Inclusion Criteria:  Adult age ≥18 years referred for clinically indicated coronary angiography Stable ischemic heart disease OR acute myocardial infarction as the indication for coronary angiography  Exclusion Criteria:  Clinical Exclusion criteria:  Estimated glomerular filtration rate < 45 mL/min History of allergic reaction to iodinated contrast media Pregnancy  Angiographic / Post-Cath Exclusion criteria:  Obstructive CAD (≥50% luminal obstruction in ≥1 major epicardial coronary arteries by invasive coronary angiography) Allergic reaction to iodinated contrast media