Design and evaluation of gapless curved scintillator arrays for simultaneous high-resolution and high-sensitivity brain PET
Design and evaluation of gapless curved scintillator arrays for simultaneous high-resolution and high-sensitivity brain PET
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DOI：
10.1088/1361-6560/ab4e3c
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发表时间：
2019-12-01
影响因子：
3.5
通讯作者：
Cherry, Simon R.
中科院分区：
文献类型：
--
作者：
Du, Junwei;Bai, Xiaowei;Cherry, Simon R.
同时提供跨视场的高分辨率和高灵敏度的脑PET扫描仪可以使用基于SiPM阵列的检测器来构造，所述SiPM阵列耦合到具有精细分段和长检测器元件的闪烁体阵列的两端。为了减少探测器模块之间的死区，从而提高PET扫描器的灵敏度，提出了具有曲面的晶体阵列。在本文中，一个概念验证探测器模块的性能与九个探测器子模块的基础上SiPM耦合到两端的弯曲LYSO阵列与间距大小为1.0？？xfffd;？？一点零？mm（2）的前端和30？mm进行了评价。一个简单的信号复用方法，使用共享的光电探测器读出方法进行了评估，以确定晶体。结果表明，探测器模块中所有感兴趣的LYSO元素都能被清晰分辨。能量分辨率、相互作用深度分辨率和时间分辨率分别为14.6%和14.6%。xfffd;？？3.6%，2.77%，xfffd;？？0.39？mm，1.15？？xfffd;？？0.07 ns，分别在28.0 V的偏置电压和16.8 ℃的温度下获得。xfffd;？？0.2&xfffd;C.
Brain PET scanners that simultaneously provide high-resolution across the field-of-view and high-sensitivity can be constructed using detectors based on SiPM arrays coupled to both ends of scintillator arrays with finely segmented and long detector elements. To reduce the dead space between detector modules and hence improve the sensitivity of PET scanners, crystal arrays with curved surfaces are proposed. In this paper, the performance of a proof-of-concept detector module with nine detector submodules based on SiPMs coupled to both ends of a curved LYSO array with a pitch size of 1.0??& xfffd;??1.0?mm(2) at the front-end and a length of 30?mm was evaluated. A simple signal multiplexing method using the shared-photodetector readout method was evaluated to identify the crystals. The results showed that all the LYSO elements in the detector module of interest could be clearly resolved. The energy resolution, depth-of-interaction resolution, and timing resolution were 14.6%??& xfffd;??3.6%, 2.77??& xfffd;??0.39?mm, and 1.15??& xfffd;??0.07 ns, respectively, obtained at a bias voltage of 28.0 V and a temperature of 16.8 & xfffd;C??& xfffd;??0.2 & xfffd;C.