Threshold Optimization in Multi-Voltage Threshold Digitizers for TOF PET detector

: Deng ZZ, Wu HD, Xiong W, Zhao AJ, Han CL, Wu JY, Yang Y, Duan ZW, Xiao P, Tang J, Xie QG

: IEEE Nuclear Science Symposium and Medical Imaging Conference

: 2017

: IEEE Nuclear Science Symposium conference record

: 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference

: 2017 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (NSS/MIC)

: IEEE NUCL SCI CONF R

: 3

: 978-1-5386-2282-7

: 1095-7863

Performance of time pickoff method, such as Leading Edge Discrimination (LED) or Multi-Voltage threshold (MVT) digitization, is particularly sensitive to the threshold setting. Thus, targeting to the time resolving ability, we investigate the choice of threshold in LED and multi-voltage threshold. In this works, we analysis the time spectrum with the entropy concept. Based on the principle of Minimum Entropy (ME), we give the criterion of threshold choice. To evaluate the improvement of our threshold choice, we setup two detectors to test the coincidence time resolution (CTR) for different threshold setting. The results show better coincidence time resolution could be obtained when the pickoff logic works with the optimized threshold.