![]() Several studies have investigated the effects of gravity on the sag of these systems but each have limitations. The application of EPIDs for dosimetry in arc treatments requires accurate characterization of the mechanical sag of the EPID and gantry during rotation. Purpose: Electronic portal imaging devices ( EPIDs) have been studied and used for pretreatment and in-vivo dosimetry applications for many years. Rowshanfarzad, Pejman Sabet, Mahsheed O'Connor, Daryl J. Detection and correction for EPID and gantry sag during arc delivery using cine EPID imaging ![]()
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