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A new ultrasound Doppler technique for obtaining calibrated 3D flow velocity information is reported. Theoretical expressions are derived for the expected Doppla shift and the spectral spread under a variety of flow conditions. Experimental results using a revolv-) ing turntable demonstrated the linearity of velocity detection, the ability to resolve an arbitrary velocity vector, and conrimed the theoretical predictions of spectral spread.
M.D. Fox (Fri,) studied this question.