Evaluation of the PETsys TOFPET2 ASIC in multi-channel coincidence experiments

Abstract Background Aiming to measure the difference in arrival times of two coincident γ -photons with an accuracy order 200ps, time-of-flight positron emission tomography systems commonly employ silicon photomultipliers (SiPMs) and high-resolution digitization electronics, application specific integrated circuits (ASICs). This work evaluates performance TOFPET2 ASIC, released by PETsys Electronics S.A. 2017, dependent on its configuration parameters multi-channel coincidence measurements. Methods SiPM arrays fabricated different vendors (KETEK, SensL, Hamamatsu, Broadcom) were tested combination ASIC. Scintillator featuring reflector designs configurations ASIC software evaluated. The benchtop setup used is provided evaluation kit Results Compared existing studies results a larger set obtained that have not been reported this extend so far. shows promising CRTs down 219.9 ps Hamamatsu S14161-3050-HS-08 (128 channels read out, energy resolution 13.08%) 216.1 Broadcom AFBR-S4N44P643S (32 9.46%). length trigger delay dark count suppression scheme has impact can be configured further improve time. integrator gain investigated allows absolute improvement up 1% at cost linearity spectrum. Conclusion Measuring state-of-the-art (ToF-PET) while providing uniform stable readout for multiple same time, treated as candidate integration future ToF-PET systems.