ESTRO 2024 - Abstract Book

S5975

RTT - Treatment planning, OAR and target definitions

ESTRO 2024

Conclusion:

While there is a clear difference in time needed for contour adaptation, the overall metric results between groups were comparable. The dosimetric analysis also showed promising results in terms of CTV coverage. Future work will focus on improving these results and reducing contour adaptation time by additional training.

Keywords: MRIdian, contour adaptation, online workflow

1652

Digital Poster

Atlas-based segmentation to auto contour targets and organ at risks for craniospinal irradiation

Corrinne Souici 1 , Tegan Courtot 1 , Lukasz Klobukowski 1 , Irena Blasiak-Wal 1 , Liam Welsh 1 , Henry Mandeville 2,3

1 The Royal Marsden NHS Foundation Trust, Department of Radiotherapy, London, United Kingdom. 2 The Royal Marsden NHS Foundation Trust, Children & Young People’s Unit and Haemato-oncology Unit, London, United Kingdom. 3 The Institute of Cancer Research, Department of Radiotherapy, London, United Kingdom

Purpose/Objective:

Craniospinal irradiation (CSI) for medulloblastoma, and other malignant brain tumours with a high risk of cerebrospinal fluid dissemination, requires extensive contouring of multiple targets and organ at risks (OARs), and manual contouring of these structures is time consuming. There is now the potential to automate outlining and streamline planning using atlas-based initialisation (ABI) within the Raystation treatment planning system. The aim of this project was to produce and evaluate an automatic contouring atlas to facilitate planning for CSI using volumetric modulated arc therapy.

Material/Methods: