Results 11 to 20 of about 3,312 (171)
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
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
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
Verification of IMRT and RapidArc Localized Prostate Cancer Treatment Plans Using EPID and Delta4 in vivo Dosimetry Methods [PDF]
Middle East Journal of Cancer, 2021 Background: Quality assurance for intensity modulated radiation therapy (IMRT) depends on the type of dosimetry system and its evaluation procedure. We can check both the intensity and distribution of each field as the required pretreatment verification ...
Moustafa Ahmed +4 more
doaj +1 more source
Journal of Medical Physics, 2023 Aim: The Mobius3D software addresses limitations lacking in measurement-based methods in patient-specific quality assurance (QA). The objective of this study was to validate its dosimetric performance against conventionally used portal dose measurements ...
Yasmine Joy M. Labagnoy +3 more
doaj +1 more source
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 +4 more sources
Craniospinal irradiation by volumetric modulated arc therapy technique on halcyon
Journal of Radiation and Cancer Research, 2022 Aims: Craniospinal irradiation (CSI) is a challenging task on halcyon due to its field size constraint (28 cm × 28 cm). CSI was planned by volumetric modulated arc therapy (VMAT) technique on Halcyon (6MV) linac with no junction shift with multiple arcs ...
Shubhangi Barsing +3 more
doaj +1 more source
EVALUATION STUDY FOR ELECTRONIC PORTAL IMAGER SYSTEM DEVICE (EPID) AS QUALITY ASSURANCE AND DOSIMETRY TOOL FOR MEDICAL LINEAR ACCELERATOR MACHINE [PDF]
Assiut University Journal of Multidisciplinary Scientific Research, 2020 Portal imager system now is widely attached as verification system in many models from linear accelerator due to may be used for treatment verification instead of film in as new ear for radiotherapy.
doaj +1 more source
An Empirical Transmitted EPID Dosimetry Method using a Back-Projection Algorithm [PDF]
Journal of Biomedical Physics and Engineering, 2019 Background: The present study aimed to introduce a rapid transmission dosimetry through an electronic portal-imaging device (EPID) to achieve two-dimensional (2D) dose distribution for homogenous environments. Material and Methods: In this Phantom study,
S M Hashemi +8 more
doaj +1 more source
Novel methodologies for dosimetry audits: Adapting to advanced radiotherapy techniques
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 +3 more
doaj +1 more source