Comparison of 18-F Sodium Fluoride Uptake in Culprit Plaques Between Acute Coronary Syndrome and Stable Angina

Inclusion Criteria: * Age more than 20 * Acute coronary syndrome or stable angina Exclusion Criteria: * Contraindications to the use of heparin, aspirin, clopidogrel, stainless metal, contrast media * Acute ST segment elevation myocardial infarction within 12hours, heart failure, cardiac shock * Any serious medical comorbidity such that the subject's life expectancy is less than 24 months * Ejection fraction less than 30 * Serum creatinine level of 1.5mg/dl and over * Vasculitis * Unwillingness or inability to cooperate or to give informed consent