ESTRO 2025 - Abstract Book

S3089

Physics - Inter-fraction motion management and offline adaptive radiotherapy

ESTRO 2025

Conclusion: The HD of ITVs defined on repeated 4D-MRI datasets collected ten minutes apart were more similar than those collected one week apart. An additional uncertainty of ~7mm needs to be accounted for when adapting to an ITV delineated on one-week old, rather than 10-minute old 4D-MRI.

Keywords: 4D-MRI, lung cancer, adaptive radiotherapy,