The data acquisition system of ClearPET neuro - a small animal PET scanner
The data acquisition system of ClearPET neuro - a small animal PET scanner
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DOI：
10.1109/tns.2006.875051
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发表时间：
2006-06-01
影响因子：
1.8
通讯作者：
Ziemons, K
中科院分区：
文献类型：
--
作者：
Streun, M;Brandenburg, G;Ziemons, K
Crystal Clear合作开发了一种用于小动物PET扫描仪(ClearPET)的模块化系统。这种模块化允许组装不同尺寸和特性的扫描仪，以满足各个成员机构的特定需求。该系统通过将LSO和LuYAP闪烁体耦合到多通道光电倍增管(PMT)的光学夹层布置来执行交互深度检测。对于每个光电倍增管，一个自由运行的40 MHz模数转换器将信号数字化，完整的闪烁脉冲由现场可编程门阵列采样，并以20MB/S的速度送到PC机进行预处理。该脉冲提供了关于伽马能量和闪烁体材料的信息，该信息标识了相互作用层。此外，还可以从采样数据中获得准确的脉冲起始时间。这一点很重要，因为没有实现硬件符合检测。所有单次事件都被记录下来，并通过软件识别重合。吉利奇(ClearPET Neuro)的系统在80个PMT上配备了10140个晶体。本文将对数据采集系统进行概述。
The Crystal Clear Collaboration has developed a modular system for a small animal PET scanner (ClearPET). The modularity allows the assembly of scanners of different sizes and characteristics in order to satisfy the specific needs of the individual member institutions.The system performs depth of interaction detection by using a phoswich arrangement combining LSO and LuYAP scintillators which are coupled to Multichannel Photomultipliers (PMTs). For each PMT a free running 40 MHz ADC digitizes the signal and the complete scintillation pulse is sampled by an FPGA and sent with 20 MB/s to a PC for preprocessing. The pulse provides information about the gamma energy and the scintillator material which identifies the interaction layer. Furthermore, the exact pulse starting time is obtained from the sampled data. This is important as no hardware coincidence detection is implemented. All single events are recorded and coincidences are identified by software.The system in Jiilich (ClearPET Neuro) is equipped with 10140 crystals on 80 PMTs. The paper will present an overview of the data acquisition system.