Vector Doppler Imaging (VDI) improves on conventional Color Doppler Imaging(CDI) by giving speed and direction of blood flow at each pixel of a displaygenerated by acomputing system. Multiple angles of Plane wave transmissions (PWT) via anultrasoundtransducer conveniently give projected Doppler measurements over a wide fieldof view,providing enough angular diversity to identify velocity vectors in a shorttime window whilecapturing transitory flow dynamics. A fast, aliasing-resistant velocity vectorestimator forPWT is presented, and VDI imaging of a carotid artery with a 5 MHz lineararray is shownusing a novel synthetic particle flow visualization method.