Doppler ultrasound


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Doppler ultrasound

An imaging technique using ultrasound that can detect moving liquids.
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Doppler ultrasound

that in which measurement and a visual record are made of the shift in frequency of a continuous ultrasonic wave proportional to the blood-flow velocity in underlying vessels; used in diagnosis of extracranial occlusive vascular disease. It is also used in detection of the fetal heartbeat or of the velocity of movement of a structure, such as the beating heart.

color flow Doppler ultrasound
a form of pulse wave Doppler in which the energy of the returning echoes is displayed as an assigned color; by convention echoes representing flow towards the transducer are seen as shades of red, and those representing flow away from the transducer are seen as shades of blue. The color display is usually superimposed on the B-mode image, thus allowing simultaneous visualization of anatomy and flow dynamics.
continuous wave Doppler ultrasound
a technique in which the transducer emits and receives the ultrasound beam continuously, enabling the measurement of high velocity blood flow, such as occurs through heart valve stenoses.
duplex Doppler ultrasound
a form of image display in which both spectral and color flow images are seen simultaneously. This facilitates accurate anatomical location of the blood flow under investigation.
Doppler ultrasound flowmeter
a device for measuring blood flow that transmits sound at a frequency of several megahertz downstream along the flowing blood. Some of the sound waves are reflected by the moving red blood cells back toward the transducer. The difference in pitch between the transmitted and reflected sounds is produced as an audible tone and is proportional to the velocity of blood flow. The flowmeter can be incorporated into a stethoscope so that qualitative and quantitative measurements of the flow of blood through arteries and veins can be obtained. The Doppler flowmeter is capable of recording very rapid pulsatile changes in flow as well as steady flow.
pulse wave Doppler ultrasound
a technique in which the transducer emits ultrasound in pulses. Blood flow velocities so measured are limited to around the physiologic range (up to approximately 1.5 meters/second) but the depth from which the returning echoes originate can be accurately determined.
spectral Doppler ultrasound
a form of ultrasound image display in which the spectrum of flow velocities is represented graphically on the Y-axis and time on the X-axis; both pulse wave and continuous wave Doppler are displayed in this way.
References in periodicals archive ?
5% cases confirmed by FNAC while color flow Doppler ultrasound diagnosed 13.
Incomplete torsion initially results in venous compromise which can be seen on Doppler ultrasound as an elevated resistive index and elevated velocity at the main renal artery anastomosis [4].
The present study is carried out to evaluate the clinically suspected cases of scrotal lesions, the sensitivity and specificity of color Doppler ultrasound and to differentiate between benign and malignant masses.
On the basis of Doppler ultrasound findings, 106 (82.
Clinical Doppler Ultrasound systems have been used clinically in two ways.
Fetal and umbilical Doppler ultrasound in high-risk pregnancies.
An alternative method is to use a fetal heart rate monitor with a Doppler ultrasound probe to detect the fetal heart.
In 1978, La Grange, Foster and Pretorius first simplified the brachial plexus block via the supraclavicular approach using a colour Doppler ultrasound device for detecting the position of the axillary artery: they reported virtually no complication and a 98% success rate without complications in 61 patients (3).
CHICAGO -- Most adnexal tumors can be classified as benign or malignant by transvaginal gray-scale ultrasound and Doppler ultrasound based on the use of 10 simple rules, according to a prospective multicenter study of 1,938 patients.
In most cases PAD can be confirmed by measuring the ankle-brachial pressure index (ABPI), often by Doppler ultrasound.