Speaker
Mr
Ming Niu
(Huazhong University of Science and Technology)
Description
• The SiPM has compact size, high photon detection efficiency (PDE), fast timing response, that makes SiPMs promising in positron emission tomography (PET) imaging. The SiPM-array, which is considered as a position sensitivity photodetector, has potential to replace PSPMT in certain applications. The PET detector which consists of SiPM-arrays is greatly attractive. However, it brings in the multi-channel readout problem at the same time. In this paper, we evaluate three multi-channel readout circuits with the position profile and energy resolution. The three circuits are evaluated with a SiPM-array based small animal detector module, the module is consist of 2×2 LYSO crystal blocks optical coupled to 2×2 SiPM-Array (Sensl SPMArray4), each LYSO block is made up of 4×4 LYSO crystal (3×3×10 mm3). Independent channel readout allows for a better discrimination of inter-crystal-scatter, energy resolution and count rates. However, such an implement brings huge number of readout channels. In this work, the Anger circuit, the discretized proportional counter (DPC) circuit and the cross-wire circuit are evaluated to reduce the number of readout channels from 64 to 16. The cross-wire circuit, as a new readout circuit, requires the least resistors, hence having the lowest power consumption and resistor thermal noise. Instead of only using anode signals, the cathode and anode signals of one SiPM channel will be detected simultaneously in this circuit. So, there is more information we can use than other anode circuits. In the process of evaluation, the scintillator identification accuracy in position profile will be compared for each circuit. The influencing factor of the identification accuracy, including the crystals interaction scatter and the crosstalk of SiPM-arrays, will be deeply investigated in the paper. Simultaneously, we also evaluate the average energy resolution of the detector module with readout circuits. It is deteriorated by the summation of the leakage current and electronic crosstalk from the SiPM-array. It gets worse from 15% to 28% in the DPC circuit. Our results show that DPC circuit has a good position profile and tolerable energy resolution, the cross-wire circuit has some potential for position and energy determination. In the future, the cross-wire circuit will be investigated and optimized.
Author
Mr
Ming Niu
(Huazhong University of Science and Technology)
Co-authors
Mr
Daoming Xi
(Huazhong University of Science and Technology)
Mr
Jun Zhu
(Huazhong University of Science and Technology)
Mr
Lin Li
(Huazhong University of Science and Technology)
Mr
Ming Xie
(Huazhong University of Science and Technology)
Prof.
Peng Xiao
(Huazhong University of Science and Technology)
Prof.
qingguo Xie
(Huazhong University of Science and Technology)
