自动选择最佳期相在高心率患者冠状动脉CTA成像中的应用

摘要

目的 探讨自动选择最佳期相并重建血管功能在高心率(拍子数>80)患者的冠状动脉血管成像中的应用价值.方法 收集来院做CTA检查的高心率患者48例,Auto Gating推荐40％～55％期段扫描获取图像数据.对原始数据进行间隔1％的全期相重建和SmartPhase期相重建,选出全期相中最佳图像质量的期相作为对照组,SmartPhase期相作为试验组.对两组图像进行质量评分,并应用秩和检验比较分析两组图像质量有无差异.结果 试验组和对照组的期相选择有75％的相差不超过2％,对照组的图像质量总体评分:3.83±0.43;试验组的图像质量评分:3.80±0.43,两组图像没有统计学差异,P=0.680>0.05.当期相差距超过2％时,两组质量评分分别为:3.83±0.54和3.72±0.58;P=0.102>0.05,两组图像同样没有统计学差异.结论 SmartPhase自动选择时相重建血管的图像质量与重建筛选出的最佳图像质量没有统计学差异.SmartPhase功能只重建一期图像,避免了医技师多期相重建图像和筛选最佳图像的时间,具有较高的工作效率.%Objective To evaluate the effectiveness of the SmartPhase function on automatically select optimal cardiac phase and reconstruct images in the coronary artery computerized tomography angiography (CCTA) with high heart rate (beats per minute>80) patients.Methods Forty-eight patients who had undergone CCTA in our hospital were retrospectively collected. Scanning phase was 40％-55％ based on the recommendation from AutoGating. Images of the entire phase were reconstructed at a 1％ interval and the phase with the best image quality was selected as the control group. The phase chosen by Smartphase was the experimental group. The coronary artery image quality scores from the two groups were analyzed using the rank sum test.Results The phase difference between the two groups were within 2％ in 70％ of the total cases. Image quality score in the control group and in the experimental group were 3.83±0.43 and 3.80±0.43, respectively. There was no significant statistic difference between the two groups (P=0.680>0.05). When the phase difference was more than 2％, image quality score in the control and experimental group were 3.83±0.54 and 3.72±0.58,P=0.102>0.05. There was no significant statistic difference between two groups. Conclusion Image quality of the optimal cardiac phase selected by the SmartPhase function is statistically equivalent to that selected by blind readers. Smartphase provides the potential of higher work efficiency.