1. A data reconstruction method, comprising the steps of: accessing a three-dimensional (3D) data set, the 3D data set comprising two-dimensional (2D) velocity images; and directionally interpolating, by a computer, between the 2D velocity images to generate a 2D intermediate velocity image, wherein the step of directionally interpolating comprises the step of determining a motion field based on divergence information associated with the 2D intermediate velocity image.