Minimizing Power Consumption for Time-of-Flight PET SiPM Readout

Good energy and timing resolutions are critical parameters for new generations of PET detectors. In particular, implementing detectors with minimum electronics, potentially only passive components, is desired. This will improve the cost but, more importantly, the power consumption of the final scanner, which will further reduce requirements for cooling and space. In this work, we benchmark four circuit configurations with low power consumption. The tests were carried out using 3x3x5 mm ³ LYSO:Ce:Ca crystals and FBK NUV SiPM. The best scenarios provide a combination of 7% energy resolution and 91 ps CTR with the cost of 300 mW power consumption per detector, with two channels, and 115.1 ps and 12% energy resolution for a circuit without active components and a virtual zero power consumption, with one channel. We will further develop these solutions into system-level arrays with deployment potential.