I do not understand how the Doppler effect works for ultrasound. Thanks.

The Doppler effect is being used to evaluate the velocity and direction of blood flow in the human body. The transducer transmits ultrasound waves at a certain frequency. When the beam reflects back from a moving object such as blood cells, the reflected wave will have higher frequency than the transmitted one if the blood is flowing toward the transducer, and lower frequency if the blood is traveling away from the transducer.

By measuring this change in frequency we can calculate the velocity and the direction of the flow. Please follow this link for more information http://en.wikipedia.org/wiki/Doppler_effect

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