使用双能量计算机断层扫描计算的霍恩斯菲尔德单位变化:双层,双源和快速千伏切换技术的比较
Shingo Ohira1,2, Junji Mochizuki3, Tatsunori Niwa4
1Department of Comprehensive Radiation Oncology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan. ohira-shingo@outlook.jp.
Radiological physics and technology
|May 3, 2024
概括
双能CT扫描仪显示Hounsfield单位 (HU) 值的显著变化,特别是在光束硬化效应下. 与双层CT (DLCT) 和快速千伏切换CT (FKSCT) 相比,双源CT (DSCT) 在HU值中表现出更高的稳定性.
科学领域:
- 医学成像物理 医学成像物理
- 辐射技术 辐射技术
- 计算机断层扫描 (CT) 是一种计算机断层扫描.
背景情况:
- 双能计算断层扫描 (DECT) 能够实现先进的材料分解和定量成像.
- 准确的霍恩斯菲尔德单位 (HU) 值对于一致的组织表征和诊断解释至关重要.
- 梁硬化效应可以在基于CT的定量测量中引入显著的文物和不准确性.
研究的目的:
- 为了研究和比较不同的DECT扫描仪技术中Hounsfield单位 (HU) 值的变化.
- 评估光束硬化效应对各种DECT系统中HU值精度的影响.
- 为了确定双层CT (DLCT),双源CT (DSCT) 和快速千伏切换CT (FKSCT) 在保持HU值稳定的性能.
主要方法:
- 使用DLCT,DSCT和FKSCT扫描了16种参考材料的组织特征化幻影.
- 在参考条件下 (全剂量,没有包装) 和模拟梁硬化条件下 (半剂量,包装) 进行扫描.
- 重建了单能CT (SECT) 图像和70 keV和140 keV的虚拟单色图像 (VMI),并测量了HU值.
主要成果:
- 梁硬化效应显著增加了HU值差异,特别是在电子密度较高的材料中.
- 在光束硬化条件下,双源CT (DSCT) 与SECT和VMI的DLCT和FKSCT相比,在光束硬化条件下显示出显著较小的HU值差异.
- 在不同的扫描条件和能量水平中,DLCT显示了最大的HU值变化.
结论:
- 选择DECT扫描仪技术显著影响HU值的准确性和对光束硬化工件的易感性.
- DSCT在保持HU值的一致性方面表现出卓越的稳定性,使其在定量成像应用中更可靠.
- 需要进一步优化重建算法和扫描协议,以减轻DLCT和FKSCT系统中的光束硬化效应.
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