提高晶体识别准确度的互动深度探测器系统与峰值到电荷歧视方法
Kento Miyata1, Ryo Ogawara2, Masayori Ishikawa3
1Graduate School of Biomedical Science and Engineering, Hokkaido University, N-15 W-7 Kita-ku, Sapporo 060-8638, Japan.
Sensors (Basel, Switzerland)
|July 11, 2023
概括
这项研究开发了用于正电子发射断层扫描 (PET) 的峰值到电荷歧视 (PQD) 探测器系统,以减少抛物误差. 该系统有效地区分了闪器层,提高了PET成像中的空间分辨率.
科学领域:
- 医学物理 医学物理
- 核仪器仪表 核仪器仪表 核仪器仪表
- 材料科学 材料科学 材料科学
背景情况:
- 波色子发射断层扫描 (PET) 中的 paralax 误差会降低空间分辨率.
- 相互作用深度 (DOI) 信息对于减轻这些抛物线误差至关重要.
- 之前的工作确立了LaBr3:Ce.Ce中的α衰变分离的峰值到电荷歧视 (PQD).
研究的目的:
- 开发基于PQD的DOI检测系统,用于在线处理和在PET中实现.
- 为了区分使用PQD的不同度的GSO:Ce闪器.
- 通过减少抛物线误差,提高PET中的空间分辨率.
主要方法:
- 使用四层GSO:Ce晶体 (0.5mol%和1.5mol%Ce度) 和PS-PMT构建了一个探测器.
- 在Xilinx Zynq-7000 SoC板上实现了PQD,配有8ch Flash ADC进行实时处理.
- 进行1D和2D PQD分析以评估性能.
主要成果:
- 1D PQD在相邻层之间实现了1.5,0.99和0.91的平均优点数字,而在1-3-3层中,错误率低于3.50%.
- 在2D PQD分析中,所有层次的平均优点数字大于0.9,错误率低于3%.
- 该系统显示了实时处理能力和灵活性.
结论:
- 开发的基于PQD的DOI探测系统有效地区分了具有不同Ce度的GSO:Ce闪器层.
- 这个系统可以在PET扫描仪中实现,以减少抛物线误差和增强空间分辨率.
- 该系统的实时处理和灵活性使其适用于实际的PET应用.
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