A method includes continuously transmitting, with a transducer array, an ultrasound signal in one direction. The method further includes beamforming, with a beamformer, an echo signal received by the transducer array using on a predetermined apodization function. The echo signal is generated in response to an interaction of the ultrasound signal with flowing structure. The method further includes estimating, with a velocity processor, a vector velocity of the flow, including velocity components, as a function of depth and time from the beamformed echo signals using transverse oscillation vector velocity estimation. The method further includes generating, with a measurement processor, a quantitative measurement from the velocity components. The method further includes visually displaying, with a display monitor, the quantitative measurement.
