64排螺旋CT冠状动脉成像重建的最佳R-R时相及其对图像质量的影响

Influence of coronal arterial image quality of 64 detector row CT in patients with ECG-gated scanned and optimal R-R phase imaging reconstructed

目的探讨重建相位对64排螺旋CT冠状动脉造影图像质量的影响。方法对56例拟诊冠心病患者行64排螺旋CT扫描后,使用Philips独立工作站提供的冠状动脉分析软件,进行冠状动脉重建。重建的方法包括容积再现、多平面重组、最大密度投影和曲面重组等。分析不同R-R时相各支冠状动脉的显示情况。结果右冠状动脉近段、远段及左前降支、左回旋支近段的最佳重建时相是70%～75%,右冠状动脉中段、后降支及左回旋支远段重建的最佳时相为70%～75%或35%～40%。结论选择回顾性心电门控最佳R-R时相重建冠状动脉可最大限度减轻心脏运动伪影,提高图像质量。

Objective To evaluate the influence of different reconstruction windows on image quality of 64 detector row CT coronary angiography. Methods A total of 56 patients with known or suspected coronary artery disease （CAD） were detected with retrospectively ECG-gated 64-detector-row CT coronary angiography, cross-during a single breath hold. All data of CT scan were transmitted to the EBW workstation, where three-dimensional reconstruction methods were volume rendering （VR）, multi-planar reformation （MPR）, maximum intensity projection （MIP）, curved planar reformation （CPR） and other analysis software on coronal atery. The quality of images reconstructed with different R-R phase was analyzed in terms of artifacts and visibility. Selective coronary angiography was used for reference. Results The best reeonstruction time of proximal and distant segments of the right coronary artery, left anterior descending artery （LAD）, the proximal segments of left circumflex artery （LCX） were 700.%- 75%, The best reconstruction time of mid-segments of the right coronary artery, PDA and distant segments of LCX were 70%-75% or 35%-40%. Conclusion The optimal R-R phase of retrospectively ECG-gated reconstruction images can decrease the artifacts of cardiac motion and improve the reconstructive image quality of coronary arteries.