多阳极位置灵敏光电倍增管位置读出电路的设计实现
Design and Implementation of Simplified Readout Circuits for Multi-anode Position-sensitive Photomultiplier Tubes
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摘要: 多阳极位置灵敏光电倍增管(PSPMT)被广泛地用来开发高分辨的小型γ相机模块.探讨了PSPMT、的位置读出电路的简化设计研究,并针对日本滨松的H8500型多阳极PSPMT,设计和开发了离散位置读出电路(DPC)和均衡电荷分配电路(SCDC)两种简化的位置读出电路,并在SCDC中加入了局域重心(TCOG)的定位方法,进一步地优化读出电路的简化设计.初步的实验测试结果表明,SCDC结合TCOG定位法,能显著地改善探测器的定位非线性及压缩效应,扩展有效的成像视野(FOV),比DPC方法的有效视野增大了约20%.Abstract: The multi-anode position sensitive photomultiplier tube(PSPMT)has been used for the development of high-resolution γ camera module.This study is aimed to investigate the simplified readout design for the multi-anode flat panel PSPMT.Based on the Hamamatsu H8500 PSPMT with 64 multi-anodes,we designed and developed two simplified readout circuits,discretized positioning circuit(DPC)and symmetric charge division circuit(SCDC).The truncated center-of-gravity(TCOG)positioning method was used to optimize the readout signal processing and then further reduce the readout channels by a resistor chain.The preliminary results show that the SCDC readout with the TCOG could significantly reduce the non-linearity of positioning and improve the effective field-of-view of the detector by about 20% as compared to the DPC readout.
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