Echocardiogram or ECG is a diagnostic procedure to evaluate the structure and function of the heart. The test uses high-pitched sound waves that are harmless and painless to the human body. During the procedure, the high-pitched sound waves are directed at the heart with a device called a transducer. Echoes are produced as the sound waves reflect off the various parts of the heart. The transducer picks up these echoes and relays them to a computer which processes the information to create moving pictures of the heart which are viewable on a monitor.