重组相位窗对16层螺旋CT冠状动脉成像图像质量的影响

目的:探讨不同重组相位窗对16层螺旋CT冠状动脉成像质量的影响。方法:对28例健康体检者采用回顾性心电门控的16层螺旋CT冠状动脉成像,将其扫描原始数据分别按45%、55%、65%、70%、75%、85%R-R间期的不同相位的横断面进行重组。结果:左主干在6个R-R时相均显示良好;左前降支在70%R-R时相的重组图像质量最佳;左回旋支及右冠状动脉在75%R-R时相的重组图像质量最佳,整体图像在75%R-R时相的重组图像质量最佳。结论:重组相位窗对多层螺旋CT冠状动脉成像图像质量有重要影响作用。

Coronary Angiography with 16 Detector-row Spiral CT:Influence of Reconstruction Windows on Image Quality

Objective:To evaluate the influence of different reconstruction windows on image quality of 16 detector-row multi-sliced spiral CT coronary angiography(MSCTA).(Methods:)28 healthy volunteers had been scanned with ECG-gated MSCTA and the angiograms were studied retrospectively.Tomographic source images were individually reconstructed at the starting points of 45%,55%,65%,70%,75%,85% of R-R intervals after the relative previous R waves.Results:The left main coronary artery was well visualized in all 6 R-R phases.The left anterior descending artery was clearly visualized at 70% of R-R phases,while conspicuous demonstration of the right coronary artery and the left circumflex artery were seen at 75% of R-R phases.MSCTA images acquired by volume rendering at 75% R-R phases showed optimal quality.Conclusion:Image quality of MSCTA was highly dependent on heart rates and reconstruction windows.