A performance comparison of LFS and LYSO scintillators for TOF PET
A performance comparison of LFS and LYSO scintillators for TOF PET
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DOI：
10.1109/nssmic.2015.7582020
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发表时间：
2015-10
期刊：
影响因子：
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通讯作者：
Heejong Kim;W. Choong;N. Eclov;F. Abu-Nimeh;Chin-Tu Chen;C. Kao
中科院分区：
文献类型：
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作者：
Heejong Kim;W. Choong;N. Eclov;F. Abu-Nimeh;Chin-Tu Chen;C. Kao
闪烁体是决定PET探测器整体性能的重要部件，为了获得更好的性能，对闪烁体提出了更高的要求，特别是对TOF PET扫描仪。最近，有几个关于微硅酸(LFS)[4]闪烁体的报道[1][2][3]表明它比TOF PET常用的LSO(LSO)闪烁体具有更好的时间和能量分辨率。除了LFS优越的时间性能外，在使用15 mm LFS闪烁体的情况下，还分别在[2]和[3]中报告了出色的时间分辨率，例如96ps和148ps fwm。我们对LFS和LYSO闪烁体进行了性能比较，从实验上验证了报道的结果。在我们的研究中，使用高速波形采样数字化仪DRS4[5]进行信号读出，以精确地测量探测器的事件时间，测得DRS4读出的电子时间分辨率为~5ps fwm[6]。为了研究闪烁体对计时性能的影响，我们对三种不同长度的闪烁体进行了测试。给出了511keV衰变时间、时间和能量分辨的一些初步结果。
Scintillator is an important component which determines the overall performances of PET detectors, and scintillators with fast timing in addition to high light yield are required to achieve better performances, especially for TOF PET scanners. Recently, there have been several reports [1] [2] [3] on Lutetium Fine Silicate (LFS) [4] scintillator showing its improved timing and energy resolution than LYSO (LSO), which has been commonly used for TOF PET. In addition to the superior timing performance of LFS, excellent time resolution, e.g., 96 and 148 ps fwhm, were reported in [2] and [3], respectively, by using 15 mm LFS scintillator. We have carried out a performance comparison between LFS and LYSO scintillator to check the reported results experimentally. In our study, a high-speed waveform sampling digitizer, DRS4 [5], is used for signal readout to measure the event time of the detectors precisely; the electronic time resolution of the DRS4 readout is measured to be ~5 ps fwhm [6]. To investigate the effects on the timing performances, scintillators with three different length are tested in our study. Some preliminary results on decay time, time and energy resolution at 511 keV are presented here.