TY - GEN
T1 - Capacitor based multiplexing circuit for silicon photomultiplier array readout
AU - Sun, Xishan
AU - Lou, Kai
AU - Shao, Yiping
N1 - Publisher Copyright:
© 2014 IEEE.
Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 2016/3/10
Y1 - 2016/3/10
N2 - Several different multiplexing readout methods have been investigated for reading out silicon photomultiplier (SiPM) arrays. However, it is still challenging by using these methods to maintain signal integrity for overall good signal and imaging performance while reducing the number of readout and processing channels. One common issue to resistor based multiplexing method is the position-dependent timing shift among different channels, which can in principle be calibrated and corrected but add complexity to the detector calibration and operation process, and can be very difficult to apply for a practical PET system for routine imaging applications. To solve such and other problems, we explored a capacitor-based multiplexing method for our PET detector to read SiPM with a common cathode which has not been addressed previously. To achieve good detector performance, we required output signal without undershot/overshot suited for excellent charge integration, and without timing shift among different channels. The design applies a capacitor network to divide the charge of signals from a SiPM into two branches, with the division of charge based on the position of the SiPM in the network. Only one capacitor value is needed. The number of readout channels can be reduced from N×N to 2N. Evaluation circuit was tested with pulsed signals and a practical PET detector which consisted of an 8×8 SiPM array and LYSO scintillator array. The results showed that signal rise and fall times from different channels were the similar, no output signal undershot, and no timing shift among different channels. The resistive and capacitive multiplexing methods were compared for their noise level, energy resolution, rise time, and timing resolution as function of channel numbers. Capacitive multiplexing method shows better noise and timing performance with much better timing and energy consistent from all detector area. A PCB circuit board with capacitor multiplexing has been developed for PET detector applications.
AB - Several different multiplexing readout methods have been investigated for reading out silicon photomultiplier (SiPM) arrays. However, it is still challenging by using these methods to maintain signal integrity for overall good signal and imaging performance while reducing the number of readout and processing channels. One common issue to resistor based multiplexing method is the position-dependent timing shift among different channels, which can in principle be calibrated and corrected but add complexity to the detector calibration and operation process, and can be very difficult to apply for a practical PET system for routine imaging applications. To solve such and other problems, we explored a capacitor-based multiplexing method for our PET detector to read SiPM with a common cathode which has not been addressed previously. To achieve good detector performance, we required output signal without undershot/overshot suited for excellent charge integration, and without timing shift among different channels. The design applies a capacitor network to divide the charge of signals from a SiPM into two branches, with the division of charge based on the position of the SiPM in the network. Only one capacitor value is needed. The number of readout channels can be reduced from N×N to 2N. Evaluation circuit was tested with pulsed signals and a practical PET detector which consisted of an 8×8 SiPM array and LYSO scintillator array. The results showed that signal rise and fall times from different channels were the similar, no output signal undershot, and no timing shift among different channels. The resistive and capacitive multiplexing methods were compared for their noise level, energy resolution, rise time, and timing resolution as function of channel numbers. Capacitive multiplexing method shows better noise and timing performance with much better timing and energy consistent from all detector area. A PCB circuit board with capacitor multiplexing has been developed for PET detector applications.
UR - http://www.scopus.com/inward/record.url?scp=84965043316&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84965043316&partnerID=8YFLogxK
U2 - 10.1109/NSSMIC.2014.7431219
DO - 10.1109/NSSMIC.2014.7431219
M3 - Conference contribution
AN - SCOPUS:84965043316
T3 - 2014 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014
BT - 2014 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014
Y2 - 8 November 2014 through 15 November 2014
ER -