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Just figured this out myself, the best answer is AFNI’s 3dresample: 3dresample \ -master $FSLDIR/data/standard/MNI152_T1_1mm.nii.gz \ -prefix someMaskOrParameter_1mm.nii.gz \ -inset someMaskOrParameter_2mm.nii.gz From: <Yang>, Daniel Yang <[log in to unmask]<mailto:[log in to unmask]>> Reply-To: "[log in to unmask]<mailto:[log in to unmask]>" <[log in to unmask]<mailto:[log in to unmask]>> Date: Monday, July 7, 2014 at 11:47 AM To: "[log in to unmask]<mailto:[log in to unmask]>" <[log in to unmask]<mailto:[log in to unmask]>> Subject: [FSL] visualize 2mm ROI in 1mm space Dear FSL users, If given a 2mm ROI, how would you visualize it in 1mm space? A related question is, how to preserve the voxel sizes if the solution involves some conversion? That is, the ROI dimension in terms of mm^3 by fslstats –V? Many thanks, Daniel