MSCT结合心电门控在主动脉夹层扫描中的应用价值

Valuation of ECG-gating and MSCT in aortic dissection scanning

[目的]探讨MSCT结合心电门控在主动脉夹层扫描中的应用价值及意义。[方法]18例主动脉夹层患者行MSCT增强扫描：先行MSCT增强主动脉全程扫描,延迟15-20 min后进行心电门控增强扫描,扫描范围：胸廓入口至主动脉裂口处。普通增强扫描进行层厚2 mm,层间隔1 mm图像重建,心电门控增强扫描行55%R-R间期层厚2 mm,层间隔1 mm图像重建。将两次扫描图像进行同层面比较,寻找内膜片中断处。[结果]18例患者MSCT主动脉全程增强扫描均满意观察到真、假腔的大小、范围、主要分支是否受累。18例采用心电门控扫描显示胸廓入口至主动脉裂口水平的主动脉真假腔与全程增强扫描一致。在普通增强扫描中18例患者中8例比较清晰显示第1破口,10例患者第1破口不明确;采用心电门控扫描图像中18例均清晰显示第1破口。[结论]MSCT增强扫描可以明确诊断主动脉夹层,加入心电门控扫描可准确显示第1破口。

[ Objective] To discuss the value and significance of MSCT combined with ECG- gating in the aortic dissection scanning. [ Methods] Eighteen cases were examined with MSCT： first the total aortic with MSCT, after 15 - 20 minutes with MSCT combined with ECG - gating from the entrance of thorax to the rupture of aortic. Then the two kinds of source images were reconstructed with the slice of 2 mm thickness and 1mm interval, the source images with MSCT combined with ECG - gating were chosed in the 55% R - R interval. At last the two kinds of source images were compared in the same slice and found the rupture of aortic. [ Results ] All 18 cases were observed the real and the false cavity satisfiedly in two kinds of scanning. Although only 8 cases who were performed with MSCT observed the first rapture, all 18 cased who were performed with MSCT combined with ECG - gating observed the first rupture. [ Conclusion ] MSCT can clearly diagnosis aortic dissection, MSCT combined with ECG - gating can help show the first rupture exactly.