A large area, silicon photomultiplier-based PET detector module.
A large area, silicon photomultiplier-based PET detector module.
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DOI：
10.1016/j.nima.2013.10.008
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发表时间：
2014-01-21
期刊：
影响因子：
--
通讯作者：
Proffitt J
中科院分区：
文献类型：
--
作者：
Raylman R;Stolin A;Majewski S;Proffitt J
硅光电倍增管（SiPM）的引入促进了紧凑、高效和磁场硬化的正电子发射断层扫描（PET）扫描仪的构造。为了充分利用这些设备，需要使用它们来生产大视场PET扫描仪的方法。在这项调查中，我们探讨了技术，联合收割机两个SiPM阵列，形成小动物PET扫描仪的积木。该模块由一个26 × 58阵列的1.5 × 1.5mm2 LYSO元件（跨度41 × 91mm2）耦合到两个SensL SiPM阵列。SiPM是用为该项目开发的新的多路复用电子设备读出的。为了便于用多个SiPM阵列计算事件位置，有必要用小光导在多个元件之间传播闪烁光。该方法成功地允许识别所有探测器元件，即使在两个SiPM阵列之间的接缝处。由于SiPM的性能通过冷却得到增强，因此检测器模块配备了冷却夹套，从而可以控制设备和电子器件的温度。测试表明，当温度从28 °C降低到16 °C时，从闪烁阵列检测到的光的峰谷对比度增加了约45%。511 keV光子的能量分辨率从28 °C的18.8%略微提高到16 °C的17.8%。最后，发现该模块的符合定时分辨率不足以用于飞行时间应用（14 °C时为2100 ps）。这些新模块的首次使用将是用于构建小动物PET扫描仪，该扫描仪将与3T临床磁共振成像扫描仪集成。
The introduction of silicon photomultipliers (SiPM) has facilitated construction of compact, efficient and magnetic field-hardened positron emission tomography (PET) scanners. To take full advantage of these devices, methods for using them to produce large field-of-view PET scanners are needed. In this investigation, we explored techniques to combine two SiPM arrays to form the building block for a small animal PET scanner. The module consists of a 26 × 58 array of 1.5 × 1.5mm2 LYSO elements (spanning 41 × 91mm2) coupled to two SensL SiPM arrays. The SiPMs were read out with new multiplexing electronics developed for this project. To facilitate calculation of event position with multiple SiPM arrays it was necessary to spread scintillation light amongst a number of elements with a small light guide. This method was successful in permitting identification of all detector elements, even at the seam between two SiPM arrays. Since the performance of SiPMs is enhanced by cooling, the detector module was fitted with a cooling jacket, which allowed the temperature of the device and electronics to be controlled. Testing demonstrated that the peak-to-valley contrast ratio of the light detected from the scintillation array was increased by ∼45% when the temperature was reduced from 28 °C to 16 °C. Energy resolution for 511 keV photons improved slightly from 18.8% at 28 °C to 17.8% at 16 °C. Finally, the coincidence timing resolution of the module was found to be insufficient for time-of-flight applications (∼2100 ps at 14 °C). The first use of these new modules will be in the construction of a small animal PET scanner to be integrated with a 3T clinical magnetic resonance imaging scanner.
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发表时间：
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影响因子：
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