1. A method for reducing scan time in dynamic magnetic resonance (MR) imaging, the method comprising: acquiring a randomly under-sampled k-space with an Echo-Planar Imaging (EPI) pulse sequence technique; and reconstructing the under-sampled k-space utilizing a constrained reconstruction technique, wherein a center of the k-space is acquired first with linear ordering and then an outer k-space is acquired using radial profile ordering, wherein linear ordering comprises line-by-line ordering, and wherein radial ordering comprises acquiring a first line from the center of the k-space to the outer k-space and acquiring subsequent lines from the center of the k-space to the outer k-space in a continuous rotation.