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Dear fsl experts, is there a minimum resolution necessary for successful segmentation? I understand that, using default settings, the output of the fast segmentation module is designated 0 (eg ~_FAi_brain_pve_0) for csf, 1 for gm, 2 for wm. When trying to analyze my T1-weighted images I get wm as 0 and csf as 2. Can anyone explain how this can happen? Does it reflect some segmentation failure? The gm-images do not look particularly well. The input is 79x95x79 (downsampled, space outside the head already stripped off, 2mm isotropic). Bet has been performed. I am actually aiming at fsl-vbm analysis of a larger set of such data and am afraid that this 'failing' segmentation may not give the best input for this purpose. Maybe the resolution is too low? Thanks & regards, Florian