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ST: Fachverband Strahlen- und Medizinphysik

ST 5: Detector Physics

ST 5.2: Vortrag

Mittwoch, 2. April 2025, 16:30–16:45, ZHG003

Hardware Testing for the Construction of a Compton Camera Prototype — Yazeed Balasmeh, Daniel Berker, Ivor Fleck, and •Lars Maczey — Experimentelle Teilchenphysik, Center for Particle Physics Siegen, Universität Siegen

Well-established detector systems for medical imaging such as PET or SPECT can only efficiently resolve source positions for gamma energies up to 600 keV. Compton cameras have been able to exceed the range to higher energies, but to date are limited to energies below 1 MeV. The Compton camera under construction at the University of Siegen pursues the novel approach of tracking the electron of a Compton scattering process based on its production of Cherenkov radiation, in the hope of overcoming the current limitations and creating new fields of study.

In this talk, I present first results obtained towards the construction of a Compton camera prototype, focusing mainly on the characterisation of hardware components, including UV-sensitive SiPMs from Broadcom Inc. and Hamamatsu Photonics, scintillation crystals such as GAGG and LGSO as well as readout ASICs such as the TOFPET2 ASIC from PETsys Electrionics or the KLauS chip developed by the University of Heidelberg. Regarding SiPMs, bias optimisation is discussed to ensure both a good noise behaviour and good detection efficiency. Results from depth of interaction measurements and energy calibrations performed by scintillator-based setups and the development of a multi-channel SiPM detection system are also presented.

Keywords: Medical Imaging; Compton Camera; Silicon Photomultipliers; Cherenkov Light Detection