Multiplexing Readout for Time-of-Flight (TOF) PET Detectors Using Striplines.
Multiplexing Readout for Time-of-Flight (TOF) PET Detectors Using Striplines.
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DOI：
10.1109/trpms.2021.3051364
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发表时间：
2021
影响因子：
4.4
通讯作者：
Chen CT
中科院分区：
文献类型：
--
作者：
Kim H;Kao CM;Hua Y;Xie Q;Chen CT
PET仪器的最新趋势是使用硅光电倍增管（SiPM）进行高分辨率和飞行时间（TOF）检测。由于其小尺寸，PET系统可以使用大量的SiPM，因此有效且可扩展的多路复用读出方法变得重要。不幸的是，复用读出通常会降低TOF所需的快速定时特性，特别是在高通道减少时。在此之前，我们开发了一种基于带状线（SL）的PET读出方法，该方法使用基于时间的多路复用机制。该方法通过设计保持快速定时，并已成功用于TOF PET探测器。在本文中，我们提出了一个更系统的研究，我们研究如何读出的两个重要的设计参数-SL上的输入（nSL）和相邻输入位置之间的路径长度（Δ λ）的数量-影响其检测性能属性的PET。我们的研究结果表明，高达nSL = 32的读出可以实现准确的像素的歧视和引起的能量分辨率的退化很小。的TOF分辨率是温和的妥协和符合的解决时间的顺序为300 ps的半高宽可以实现LYSO和SiPM为基础的探测器。我们还讨论了使用读出的策略，以进一步减少电子通道的数量，否则PET系统将需要。
A recent trend in PET instrumentation is the use of silicon photomultipliers (SiPMs) for high-resolution and time-of-flight (TOF) detection. Due to its small size, a PET system can use a large number of SiPMs and hence effective and scalable multiplexing readout methods become important. Unfortunately, multiplexing readout generally degrades the fast timing properties necessary for TOF, especially at high channel reduction. Previously, we developed a stripline (SL) based readout method for PET that uses a time-based multiplexing mechanism. This method maintains fast timing by design and has been successfully used for TOF PET detectors. In this paper, we present a more systematic study in which we examine how two important design parameters of the readout – the number of inputs on an SL (nSL) and the pathlength between adjacent input positions (Δℓ) – affect its detection performance properties for PET. Our result shows that, up to nSL = 32 the readout can achieve accurate pixel discrimination and causes little degradation in the energy resolution. The TOF resolution is compromised mildly and a coincidence resolving time on the order of 300 ps FWHM can be achieved for LYSO- and SiPM-based detectors. We also discuss strategies in using the readout to further reduce the number of electronic channels that a PET system would otherwise need.