Performance Comparison of DOI-Encoding PET Detectors Based on 1.1-mm Pitch BGO Arrays With Different Reflectors

IF 4.6 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING IEEE Transactions on Radiation and Plasma Medical Sciences Pub Date : 2024-02-05 DOI:10.1109/TRPMS.2024.3361891
Junwei Du;Shixian Du
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Abstract

Bismuth germanate (BGO)-based positron emission tomography (PET) detectors are potential candidates for low-dose imaging PET scanners, owing to the high stopping power and low background radiation of BGO. In this article, we compared the performance of two dual-ended readout PET detectors based on $15\times15$ BGO arrays. Both arrays had the same 1.1 mm pitch but utilized different reflectors—barium sulfate (BaSO4) and enhanced specular reflector film (ESR)—for high-resolution PET applications. The detectors were constructed with Hamamatsu 13361–2050-08 silicon photomultiplier arrays. Each BGO element had dimensions of $1.02\times 1.02\times20$ mm3. The lateral surfaces of the BGO elements were unpolished (saw-cut), while the two ends were polished. Flood histograms showed that the detector based on the BGO array with BaSO4 reflector had much better crystal identification and depth-of-interaction (DOI) resolution. Specifically, the energy, DOI, and timing resolutions for the detector using the BGO array with BaSO4 reflector were 19.8 ± 1.5%, 4.13 ± 0.48 mm, and 2.80 ± 0.23 ns, respectively. In contrast, the values obtained using the BGO array with ESR reflector were 20.9 ± 2.1%, 7.69 ± 1.92 mm, and 2.93 ± 0.20 ns, respectively.
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基于 1.1 毫米间距 BGO 阵列的 DOI 编码 PET 探测器与不同反射器的性能比较
基于锗酸铋(BGO)的正电子发射断层扫描(PET)探测器是低剂量成像 PET 扫描仪的潜在候选探测器,因为 BGO 具有高阻断能力和低本底辐射。在本文中,我们比较了基于 $15\times15$ BGO 阵列的两种双端读出 PET 探测器的性能。这两种阵列具有相同的 1.1 毫米间距,但使用了不同的反射器--硫酸钡 (BaSO4) 和增强镜面反射膜 (ESR)--用于高分辨率 PET 应用。探测器采用 Hamamatsu 13361-2050-08 硅光电倍增管阵列。每个 BGO 元件的尺寸为 1.02×times 1.02×times20$ mm3。BGO 元件的侧表面未经抛光(锯切),而两端经过抛光。泛洪直方图显示,基于 BGO 阵列和 BaSO4 反射器的探测器具有更好的晶体识别能力和相互作用深度(DOI)分辨率。具体来说,使用带有 BaSO4 反射器的 BGO 阵列的探测器的能量、DOI 和时间分辨率分别为 19.8 ± 1.5%、4.13 ± 0.48 mm 和 2.80 ± 0.23 ns。相比之下,使用带有 ESR 反射器的 BGO 阵列获得的数值分别为 20.9 ± 2.1%、7.69 ± 1.92 mm 和 2.93 ± 0.20 ns。
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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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