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Hi - no, that's fine - as long as the brain extraction looks good in all subjects for TBSS it doesn't matter if that required different BET parameters. Cheers. On 20 May 2013, at 16:40, maria estanqueiro <[log in to unmask]> wrote: > Dear FSL users, > > I am preprocessing some DTI images to make a group analysis with TBSS. > > I wanted to ask you whether it is important, in the brain extraction step, to choose the same BET options for all the images. > > If I select for example different fractional intensity thresholds for different subjects will it have any impact in the subsequent analyses? > > Thanks in advance! --------------------------------------------------------------------------- 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 --------------------------------------------------------------------------- Stop the cultural destruction of Tibet