Technologists who use ultrasound to examine the heart chambers, valves, and vessels are referred to as Echocardiogram Technicians or Cardiac Sonographers. This profession requires application of good judgment, and the ability to provide competent medical services to patients using diagnostic sonography equipment. The images created with the use of ultrasound instrumentation are called Cardiac Sonograms or Echocardiograms. Cardiac Sonographers “Echocardiogram Technicians” work under the supervision of a licensed physician. They may perform Echocardiogram while the patient is either resting or after physical activity. Data obtained is used to assist the physician with diagnostic decision. Cardiac Sonographers “Echocardiogram Technicians” may administer medication to physically active patients to assess their heart function. Cardiac Sonographers “Echocardiogram Technicians” also may assist physicians who perform Transesophageal Echocardiography, which involves placing a small transducer in the patient’s esophagus to obtain ultrasound images.