Evaluation of signal energy calculation methods for a light-sharing SiPM-based PET detector

Evaluation of signal energy calculation methods for a light-sharing SiPM-based PET detector
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基于 SiPM 的光共享 PET 探测器信号能量计算方法的评估

DOI:
10.1016/j.nima.2016.12.035
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发表时间:
2017-03
期刊:
Nuclear Instruments and Methods in Physics Research Section A
影响因子:
--
通讯作者:
Yu Gu
Yu Gu
中科院分区:
其他
文献类型:
--
作者:
Qingyang Wei;Tianyu Ma;Tianpeng Xu;Yaqiang Liu;Shi Wang;Yu Gu

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光共享正电子发射断层扫描(PET)探测器的信号通常被多路传输到三个模拟脉冲(E、X和Y),然后进行数字采样。从这个过程中,得到了对探测器性能至关重要的信号能量。本文利用均方根(RMS)指标,对自行研制的SiPM基PET探测器的不同信号能量计算策略,包括脉冲高度和不同的积分方法,从能量分辨率和晶体响应在洪水直方图中的扩散进行了评估。结果表明,积分优于脉冲高度。在我们的探测器的这些评估方法中,使用脉冲E的最大导数值作为标志点和28个积分点(448 Ns)的积分具有最好的性能。这种积分方法提高了探测器在能量和位置方面的性能。所提出的方法有望适用于其他共光PET探测器。
Signals of a light-sharing positron emission tomography (PET) detector are commonly multiplexed to three analog pulses (E, X, and Y) and then digitally sampled. From this procedure, the signal energy that are critical to detector performance are obtained. In this paper, different signal energy calculation strategies for a self-developed SiPM-based PET detector, including pulse height and different integration methods, are evaluated in terms of energy resolution and spread of the crystal response in the flood histogram using a root-mean-squared (RMS) index. Results show that integrations outperform the pulse height. Integration using the maximum derivative value of the pulse E as the landmark point and 28 integrated points (448 ns) has the best performance in these evaluated methods for our detector. Detector performance in terms of energy and position is improved with this integration method. The proposed methodology is expected to be applicable for other light-sharing PET detectors.
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