An echo technologist is a sonographer who conducts a diagnostic exam with an echocardiogram一a test that uses sound waves to create live images of the heart. As an echo technologist, you measure cardiovascular health by viewing blood flow and valve movement with the echocardiogram. Your duties include observing and taking images of a patient’s heart. You may also assist physicians with more complex procedures involving ultrasound. You report all information gathered, including concerns, to the patient’s physician(s).