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一个磁场兼容的读出电路,用于增强BGO切伦科夫辐射的TOF-PET探测器中的巧合时间分辨率

Shirin Pourashraf¹, Joshua W Cates², Craig S Levin³

¹Department of Radiology, Stanford University, Stanford, California, USA.

Medical physics

|January 31, 2025

概括

本研究介绍了一种新的电子读出电路,用于飞行时间的正电子发射断层扫描/磁共振成像 (TOF-PET/MRI) 探测器. 该电路即使在强磁场中也能实现出色的巧合时间分辨率 (CTR),这对于先进的PET/MRI扫描仪至关重要.

科学领域:

医学成像物理医学成像物理
探测器技术探测器技术
核仪器仪表核仪器仪表核仪器仪表

背景情况:

开发飞行时间的正电子发射断层扫描/磁共振成像 (TOF-PET/MRI) 探测器.
利用来自木德 (BGO) 晶体的快速切伦科夫光子,精确地估计511 keV光子到达时间.

研究的目的:

为基于BGO的TOF-PET探测器设计一个低噪音,高速的电子读出电路.
在强磁场的存在下增强巧合时间分辨率 (CTR).

主要方法:

基于BGO的TOF-PET探测器的评估CTR,具有高速,低噪音的读取链.
使用永久磁铁模拟强磁场环境.
采用来自BGO晶体的切伦科夫辐射和对紫外线敏感的光倍增器 (SiPMs) 来进行定时测量.

主要成果:

在没有磁场和带有磁场的情况下分别达到283 ± 8 ps和275 ± 10 ps的CTR (FWHM),使用切伦科夫和标准发光.
通过仅考虑切伦科夫元件,提高了CTR至236 ± 4 ps和216 ± 17 ps (FWHM).

结论:

在BGO探测器中开发了一种具有一致CTR的高性能读出电路,具有或没有强磁场.
在强磁场中证明了UVSiPM的有效运行,用于检测切伦科夫辐射.
强调了这项技术在基于BGO的TOF-PET/MRI扫描仪中的潜力.

关键词:

BGO BGO 的意思是在 CTR 中, CTR 是 CTR.切伦科夫 (Cherenkov) 是一个有关PET/MRI的研究.在TOF-PET中.非磁性的电磁体是没有磁性的.

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