光子计数X射线探测器作为散射探测器
Elias Lahoud1, Yael Zaffrani1, Yoad Yagil1
1Philips Healthcare, Haifa, Israel.
Medical physics
|December 3, 2023
概括
光子计数探测器 (PCD) 现在可以实时估计散射,以改善CT成像. 这一突破利用电荷共享事件来增强散射估计和校正,从而提高图像质量.
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
- 图像重建 图像的重建
背景情况:
- 直接转换光子计数探测器 (PCD) 对未来的计算机断层扫描 (CT) 扫描仪至关重要,它可以提高分辨率,剂量效率和光谱性能.
- 然而,PCD并不是本质上设计用于减轻对象散射,这是CT成像中文物的主要来源.
研究的目的:
- 探索一种使用CT系统中现有的PCD阵列进行现场物体散射估计的新方法.
- 为了利用PCD来改进散射估计,通过更好地输入重建算法来提高图像质量.
主要方法:
- 调查了PCD使用防散网 (ASG) 的使用情况,引入一个小的空气间隙以促进电荷共享事件.
- 利用分裂电荷事件的光谱特征作为PCD缺乏这种能力的巧合计数的代理.
- 进行桌面实验,以评估ASG失调的影响,并使用PCD的低噪音能力测量PCD使用水柱的散射.
主要成果:
- 量化了对ASG对齐的光谱响应的高灵敏度,由于不对齐,60keV光子误报的概率增加了三倍.
- 观察到巧合数的增加与散射与初级比率 (SPR) 相成比例,与几何建模预测相匹配.
- 测量了来自水的真实空间散射信号,揭示了与计算一致的能量依赖,环形模式.
结论:
- PCD探测器提供了超出其主要功能的意想不到的能力,通过电荷共享实现现场散射估计.
- 证明了PCD在基准设置中的高度敏感测量的潜力,与基于同步仪的调查相提并论.
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