Doppler

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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 ?
For example, when determining a suspect lesion for CaP risk, a 1999 study concluded that areas of increased color Doppler flow are 4.
For women with a positive transvaginal color Doppler, additional imaging, such as saline-infusion sonohysterography, is not necessary for confirmation before proceeding to definitive management with hysteros-copy," she said.
History, physical examination and color Doppler results were analyzed.
Franchi-Abella also stressed the very fast acquisition speed of UltraFast Doppler, which combines Color Doppler and Pulsed Wave Doppler.
Covered are bleeding in pregnancy and during the reproductive and menopausal years, fetal and congenital anomalies and malformations of different body systems, color Doppler and 3D ultrasound in the assessment of pregnancy complications and anomalies, and adnexal, uterine, and cervical lesions.
The normal and abnormal scrotum in children: evaluation with color Doppler sonography.
Backed by its pioneering S8 color Doppler system and its portfolio of cost-effective, portable and cart based ultrasound systems including the SSI-1000, the company has registered double digit growth in European markets since 2004.
Color Doppler imaging depicted no internal or capsular flow (Figure 1C).
Particularly for readers new to ultrasound, but also more experienced practitioners who need an occasional reminder, Schmidt explains the theory and practice of clinical sonography then offers a large collection of B-mode scans, a number of color Doppler images, and several examples of contrast-enhanced sonography.
The patients were all diagnosed with single umbilical artery from 1994 to 2005 using color Doppler imaging around the fetal bladder.