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- W102286054 abstract "Duplex sonography combines the ability to real time image the carotid artery and accurately sample the vessel using pulsed Doppler. The flow information is presented graphically as velocity vs. time (Figure 8.1). It has become possible to color encode the velocity information and superimpose this upon the 2D gray-scale image — color flow Doppler. The color of each pixel displayed is the mean velocity and not peak velocity. It is standard practice that color flow Doppler is used quickly to locate and identify vessels and areas of turbulence; pulsed Doppler is then used to quantify flow accurately (Figure 8.2). ‘Power flow’ Doppler is a more recent development that analyzes the amplitude of the returning signal rather than frequency and direction. The signal is sensitive to flow, has a high signal to noise ratio and is less dependent upon the angle of insonation than pulsed or color flow Doppler. However, the image does not produce information on either peak velocity or direction of flow and is one of anatomy rather than function." @default.
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- W102286054 date "1996-01-01" @default.
- W102286054 modified "2023-09-26" @default.
- W102286054 title "The investigation of extracranial carotid disease" @default.
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- W102286054 doi "https://doi.org/10.1007/978-94-011-5406-2_8" @default.
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