Abstract
Recently, we have developed a stripline (SL) readout method and amulti-voltage threshold (MVT) digitizer for PET. The SL readout is amultiplexing method for reading multiple input signals that is easy toimplement and can support timeof-flight (TOF) detection. The MVT methodsdigitally samples a PET signal pulse with respect to a number of voltagethresholds and can be implemented by using the field programmable gate array(FPGA). The use of these two methods can greatly simplify the electroniccomplexity of a TOF PET detector. In this paper, we investigate theperformance properties of the SL readout when applied to different numbersof silicon photomultipliers (SiPM) from SensL. Outputs of the SL readout areacquired by using a 72-ch FPGA MVT board. Our results show that up to 36pixels per SL can be discriminated, a pixel energy resolution of 11-21%can be obtained, and a coincidence resolving time (CRT) of 520 ps can beachieved. Previously, we obtained 320ps CRT when applied the MVT to a singlepixel made of LYSO and SiPM. Therefore, we believe the CRT can be furtherimproved after optimization.
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