Fig. 10

Multi-photon coincidence time resolution of the different SiPM-ASIC channel combinations illuminated with optical photons at 406 nm and at different frequencies. Data were acquired using Broadcom NUV-MT SiPMs and the TOFPET2 ASIC with an ASIC threshold of \(\mathsf {vth\_t1} = 20\). a One SiPM channel coupled to two ASIC channels of the same ASIC. b Two SiPM channels on one SiPM array each coupled to one ASIC channel of the same ASIC. c Comparison between different combinations and readout electronics at an overvoltage of 9 V