Your cardiologist may refer you for an imaging study. There are a variety of advanced imaging technologies available today. These include echocardiogram, nuclear scan, computed tomography (CT) scan, positron emission tomography (PET) scan or magnetic resonance imaging test (MRI). One or more of these tests are usually combined with the ECG to provide images of the heart and often improve your doctor's ability to identify potential problems. Read more about these test by clicking the links below.