Dortmund 2021 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 12: Compton Cameras
ST 12.1: Vortrag
Donnerstag, 18. März 2021, 16:00–16:15, STa
A GAGG-based scatter component for Compton imaging below 1.5 MeV — •Tim Binder1,2, Vasiliki Anagnostatou1, Jennifer Zhou1, Kei Kamada3, Katia Parodi1, and Peter G. Thirolf1 — 1LMU Munich, Garching — 2Ketek GmbH, Munich — 3C&A Corporation, Sendai
Compton cameras (CC) have been shown to be a suitable tool for spatially resolved γ detection. Other than conventional collimated systems such as slit- and γ-cameras, CCs promise higher detection efficiencies and 3D reconstruction of the γ-emission centers, making CCs interesting for a variety of applications.We are developing a CC prototype to be used for range verification in hadron therapy. While our monolithic scintillator used as absorber provides excellent spatial, time and energy resolution and high efficiency for γ detection up to 6 MeV, our multilayer scatter component of double-sided Si strip detectors is capable of e−-tracking resulting in a further improved efficiency. However, changing the scatter component makes the CC suitable also for other applications where energies are too low (< 1.5 MeV) for adequate e−-tracking and the higher efficiency of a scintillator-based scatter component is more desirable, such as for (triple-coincidence) γ-PET. Such a detector, a 16×16 matrix of GAGG crystals coupled to a SiPM array has been characterized for its spatial and energy resolution. In an intermediate step towards the final prototype, a CC where such a GAGG-based detectors is used as scatterer and absorber component has been commissioned. Results of a 3D reconstructed 137Cs point source and the achievable spatial resolution of the camera system will be presented. Supported by BFS & EU MSCA-IF HIPPOCRATE.