We present an electrical analysis method for a gamma-ray imaging system based on a resistive network readout. Currently, the array numbers of scintillators and detectors in imaging systems are being increased to enhance the spatial resolution, and resistive network-based readout circuits are used to reduce the number of channels. However, a positioning process is required to identify the channel in which the signal has been generated, which causes positional distortion. For position correction, the positioning characteristics must be measured according to the readout circuit conditions. However, due to the scintillator's radiation, measurement in a single channel is difficult. In this work, a current pulse is modeled to analyze the positional characteristics of different channels. A current pulse generator and an automatic channel-selection circuit are designed to input signals selectively to each channel. When the input signal duration is 1 μs, the maximum amount of charge generated by the current pulse generator is approximately 1000 pC. Position errors of up to 88.47% are generated, depending on the gain of the preamplifier. Our proposed method can be used for the linearity analysis of preamplifiers and image position correction algorithms.

中文翻译：

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基于电阻网络读出的伽马射线成像系统电学分析方法


我们提出了一种基于电阻网络读出的伽马射线成像系统的电分析方法。目前，成像系统中闪烁体和探测器的阵列数量正在增加，以提高空间分辨率，并使用基于电阻网络的读出电路来减少通道数量。然而，需要定位过程来识别生成信号的通道，这会导致位置失真。对于位置校正，必须根据读出电路条件测量定位特性。然而，由于闪烁体的辐射，单通道测量很困难。在这项工作中，对电流脉冲进行建模以分析不同通道的位置特征。电流脉冲发生器和自动通道选择电路被设计成选择性地将信号输入到每个通道。当输入信号持续时间为1μs时，电流脉冲发生器产生的最大电荷量约为1000pC。根据前置放大器的增益，会产生高达 88.47% 的位置误差。我们提出的方法可用于前置放大器和图像位置校正算法的线性分析。