An echocardiographer uses ultrasound technology to create a specific type of sonogram, called an echocardiogram. The echocardiogram is an image of the chest or heart. A doctor can then use these images for diagnostic purposes in medicine. As an echocardiographer, you may perform the procedure when your patient is at rest or after they have performed physical activity. In addition to working with adult and child patients, you may also have prenatal duties, using sonography to assess the health of a fetus’s heart and determine whether the fetus has any visible cardiac conditions.