FRONT END ELECTRONICS FOR A VARIABLE FIELD PET CAMERA USING THE PMT-QUADRANT-SHARING DETECTOR ARRAY DESIGN *
FRONT END ELECTRONICS FOR A VARIABLE FIELD PET CAMERA USING THE PMT-QUADRANT-SHARING DETECTOR ARRAY DESIGN *
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使用 PMT 象限共享探测器阵列设计的可变视场宠物相机的前端电子器件*
DOI：
10.1109/23.597003
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发表时间：
1996
影响因子：
--
通讯作者：
S. Yokoyama
中科院分区：
文献类型：
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作者：
W. Wong;Guoji Hu;N. Zhang;J. Uribe;Junming Wang;Hongdi Li;WeiZhao Lu;H. Baghaei;S. Yokoyama
这是针对 PET 相机的电子设计，具有 8 个位置敏感探测器阵列。每个阵列有 16 个 BGO 块（每个块由 49 个晶体组成）。设计目标是减少组件和空间。每个 PMT 都有其快速放大器和触发积分器。九个闪存 ADC 服务于由 27 个 PMT 和 784 个晶体组成的阵列。来自一个或多个 PMT 簇的快速信号被求和。快速求和信号经过阈值处理后发送至可编程逻辑，以确定可能的闪烁区（4 个块）并打开相关的 9 个 PMT 积分器。集成后，逻辑还驱动一组超快速模拟开关，将闪存 ADC 组连接到闪烁区中的 PMT 集成通道。 9 个 ADC 输出（具有良好光子统计数据的积分脉冲）被锁存并进行比较。比较器结果确定区域中的哪个块正在触发，并选择适当的 4 个 ADC 并将其连接到位置解码器。解码器输出图像切片地址和晶体地址。该电路采用流水线方式并由 250 MHz 主时钟驱动。电路和随机辐射源的最大事件处理速率为 2/spl times/10/sup 6//sec（具有 10:1 随机性裕量）。
This is an electronic design for a PET camera with 8 arrays of position sensitive detectors. Each array has 16 BGO blocks (each block is composed of 49 crystals). The design goals are component and space reduction. Each PMT has its fast amplifier and triggered integrator. Nine flash ADC serve an array of 27 PMT and 784 crystals. The fast signals from one or more PMT clusters are summed. The fast summed signals are thresholded and sent to a programmable logic to determines the probable scintillation zone (4 blocks) and to turn on the associated 9 PMT integrators. After integration, the logic also drives a set of ultra-fast analog switches to connect the flash ADC set to the PMT integration channels in the scintillation zone. The 9 ADC output (integrated pulses with good photon statistics) are latched and compared. The comparator result determines which block in the zone is firing and the appropriate 4 ADC are selected and bused into a position decoder. The decoder outputs the image-slice address and the crystal address. The circuit is pipelined and driven by a 250 MHz master clock. The maximum event-processing rate for the circuit and a random radiation source is 2/spl times/10/sup 6//sec (with 10:1 randomness allowance).