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目的:比较64层MSCT冠状动脉CTA检查时心肌低密度与增强MRI延迟强化对心肌梗死体积显示的差异。材料和方法:回顾性测量同时行64层MSCT和DE-MRI检查的心肌梗死患者23例。64层MSCT冠状动脉CTA图像进行左室短轴位图像重建,层厚8mm,层间隔8mm。测量每层短轴位图像上心肌低密度面积,将各层低密度面积累计积分得到体积。上述患者行DE-MRI延迟扫描,左室短轴位层厚为8mm,层间隔8mm,将各层中延迟强化心肌面积进行累计积分,得到MRI延迟强化测量的心肌梗死体积。将上述两种方法测量的体积进行配对t检验,以DE-MRI延迟强化得到的体积做为参考标准,比较MSCT通过心肌低密度判断心肌梗死的准确性。结果:64层MSCT冠状动脉CTA图像低密度与DE-MRI延迟强化测量得到的体积分别为(7.66±5.95)ml和(15.33±9.71)ml,P<0.01,二者相关系数为0.727。结论:通过64层MSCT冠状动脉CTA显示心肌低密度判断心肌梗死与DE-MRI有一定相关性,但会低估梗死的范围。
OBJECTIVE: To compare the differences in myocardial infarction size between low-density myocardium and enhanced MRI delayed-delaying in CTA 64-slice MSCT coronary angiography. MATERIALS AND METHODS: Twenty-three patients with myocardial infarction who underwent 64-slice MSCT and DE-MRI simultaneously were retrospectively reviewed. 64-slice MSCT coronary CTA images of left ventricular short-axis image reconstruction, thickness 8mm, 8mm interval. Measure the low-density area of myocardium on each short-axis image, and accumulate the low-density area of each layer to get the volume. The patients underwent DE-MRI delayed scan, left ventricular short axis bit thickness of 8mm, 8mm interval between layers, the layers of delayed enhancement of myocardial accumulation of points to obtain MRI delay enhancement measured myocardial infarction volume. The volumes measured by the above two methods were paired t-test, the volume obtained by DE-MRI delay enhancement was used as a reference standard, and the accuracy of MSCT in myocardial infarction was evaluated by myocardial low density. Results: The volumes of 64-slice MSCT coronary angiography with CTA images were (7.66 ± 5.95) ml and (15.33 ± 9.71) ml, respectively, with DE-MRI delay enhancement, with a correlation coefficient of 0.727. Conclusion: There is a certain correlation between myocardial infarction and DE-MRI through 64-slice MSCT coronary artery CTA, but it will underestimate the infarct size.