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What’s So Hard About Adding Doppler to Ultrasound? (.PDF Download)

We have all heard the change in pitch when an ambulance or police car drives by with its siren blaring. The pitch is higher as the vehicle comes toward you, and shifts to a lower pitch as it goes away from you. This is called the Doppler effect, named after Christian Doppler, who came up with the idea in 1842. To hear this effect best...

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