Results 151 to 160 of about 244,363 (195)

Evaluation of computed tomography assisted and transit dosimetry treatment planning with thermoluminescent dosimetry measurements

International Journal of Radiation Oncology Biology Physics, 1980
Abstract Transit dosimetry methods have been compared with computer plans which use computed tomography (CT) determined patient geometry to make corrections for inhomogeneities in radiation therapy treatment planning. These two planning methods have been applied to treatment sites in the head and chest of an anthropomorphic phantom.
Donald E Velkley
exaly   +3 more sources

A global calibration model for EPIDs used for transit dosimetry

Medical Physics, 2007
Electronic portal imaging devices (EPIDs) are not only applied for patient setup verification and detection of organ motion but are also increasingly used for dosimetric verification. The aim of our work is to obtain accurate dose distributions from a commercially available amorphous silicon EPID for transit dosimetry applications. For that purpose, a
B J Mijnheer
exaly   +3 more sources

Implementation of EPID transit dosimetry based on a through-air dosimetry algorithm

Medical Physics, 2011
A method to perform transit dosimetry with an electronic portal imaging device (EPID) by extending the commercial implementation of a published through-air portal dose image (PDI) prediction algorithm Van Esch et al. [Radiother. Oncol. 71, 223-234 (2004)] is proposed and validated.
Sean L. Berry, Ren-Dih Sheu, Cynthia S. Polvorosa, Cheng-Shie Wuu   +3 more
openaire   +3 more sources

An electronic portal imaging device for transit dosimetry

Physics in Medicine and Biology, 1997
An electronic portal imaging device has been designed and constructed. It consists of an array of 128 CsI scintillation crystals coupled to photodiodes which is scanned across the field in 4 seconds. The linac is operated at a dose rate of 400 cGy min-1 and the dose delivered for image acquisition is approximately 27 cGy.
SymondsTayler, JRN, Partridge, M, Evans, PM   +2 more
openaire   +4 more sources

Characterization of EPID software for VMAT transit dosimetry

Australasian Physical & Engineering Sciences in Medicine, 2018
Dosimetry check (DC) is a commercial software that allows reconstruction of 3D dose distributions using transit electronic portal imaging device (EPID) images. In this work, we evaluated the suitability of DC software for volumetric modulated arc therapy (VMAT) transit dosimetry.
Marco Esposito, Andrea Bruschi, Paolo Bastiani, Alessandro Ghirelli, Silvia Pini, Serenella Russo, Giovanna Zatelli   +6 more
openaire   +2 more sources

TransitQA — A new method for transit dosimetry of Tomotherapy patients

Medical Physics, 2017
PurposeTransitQA is an innovative method for Tomotherapy transit dosimetry using the on‐board detector (OBD). Our previously published model for Tomotherapy treatment plan verification (AirQA) has been enhanced to take into account patient and couch transmission.
Olivier, Pisaturo, Frédéric, Miéville, Pierre-Alain, Tercier, Abdelkarim Said, Allal   +3 more
openaire   +2 more sources

Dosimetric properties of fluoroscopic EPID for transit dosimetry

Journal of Radiotherapy in Practice, 2014
AbstractThe aim of this work was to evaluate dose response of fluoroscopic EPID for transit dosimetry applications. Properties studied included warm up time, build-up thickness evaluation, dose history, linearity, stability, and short and long-term reproducibility of EPID response, as well as field size dependence.Pixel value matrices of electronic ...
Anvari, A., Aghamiri, S., Mahdavi, S., Alaei, P., Mohammadi, M.   +4 more
openaire   +2 more sources

Evaluation of the Accuracy of Dose Delivery for IMRT Based on Transit Dosimetry

Health Physics, 2014
The authors have developed and evaluated a new method that uses transit dose in the treatment room in verification of dose delivery to patients. Five intensity modulated radiotherapy (IMRT) plans were selected from actual cancer patients, and transit dose was measured using MapCHECK 2 and an anthropomorphic phantom.
Tae Seong, Baek, Eun Ji, Chung, Eui Kwan, Koh, Jungju, Seo, Myonggeun, Yoon   +4 more
openaire   +2 more sources

Transit dosimetry in IMRT with an a-Si EPID in direct detection configuration

Physics in Medicine and Biology, 2012
In this study an amorphous silicon electronic portal imaging device (a-Si EPID) converted to direct detection configuration was investigated as a transit dosimeter for intensity modulated radiation therapy (IMRT). After calibration to dose and correction for a background offset signal, the EPID-measured absolute IMRT transit doses for 29 fields were ...
Sabet, Mahsheed, Rowshanfarzad, Pejman, Vial, Philip, Menk, Frederick W., Greer, Peter B.   +4 more
openaire   +2 more sources

A simple model for transit dosimetry based on a water equivalent EPID

Medical Physics, 2018
PurposeThe aim of this study was to demonstrate a new model for implementing a transit dosimetry system as a means of in vivo dose verification with a water equivalent electronic portal imaging device (WE‐EPID) and a conventional treatment planning system (TPS).Method and materialsA standard amorphous silicon (a‐Si) EPID was modified to a WE‐EPID ...
Deshpande, Shrikant, Blake, Samuel J, Xing, Aitang, Metcalfe, Peter E, Holloway, Lois C, Vial, Philip J   +5 more
openaire   +3 more sources