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A method of performing three-dimensional (3-D) velocity vector estimation with two transducers is demonstrated on a flow phantom using the Doppler spectra's mean frequencies and bandwidths. The results are compared with 3-D vector estimates computed from Doppler mean frequencies obtained with a five-transducer system. It is shown that the two-transducer vector Doppler system which uses bandwidth can improve on the accuracy of a three-transducer vector Doppler system which relies only on Doppler mean frequencies.
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