Echocardiography refers to the use of ultrasound to assess cardiovascular anatomy. A cardiac sonographer who is specially trained in the field of echo performs the exam. The electrocardiography technicians operate the ultrasound equipment that collects reflected echoes and Doppler signals from images and spectral tracings of the heart. Two-dimensional images and Doppler tracings are used to examine and evaluate the heart: chamber sizes, arrangement of the parts, muscle function, valve function and blood flow.

• Being an electrocardiography technician or a cardiac sonographer used to require an Associates degree in Echo and passing a National Registry exam, but as the field gets more developed and complicated, it more and more requires a Bachelors degree.
• In addition to knowing how to operate the machinery, it is important for a cardiac sonographer to posses interpersonal skills since they work closely with patients throughout procedures.
• Fields for electrocardiography technicians include hospital cardiology departments, physicians' offices, cardiac rehabilitation centers, health maintenance organizations, or clinics.