No, there isn't, although if you have an image with the same voxel-to-world mapping, you can copy it from one header to another. Best regards, -John On Thu, 4 Apr 2019 at 00:42, Sara Ponticorvo <[log in to unmask]> wrote: > Hi SPM experts, > I performed a coregistration via coregister (estimation) on some fmri > data. I suppose the transformation matrix is saved in the nii header (as > explained in the manual). Now I'm wondering if there is a way to delete > such transformation in order to get the original nii file. > Thanks a lot > > Sara > -- Prof John Ashburner Professor of Imaging Science UCL Institute of Neurology Queen Square Wellcome Trust Centre for Neuroimaging University College London 12 Queen Square, London, WC1N 3BG E: [log in to unmask] T: +44 (0)20 3448 4365 http://www.fil.ion.ucl.ac.uk/