Ultrasound

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Ultrasound

Ultrasound is a test that uses reflected sound waves to produce an image of organs and other structures in the body. It does not use X-rays or other types of possibly harmful radiation.

For ultrasound testing, gel or oil is applied to the skin to help transmit the sound waves. A small, handheld instrument called a transducer is passed back and forth over the area of the body that is being examined. The transducer sends out high-pitched sound waves (above the range of human hearing) that are reflected back to the transducer. A computer analyzes the sound waves and converts them into a picture that is displayed on a TV screen. The picture produced by ultrasound is called a sonogram, echogram, or ultrasound scan. Pictures or videos of the ultrasound images may be made for a permanent record.

Ultrasound is most useful for looking at organs and structures that are either uniform and solid (such as the liver) or fluid-filled (such as the gallbladder). Mineralized structures (such as bones) or air-filled organs (such as the lungs) do not show up well on a sonogram.

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Author	Jan Nissl, RN, BS
Editor	Susan Van Houten, RN, BSN, MBA
Associate Editor	Tracy Landauer
Primary Medical Reviewer	Paul D. Traughber, MD - Radiology
Specialist Medical Reviewer	Kenneth B. Sutherland, CD, BSc, MD, FRCPC - Diagnostic Radiology
Last Updated	January 17, 2007

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Last updated:	January 17, 2007
Author:	Jan Nissl, RN, BS
Reviewed By:	Paul D. Traughber, MD - Radiology, Kenneth B. Sutherland, CD, BSc, MD, FRCPC - Diagnostic Radiology
Editors:	Susan Van Houten, RN, BSN, MBA, Tracy Landauer

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