Diagnostic Imaging Services: Ultrasound

Ultrasound technology uses sound waves to transmit images of internal organs and other fluid filled structures of the body. Sound waves are send and received by an instrument called a transducer. When the transducer is passed over an area of the body, sound waves bounce off solid internal objects. The transducer sends this sound wave information to a computer. The computer processes the information by producing images of internal structures on a screen. Ultrasound is used for a variety of reasons, such as assessing fetal development, detecting internal injuries, organ abnormalities and tumors, or in evaluating the internal functioning of blood vessels and arteries.

Depending upon the area being examined, patients may be advised to refrain from eating and consuming fluids; to fast for eight to twelve hours; or to drink a certain amount of clear fluids prior to the test. The length of an ultrasound test varies from thirty minutes to several hours. Prior to the examination, patients are asked to remove all jewelry and metal objects and to wear a gown.

During the procedure, patients lie on a padded table and remain still. An ultrasound technologist spreads a clear gel on the area being examined. The technologist then uses the transducer by moving it back and forth over the area being examined. Patients may feel a slight amount of pressure being applied by the technologist. After the test, there may be a waiting period, while the technologist reviews the results of the ultrasound.

Click here for information on specific ultrasound tests and procedures.