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一个系统的基于任务的图像质量评估光子计数和能量集成CT作为重建内核和幻影大小的函数

Mridul Bhattarai^1,2,3, Steve Bache⁴, Ehsan Abadi^1,2,3

¹Medical Physics Graduate Program, Duke University, Durham, North Carolina, USA.

Medical physics

|July 20, 2023

概括

光子计数CT (PCCT) 和能量集成CT (EICT) 的图像质量相似,PCCT提供类似或更好的噪声和对比度. 然而,PCCT尖内核的分辨率低于EICT尖内核.

科学领域:

医疗成像医学成像
放射学放射学是一门学科.
计算机断层扫描 (CT) 是一种计算机断层扫描.

背景情况:

图像质量在CT扫描仪受物体大小,辐射剂量和内核选择的影响.
光子计数CT (PCCT) 和能量集成CT (EICT) 代表了具有潜在不同的图像质量特征的不同探测器技术.

研究的目的:

进行PCCT和EICT系统之间的任务通用图像质量的全面比较.
为了评估影像质量作为幻影大小,辐射剂量和重建内核选择的函数.

主要方法:

利用一个尺寸变异的幻影 (水星幻影3.0) 来评估不同尺寸的物体的图像质量.
在特定剂量的西门子SOMATOM Force (EICT) 和NAEOTOM Alpha (PCCT) 系统上扫描幻影,匹配CTDIvol.
使用FBP和代算法与Body常规 (Br) 内核重建图像,根据AAPM TG-233标准评估噪声,空间分辨率,CNR和可检测性.

主要成果:

两种PCCT (T3D和70-keV-VMI) 在类似的内核类型中都显示出与EICT相比的或优异的噪声,对比度和CNR.
使用PCCT尖内核 (Br64) 的空间分辨率低于512x512矩阵上的EICT尖内核.
与PCCT-T3D和EICT相比,PCCT-70keV-VMI显示和骨插件的对比一致性更好.

结论:

当使用类似命名的内核时,PCCT系统比EICT系统提供可比或改进的图像质量指标 (噪音,对比度,CNR).
在PCCT和EICT之间,根据患者大小和剂量水平精确匹配图像质量内核的需要可能是最小的,除非在极低信号条件下.
虽然PCCT在噪音和对比度方面表现出色,但EICT可能会在512x512矩阵上提供更高的空间分辨率,并且具有利的核心.

关键词:

计算机断层扫描计算机断层扫描对比对比对比的对比对比对比的对比对比对比的对比对比对比对比的对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比对比度与噪声比的比率.可检测性指数是指可检测性指数.集成能源的CT CT.噪声功率频谱噪声功率频谱摄像头计数CT CT 测量任务转移功能任务转移功能

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