I Yeo, J Jung, B Yi, F Piskulich, D Choi… - Medical Physics, 2011 - link.aip.org Purpose: To investigate the response of electronic portal imaging device (EPID) in integration mode for intensity modulated beams including step‐ and‐shoot (SS) and sliding window (SW) deliveries. Methods: We evaluated EPID dose response measurements of open, SS, ...
C Chang, NG Anderson… - Medical Physics, 2011 - link.aip.org Purpose: To provide in vivo 3D dose verification for IMRT treatment sessions using an FFT‐based dose calculation method for heterogeneous media. Methods: Dosimetric calibration of the EPID is performed using an ionization chamber with mini‐phantom. Optical scattering within the ...
[HTML] from jacmp.orgA Kavuma, M Glegg, M Metwaly… - Journal of Applied …, 2011 - jacmp.org In this study, we use the quadratic calibration method (QCM), in which an EPID image is converted into a matrix of equivalent path lengths (EPLs) and, therefore, exit doses, so as to model doses in conformal and enhanced dynamic wedge (EDW) fields. The QCM involves acquiring ... Cached
Z Liu, P Chan, S Li, B Micaily… - Medical Physics, 2011 - link.aip.org Purpose: To evaluate the feasibility of engaging electronic portal imaging device (EPID) in the routine VMAT QA programs. Methods: A small radiation field of 1.6×1.6cm was used to irradiate an 8mm diameter ball bearing positioned precisely at machine isocenter and projected ...
S Blake, P Vial, L Holloway, P Greer… - Medical Physics, 2011 - link.aip.org Purpose: To develop a comprehensive Monte Carlo (MC) model of an indirect‐detection electronicportalimagingdevice (EPID) that can self‐consistently quantify the effect of optical blur on the output signal. Methods: A model ...
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