Cardiologists can use advanced imaging techniques to learn more about the heart and guide interventions. CT angiography is a test that can be used in diagnosing coronary artery disease by directly visualizing the coronary arteries. Similarly, cardiac MRI is useful in patients with suspected heart failure, valve issues, and previous heart attacks. It can also help identify risks for sudden cardiac arrest and indications for implantable cardiac devices. PET scans offer insight into heart metabolism beyond the normal nuclear stress test. With many tools available, it is important to talk to a heart specialist to see what tests are best for you and to notify them of any allergies or restrictions to testing.