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用异构结构闪器进行正电子发射断层扫描的图像重建分析

Philipp Mohr¹, Nikos Efthimiou², Fiammetta Pagano³

¹Factuly of Chemistry and Biotechnology, FH Aachen University of Applied Sciences, 52428 Jülich, Germany, and also with the Experimental Physics Department, European Organization for Nuclear Research (CERN), 1201 Geneva, Switzerland. He is now with the Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands.

IEEE transactions on radiation and plasma medical sciences

|July 3, 2023

概括

辐射探测器中的结构工程提高了性能. 在飞行时间的正子发射断层扫描 (TOF-PET) 中,异构结构的闪光器显示出更好的定时分辨率,尽管灵敏度降低,但对于先进的成像至关重要.

科学领域:

医学物理医学物理
探测器技术探测器技术
材料科学材料科学材料科学

背景情况:

下一代辐射探测器需要提高性能.
结构工程为探测器设计提供了一种新的方法.
飞行时间正子辐射断层扫描 (TOF-PET) 需要精确的计时测量.

研究的目的:

为了研究TOF-PET的异构闪器的性能.
评估多层BGO和塑料闪光灯对探测器定时分辨率和灵敏度的影响.
为复杂的探测器设计开发模拟和重建方法.

主要方法:

蒙特卡洛模拟被用来用异构结构的闪器建模TOF-PET几何.
探测器的时间分辨率是基于BGO和塑料层中沉积和共享的能量计算的.
事件按巧合时间分辨率 (CTR) 分类,用于使用高斯 TOF 内核进行重建.
通过使用NEMA IQ幻影来评估表现.

主要成果:

不同结构的闪器改善了CTR,达到204 ± 49 psi (100μm塑料) 和220 ± 41 ps (50μm塑料),相比之下,散装BGO的276 ps.
较薄的塑料层降低了灵敏度 (100μm的32%,50μm的52%).
在早期的重建代中,异构结构显示出更好的对比恢复,而BGO在以后实现了优异的对比与噪声比.

结论:

不同结构的闪器为提高TOF-PET定时分辨率提供了一个有希望的途径.
灵敏度和定时分辨率之间的权衡需要在探测器设计中仔细考虑.
开发的模拟和重建技术为评估新型探测器架构提供了有价值的工具.

关键词:

异构结构异构结构 TOF正子发射断层扫描 (PET) 是一种图像重建图像重建一个金属发光器.有多个TOF内核.

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