16层螺旋CT冠状动脉成像最佳重建时相探讨

目的：探讨16层螺旋CT冠状动脉成像的最佳重建时相。方法：对40例临床诊断或拟诊冠心病的患者行16层螺旋CT冠状动脉成像检查，利用原始数据分别在每个R波前300ms、400ms、500ms、600ms处进行图像重建，得出不同重建时相的横断面图像，然后在工作站进行最大密度投影(MIP)、多平面重建(MPR)、容积再现技术(VRT)等方法的重建，评价不同重建时相冠状动脉各主要分支的图像质量等级及显示的节段数。结果：左冠状动脉主干在各个时相均显示良好，左前降支最佳重建时相为R波前400ms及500ms处，左回旋支及右冠状动脉最佳重建时相为R波前400ms处。结论：选择最佳时相进行图像重建可以最大限度减轻心脏运动伪影，提高图像质量。

The significance of optimal reconstruction phase of coronary artery imaging with 16-slice spiral CT

Objective:To investigate the optimal reconstruction phase of coronary artery imaging with 16-slice spiral CT.Methods: Forty patients with suspected or diagnosed coronary artery disease were studied with 16-slice spiral CT. Raw data of every case was reconstructed at the time point of 300ms, 400ms, 500ms, 600ms before each R wave respectively, and the axial images induced in different phases were reconstructed in work station and MIP, MPR and VRT were made. We evaluated grade of the image quality and segments of the main coronary artery branches in different reconstruction phases.]Results:The left main coronary artery was displayed well in every phase and the optimal reconstruction phase of the left anterior descending, the circumflex and the right coronary artery was respectively the time point of 400ms and 500ms, 400ms, 400ms before R wave.Conclusion:Image reconstruction in the optimal phase can decrease the artifacts of cardiac motion as possible and improve the quality of images.