A system acquires frequency domain components representing MR image data. An RF coil emits RF pulses for use in acquiring multiple individual frequency components corresponding to individual data elements in a 3D storage array in which the individual frequency components are successively acquired along radii from a designated center representing an origin to a boundary of the storage array. Angles of successive radii with respect to the origin are successively changed to substantially fill the storage array volume during acquisition of an MR dataset representing an MR image. A computation processor determines the angles of successive radii with respect to the origin, in response to data representing a reduction in at least one dimension of the 3D imaging volume represented by the storage array. A storage processor stores individual frequency components, acquired using the emitted RF pulses, in corresponding individual data elements in the array.