Heidelberg 2022 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 2: Poster Session
ST 2.1: Poster
Montag, 21. März 2022, 16:15–17:30, P
Characterization of a multi-arm Compton-camera setup — •Henning Geesmann1, Giullio Lovatti1, Tim Fitzpatrick1,2, Jennifer Zhou1, Mohammad Safari1, Florian Schneider2, Vassia Anagnostatou1, Katia Parodi1, and Peter G. Thirolf1 — 1Ludwig-Maximilians-Universität, Munich, Germany — 2KETEK GmbH, Munich, Germany
PET, γ-PET and prompt-γ imaging are all γ-ray based imaging techniques that can be used for beam range verification in particle therapy. They can all be realised by a multi-arm Compton camera (CC) setup.
We characterized a system where a single CC arm of the setup comprises a 16×16 pixelated GAGG crystal array as scatterer (26×26×6 mm3, read out by one 25µm microcell SiPM array) and a monolithic absorber (LaBr3:Ce or CeBr3 crystal, 51×51×30 mm3), read out by four 50µm microcell SiPM arrays). The characterization of the setup in terms of spatial resolution and efficiency is based on the use of different γ-ray point sources (511, 662 and 1274 keV) and several spatial arrangements of up to four CC arms. Further, the angular dependence of the Compton scattering kinematics can be exploited to identify spatial arrangements (scatterer/absorber) in a single CC arm that allow to select a certain regime of energies being deposited in the scatterer and, thus, allow for enhancing the performance of the setup. A summary of the latest status of the ongoing studies will be given.
This work was supported by the Bayerische Forschungsstiftung, by the ERC grant No. 725538 (SIRMIO) and by Sklodowska-Curie Individual Fellowship project HIPPOCRATE.