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改进使用全球和本地模型参数的光子计数探测器模型的模型数据不匹配.

Donghyeon Lee1, Xiaohui Zhan2, W Yang Tai3

  • 1The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

Medical physics
|December 8, 2023
PubMed
概括

本研究引入了一种改进的光子计数探测器 (PCD) 模型,具有计数率依赖的参数,以准确地描述X射线光谱,解决以前模型的局限性,以获得更好的临床应用.

关键词:
分担费用是指分担费用.计算机断层扫描 (CT) 是一种计算机断层扫描.光子计数探测器的探测器脉堆积堆积起来.

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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
  • 计算建模 计算建模

背景情况:

  • 光子计数探测器 (PCD) 提供临床优势,但它们的能量分辨能力因电荷共享和脉冲堆积而降低,扭曲X射线光谱.
  • 现有的PCD输出模型显示一致,但遭受全球模型数据不匹配和像素对像素的变化.

研究的目的:

  • 通过结合计数率依赖的参数来改善PCD建模,以解决模型数据不匹配和像素变化.
  • 与物理探测器对比,评估增强的PCD模型的准确性.

主要方法:

  • 一个级联模型被调整为条件依赖和像素特定的参数,以减轻差异.
  • 模型参数估计使用来自不同幻影厚度和X射线管流的数据.
  • 使用基于CdZnTe的PCD验证了性能,通过平均绝对百分比误差 (MAPE) 将模型与默认,全球和全球和本地参数进行比较.

主要成果:

  • 拟议的模型表现出强烈的视觉一致性与PCD测量在各种计数率.
  • 大幅减少了MAPE:49.2-51.1% (默认),8.0-9.8% (全球) 和1.2-2.7% (全球和本地参数).

结论:

  • 增强的PCD模型准确地估计了从低到高计数率的探测器输出.
  • 该模型预计将在需要精确的像素对像素PCD特征的应用中具有价值.