Cardiac imaging is a subspecialty of diagnostic radiology. A cardiac radiologist supervises or performs and then interprets medical images to diagnose diseases of the heart such as heart disease, leaky heart valves and defects in the size and shape of the heart. A cardiac radiologist uses imaging techniques such as X-rays, ultrasound (echocardiograms), CT (computed tomography) scans and MRI (magnetic resonance imaging) scans. These tests are used to screen for heart disease, determine what is causing your symptoms and monitor your heart and find out if your treatment is working. Thoracic...