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. 2010 Apr 19;11(2):140–157. doi: 10.1120/jacmp.v11i2.3185

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© 2010 The Authors.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Progression of conversion of a raw EPID image into an absolute dose plane. Panel A illustrates the geometric scaling from the EPID distance to the desired dose plane distance. Panel B shows the scaling of each pixel by the 2D output correction map, derived using the MLC segment data (size, shape, relative meterset weight). Panel C shows the convolution with the dose redistribution kernel to emulate dose distribution in a water phantom at the modeled QA dose plane depth. Panel D illustrates the conversion to absolute dose values using the wide field calibration map.