ESTRO 2022 - Abstract Book

S700

Abstract book

ESTRO 2022

Conclusion We have developed a method for parametrization of delineations of LADCA. We have successfully used the method for characterization of LADCA delineations in a national DBCG patient cohort. Our results showed significant differences in delineations of LADCA among centers and need for regularly QA regarding delineations. This method has potential as a metric for QA, and to be generalizable for other tubular structures.

Proffered Papers: Adaptive radiotherapy

OC-0781 Re-planning assessment in head and neck cancer radiotherapy: 3 years single institution experience

F. Sousa 1 , Y. Jourani 1 , T. Dragan 1 , S. Beauvois 1 , M. Somoano 1 , D. Van Gestel 1

1 Institut Jules Bordet - Université Libre de Bruxelles, Radiation Oncology Department, Brussels, Belgium

Purpose or Objective During head and neck radiotherapy (RT), variations such as patient weight loss, tumor regression and/ or diminution of the volume of organs at risk (OARs) are likely to occur. These variations may result in changes in the dose distribution that cannot be compensated for by a simple rigid repositioning. In order to more easily prioritize these variations according to their potential impact, an Image-Guided traffic light protocol (IG-TLP; Figure 1) has been implemented in 2018 in our department as a clinical decision support system. The aim of this study was to evaluate how often treatment plan adaptation was done after daily CBCT analysis and which anatomical changes reported in the IG-TLP required adaptation. Secondly, we aimed to identify subgroups of patients where re-plans were often executed.

Materials and Methods

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