Echocardiogram is a test that uses sound waves to create a moving picture of the heart. The picture is much more detailed than x-ray image and involves no radiation exposure. An instrument that transmits high-frequency sound waves called a transducer is placed on your ribs near the breast bone and directed toward the heart. The transducer picks up the echoes of the sound waves and transmits them as electrical impulses. The echocardiogram machine converts these impulses into moving pictures of the heart. Echocardiogram works well for most patients and allows doctors to see the heart beating and to visualize many of the structures of the heart.