Transesophageal echocardiography is a test that allows your doctor to record images of your heart from inside your esophagus, or food pipe. The esophagus lies just behind the heart, therefore viewing heart images from this position produces clearer pictures of the heart's movement, than does standard echocardiography taken from outside the chest. During TEE, as with standard echo, harmless sound waves bounce off your heart. The images created with these sound waves help your doctor to identify and treat problems such as infection, disease, or defects in your heartís walls or valves.