Results 11 to 20 of about 10,962 (218)

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

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

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, Novais JC, Molina López MY, Ruiz Maqueda S.   +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, Rozendaal R, Camargo P, Mans A, Wendling M, Olaciregui-Ruiz I, Sonke JJ, Van Herk M, Mijnheer B.   +8 more
europepmc   +8 more sources

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, Rixham PA, Weston SJ, Cosgrove VP.   +3 more
europepmc   +4 more sources

Patient-specific quality assurance for extremely small field sizes using 3D in vivo dosimetry in fractionated stereotactic radiosurgery for brain metastases. [PDF]

J Appl Clin Med Phys
Abstract Background Fractionated stereotactic radiosurgery (fSRS) using LINAC‐based volumetric‐modulated arc therapy (VMAT) has become widely adopted and achieved favorable outcomes. However, this technique involves extremely small field sizes, making pre‐treatment quality assurance (QA) with high‐resolution detectors essential.
Jumonji K, Takatsu J, Hara N, Fan R, Shimomura R, Inoue T, Iijima K, Okonogi N, Murakami N, Shikama N.   +9 more
europepmc   +2 more sources

The Spinning Manny Indexed Overlay System for VMAT total body irradiation. [PDF]

J Appl Clin Med Phys
Abstract Purpose While modern intensity‐modulated techniques for total body irradiation (TBI) offer superior organ sparing and improved dose coverage compared to conventional TBI, their complexity has limited widespread adoption. Specifically, when treating individuals with Volumetric Modulated Arc Therapy (VMAT‐TBI), a transition between the head ...
Skinner L, Simiele E, Yang Z, Hui C, Romero I, Binkley M, Hoppe R, Hiniker SM, Kovalchuk N.   +8 more
europepmc   +2 more sources

Editorial: 2^nd collection of special issue in innovations, advances, and challenges in precision radiation oncology physics. [PDF]

Precis Radiat Oncol
Precision Radiation Oncology, Volume 9, Issue 4, Page 232-233, December 2025.
Guan F, Campelo S, Jiang Z, Bronk L.
europepmc   +2 more sources

Planar EPID-Based Dosimetry for SRS and SRT Patient-Specific QA

Life, 2021
The study’s purpose was to develop and validate Electronic Portal Imaging Device (EPID)-based dosimetry for Stereotactic Radiosurgery (SRS) and Stereotactic Radiation Therapy (SRT) patient-specific Quality Assurance (QA).
Sangutid Thongsawad, Tadchapong Chanton, Nipon Saiyo, Nuntawat Udee   +3 more
doaj   +1 more source

Commissioning and Evaluation of an Electronic Portal Imaging Device-Based In-Vivo Dosimetry Software. [PDF]

, 2018
This study reports on our experience with the in-vivo dose verification software, EPIgray® (DOSIsoft, Cachan, France). After the initial commissioning process, clinical experiments on phantom treatments were evaluated to assess the level of accuracy of ...
Cheung, Joey, Held, Mareike, Husson, François, Morin, Olivier, Perez Andujar, Angelica   +4 more
core   +2 more sources