冠状动脉CTA扫描中采用智能期相技术与手动选取最佳期相的一致性

摘要

目的 初步评价在冠状动脉CTA扫描中智能期相技术自动选取最佳期相与手动选取最佳期相的一致性.方法 对100例疑诊冠心病患者行冠状动脉CTA,检查时开启智能期相技术,自动获取一组最佳期相轴位图像,同时手动选取一组最佳期相轴位图像,比较两组期相选择的一致性(期相差≤±2％为一致,期相差>±2％为不一致).记录患者体重指数、心率、CT值、客观噪声、辐射剂量.对最佳期相图像进行三维后处理及主观评分.结果 83例(83％)智能最佳期相与手动选取一致;17例不一致,其中8例重建图像的主观评分差异较小,能满足诊断要求,9例智能期相失败(其中3例高心率,2例房颤,4例早搏).在9例智能期相失败的患者中,每例至少有一支血管的重建图像不能达到诊断要求,而经手动选取最佳重建期相进行三维重建后,达到图像质量要求.结论 智能期相技术选择最佳期相与手动选取最佳期相具有较好的一致性,可有效简化重建流程,提高工作效率,同时获得较高质量的冠脉CTA重建图像.%Objective This study tried to evaluate the coincidence of selecting optimal cardiac phase between the smart phase technique and manual selection in coronary CTA (CCTA) examinations. Methods A total of 100 patients with suspected coronary artery disease who underwent CCTA examinations were included in this study. Smart phase technique and manual selection were used to select a group of axial images with optimum cardiac phase for each patient. The optimum cardiac phases selected by these two ways (coincidence: phase difference ≤±2％; noncoincidence: phase difference >±2％) were compared. The body mass index, heart rate, CT value, objective noise, dose-length product values were recorded. Results The results of auto selection of 83 cases (83％) were in accordance with the manually selected results. Among the 17 cases with differences between the auto and manual selection, 8 cases only had subtle differences which could meet the diagnostic requirement, while 9 cases failed to meet the diagnostic requirement (3 cases with high heart rate, 2 cases with atrial fibrillation and 4 cases with premature beats). In the 9 cases with failed diagnostic requirement, each had at least one major coronary branch reconstruction that failed to meet the diagnostic requirement. However, after manual selection, the images could be used for diagnosis. Conclusion The selecting optimal cardiac phase between the smart phase technique and manual selection was in good coincidence with CCTA examinations. Smart phase technique could greatly simplify 3D reconstruction workflow, increase efficiency and provide good coronary CTA reconstruction results.