Development of a Multi-Pixel Photon Counter Module for Positron Emission Tomography
Development of a Multi-Pixel Photon Counter Module for Positron Emission Tomography
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DOI：
10.1109/tns.2013.2251657
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发表时间：
2013-06-01
影响因子：
1.8
通讯作者：
Omura, T.
中科院分区：
文献类型：
--
作者：
Shimizu, K.;Uchida, H.;Omura, T.
研制了一种新的多像素光子计数器（MPPC）正电子发射断层成像探测器模块。使用8 x 8 MPPC阵列的检测区域为40 mm x 40 mm。每个MPPC的有效面积为3 mm x 3 mm。探测器模块包含前置放大器、用于设置偏置偏移的数模转换器、用于位置编码的2D电阻网络、高压模块、温度传感器和嵌入式微处理器单元。由于MPPC增益取决于温度，因此通过改变偏置电压来执行补偿。采集并检查了8 x 8阵列（间距为5 mm）和32 x 32（间距为1.25 mm）阵列的两种泛光图像。评价了时间分辨率和暗计数的影响。使用由耦合到PMT的BaF2晶体组成的参考检测器，当单个5 mm x 5 mm x 20 mm LYSO闪烁体耦合到一个MPPC通道时，定时分辨率为354 ps。然而，由于暗计数的增加，阵列的时间分辨率变差。
A new detector module for positron emission tomography using multi-pixel photon counters (MPPCs) was developed. The detection area is 40 mm x 40 mm using an 8 x 8 MPPC array. The active area of each MPPC is 3 mm x 3 mm. The detector module contains preamplifiers, digital-to-analog converters for setting the bias offset, a 2D resistor network for position encoding, a high-voltage module, a temperature sensor, and embedded microprocessor units. Since the MPPC gain depends on temperature, compensation was performed by varying the bias voltage. Two kinds of flood images of an 8 x 8 array (5-mm pitch) and a 32 x 32 (1.25-mm pitch) array were acquired and examined. The timing resolution and the effect of dark counts were evaluated. With a reference detector consisting of a BaF2 crystal coupled to a PMT, the timing resolution was 354 ps when a single 5 mm x 5 mm x 20 mm LYSO scintillator was coupled to one MPPC channel. However, the time resolution of the array deteriorated because of the increase in dark counts.