ESTRO 2024 - Abstract Book

S3347

Physics - Detectors, dose measurement and phantoms

ESTRO 2024

Conclusion:

A phantom, analysis platform and workflow have been developed to allow for a high precision, practical and economical measurement of the geometric accuracy of SIMT SRS dose delivery. Current (for completion by early 2024) developments include deduction of the measurement system precision and application of the measurement to establish the correlation between delivery accuracy and target distance from isocentre for local treatment equipment. Other analyses including absolute dose and comparison of measured and predicted dose distributions via a suitable index will be incorporated. A UK national audit to include a variety of different treatment platforms is planned for 2024.

Keywords: SRS, multiple, phantom

2505

Digital Poster

Can EPID-based 2D in vivo dosimetry detect delivery errors in spine SBRT?

Fátima María Leo, Cristina Ansón, Helena Vivancos, Jaime Perez-Alija, Pedro Gallego, Natalia Tejedor, Marta Barceló, Agustín Ruiz, Alejandro Dominguez, Victor Riu, Pablo Carrasco, Nuria Jornet

Hospital de la Santa Creu i Sant Pau, Medical Physics, Barcelona, Spain

Purpose/Objective:

To evaluate the sensitivity of a commercial EPID-based 2D in-vivo dosimetry (IVD) system to detect machine and positioning errors, and anatomical changes during a complex clinical external beam treatment.

Material/Methods: