Doppler ultrasonography

Doppler ultrasonography
ultrasonography in which the shifts in frequency between emitted ultrasonic waves and their echoes are used to measure the velocities of moving objects, based on the principle of the Doppler effect. The waves may be continuous or pulsed; the technique is frequently used to examine cardiovascular blood flow (Doppler echocardiography). See also color flow Doppler imaging, under imaging, pulsed wave Doppler u., and continuous wave Doppler u.

Medical dictionary. 2011.

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  • doppler ultrasonography — noun see doppler ultrasound …   Useful english dictionary

  • continuous wave Doppler ultrasonography — Doppler ultrasonography using two transducers, with one continually transmitting and the other continually recording the ultrasonic waves. It is used to record signals with very high velocities, such as occur in severely stenotic valves, but… …   Medical dictionary

  • pulsed wave Doppler ultrasonography — Doppler ultrasonography in which a single transducer alternately transmits and records ultrasonic waves. It can be used to determine the site of signal origin precisely but cannot record signals with high velocities. Cf. continuous wave Doppler u …   Medical dictionary

  • transcranial Doppler ultrasonography — a form of Doppler ultrasonography in which pulses of ultrasound are directed at vascular formations in the base of the skull, allowing measurements of blood flow velocity in the major basal intracranial arteries on a real time basis. Transcranial …   Medical dictionary

  • 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 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

  • 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 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 echocardiography — Intervention Mitral valve MeSH …   Wikipedia

  • 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

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