Fig. 5
From: Evaluation of the PETsys TOFPET2 ASIC in multi-channel coincidence experiments
Uniform channel performance. A geometry of five NEMA cubes (22Na sources) with a total activity of approximately 3 MBq is employed. a Position of the 511-keV peak in the energy value spectrum. b Position of the 1275-keV peak in the energy value. c Coincidence resolution time (CRT) computed as the mean of the CRTs of this channel with all its coincident channels. d Energy resolution (dE/E). Measurements were conducted with two Hamamatsu S14161-350-HS-08 SiPM arrays at 4 V overvoltage and vth_t1=50. BaSO4 powder (360 µm) mixed with an epoxy was used as segmentation layer. The scintillator array used consists of 8 × 8 needles with a size of 3 mm × 3 mm × 12 mm