ESTRO 2024 - Abstract Book

S1493

Clinical - Lower GI

ESTRO 2024

Conclusion:

This QA project has led to clarifications concerning how to contour target volumes and OARs via an updated GL to reduce interobserver variation. A follow-up QA project is planned to take place during the spring 2024 where the effect of the new GL is to be evaluated. When gross errors/discrepancies have been reduced, we aim to assess the remaining statistical delineation variations to validate the appropriateness of our PTV margins for rectal cancer patients.

Keywords: Delineation, Margins, Rectum

References:

Swedish National Care Program for Rectal Cancer, RCC 2023

741

Digital Poster

Dynamic evolution of IVIM-DWI in rectal cancer patients treated with a SC-RT on a 1.5T MR-Linac

Madeline Michel 1 , Zelda Paquier 2 , Nicolas Coquelet 3 , Akos Gulyban 2 , Nick Reynaert 2 , Dirk Van Gestel 1 , Robbe Van den Begin 1 , Philippe Martinive 1 1 Institut Jules Bordet, Hôpital Universitaire de Bruxelles, Radiation-oncology, Brussels, Belgium. 2 Institut Jules Bordet, Hôpital Universitaire de Bruxelles, Medical physics, Brussels, Belgium. 3 Institut Jules Bordet, Hôpital Universitaire de Bruxelles, Radiology, Brussels, Belgium

Purpose/Objective: