Doppler ultrasound uses reflected sound waves to evaluate blood as it flows through a blood vessel. The sound waves bounce off blood cells in a motion that causes a change in the pitch of the sound, called the Doppler effect. If there is no blood flow, the pitch does not change
Duplex ultrasound combines Doppler and conventional ultrasound, allowing the radiologist to see the structure of blood vessels, how the blood is flowing through the vessels, and whether there is any obstruction in the vessels. Color Doppler produces a picture of the blood vessel, and a computer converts the Doppler sounds into colors overlaid on the image, representing information about the speed and direction of blood flow. Using spectral Doppler analysis1, the duplex scan images provide anatomic and hemodynamic information, identifying the presence of any stenosis or plaque in the vessels.
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