1. A 5-dimensional imaging method of a patient's heart, comprising: (a) in a patient free-breathing magnetic resonance imaging study of said patient's heart, a computer system acquiring 3-dimensional spatial information and concurrently recording cardiac and respiratory cycles of said patient, wherein said 3-dimensional spatial information is sampled with a non-Cartesian 3-dimensional k-space readout trajectory which is incorporated into a magnetic resonance imaging sequence, wherein said acquisition comprises a plurality of acquisition segments of a plurality of readouts of said heart, whereby each segment is repeated multiple times to cover at least a full period of a cardiac and respiratory cycle of said patient; and (b) for each cardiac and respiratory temporal phase combination in said recorded cycles said computer displaying 3-dimensional volumetric measurements of the atria and ventricles of said patient's heart and the rate of change of these volume measurements with respect to said cardiac and respiratory cycles.