The shift in frequency produced when an ultrasound wave is echoed from something in motion. The use of the Doppler effect permits measuring the velocity of that which is being studied (e.g., blood flow in a vessel).
Figure: DOPPLER ULTRASONOGRAPHY
Doppler probe used on (A) dorsal pedis and (B) posterior tibial arteries
ultrasonography
Doppler ultrasonography is a sample definition found in
Taber's Medical Dictionary, 21st Edition.
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