The aim of this randomized study is to evaluate the impact of Optical frequency domain imaging (OFDI) guidance for Percutaneous Coronay Intervention (PCI) with drug-eluting stent (DES) as compared with Intravascular ultrasound (IVUS) guidance.

Optical frequency domain imaging (OFDI) is a novel, high resolution intravascular imaging modality. Intravascular ultrasound (IVUS) is a widely used conventional imaging modality for achieving optimal stent deployment.

The aim of this randomized study is to evaluate the impact of OFDI guidance for Percutaneous Coronay Intervention (PCI) with drug-eluting stent (DES) as compared with IVUS guidance.

We will enroll 800 patients with a de novo lesion who will undergo PCI with DES as is routine practice. Patients will be rondomely assigned to either OFDI-guided PCI arm or IVUS-guided PCI arm.

Patients will then have a follow-up contact at the time of hospital discharge, 8 month and 12 month after PCI.

Inclusion Criteria:

• Patients with a de novo lesion (in the native coronary circulation) and planned to undergo drug-eluting stent implantation for indications according to the Japan and USA guidelines
• Patients aged between 20 and 85 years old
• Patients who has provided written informed consent

Exclusion Criteria:

• Patients with Acute Myocardial Infarction (AMI) within 3 months

• Patients with cardiogenic shock

• Patients with chronic heart failure

• Patients with renal failure (eGFR <= 30 ml/min/1.73 m2 or Serum creatinine level >=1.5mg/dL)

• Patients who are currently enrolled in other clinical trial which has possibility to influence the primary endpoint of OPINION trial.

• Patients planned use of bare metal stent

• Patients with 3-vessel diseases

• Planned surgery within 1 year

• Patient on dialysis

• Target lesion such as:

  • Left main coronary artery
  • Aorto-Ostial lesion location within 3mm of the aorta junction
  • Chronic total occlusion
  • Small vessel (reference vessel diameter <2.5mm)
  • Coronary artery bypass graft