Doppler ultrasound

Doppler ultrasound
a diagnostic technique that utilizes the fact that the frequency of sound or light waves changes when they are reflected from a moving surface (the Doppler effect). It is used to study the flow in blood vessels and the movement of blood in the heart. The frequency detector may be part of an ultrasound imaging probe, which displays an image of the anatomy on a monitor. Simultaneously the Doppler signal from a particular point on the ultrasound image can be displayed next to the anatomical position using a split screen (duplex imaging). Using electronic techniques, direction and velocity of blood flow can each be allocated different colours and displayed on a colour monitor over the anatomical image (colour flow ultrasound imaging). Power Doppler, a modification of this technique, is more sensitive at detecting flow but does not give information on direction of flow [J. Doppler (1803–53), Austrian physicist]

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  • Doppler ultrasound — n ultrasound that utilizes the Doppler effect to measure movement or flow in the body and esp. blood flow called also Doppler ultrasonography * * * a diagnostic technique that utilizes the fact that the frequency of ultrasound waves changes when… …   Medical dictionary

  • doppler ultrasound — noun or doppler ultrasonography Usage: usually capitalized D : ultrasound that utilizes the Doppler effect to measure movement or flow in the body and especially blood flow …   Useful english dictionary

  • Doppler ultrasound — /dɒplə ˈʌltrəsaʊnd/ (say dopluh ultruhsownd) noun an ultrasound test for the flow of blood in a blood vessel using a handheld transducer passed lightly over the skin, as for detecting deep vein thrombosis. {See doppler} …  

  • Doppler ultrasonic flowmeter — Doppler ultrasound flowmeter a flowmeter that is sensitive to the Doppler effect, such as measuring blood flow by noting the Doppler effect in ultrasonic waves reflected off moving red blood cells. Called also ultrasonic or ultrasound Doppler f …   Medical dictionary

  • Doppler echocardiography — n Doppler ultrasound used to measure cardiovascular blood flow velocity for diagnostic purposes (as for evaluating valve function) * * * an echocardiographic technique that records the flow of red blood cells through the cardiovascular system by… …   Medical dictionary

  • Ultrasound, Doppler — 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… …   Medical dictionary

  • Doppler effect — Change of wavelength caused by motion of the source. An animation illustrating how the Doppler effect causes a car engine or siren to soun …   Wikipedia

  • Ultrasound — Not to be confused with Supersonic .Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy,… …   Wikipedia

  • Doppler — Johann Christian, Austrian mathematician and physicist, 1803–1853. See D. echocardiography, D. effect, D. phenomenon, D. shift, D. ultrasonography. A diagnostic instrument that emits an ultrasonic beam into the body; the ultrasound reflected from …   Medical dictionary

  • Doppler — Contents 1 Doppler effect and its applications 2 People 3 Other 4 …   Wikipedia

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