Carotid plaque burden and composition features, particularly lipid necrotic core, are significantly associated with severity of CAD stenosis. This study aims to explore the relationship between various phenotypic patterns of carotid atherosclerosis with the prevalence, phenotype, and severity of coronary atherosclerosis. The patients with chest tightness or chest pain will receive carotid artery ultrasonography before coronary angiography so as to explore the relationship between them.