用TOF-PET的FastIC ASIC提高CTR,通过通过基线校正克服SiPM噪声来改善CTR
Afonso Silvério Xavier De Matos Pinto1, Nicolaus Kratochwil2, Sergio Gómez3
1I3N Physics Department (I3N) at the University of Aveiro, Portugal.
IEEE transactions on radiation and plasma medical sciences
|February 2, 2026
概括
对于飞行时间正子发射断层扫描 (TOF-PET) 的光倍增器 (SiPM) 的进步受到信号噪声的限制. 这项研究引入了一种标记噪音事件的方法,显著改善TOF-PET探测器的定时分辨率.
科学领域:
- 医疗成像医学成像
- 核物理 核物理 核物理
- 探测器技术 探测器技术
背景情况:
- 飞行时间正子发射断层扫描 (TOF-PET) 已经显著改善了定时分辨率.
- 光倍增器 (SiPM) 对TOF-PET至关重要,但在高偏差电压下运行时会带来噪声.
- SiPM噪声会导致基线波动和时间步行,限制TOF-PET系统的计时性能.
研究的目的:
- 调查SiPM基线波动对TOF-PET计时性能的影响.
- 开发和评估一种可扩展的方法,用于标记TOF-PET探测器中的噪音事件.
- 评估SiPM噪声的不同分类和校正技术的有效性.
主要方法:
- 利用FastIC ASIC,一个可扩展的多通道读取,来检查SiPM基线波动.
- 实现了一个由暗计数触发的比较器信号,在闪光前标记杂事件.
- 使用BGO,LYSO晶体和EJ232塑料闪器与模拟SiPM相连,测试了分类和校正方法.
主要成果:
- 对噪音事件进行时间步行校正,使BGO晶体中的巧合时间分辨率 (CTR) 降低了5% (410 ps 至 388 ps).
- 过噪音事件改善了LYSO晶体的CTR11% (107 ps到93.5 ps).
- 在EJ232塑料闪光灯 (82.2 ps到75 ps) 中,CTR得到了9%的改善.
结论:
- 成功开发了一种可扩展的方法,用于在TOF-PET系统中标记不必要的SiPM事件.
- 开发的方法有效地减轻SiPM噪声,从而显著改善了巧合时间分辨率.
- 这项工作突出了SiPM噪声对快速定时应用程序的影响,并为TOF-PET探测器提供了实用解决方案.
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