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Electronics for a prototype variable field of view PET camera using the PMT-quadrant-sharing detector array

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7 Author(s)
Hongdi Li ; M.D. Anderson Cancer Center, Texas Univ., Houston, TX, USA ; Wai-Hoi Wong ; Nan Zhang ; Junming Wang
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Electronics for a prototype high-resolution PET camera with eight position-sensitive detector modules has been developed. Each module has 16 BGO (Bi4Ge3O12) blocks (each block is composed of 49 crystals). The design goals are component and space reduction. The electronics is composed of five parts: front-end analog processing, digital position decoding, fast timing, coincidence processing and master data acquisition. The front-end analog circuit is a zone-based structure (each zone has 3×3 PMTs). Nine ADCs digitize integration signals of an active zone identified by eight trigger clusters; each cluster is composed of six photomultiplier tubes (PMTs). A trigger corresponding to a gamma ray is sent to a fast timing board to obtain a time-mark, and the nine digitized signals are passed to the position decoding board, where a real block (four PMTs) can be picked out from the zone for position decoding. Lookup tables are used for energy discrimination and to identify the gamma-hit crystal location. The coincidence board opens a 70-ns initial timing window, followed by two 20-ns true/accidental time-mark lookup table windows. The data output from the coincidence board can be acquired either in sinogram mode or in list mode with a Motorola/IRONICS VME-based system

Published in:

Nuclear Science, IEEE Transactions on  (Volume:46 ,  Issue: 3 )

Date of Publication:

Jun 1999

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