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Hi Tudor, Not sure, but I think randomise needs 4D file (containing all preprocessed subject files )as input for working. Is this the case for your all diff strut...file? Best regards, Rosalia. El 26/06/2013 18:40, "Tudor Popescu" <[log in to unmask]> escribió: > Dear experts, > > I ran the following randomise command, from my /VBM/stats/ folder, after > having done all the VBM pre-processing: > > *randomise -i all_diff_struc_GM_to_template_GM_mod.nii.gz -m GM_mask -o > fslvbm -d design.mat -t design.con -T -n 5000* > > The file all_diff_struc_GM_to_template_GM_mod.nii.gz has been calculated > with fslmaths and looks fine when viewed in fslview's Movie Mode. Still, I > get the error: > > *ERROR: Could not open image all_diff_struc_GM_to_template_GM_modTrace: > read_volume4DROI.* > > Although I know randomise needs to be run from /stats/, I tried running > the same command from one folder level up (/VBM/), but then it says: > > *ERROR: Could not open image GM_mask* > > Can anyone suggest what could be wrong? Thanks! > > Tudor >