和传统的基于分割晶体PET探测器相比，基于连续晶体的PET探测器具有设计结构简单、能量分辨率高、探测器效率高以及低造价等优点，近年来得到广泛的研究。基于连续晶体PET探测器的最大难点是要用探测器获得闪烁光分布，进而通过作用点定位算法计算γ光子的作用位置。探测器模块电子学需要读出和获取闪烁光的分布，因而电子学变得相对复杂。论文针对自行建立的基于连续LYSO晶体和神经网络定位算法的PET探测器模块的信号读出和数据获取的要求，设计和实现了64通道数据读出和获取电子学系统。该系统采用8片8通道、50 Mbps、串行输出、12 bit ADC对每个通道进行数字化，从海量的核事例中遴选出有效的核事例，在FPGA内实现数据打包、定时符合、基线恢复等功能。经过测试，电路各通道噪声低，增益一致性好。整个电子学系统结构紧凑、性能优良，适合基于连续晶体PET探测器的相关实验研究和应用研究。%Compared with PET detectors basing on the traditional split crystals ,PET detectors basing on continu-ous crystals having a simple structure , high energy resolution and the detector efficiency is high , as well as low cost, etc..The biggest difficulty of the continuous crystal PET detector is using the probe to get the blinking light distribution to calculate the interaction point of the γ-photon by the interaction point position algorithm . The detector module electronics needs to read out and obtain the distribution of the scintillation light , and thus reading out and data acquisition electronics becomes relatively complex .In this paper , we create our own PET detector basing on continuous LYSO crystals and neural network positioning algorithm module , design and real-ize 64 channel data acquisition and readout electronics system .The system uses eight 8-channel, 50Mbps, 12bit ADC for each channel to digitize from the massive nuclear instances for selecting effective examples of nu -clear data and package within the FPGA timing in line , baseline restoration and other functions .After the test , the circuit for each channel has low -noise, gain consistency and compact structure , excellent performance of the entire electronics system , based on the continuous crystal PET detectors , experimental and applied re-search .
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