DOI- and TOF-Capable PET Array Detector Using Double-Ended Light Readout and Stripline-Based Row and Column Electronic Readout

IF 4.6 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING IEEE Transactions on Radiation and Plasma Medical Sciences Pub Date : 2024-01-31 DOI:10.1109/TRPMS.2024.3360942
Fei Wang;Chien-Min Kao;Xiaoyu Zhang;Linfeng Liu;Yuexuan Hua;Heejong Kim;Woon-Seng Choong;Qingguo Xie
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Abstract

We investigate a highly multiplexing readout for depth-of-interaction (DOI) and time-of-flight PET detector consisting of an $N\times N$ crystals whose light outputs at the front and back ends are detected by using silicon photomultipliers (SiPMs). The front $N\times N$ SiPM array is read by using a stripline (SL) configured to support discrimination of the row position of the signal-producing crystal. The back $N\times N$ SiPM array is similarly read by an SL for column discrimination. Hence, the detector has only four outputs. We built $4\times4$ and $8\times8$ detector modules (DMs) by using 3.0-mm $^{3}\,\,\times3.0$ -mm $^{3}\,\,\times20$ -mm3 lutetium-yttrium oxyorthosilicates. The outputs were sampled and processed offline. For both DMs, crystal discrimination was successful. For the 4 $\times $ 4 DM, we obtained an average energy resolution (ER) of 14.1%, an average DOI resolution of 2.5 mm, a non DOI-corrected coincidence resolving time (CRT), measured in coincidence with a single-pixel reference detector (refDet), of about 495ps. For the 8 $\times $ 8 DM, the average ER, average DOI resolution and average CRT were 16.4%, 2.9 mm, and 641ps, respectively. We identified the intercrystal scattering as a probable cause for the CRT deterioration when the DM was increased from 4 $\times $ 4 to 8 $\times $ 8.
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利用双端光读出和基于条带的行列电子读出,可实现 DOI 和 TOF 功能的 PET 阵列探测器
我们研究了一种用于交互深度(DOI)和飞行时间 PET 检测器的高复用读出装置,该装置由 N 次 N 元晶体组成,其前后端的光输出通过硅光电倍增管(SiPM)进行检测。前端 N 次 N 个硅光电倍增管阵列通过使用条纹线(SL)读取,条纹线的配置支持对产生信号的晶体的行位置进行区分。后面的 N/times N$ SiPM 阵列同样也是通过一个 SL 来读取,以进行列分辨。因此,检测器只有四个输出。我们使用 3.0mm $^{3}\\times3.0$ -mm $^{3}\\times20$ -mm3 镥钇氧硅酸盐制造了 $4\times4$ 和 $8\times8$ 的探测器模块(DM)。对输出结果进行了采样和离线处理。对于两种 DM,晶体辨别都很成功。对于 4 倍的 4 DM,我们获得的平均能量分辨率(ER)为 14.1%,平均 DOI 分辨率为 2.5 mm,非 DOI 校正的重合分辨时间(CRT)(与单像素参考探测器(refDet)重合测量)约为 495ps。对于 8 $\times $ 8 DM,平均 ER、平均 DOI 分辨率和平均 CRT 分别为 16.4%、2.9 mm 和 641ps。当DM从4乘以4增加到8乘以8时,我们发现晶间散射可能是CRT恶化的原因。
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来源期刊
IEEE Transactions on Radiation and Plasma Medical Sciences
IEEE Transactions on Radiation and Plasma Medical Sciences RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
8.00
自引率
18.20%
发文量
109
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