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Investigation of low noise, low cost readout electronics for high sensitivity PET systems based on Avalanche Photodiode arrays

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2 Author(s)
Habte, F. ; Sch. of Medicine, Univ. of California, San Diego, CA, USA ; Levin, C.S.

A compact, low noise and low cost readout system based on commercially available application-specific integrated circuits (ASICs) is under investigation. These front-end circuits have been used to readout a prototype detector module comprising Lutetium Oxyorthosilicate (LSO) scintillation crystals coupled to avalanche photodiode (APD) arrays. A major goal for this work is to build a dedicated high performance breast imaging PET system. Characteristics of signal response, noise, pedestals and gain of the chip have been evaluated. The channels have a linear response to within 2% across a ±75 fC dynamic range and have an intrinsic 120 e-rms noise level in each channel. The chips allow hardware adjustment of bias levels to allow gain uniformity of less than 5% for all channels within a chip. Initial tests of the chip when connected to a prototype APD array also showed good performance. 13% energy resolution was obtained with direct 5.9 keV X-ray interactions in a single APD pixel. The gain performance is very stable over all channels. Initial performance evaluation indicates that the chip has good performance and may be used as front-end electronics for the proposed PET system.

Published in:

Nuclear Science Symposium Conference Record, 2002 IEEE  (Volume:2 )

Date of Conference:

10-16 Nov. 2002