1. A magnetic resonance method for forming a fast dynamic image from a plurality of signals acquired by an array of multiple sensors wherein prior to imaging a sensitivity map of each of the sensors being provided, at least two adjacent sensors record signals originating from the same imaging position, which are being multiplied by the sensitivity factor of the respective sensor at the respective imaging position while the image intensity is calculated from the signals measured by the various sensors, the number of phase encoding steps being reduced from a full set, characterized in that prior to the formation of the fast dynamic image a normal magnetic resonance image with the fall set of phase encoding steps is acquired for each sensor, and a subset of phase encoding trajectories is extracted commensurate with the phase encoding trajectories obtained by the fast dynamic imaging and an image is reconstructed from the above-mentioned subset, the signals of the fast dynamic image and the signals of the reconstructed image being compared in order to obtain an estimate of the fold-over artefacts of the fast dynamic image, which signals of the fold-over artefacts are compensated in the signals obtained by the fast dynamic imaging.