ESTRO 2025 - Abstract Book

S3511

Physics - Optimisation, algorithms and applications for ion beam treatment planning

ESTRO 2025

Conclusion: Adding ST layers to discrete proton arc plans results in dosimetric advantages and could reduce the need for dynamic collimation. While these plans could be delivered with a gantry, upright arcs come with the additional benefit of a single beam dump opposite the fixed beam line and possibilities for simple range verification from a multitude of directions.

Keywords: Proton arcs, upright radiotherapy, shoot-through

References: 1. de Jong, B. et al., Spot scanning proton arc therapy reduces toxicity in oropharyngeal cancer patients, Med Phys 2022. 2. Kong, W. et al., Reducing the lateral dose penumbra in IMPT by incorporating transmission pencil beams, Radiother Oncol 2024.