Fig. 4
From: Evaluation of the PETsys TOFPET2 ASIC in multi-channel coincidence experiments
Spread in gain for 128 ASIC channels coupled to SiPM arrays. 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 for different SiPM types. b Position of the 1275-keV peak in the energy value spectrum. Measurements were conducted using 110 µm BaSO4 as segmentation layer and SiPM arrays from Broadcom, KETEK, SensL, and Hamamatsu. c Position of the 511-keV peak in the energy value spectrum for different segmentation layers. d Position of the 1275-keV peak in the energy value spectrum for different segmentation layers. Measurements were conducted with two KETEK PA3325-WB-0808 SiPM arrays. All positions are plotted against the applied offset-corrected overvoltage \(\mathsf {U_{ov\_cor}}\)