Abstract
Real-time assessment of the flow patterns of the vessels, especially in peripheral ones, can be done very accurately and noninvasively using Doppler ultrasound. The Doppler effect is the change in frequency of a wave due to movement of the source or observer. In sonography, the ultrasound is sent by a stationary transducer to a moving target (blood). The ultrasound beam reflected by moving red blood cells show an increase in frequency when the blood flow is directed toward the transducer and a decrease in frequency as it moves away. The change in the ultrasonic frequency from its transmission to reception of the echoes is directly proportional to the velocity of the blood. Frequency changes are interpreted as different flow velocities and directions.KeywordsInternal Carotid ArteryDeep Venous ThrombosisRenal Artery StenosisPeak Systolic VelocityFalse LumenThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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