⁃ ① Patients aged 19 years old

⁃ ② Patients who underwent successful PCI with one or more contemporary drug-eluting stents (stent diameter ≥3mm) or drug-coated balloons.

⁃ ③ Patients must have at least one of the following criteria of complex coronary artery lesions or high-risk clinical characteristics:

⁃ A. Complex coronary artery lesions:

⁃ i. True bifurcation lesion (Medina 1,1,1/1,0,1/0,1,1) with side branch ≥2.5mm size ii. Chronic total occlusion (≥3 months) as target lesion iii. PCI for unprotected left main (LM) disease (LM ostium, body, distal LM bifurcation including non-true bifurcation) iv. Long coronary lesions (used stents or drug-coated balloons ≥38 mm in length) v. Multi-vessel PCI (≥2 major epicardial coronary arteries treated at one PCI session) vi. Multiple devices needed (≥3 more stents or drug-coated balloons per patient) vii. In-stent restenosis lesion as target lesion viii. Severely calcified lesion (encircling calcium in angiography) ix. Left anterior descending (LAD), left circumflex artery (LCX), and right coronary artery (RCA) ostial lesion

⁃ B. High-risk clinical characteristics:

⁃ i. Acute myocardial infarction (ST-elevation myocardial infarction \[MI\] or non-ST-elevation MI) with or without cardiogenic shock (SCAI Classification ≥C) at presentation ii. Diabetes mellitus which requires medical treatment (oral hypoglycemic agents or insulin) iii. End-stage renal disease under dialysis iv. Combined vascular disease other than coronary artery disease

• Peripheral artery occlusive disease which is defined as A. Previous aorto-femoral bypass surgery, limb bypass surgery, or percutaneous transluminal angioplasty revascularization of the iliac, or infra-inguinal arteries, or B. Previous limb or foot amputation for arterial vascular disease, or C. History of intermittent claudication and one or more of the following: 1) An ankle/arm blood pressure (BP) ratio \< 0.90, or 2) Significant peripheral artery stenosis (≥50%) documented by angiography, or by duplex ultrasound, or D. Previous carotid revascularization or asymptomatic carotid artery stenosis ≥50% as diagnosed by duplex ultrasound or angiography.

• Thoracoabdominal aortic disease which is defined as A. Documented thoracoabdominal aortic aneurysm by duplex ultrasound, angiography, or computed tomography angiography B. Previous endovascular or surgical treatment for thoracoabdominal aortic aneurysm

• ④ Subject who can verbally confirm understandings of risks, benefits and surveillance strategy alternatives of receiving CCTA and he/she or his/her legally authorized representative provides written informed consent prior to any study related procedure.