自动选择最佳时相在心律不齐患者心脏冠脉CTA中的应用

Assessment of Automatic Selection of the Optimum Cardiac Phase in Coronary CTA For Patients with Arrhythmia

目的探讨自动选择最佳时相功能在心率不齐患者心脏冠脉CTA成像中的应用。方法收集来院做CTA检查的心律不齐患者32例,采用Autogating推荐的时相区间获取图像数据。根据重建图像时相选择的不同分为两组:A组以时相区间的人工选择时相重建图像;B组在时相区间中自动选择最佳时相重建图像。测定各组图像主动脉弓根部的CT值、噪声SD并计算信噪比SNR;对图像各主血管进行主观质量评分并比较分析。结果 A组右冠状动脉、左冠状动脉主干、左回旋支及左前降支的图像质量评分分别为:2.53±0.76、3.75±0.57、3.16±0.68、3.56±0.62,而B组分别为:3.50±0.72、4.03±0.18、3.72±0.52、3.94±0.35,组间比较差异有统计学意义(P<0.05)。结论心律不齐患者进行心脏冠脉CTA检查时,使用自动选择最佳时相重建血管图像可以获得良好的图像质量满足临床诊断的要求。

Objective To assess the application of automatic selection of optimal phase function in coronary artery CTA imaging in arrhythmia patients. Methods Thirty-two arrhythmia patients who underwent CTA were collected and the image data were obtained by Autogating’s recommendation. According to the different phases of the reconstructed image, they were divided into two groups. In group A, the images were reconstructed with artifcial selection of optimal phase in the time interval. In group B, the images were reconstructed with automatic selection of optimal phase in the time interval. The CT value and the noise SD of the aortic arch root were measured and the signal-noise ratio （SNR） was calculated in each group. The subjective quality scores of the main blood vessels were compared and analyzed. Results The image quality scores of right coronary artery （RCA）, left main coronary artery （LMCA）, left circum？ex coronary （LCX） artery and left anterior descending （LAD） artery in group A were 2.53±0.76, 3.75±0.57, 3.16±0.68 and 3.56±0.62, respectively, while those in group B were： 3.50±0.72, 4.03±0.18, 3.72±0.52 and 3.94±0.35. There were signifcant differences between the two groups （P〈0.05）. Conclusion When the coronary heart disease patients with arrhythmia are examined with CTA, the application of automatic selection of optimal phase for blood vessel image reconstruction can meet the clinical diagnostic requirements.