Results 161 to 170 of about 313,243 (217)
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Transit dosimetry in dynamic IMRT with an a-Si EPID
Medical and Biological Engineering and Computing, 2014Using an amorphous silicon (a-Si) EPID for transit dosimetry requires detailed characterization of its dosimetric response in a variety of conditions. In this study, a measurement-based model was developed to calibrate an a-Si EPID response to dose for transit dosimetry by comparison with a reference ionization chamber. The ionization chamber reference
Mahsheed Sabet +2 more
exaly +4 more sources
Dosimetric properties of fluoroscopic EPID for transit dosimetry [PDF]
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. +4 more
semanticscholar +4 more sources
Characterization of EPID software for VMAT transit dosimetry
Australasian Physical & Engineering Sciences in Medicine, 2018Dosimetry 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 +6 more
openaire +3 more sources
The application of transit dosimetry to precision radiotherapy
Medical Physics, 1996A method of using electronic portal imaging (EPI) for transit dosimetry is described. In this method, a portal image of the treatment field is first aligned with a digitally reconstructed radiograph (DRR) to geometrically relate the computed tomography (CT) scan, used to generate the DRR, with the EPI.
V N Hansen, P M Evans, William Swindell
exaly +5 more sources
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
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
Implementation of EPID transit dosimetry based on a through-air dosimetry algorithm
Medical Physics, 2011A 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 +3 more
semanticscholar +4 more sources
A global calibration model for EPIDs used for transit dosimetry
Medical Physics, 2007Electronic 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
André Dekker
exaly +3 more sources
An Efficient Approach to EPID Transit Dosimetry [PDF]
, 2022 Introduction: In order to maintain uniform standards in the accuracy of fractionated radiation therapy, quantification of the delivered dose per fraction accuracy is required.
Morris, Bart Alan
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VALIDATION OF A TRANSIT DOSIMETRY SOFTWARE WITH IONIZATION CHAMBER MEASUREMENTS
Physica Medica, 2022Savannah Pié-Padró +1 more
openaire +2 more sources