Feasibility of portal dosimetry for flattening filter-free radiotherapy. [PDF]
J Appl Clin Med Phys, 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 +3 more
europepmc +6 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 +6 more
europepmc +4 more sources
Clinical rationale for in vivo portal dosimetry in magnetic resonance guided online adaptive radiotherapy [PDF]
Physics and Imaging in Radiation Oncology, 2022 Background and purpose: In magnetic resonance guided online adaptive radiotherapy, the patient model used for plan adaptation and dose calculation is created online under stringent time constraints.
Begoña Vivas Maiques +3 more
doaj +2 more sources
Prediction of portal dosimetry quality assurance results using log files-derived errors and machine learning techniques [PDF]
Frontiers in Oncology, 2023 ObjectiveThis work aims to use machine learning models to predict gamma passing rate of portal dosimetry quality assurance with log file derived features.
Kah Seng Lew +6 more
doaj +2 more sources
Importance of beam-matching between truebeam stx and novalis tx in pre-treatment quality assurance using portal dosimetry [PDF]
Journal of Medical Physics, 2021 Flexibility and efficiency in a radiotherapy department with different linear accelerators (linacs) can be improved if they are dosimetrically equivalent, and there is no need of plan or patient-specific quality assurance (PSQA) modification.
José Alejandro Rojas-López +1 more
doaj +2 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 +4 more
doaj +3 more sources
On flattening filter-free portal dosimetry. [PDF]
J Appl Clin Med Phys, 2016 Varian introduced (in 2010) the option of removing the flattening filter (FF) in their C‐Arm linacs for intensity‐modulated treatments. This mode, called flattening filter‐free (FFF), offers the advantage of a greater dose rate. Varian's “Portal Dosimetry” is an electronic portal imager device (EPID)‐based tool for IMRT verification.
Pardo E +3 more
europepmc +4 more sources
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 +8 more
europepmc +8 more sources
Implementing log file-based patient-specific QA for VMAT plans: A comparative study of MobiusFX and measurement-based approaches. [PDF]
J Appl Clin Med PhysAbstract Background The current interest in utilizing log file‐based patient‐specific quality assurance (PSQA) is growing as an alternative to measurement‐based approaches for volumetric modulated arc therapy (VMAT) plans. However, implementing log file‐based PSQA requires further experience and understanding since there are no guidelines. Purpose This
Sawapabmongkon T +4 more
europepmc +2 more sources
Current Practices and Clinical Implementation of Electronic Portal Imaging Device-based Dosimetry in Indian Radiotherapy Centres: A National Survey [PDF]
Journal of Medical PhysicsPurpose: This study aims to assess the current prevalence, utilization patterns, and operational challenges of electronic portal imaging device (EPID)-based dosimetry systems in Indian radiotherapy centres. Materials and Methods: A multiple-choice survey
Raghavendra Hajare +7 more
doaj +2 more sources