This disclosure relates to a method, article of manufacture, and apparatus for fast 2D blood flow velocity ultrasound imaging. In embodiments, this includes generating beam data representing a plurality of beams formed in a plurality of transmit events, wherein each of the plurality of transmit events is associated with a transmit event index, each beam is associated with a beam index, and the beam data is associated with the transmit event index, the receiving beam index, and a repeat index； calculating positions within a region of interest based on the beam data； processing the beam data to derive velocities, wherein each of the velocities is associated with the transmit event index and the receiving beam index； grouping the velocities； and for each group, calculating an angle component of a 2D velocity vector, and calculating an amplitude component of the 2D velocity vector.
