在光子计数检测仪CT上对单对比和双对比光谱成像的性能评估
Liqiang Ren1,2, Zhongxing Zhou1, Zaki Ahmed1,3
1Department of Radiology, Mayo Clinic, Rochester, Minnesota, USA.
Medical physics
|September 5, 2024
概括
光子计数探测器CT (PCD-CT) 显示了光谱成像能力,但在单对比材料分解方面低于双源双能量CT (DS-DECT). 两种平台上的双对比成像都会导致更高的错误率.
科学领域:
- 医疗成像医学成像
- 放射学 放射学是一门学科.
- CT CT 技术 技术 技术
背景情况:
- 光子计数探测器CT (PCD-CT) 的临床引入需要评估其光谱成像性能.
- 在单对比和双对比场景中缺乏PCD-CT光谱性能的全面评估.
研究的目的:
- 评估临床PCD-CT系统的光谱成像性能.
- 为了将PCD-CT性能与双源双能CT (DS-DECT) 进行比较,用于单对比 (/加多) 和双对比 (和加多) 的成像任务.
主要方法:
- 用PCD-CT和DS-DECT系统在水幻体中扫描和加多溶液及其混合物.
- 进行了材料分解 (两种和三种材料),并计算了和加多度的根平均平方误差 (RMSE).
- 在两个扫描仪的各种管电压设置中,在匹配的辐射剂量水平上进行扫描.
主要成果:
- 与PCD-CT相比,具有更大的光谱分离 (70/Sn150 kV,80/Sn150 kV) 的DS-DECT在单对比材料分解方面表现出较低的RMSE.
- PCD-CT显示在120/140kV和加多在140kV的最佳性能,但RMSE高于最佳DS-DECT设置.
- 对于双对比成像的三种材料分解导致PCD-CT和DS-DECT平台上的RMSE值大幅上升.
结论:
- 单对比材料分解的临床PCD-CT光谱性能取决于任务,通常低于最佳的DS-DECT设置.
- 使用三种材料分解的双对比成像具有重大挑战,这导致CT系统的错误率更高.
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