A simplified readout circuit for a 2×2 H8500 multi-anode PSPMT array

Authors

Meng Liu, Chinese Academy Of Science
Yujin Qi, University of WollongongFollow
Cuilan Zhao, Graduate University Of Chinese Academy Of Sciences
Xuezhu Zhang, Chinese Academy Of Sciences

RIS ID

79279

Publication Details

Liu, M., Qi, Y., Zhao, C. & Zhang, X. (2010). A simplified readout circuit for a 2×2 H8500 multi-anode PSPMT array. Hejishu, 33 (8), 613-618.

Abstract

This work is aimed at developing a novel simplified readout circuit for 2×2 H8500 multi-anode PSPMT array.The readout scheme is based on two-stage resistive networks with truncated center of gravity(TCOG) positioning method to optimize the detector performance.Test results showed that the readout circuit,which reduces the readout channels from 256 to 4,could well resolve the 1.2 mm crystal elements of the NaI(Tl) crystal array,with maximized effective field-of-view(FOV) of the detector,covering the entire active area of the detector.However,the optical coupling measures in the gap regions between the PSPMTs are necessary,so as to improve image distortion in the gap regions.The results indicate that our design is effective and can be adopted for high-resolution gamma camera with even larger FOV.