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Background Using the spiral CT to scan coronary calcification, with qualitative and semi-quantitative method, to predict the presence and extent of coronary artery disease.Early diagnosis of coronary artery disease has been an important clinical issue.Coronary angiography was the gold standard for diagnosis of coronary artery disease, but to have invasive examination, only used in a small fraction of patients.Clinical diagnosis in most patients still needs to rely on non-invasive examination.Coronary artery calcium deposition within the intima is a sign of atherosclerosis.CAC was associated with the presence and extent of coronary atherosclerosis.