Electronic Readout for a 100 ps CTR PET Detector with 24:1 Multiplexing Ratio of Timing Channels

We have designed a novel electronic readout with 24:1 multiplexing ratio of the timing channels that achieves 100 ps coincidence time resolution. The detector layer units comprise 2×4 arrays of 3×3×10 mm ³ "LGSO" crystals side-coupled to 6×4 arrays of 3×3 mm ² SiPMs. To achieve low power dissipation and scalability of this readout design, its effective area is implemented in only 13.3 mm using compact and power efficient electronic components. The measured CTR of the 24:1 multiplexed timing channels (or 8:1 LVDS signals) was 107.0 ± 3.6 ps FWHM using a ²² Na point-source and a very low timing jitter FPGA-based TDC.