Electronics for a prototype variable field of view PET camera using the PMT-quadrant-sharing detector array
Electronics for a prototype variable field of view PET camera using the PMT-quadrant-sharing detector array
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使用 PMT 象限共享探测器阵列的可变视场 PET 相机原型电子设备
DOI：
10.1109/nssmic.1998.774380
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
S. Yokoyama
中科院分区：
文献类型：
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作者：
Hongdi Li;W. Wong;N. Zhang;Junming Wang;J. Uribe;H. Baghaei;S. Yokoyama
研制了一台具有8个位置敏感探测器模块的高分辨率PET照相机样机。每个模块有16块BGO（每块由49个晶体组成）。设计目标是减少组件和空间。电子学部分由5个部分组成：前端模拟处理、数字位置解码、快速定时、符合处理和主数据采集。前端模拟电路是基于区域的结构（每个区域具有3/spl倍/3个PMT），具有8个触发器集群（每个集群由6个PMT组成），其生成触发器并识别将由9个ADC数字化的活动区域。触发器被发送到快速定时板以获得时间标记，并且9个数字化信号被传递到位置解码板，在位置解码板处，可以从区域中挑选出真实的块（4个PMT）用于位置解码。可编程逻辑器件用于能量鉴别和识别伽马击中晶体位置。符合板打开一个70 ns的初始定时窗口，随后是两个20 ns的数字符合时标查找表窗口，以识别真实事件和偶然事件。从符合板输出的数据可以在正弦图模式或列表模式下使用基于Motorola/IRONICS VME的系统采集。
The electronics for a prototype high resolution PET camera with 8 modules of position sensitive detectors has been developed. Each module has 16 BGO blocks (each block is composed of 49 crystals). The design goals are component and space reduction. The electronics is composed of 5 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/spl times/3 PMTs) with 8 trigger clusters (each cluster is composed of 6 PMTs) generating a trigger and identifying an active zone to be digitized by 9 ADCs. The trigger is sent to a fast timing board to get a time mark, and the 9 digitized signals are passed to the position decoding board, where a real block (4 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 digital coincidence time mark look up table windows, to identify the true and accidental events. 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.