64 channel multidetector-row Computed Tomography (CT) has been introduced for use in the diagnosis of coronary heart disease. The investigators aimed to characterize coronary artery disease in type 2 diabetes mellitus and metabolic syndrome, and in particular plaque natures depending on different status of metabolic diseases. The investigators also aimed to analyze the risk factors associated with number and severity of stenosis as well as plaque characteristics using logistic regression models.