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Definition of Ultrasound

Ultrasound: High-frequency sound waves. Ultra-sound waves can be bounced off tissues by using special devices. The echoes are then converted into a picture called a sonogram. Ultrasound imaging allows an inside view of soft tissues and body
cavities without the use of invasive techniques. Ultrasound is often used to examine a fetus during pregnancy. There is no evidence that any danger occurs from ultrasound during pregnancy.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=11850
Last Editorial Review: 3/19/2012

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