262 oral A COVERAGE PROBABILITY BASED METHOD TO ESTIMATE PATIENT-SPECIC SMALL BOWEL PLANNING VOLUMES FOR USE IN RADIOTHERAPY

Background and purpose null The aim of this work was to develop a statistical method for generation of patient-specific planning organ-at-risk volumes (PRVs) for the small bowel (SB), by efficient use of a few repeat CT scans. null Materials and methods null The PRVs are generated from a coverage probability (CP) matrix of the small bowel wall (SBW) by thresholding. To estimate the CPs, we extend a previously published ‘relative frequency of...