1. A method of measuring three-dimensional motion of an object by magnetic resonance imaging from one acquired image orientation, comprising: applying a magnetic resonance imaging pulse sequence to spatially modulate a region of interest of said object without the use of out-of-plane tags, the pulse sequence comprising a slice-following CSPAMM (complementary spatial modulation of magnetization) pulse sequence for encoding in-plane positions with added z-phase encode for encoding through-plane positions of points within the region of interest; acquiring a set of one or more vertically tagged images and a set of one or more horizontally tagged images of said spatially modulated object, wherein the acquired sets of vertically and horizontally tagged images comprise both in-plane and through-plane encodings; extracting a set of displacement-encoding phase maps from the acquired sets of vertically and horizontally tagged images; and determining in-plane and through-plane motions of said spatially modulated object based on the displacement-encoding phase maps, thereby generating a three-dimensional motion map of the points within the region of interest of said object.