SU‐E‐J‐11: Preliminary Investigation of Cone‐Beam CT Post‐Planning Feasibility

Purpose: Characterization of the accuracy of the dose delivery for pelvic adaptive radiotherapy using cone‐beam CT for post‐planning. Methods: A commercially available phantom (CIRS 062) was modified to allow for full scatter conditions in a cone‐beam CT radiation field. Various density inserts were used to calibrate the Hounsfield Unit (HU) to electron density (ED) for all of our Varian linacs with installed On‐Board Imagers (OBI). Different …