ESTRO 2024 - Abstract Book

S3636

Physics - Dose prediction, optimisation and applications of photon and electron planning

ESTRO 2024

1a) when accumulating doses using global and OW DIR, respectively. Small differences were seen for GTV D95%, which was 2.26% and -0.47% for all treatment courses for global and OW DIR, respectively.

Conclusion:

We have evaluated two DIR strategies for estimating delivered dose for abdominal OAR. In this study, a clear geometrical advantage was observed for OW DIR compared to the Global DIR strategy. Notice, however, that not all registrations reached the cut of mDTA ≤ 3mm, proposed by TG-132 (2), which could be caused by starting the registration using a global rigid frame-of-reference registration instead of organ-specific initialisation. Besides further geometrical evaluation, including ongoing work evaluating geometric performance with sub-organ