A pre-clinical PET scanner based on a monolithic annulus of scintillator (AnnPET): construction and NU4-2008 performance testing.

IF 3.3 3区 医学 Q2 ENGINEERING, BIOMEDICAL
Raymond R Raylman, Alexander V Stolin, Gangadhar Jaliparthi, Peter F Martone
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Abstract

Objective.In the past several decades, numerous positron emission tomography (PET) scanners of various designs have been constructed for use in pre-clinical studies. Our group is investigating use of a monolithic annulus of scintillator, instead of the traditional arrays of discrete scintillator elements or individual detectors that utilize continuous blocks of scintillator, to construct a novel pre-clinical PET scanner.Approach.This scanner, called AnnPET, is based on a fourteen-faceted annulus of lutetium yttrium orthosilicate with an inner diameter of 6 cm and length of 7.2 cm. Each facet is populated with four specially constructed 4 × 4 arrays of 4 mm × 4 mm multi-pixel photon counters .To cool and temperature stabilize these devices, the scanner gantry is immersed in dielectric fluid. Positioning of events in the scintillator is accomplished with the application of deep-residual convolutional neural network. The scanner's performance was assessed using the NEMA NU4-2008 protocols.Results.Full-width-at-half-maximum (FWHM) of the images of a point source reconstructed with the single slice rebinned filtered backprojection (SSRB-FBP) algorithm at 5 mm from the center of the scanner are: 1.40 mm (radial), 1.38 mm (tangential) and 1.40 mm (axial). At 18 mm from scanner center (edge of the scanner's inner bore) the FWHMs are: 1.62 mm (radial), 1.43 mm (tangential) and 1.48 mm (axial) FWHM. Peak detection sensitivity is 9.5% (0.086 cps Bq-1). Peak noise equivalent count rate is 234 kcps at 14.4 MBq.Significance.Overall, testing of the AnnPET system demonstrated very promising performance results for a pre-clinical PET scanner based on a single, cooled annulus of monolithic scintillator used with neural networks. Continued development of the system is planned.

基于单片环形闪烁体(AnnPET)的临床前PET扫描仪:构建和NU4-2008性能测试。
目的:在过去的几十年里,许多不同设计的PET扫描仪已经被建造用于临床前研究。我们的团队正在研究使用单片环形闪烁体,而不是传统的离散闪烁体元素阵列或使用连续闪烁体块的单个探测器,来构建一种新型的临床前PET扫描仪。方法:这台扫描仪被称为AnnPET,是基于一个14面LYSO环,内径6厘米,长7.2厘米。每个面都填充了四个特别构造的4个4个4毫米4毫米MPPCs阵列。为了冷却和稳定这些设备的温度,扫描器的门架被浸在介电流体中。利用深度残差卷积神经网络实现闪烁体中事件的定位。使用NEMA NU4-2008协议评估扫描仪的性能。结果:在距离扫描仪中心5 mm处,单片重滤波反投影(SSRB-FBP)算法重建的点光源图像的半最大全宽度(FWHM)分别为:1.40 mm(径向)、1.38 mm(切向)和1.40 mm(轴向)。在距离扫描仪中心(扫描仪内孔边缘)18 mm处,FWHM分别为:1.62 mm(径向)、1.43 mm(切向)和1.48 mm(轴向)(FWHM)。峰值检测灵敏度为9.5% (0.086 cps/Bq)。在14.4 MBq时,峰值噪声等效计数率(NECR)为234 kcps。意义:总的来说,AnnPET系统的测试显示了非常有希望的临床前PET扫描仪的性能结果,该扫描仪基于单个冷却的单片闪烁体环与神经网络一起使用。计划继续开发该系统。& # xD。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Physics in medicine and biology
Physics in medicine and biology 医学-工程:生物医学
CiteScore
6.50
自引率
14.30%
发文量
409
审稿时长
2 months
期刊介绍: The development and application of theoretical, computational and experimental physics to medicine, physiology and biology. Topics covered are: therapy physics (including ionizing and non-ionizing radiation); biomedical imaging (e.g. x-ray, magnetic resonance, ultrasound, optical and nuclear imaging); image-guided interventions; image reconstruction and analysis (including kinetic modelling); artificial intelligence in biomedical physics and analysis; nanoparticles in imaging and therapy; radiobiology; radiation protection and patient dose monitoring; radiation dosimetry
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