The average of integrated backscatter (AII) was measured and corrected as follows: IBS%= AII of plaque/ AII of adventitia of the same site.
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脱机后分析,感兴趣区(ROI)分别置于同一斑块内3个不同位置,记录每个采样的IBS均值(AII),并采取如下方法校正,用斑块同侧的颈动脉外膜的IBS值校正斑块AII值,即AII校正值(IBS%25)= 斑块AII值/同侧外膜AII值×100%25 。