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• W2094005774 abstract "Images produced by commercial amorphous silicon electronic portal imaging devices ( ‐Si EPIDs) are subject to multiple blurring processes. Implementation of these devices for fluence measurement requires that the blur be removed from the images. A standard deconvolution operation can be performed to accomplish this assuming the blur kernel is spatially invariant and accurately known. This study determines a comprehensive blur kernel for the Varian aS500 EPID. Monte Carlo techniques are used to derive a dose kernel and an optical kernel, which are then combined to yield an overall blur kernel for both 6 and 15 MV photon beams. Experimental measurement of the line spread function (LSF) is used to verify kernel shape. Kernel performance is gauged by comparing EPID image profiles with in‐air dose profiles measured using a diamond detector (approximating fluence) both before and after the EPID images have been deconvolved. Quantitative comparisons are performed using the metric, an extension of the well‐known metric, using acceptance criteria of 0.0784 cm (1 pixel width) distance‐to‐agreement and 2% of the relative central axis fluence . Without incorporating any free parameters, acceptance was increased from 49.0% of pixels in a cross‐plane profile for a 6 MV open field to 92.0%. For a physically wedged field, acceptance increased from 40.3% to 73.9%. The effect of the optical kernel was found to be negligible for these acceptance parameters, however for , we observed an improvement from 66.1% (without) to 78.6% (with) of scores (from 20.6% before deconvolution). It is demonstrated that an empirical kernel having a triple exponential form or a semiempirical kernel based on a simplified model of the detector stack can match the performance of the comprehensive kernel." @default.
• W2094005774 created "2016-06-24" @default.
• W2094005774 creator A5055059445 @default.
• W2094005774 creator A5069784123 @default.
• W2094005774 date "2005-03-29" @default.
• W2094005774 modified "2023-10-16" @default.
• W2094005774 title "Comprehensive Monte Carlo calculation of the point spread function for a commercial a-Si EPID" @default.
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• W2094005774 doi "https://doi.org/10.1118/1.1869072" @default.
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