基于SiPM侧面读出双层半连续晶体的深度测量PET探测器

赵斌清; 黄宇; 王采林

doi:10.7538/yzk.2023.youxian.0283

基于SiPM侧面读出双层半连续晶体的深度测量PET探测器

松山湖材料实验室,广东东莞523808

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- 刊出日期: 2023-09-19

Depth Encoding PET Detector Using Side Readout of Dual-layer Semi-continuous Crystals with SiPM Array

Songshan Lake Materials Laboratory, Dongguan 523808, China

摘要

摘要: 全身PET成像仪器的发展趋势之一是提高轴向视野，但探测器深度不确定效应对PET仪器空间分辨率的影响随着轴向视野的提高而增加。因此，需研发具有深度测量能力的PET探测器。本文提出了一种采用SiPM阵列侧面读出衰减时间不同的双层半连续晶体的深度测量PET探测器方法，探测器上层是1×4的LYSO晶体阵列，下层是1×4的YSO晶体阵列，每层每根晶体尺寸均为3 mm×6 mm×18 mm。每层单根晶体采用ESR反射膜粘贴，上、下两层晶体通过光学胶耦合。对该探测器性能的实验测量结果表明，探测器可有效区分双层晶体，清晰分辨所有晶体单元。对于上、下两层晶体阵列，平均能量分辨率分别是11.9%和11.7%。探测器对晶体的最佳位置分辨是0.27 mm（FWHM），相比传统端面读出晶体的探测器，此探测器能提供连续深度信息。实验结果表明，本文提出的新型PET探测器可用于实现高性能全身和全景PET扫描仪。
- PET探测器 ,
- 深度测量 ,
- 侧面读出 ,
- 双层半连续晶体阵列
Abstract: One trend in current whole-body PET scanner development is to increase the axial field-of-view. But the degradation of the spatial resolution of PET scanners due to depth of interaction uncertainty increases as the axial field-of-view increases. PET detector with depth encoding capability has become essential. In this work, a depth encoding PET detector using the side readout of duallayer semi-continuous crystals with the SiPM array was proposed. The upper layer of the detector is a fast 1×4 LYSO array, and the lower layer is a 1×4 YSO array. The size of each crystal in each layer is 3 mm×6 mm×18 mm. The crystals of each layer were separated by an ESR reflection film, and the crystal array of the upper and lower layers were coupled by optical glue. The experimental results show that the detector can effectively identify the two layer and all crystals can be clearly resolved from the flood histograms. For the upper and lower crystal array, the average energy resolution is 11.9% and 11.7%, respectively. The detector has a good position resolution of 0.27 mm (FWHM) for the crystals. The crystal resolution map can clearly distinguish all crystal units and provide continuous depth information in the z direction. The signal maximum and sum ratio method was used to analyze the y direction height position, and the upper LYSO crystal layer is better than the lower YSO crystal layer. The experimental results reveal that the novel PET detector proposed here can be used to achieve high-performance whole-body and panoramic PET scanners.
- PET detector ,
- depth encoding ,
- side readout ,
- dual-layer semi-continuous crystal array

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参考文献(14)

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基于SiPM侧面读出双层半连续晶体的深度测量PET探测器

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出版历程

Depth Encoding PET Detector Using Side Readout of Dual-layer Semi-continuous Crystals with SiPM Array

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出版历程

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