ESTRO 2025 - Abstract Book

S3521

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

ESTRO 2025

Conclusion: This study demonstrates that SPArc performance under GPE is dependent on arc range and prescription dose. The results provide the first simulation-based reference to guide future investigations into SPArc treatment delivery accuracy and quality assurance.

Keywords: proton arc therapy, gantry error

3273

Digital Poster Photon vs. proton treatment planning for thoracic reirradiation in the Scandinavian CURE Lung trial Maria Fuglsang Jensen 1 , Marianne Marquard Knap 2 , Mai-Britt Linaa 2 , Hanna Rahbek Mortensen 1,3 , Ane Appelt 4 , Lone Hoffmann 2,3 1 Danish Centre for Particle Therapy, Aarhus University Hospital, Aarhus, Denmark. 2 Department of Oncology, Aarhus University Hospital, Aarhus, Denmark. 3 Department of Clinical Medicine, Aarhus University, Aarhus, Denmark. 4 Leeds Institute of Medical Research, University of Leeds, Leeds, United Kingdom Purpose/Objective: The upcoming Scandinavian CURE Lung trial investigates the safety of high-dose reirradiation of thoracic tumours. This study compares photon and proton reirradiation plans according to the study protocol in a retrospective cohort, with the aim of identifying when protons could be beneficial.