心率及重建相位窗对多层螺旋CT冠状动脉造影图像质量的影响

Multi-slice spiral CT coronary angiography: influence of heart rate and reconstruction window on image quality

目的 探讨心率及重建相位窗对多层螺旋CT冠状动脉造影图像质量的影响。方法80例健康体检者行 16层螺旋CT回顾性心电门控条件下冠状动脉造影。结果 每位患者的 4条冠状动脉分支 (左冠状动脉主干、左前降支、左回旋支、右冠状动脉 )分别用于图像质量分析。心率≤ 6 0次 /min者 ,有 82 1% (4 6 / 5 6支 )的图像可用于诊断 ;心率 6 1～ 70次 /min者 ,有 6 3 4 % (10 4 / 16 4支 )的图像可用于诊断 ;心率 71～ 80次 /min者 ,有 4 1 2 % (2 8/ 6 8支 )的图像可用于诊断 ;心率 80次 /min以上者有 31 2 % (10 / 32支 )的图像可用于诊断。左冠状动脉前降支在 6 0 %～ 70 %的重建相位窗时图像质量最佳 ,左冠状动脉回旋支在 5 0 %～ 6 0 %时最佳 ,右冠状动脉重建相位窗为 5 0 %～ 70 %较满意。结论 心率及重建相位窗对多层螺旋CT冠状动脉造影图像质量有重要影响作用。

Objective To evaluate the influence of heart rate and reconstruction window on image quality of multi-slice spiral CT coronary angiography. Methods Retrospectively ECG-gated MSCT coronary angiography were performed in 80 healthy cases. Results Four coronary (RCA, LM, LAD, LCX) segments were analyzed in each patient with regard to image quality. 82.1% (46/56) of the coronary segments were sufficient for analysis in patients with heart rate ≤60 bpm, 63.4% (104/164) with 61- 70 bpm, 41.2%(28/68) with 71-80 bpm, and 31.2%(10/32) with > 80 bpm, respectively. The left anterior descending artery, left circumflex artery, and the right coronary artery were best visualized when the reconstruction window was 60%-70%, 50%-60%, and 50%-70%, respectively. Conclusion Image quality of MSCT coronary angiography is highly dependent on heart rate and reconstruction window.