Ultrasound examination of carotid vessels is mainly used to assess the condition of the lumen and wall of the carotid and vertebral arteries. It is one of the effective means to diagnose and evaluate lesions of the carotid artery wall and plays a key role in the epidemiological investigation of atherosclerosis and the evaluation of the effectiveness of atherosclerosis prevention and treatment trials. The examination can clearly show whether the intima-media is thickened, whether there is plaque formation, the echogenicity and morphology of the plaque and the risk of dislodgement, whether there is stenosis and the degree of stenosis, whether there is occlusion, and other details, as well as accurate measurement and localization, and it can also analyze the hemodynamic results of the tested arteries.