Evaluation includes intima - media thickness (IMT) of common carotid artery (CCA) diastolic di-ameter(D) and serious degree and the numbers of plaque occurrence.

• 颈总动脉(common carotid artery，CCA)内膜中层厚度(intima-media thickness，IMT)的测量：横纵向观察颈总动脉，颈总动脉后壁纵向超声显像可表现为由相对较低回声分割的两条平行亮线。