1. A method of producing an image of a scanned object corrected for artefacts introduced by unwanted motion of said object during the scan comprising the steps of; taking a scan k-space data set derived from the object scan, taking a reference k-space data set of the object, comparing the scan k-space data set and reference k-space data set to determine the extent of any motion occurring during the scan in the scan k-space data set, using the scan k-space data set and information on the extent of motion of the scan k-space data set to produce a motion corrected scan k-space data set, and using the corrected scan k-space data set to produce an image.