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Medical Term:


Pronunciation: ŭl′tră-sŏ-nog′ră-fē

Definition: The location, measurement, or delineation of deep structures by measuring the reflection or transmission of high frequency or ultrasonic waves. Computer calculation of the distance to the sound-reflecting or absorbing surface plus the known orientation of the sound beam gives a two-dimensional image.

Synonym(s): echography, sonography

[ultra- + L. sonus, sound, + G. graphō, to write]

See Also: ultrasound