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Hi - I would just try to get them "just right", and small deviations hopefully shouldn't matter. Cheers. On 20 Dec 2011, at 06:36, Josselin Houenou wrote: > Dear all, > I am using another software (brainvisa) to build my FA maps. > It does not do perfect brain masks which are either too large or a little too tight, eroding some cortical regions. > What do you recommend for FA maps to be fed into TBSS? Too large FA maps, including non-brain voxels or too tight FA maps, eroding some cortical regions ? > Thanks, > Josselin Houenou > --------------------------------------------------------------------------- Stephen M. Smith, Professor of Biomedical Engineering Associate Director, Oxford University FMRIB Centre FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) [log in to unmask] http://www.fmrib.ox.ac.uk/~steve ---------------------------------------------------------------------------