ESTRO 2024 - Abstract Book

S4383

Physics - Intra-fraction motion management and real-time adaptive radiotherapy

ESTRO 2024

Conclusion:

Analysis of MRIg-SABR delivered fractions showed that at least 70% of all patients needed an intervention to correct for intra-fractional changes. Intra-fraction corrections exceeding the PTV margin amounted 42% of all cases. A small proportion of patients needed treatment compensation with an additional (partial) fraction due to the large anatomical changes observed that could not be corrected by means of a 3D translation. DIR-based dose accumulation with intra-fractional plan reoptimization was found needed in MRIg-SABR to account for intra-fractional changes.

Keywords: MRI-guided radiotherapy, SABR, online correction

2917

Mini-Oral

Patient specific in silico investigation of gated and MLC-tracked MR-guided prostate radiotherapy

Emilia Persson 1,2,3 , Björn Eiben 1 , Simeon Nill 1 , Edmund Goodwin 1 , Andreas Wetscherek 1 , Alison C Tree 4 , Uwe Oelfke 1