螺旋CT机低对比分辨力及其影响因素的研究

Study of Helical CT Low-Contrast Resolution and Its Influencing Factors

通过实验研究螺旋CT的低对比分辨力及其影响因素。结果表明CT低对比分辨力随着mA、kV、层厚、扫描时间、重建视野的增大而增大 ,随着扫描物体厚度、重建矩阵、螺距增大而减小 ;高分辨重建算法引起低对比分辨力下降 ;多数情况下 ,螺旋扫描图像低对比分辨力略小于相应轴扫图像。全面地理解CT低对比分辨力及影响因素 ,对于正确评价、比较CT设备的性能十分重要。

This paper studies the helical CT low-contrast resolution and its influencing factors by experimental analysis.The CT low-contrast resolution increased with mA,kV,slice thickness,scan time and FOV,and decreased with matrix,pitch and thickness of the scanned objective.The reconstruction algorithm of high resolution results lower low-contrast resolution.Mostly helical image low-contrast resolution is slightly lower than axial image.It's very important for us to understand CT low-contrast resolution and its influencing factors for the correct evaluation of the performance of CT scanner.