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A 2D blood velocity estimator is presented combining speckle tracking (ST) and phase-shift estimation (PE) to measure lateral (vx) and axial (vz) velocities respectively. Estimator properties were assessed in a computer model of a carotid bifurcation using ultrasound simulations based on computational fluid dynamics, allowing validation towards a ground truth. Simulation results were supported with in-vivo data of a healthy carotid. ST and PE estimates were combined as: 1) vx from 2D-ST and vz from PE, 2) vx from 2D-ST and vz from PE with aliasing correction based on ST, 3) vz from PE and only lateral ST for vx. Regression analysis showed a 35-77 % decrease in standard deviation for vz for PE compared to ST. Aliasing correction based on ST improved results but also introduced spurious artifacts. A marginal decrease in performance was observed when only tracking laterally.