Doppler


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Related to Doppler: Doppler effect

Dopp·ler

(dop'lĕr),
Johann Christian, Austrian mathematician and physicist, 1803-1853. See: Doppler echocardiography, Doppler effect, Doppler phenomenon, Doppler shift, Doppler ultrasonography.

Dop·pler

(dop'lĕr),
A diagnostic instrument that emits an ultrasonic beam into the body; the ultrasound reflected from moving structures changes its frequency (Doppler effect). Of diagnostic value in peripheral vascular and cardiac disease.

Doppler

/Dop·pler/ (dop´ler) see under ultrasonography.

Dop·pler

(dop'lĕr)
A diagnostic instrument that emits an ultrasonic beam into the body; the ultrasound reflected from moving structures changes its frequency (Doppler effect). Of diagnostic value in peripheral vascular and cardiac disease.

Doppler

The Doppler effect refers to the apparent change in frequency of sound wave echoes returning to a stationary source from a moving target. If the object is moving toward the source, the frequency increases; if the object is moving away, the frequency decreases. The size of this frequency shift can be used to compute the object's speed—be it a car on the road or blood in an artery. The Doppler effect holds true for all types of radiation, not just sound.
Mentioned in: Abdominal Ultrasound

Doppler

an Austrian physicist and mathematician.

duplex Doppler imaging
Doppler effect
the relationship of the apparent frequency of waves, as of sound, light and radio waves, to the relative motion of the source of the waves and the observer, the frequency increasing as the two approach each other and decreasing as they move apart.
The Doppler effect can be experienced when a train whistle or automobile horn produces a continuous sound as it approaches and passes a listener. The pitch of the sound suddenly falls as the source passes the listener.
Doppler shift
the change in frequency that occurs when high frequency sound waves are reflected from a moving surface; the basis for doppler ultrasound.
References in periodicals archive ?
Hence, it has motivated to undertake the present study to evaluate the fetal growth with color Doppler velocimetry in normal and high-risk pregnancies.
All patients were examined on essaotae AU3 color Doppler machine with 3.
Color flow Doppler based on the Doppler phenomenon calculates difference in frequency of emission and reception of an ultrasound beam reflecting moving RBCs inside the vessels and providing color images of vessels10.
In this group of patients, preoperative Doppler studies were correlated with post-operative biopsy.
1,2 As measuring HVPG is an invasive procedure, alternative methods, as observing hepatic vein Doppler waveform, are also being studies in cirrhotic and non cirrhotic patients.
The Doppler Effect, after all, isn't a word one tries to fit into a sentence most days.
Founded in 2013, Doppler Labs is on a mission to create wearable technology that makes computing more immersive and human.
The 1-4th order Doppler parameter calculation expressions are then advanced.
Recent developments and continuing refinement in color doppler imaging techniques have made possible high-quality color doppler sonography for showing blood flow and local hemodynamics in various organs.
11-13 Continuing studies on hepatic vein led to focus on doppler hepatic vein waveform and then on comparison of doppler waveform of hepatic vein and HVPG14-18 This comparison showed that HVPG is closely related to doppler hepatic vein waveform which are labelled classically as 'triphasic', 'biphasic' and 'monophasic'.
Science Secretary Mario Montejo made this assurance after the Department of Science and Technology (DOST) signed a deal with the Department of National Defense to establish the weather bureau's latest Doppler radar station at the naval base in Romulo Espaldon, Lower Calarian.
Doppler spectrum of microwave signal backscattered from oceanic surface reflects the distribution of the power-weighted line-of-sight velocity of the scattering facets and carries more information on the sea state than does the radar cross section (RCS).