ESTRO 2024 - Abstract Book

S3395

Physics - Detectors, dose measurement and phantoms

ESTRO 2024

The fD detectors agree within 1%. Small differences in response to PRF of the detectors or in system output of yet unknown origin are present. The dose output of the systems presents similarities, but complete commissioning is needed for each unit. The monitoring system needs to be calibrated in each beam configuration, as differences were found. Nominal pulse length is different from the effective pulse length, and linearly proportional.

Conclusion:

We present the first data on the comparison of two nominally similar units with two independent detectors specifically developed for FLASH studies, towards the development of common procedures for commissioning and QA of preclinical studies.

Keywords: UHDR, diamond detector, monitor system

References:

1 F. Di Martino, G. Felici et al., FLASH Radiotherapy with electrons: issues related to the production, monitoring and dosimetric characterization of the beam, Front. Phys. - Medical Physics and Imaging, DOI: 10.3389/fphy.2020.570697

2 Marinelli M, Felici G, Galante F, Gasparini A, Giuliano L, Heinrich S, Pacitti M, Prestopino G, Vanreusel V, Verellen D, Verona C, Verona Rinati G. Design, realization, and characterization of a novel diamond detector prototype for FLASH radiotherapy dosimetry. Med Phys. 2022 Mar;49(3):1902-1910. doi: 10.1002/mp.15473. Epub 2022 Jan 31. PMID: 35064594; PMCID: PMC9306529.

3101

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Standardized stray radiation assessment of a mobile accelerator in an operating room

Piet Stevens 1 , Verdi Vanreusel 2 , Louis-Philippe Desmedt 3 , Giuseppe Felici 4 , Alessia Gasparini 1 , Dirk Verellen 1

1 Iridium netwerk, radiotherapy, Wilrijk, Belgium. 2 UAntwerpen, radiotherapy, Wirlijk, Belgium. 3 UAntwerpen, radiotherapy, Wilrijk, Belgium. 4 Sordina, radiotherapy, Aprilia, Italy

Purpose/Objective:

Intra-operative radiation therapy (IORT) is an RT treatment performed during surgery. The linear accelerator system often delivers high doses per pulse and is ideally placed in an unshielded operating room (OR). The goal of this study is to determine generally applicable materials and methods to map the photon scattered radiation (SR) from a linear accelerator for IORT.