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.

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
References in periodicals archive ?
Then Doppler ultrasound examination of the uterine artery (UA) was performed during 2nd trimester at 20 weeks using a color Doppler system, Philips Envisor C, with a 3.5MHz convex probe.
To assess the relation between Umbilical artery Doppler indices and perinatal outcome in normal and high-risk pregnancies.
Doppler's wrangling with the outside world reads like a swift and precise whirlwind.
The station will air a 30-minute special at 7 tonight to officially launch the Doppler introduction.
The Doppler Effect is calculated to find which of the small-scale fading are affected the user speed scenario and which MCS are affected by the Doppler Effect.
Section 3 examines the signal spectrum based on the optimal detection criterion for a specific Doppler, and the waveform design algorithm is discussed.
Doppler spread is caused by the acoustic propagation that each path has an individual Doppler scale factor.
Non-invasive investigation of fetal circulation has become possible with the use of Doppler. [3] There are many causes of high-risk pregnancies.
The patients were divided into two groups based on UA Doppler indices at delivery:
We therefore chose to study the correlation of Doppler abnormalities in fetuses with suspected FGR delivered at 37 weeks' gestation at our institution in order to remove the confounding factor that gestational age has on interpretation of placental pathology and the bias toward more severe placental lesions that are seen in FGR fetuses that require preterm delivery.