They use technology such as sophisticated diagnostic ultrasound imaging machines and transducers that use high-frequency sound waves to produce dynamic visual images to complete important tasks, such as:

• Acquiring information related to the heart's anatomy and physiology
• Producing real-time images of cardiac structures to assist the physician in diagnosing cardiovascular disease
• Evaluating acquired and congenital cardiac abnormalities and associated complications
• Evaluating narrowed or leaking heart valves
• Looking for causes of murmurs, chest pain, shortness of breath
• Tracking and evaluating chronic heart conditions

Cardiac sonographers work directly with healthy and critically ill inpatients and outpatients of all ages in predominantly noninvasive procedures, carried out in small, low-lit rooms. They stand or sit beside the patient, who is on a stretcher, exam table or wheelchair. Sometimes the cardiac sonographer will transport a portable ultrasound to a patient's room and perform the test there.