Evolving indications for MDRCT coronary angiography include Asymptomatic high-risk patients or patients with atypical or typical angina who have inconclusive exercise stress test results, cannot undergo exercise stress testing, or need to undergo major noncardiac surgery Patients in whom invasive coronary angiography was unable to locate a major coronary artery or graft Cardiac MRI is invaluable in evaluating many cardiac and great vessel abnormalities.