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Hi - please see previous posts on this kind of question - we generally advise against comparing DTI data from different protocols, so I would recommend ignoring those subjects. Cheers. On 3 May 2010, at 15:48, Sophie Lafaille wrote: > brand new FSL user here. I have DTI Data. I have 22 subjects with > 128x128 and I have 3 subjects with 256x256. I'm planning on doing > TBSS and/o tractography. What can I use to downsample the 3 subjects > to 128x128, or do I even need to do this, or should I just exclude > those 3 subjects. > > thanks, sophie > > -- > Sophie Josee Lafaille, M.Sc. > Research Coordinator > Law and Mental Health Program > Specialty Clinics, 4th Floor, RM 440 > Centre for Addiction and Mental Health > 250 College Street, Toronto, Ontario, Canada > M5T 1R8 > > Office: 416-535-8501 Ext. 6278 --------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------