Assessment of Coronary Artery Lesion Using Optical Coherence Tomography Versus IntraVascular Ultrasound for BiorEsorbable Vascular Scaffold Implantation

Inclusion Criteria: * Age 20 years or older * Patients who have at least one epicardial coronary artery lesion with an evidence of inducible ischemia * Willing and able to provide informed written consent * Eligible for PCI Exclusion Criteria: * Patients presenting with STEMI within 2 weeks * Bypass graft lesion * Lesion with left main disease * Expected length of scaffold \> 40 mm * Bifurcation lesion requiring side branch stenting * Small vessels \< 2.75 mm * Stented lesion * Suspected coronary spasm even after sufficient nitrate injected * Cases in which the IVUS or OCT imaging catheter failed to cross the lesion * Poor quality IVUS or OCT images * Contraindication to dual anti-platelet therapy * Chronic total occlusion * Angiographically large-sized vessel (\>3.5mm of reference lumen diameter) * Life expectancy shorter than 2 years * Pregnancy