ESTRO 2024 - Abstract Book

S4136

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

ESTRO 2024

Conclusion:

Intrafractional motion detection and patient repositioning using frequent stereoscopic X-ray imaging leads to improved safety when applying high BED to critical sites, such as for patients receiving spine SBRT without individualized immobilization. Deviations during the treatment were generally low due to the high frequency of intrafractional imaging. However, analysis of the MCDs, assuming no in-treatment positional corrections, showed that some patients tend to move in the same direction throughout treatment. This would have resulted in large and relevant deviations if shifts had not been applied.

Keywords: Stereoscopic X-ray imaging, ExacTrak Dynamic

50

Proffered Paper

Partial adaptation for online-adaptive proton therapy triggered by prompt gamma imaging

Virginia Gambetta 1,2,3 , Victoria Pieta 1,3 , Jonathan Berthold 1,4,5 , Tobias Hölscher 6 , Albin Fredriksson 7 , Christian Richter 1,2,6 , Kristin Stützer 1,2 1 OncoRay – National Center for Radiation Research in Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Helmholtz-Zentrum Dresden - Rossendorf, Dresden, Germany. 2 Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiooncology - OncoRay, Dresden, Germany. 3 Shared first authorship, -, Dresden, Germany. 4 Center for Advanced Systems Understanding, CASUS, Görlitz, Germany. 5 Helmholtz-Zentrum Dresden - Rossendorf, CASUS – Center for Advanced Systems Understanding, Dresden,