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On 18/08/11 22:45, Catherine T Gambale wrote: > I used fsl_reg to align non-linearly an FA image to the FA template. Now I want to invert the transformations, both the .mat and the warp + .msf obtained by fnirt. Is there a way to do this without rerunning flirt and fnirt in the opposite direction of what I did originally? Stefano Marenco Hi To invert a flirt transformation, you can use convert_xfm with the -inverse option. For fnirt, there is inwarp for this: http://www.fmrib.ox.ac.uk/fsl/fnirt/warp_utils.html#invwarp hope, this helps, wolf