Diagnostic medical sonographers, also known as ultrasound technologists, operate ultrasound equipment under the supervision of a doctor to reveal internal anatomical structures and medical conditions that cannot be captured by x-rays.

Sonographers use ultrasound equipment to direct high-frequency sound waves into specific areas of a patient's body to produce images of the shape, position, or movement of organs, fluid accumulations, masses, or fetuses. These images may be viewed on a video screen or converted to photographs or printouts and used by physicians to make diagnoses. 

Sonographers select and set up appropriate equipment for the test, explain the procedure to patients, help patients to assume the correct physical position, and put patients at ease. During the procedures, they observe the sound-wave display screen, adjust equipment to ensure a clear image, and maintain a log of ultrasonic tests.

Work Environment
Most sonographers work in hospitals, either at the bedside of the patients or in surgery. They may work alone or with other health professionals. Others may work in physician offices or in industry.

Length of Training/Requirements
Programs may be one, two, or four years in length, depending on program design, objectives, and the degree or certificate awarded. Applicants to one-year programs must possess qualifications in a clinically related allied health profession. Applicants to two-year programs must be high school graduates or hold a high school diploma equivalent.

Salary
$22,500-$42,500

Information from: http://www.etxahec.org/hcp/17e.htm