ESTRO 2023 - Abstract Book

S1647

Digital Posters

ESTRO 2023

Conclusion If we only account for motion during beam-on, a BED 10 >117 Gy to GTV was ensured even without a PTV for the assessed dose prescription. Omitting the PTV would spare dose to healthy liver and may improve options for re-treatments or targets close to organs at risk. However, other sources of geometrical errors should be considered.

PO-1901 Comparing LSTM networks for real-time target segmentation prediction on low-field MR-linacs

E. Lombardo 1 , M. Rabe 1 , Y. Xiong 1 , L. Nierer 1 , D. Cusumano 2 , L. Placidi 2 , L. Boldrini 2 , S. Corradini 1 , M. Niyazi 1 , M. Reiner 1 , C. Belka 1,3 , C. Kurz 1 , M. Riboldi 4 , G. Landry 1 1 University Hospital, LMU Munich, Radiation Oncology, Munich, Germany; 2 Fondazione Policlinico Universitario Agostino Gemelli, Radiation Oncology, Rome, Italy; 3 German Cancer Consortium , DKTK, Munich, Germany; 4 Ludwig-Maximilians Universität München, Faculty of Physics, Munich, Germany Purpose or Objective Respiratory motion leads to less conformal tumor treatment and increased dose to healthy tissues. Magnetic resonance imaging guided radiotherapy (MRgRT) enables the continuous acquisition of high soft tissue contrast images to monitor and