Berlin 2024 – wissenschaftliches Programm

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ST: Fachverband Strahlen- und Medizinphysik

ST 5: Poster Session

ST 5.7: Poster

Mittwoch, 20. März 2024, 11:00–12:30, Poster A

From a single to a multi-channel array Prompt Gamma detection system based on PETsys Electronics — •Olga Novgorodova and Arno Straessner — IKTP TU Dresden, Dresden, Germany

Prompt Gammas (PG) in proton therapy are one of the developing techniques for non-invasive measurement of the in-vivo proton range. For the prompt gamma timing (PGT) application, we have successfully characterized a single channel system of a CeBr₃ crystal read out by a SiPM based on PETsys Electronics. Both time and spectral characteristics achieved the required resolution. Measurements at the OncoRay TU Dresden facility with energies between 100 and 162 MeV protons suffered from very low statistics for a single channel. We investigated several multi-channel arrays that were read out by Hamamatsu SiPMs with 3x3 mm² dimensions and 50 µm microcells, as well as by Sensl SiPMs with 6x6 mm² dimensions and 35 µm microcells, and Hamamatsu SiPMs with 6x6 mm2 dimensions and 25 and 50 µm microcells. We present our investigation of system characteristics, including crosstalk and homogeneity, as well as energy and time spectra using multi-channel CeBr₃ crystal array.