1. A method to generate magnetic resonance (MR) angiography images of a predetermined three-dimensional volume segment of a living subject, comprising: operating an MR data acquisition unit, in which a living subject is located, to acquire MR data from a predetermined three-dimensional volume segment of the subject, and entering the acquired MR data into k-space along multiple radial trajectories in k-space; in a processor, automatically analyzing the MR data entered into k-space in order to subdivide said MR data entered into k-space into a plurality of groups, each group comprising only MR data acquired during a predetermined heartbeat phase of the heart of the subject; and in said processor, generating an MR angiography image using only MR data from a selected one of said of groups.