AI Quantitative Coronary Angiography Versus Optical Coherent Tomography Guidance for Coronary Stent Implantation

Inclusion Criteria: * Men or women at least 19 years of age * Patients with typical symptoms or objective evidence of myocardial ischemia and eligible for coronary angioplasty. * Subject with severe coronary artery disease undergoing PCI * Written informed consent Exclusion Criteria: * Angiographic exclusion criteria 1) Left main lesion 2) Chronic total occlusion 3)Graft vascular lesion 4) Requiring two-stent techniques for coronary bifurcation lesions 5)Any lesion characteristics resulting in the expected inability to deliver OCT catheter to the lesion ( eg,tortuosity, moderate or severe vessel calcification) * Acute or chronic renal dysfunction (Plasma creatinine 2.0mg/dL or more) except patients undergoing dialysis * Primary coronary angioplasty in ST-elevation myocardial infarction(within 12-24 hours of symptom onset) * Previous PCI with BVS * LV dysfunction (LVEF) \< 30% * Hypersensitivity to DES and its components or there is a reason for prohibition (everolimus, cobalt, chromium, nickel, platinum, tungsten, acrylic and fluoro polymers) * Patients who require surgery requiring discontinuation of antiplatelet drugs within 1 year of the procedure * Life expectancy \< 1 year for any disease * Pregnancy or breast-feeding * Patients unsuitable for enrollment judged by the Investigator