A PET system with free running ADCs
A PET system with free running ADCs
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DOI：
10.1016/s0168-9002(02)00669-1
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发表时间：
2002-06-21
影响因子：
1.4
通讯作者：
Halling, H
中科院分区：
文献类型：
--
作者：
Streun, M;Brandenburg, G;Halling, H
一个小型 PET 系统由两个多通道光电倍增管组成，每个光电倍增管连接到由 64 个单 LSO 晶体组成的矩阵。来自每个乘法器的信号由 12 位 ADC 以 40 MHz 的采样频率连续采样。在闪烁脉冲的情况下，后续 FPGA 将相应的样本集连同通道信息和时间标记一起发送到主机，数据传输以 20 MB/s 的速率执行。在主机上，所有必要的信息都从数据中提取。确定脉冲能量，检测同时发生的事件，并且可以识别一个矩阵内的多个命中。为了实现窄时间窗口，脉冲起始时间比时间标记的分辨率（= 25ns）更精细。这可以通过在脉冲样本之间进行插值来实现。将展示从该系统获得的第一批数据。该系统是一个更大系统开发的一部分，旨在研究该技术和硬件架构的可行性和性能。 (C) 2002 Elsevier Science B.V. 保留所有权利。
A small PET system has been built up with two multichannel photomultipliers, which are attached to a matrix of 64 single LSO crystals each. The signal from each multiplier is being sampled continuously by a 12 bit ADC at a sampling frequency of 40 MHz. In case of a scintillation pulse a subsequent FPGA sends the corresponding set of samples together with the channel information and a time mark to the host computer, The data transfer is performed with a rate of 20 MB/s. On the host all necessary information is extracted from the data. The pulse energy is determined, coincident events are detected and multiple hits within one matrix can be identified. In order to achieve a narrow time window the pulse starting time is refined further than the resolution of the time mark (=25ns) would allow. This is possible by interpolating between the pulse samples. First data obtained from this system will be presented. The system is part of developments for a much larger system and has been created to study the feasibility and performance of the technique and the hardware architecture. (C) 2002 Elsevier Science B.V. All rights reserved.