ESTRO 2024 - Abstract Book

S76

Invited Speaker

ESTRO 2024

3446

Overview and report from the 2021 ESTRO Physics workshop topic on DIR commissioning and QA

Mohammad Hussein 1 , Michael Jameson 2

1 National Physical Laboratory, Radiotherapy and Radiation Dosimetry, Teddington, United Kingdom. 2 GenesisCare, NSW Physics, Sydney, Australia

Abstract:

Deformable Image Registration (DIR) is now integrated in most commercial radiotherapy treatment planning software. DIR is becoming an essential tool in a variety of applications such as multimodality image registration, guiding and adapting treatment delivery to account for changes patient anatomy, contour propagation, dose propagation, retreatments, and in follow-up studies investigating the effects and outcomes of radiotherapy treatments. However a challenge for radiotherapy departments is in the safe commissioning and confidence in using DIR algorithms, and developing ongoing quality assurance (QA). Some of the challenges include: how to robustly quality assure (QA) and validate DIR, what to do if there is a problem with the registration with DIR in a clinical system, how to apply the results of the deformation to warp radiotherapy dose distributions and the associated uncertainties, and the need for clinically relevant metrics. This topic was discussed at European SocieTy for Radiotherapy and Oncology (ESTRO) physics workshop 2021. The workshop track was organised in collaboration with the Australasian College of Physical Scientists and Engineers in Medicine (ACPSEM). In total we had 20 enthusiastic participants and three invited speakers. The participants came from clinical practice, academia and industry at all career levels, as well as eminent international experts who gave thought-provoking presentations which helped to stimulate discussion. The workshop was run in three online sessions. The first session, in May 2021, was a “meet and greet”, in which participants introduced themselves and their work and explained why they wanted to take part in the workshop. The second session in September 2021 was dedicated to the provision of detailed pitches from participants and discussion of ideas in the whole group. The final session in October 2021 was a day of brainstorming in which Zoom breakout rooms were used to discuss ideas and potential outcomes, inspired by selection of the common ‘hot topics’ that had been raised in the pitches. Outcomes for the workshop have been published and further follow-up projects are ongoing. They include review and recommendation papers which will be presented by invited speakers during the Symposium, and in the future shared datasets and tools, and potentially training courses. The workshop also enabled participants to make contact with each other develop collaborations. It is hoped that these outcomes will lead to future impact in clinical practice.

This presentation will give a summary of the workshop, headline outcomes and future directions.