Medical Definition of Doppler ultrasound
Doppler ultrasound: A form of ultrasound that can detect and measure blood flow. Doppler ultrasound depends on the Doppler effect, a change in the frequency of a wave resulting here from the motion of a reflector, the red blood cell.
There are several kinds of Doppler ultrasound:
Color Doppler depicts blood flow in a region and is used as a guide for the placement of the pulsed Doppler gate for more detailed analysis at a particular site.
Doppler ultrasound has many applications including, for example, the detection and measurement of decreased or obstructed blood flow to the legs. Color Doppler ultrasound is done first to evaluate vessels rapidly for abnormalities and to guide placement of the pulsed Doppler to gain sample volume for detailed analysis of velocities.
Named for Christian Johann Doppler (1803-1853), the Austrian physicist, who discovered the effect that now bears his name.
Last Editorial Review: 1/25/2017
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