced radiotherapy techniques [PDF]

Physics and Imaging in Radiation Oncology, 2018
With new radiotherapy techniques, treatment delivery is becoming more complex and accordingly, these treatment techniques require dosimetry audits to test advanced aspects of the delivery to ensure best practice and safe patient treatment.This review of ...
Marlies Pasler, Victor Hernandez, Núria Jornet, Catharine H. Clark   +3 more
doaj   +2 more sources

Comparison of EPID portal dosimetry verification and RadCalc dose verification for VMAT treatment plans [PDF]

Nowotwory
INTRODUCTION: Dosimetry verification is required before starting each treatment. The legal regulations do not clearly define one method of plan verification.
Adam Gądek, Dominika Plaza, Łukasz Sroka, Marta Reudelsdorf-Ullmann, Krzysztof Ślosarek   +4 more
doaj   +5 more sources

Transit dosimetry of stereotactic body radiotherapy treatments with electronic portal dosimetry device in patient with spinal implant [PDF]

Physical and Engineering Sciences in Medicine, 2022
Abstract Aim In recent years, the use of the Electronic Portal Imaging Device (EPID) as an in vivo dosimeter has become widespread. However, reports of EPID for stereotactic body radiotherapy (SBRT) applications is scarce. There is no data on this topic especially when there are high-density materials in the radiation field.
Yağız Yedekci, Aysenur Elmalı, Gökhan demirkıran, Gökhan Özyigit, Gözde Yazıcı   +4 more
openaire   +3 more sources

Portal dosimetry in radiotherapy repeatability evaluation. [PDF]

J Appl Clin Med Phys, 2021
AbstractThe accuracy of radiotherapy is the subject of continuous discussion, and dosimetry methods, particularly in dynamic techniques, are being developed. At the same time, many oncology centers develop quality procedures, including pretreatment and online dose verification and proper patient tracking methods.
Ślosarek K, Plaza D, Nas A, Reudelsdorf M, Wendykier J, Bekman B, Grządziel A.   +6 more
europepmc   +4 more sources

Monte Carlo portal dosimetry. [PDF]

This project developed a solution for verifying external photon beam radiotherapy. The solution is based on a calibration chain for deriving portal dose maps from acquired portal images, and a calculation framework for predicting portal dose maps.
Chin, Mary Pik Wai
openaire   +2 more sources