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Hi, try "invwarp" (assuming you have the warp T1->MNI, for example). See: http://www.fmrib.ox.ac.uk/fsl/fnirt/warp_utils.html#invwarp <http://www.fmrib.ox.ac.uk/fsl/fnirt/warp_utils.html#invwarp> Cheers- Andreas ________________________________ Von: FSL - FMRIB's Software Library im Auftrag von Michael Scheel Gesendet: Di 18.11.2008 23:35 An: [log in to unmask] Betreff: [FSL] fnirt inverse Hi fsl-experts, is there a way to find some sort of 'inverse matrix' in fnirt? I have made a FA map comparison between controls and one particular patient and want to project an interesting difference that I found onto the subjects T1 anatomical scan. I know how I would do it with flirt but not with the nonlinear character of the fnirt warp results. Thanks, Michael