1. A method for correcting MRI image distortion, in which a distortion correction procedure is carried out on an acquired MRI image data set of a body region by graphical data processing, characterised in that: after the MRI image data set has been acquired, its distortion is determined by carrying out an image registration process for registering the acquired MRI image data set to a previously available, less distorted or undistorted image data set of substantially the same body region; a transformation is determined from the image registration process; and by applying the transformation to the MRI image data set, its distortion is corrected.