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It's in the manual….. http://fsl.fmrib.ox.ac.uk/fsl/fslwiki/TBSS/UserGuide?highlight=%28all_FA_symmetrised_skeletonised%29#Testing_left_vs._right_in_TBSS On 12 Sep 2013, at 03:17, zhang mingxia <[log in to unmask]> wrote: > Dear FSL experts, > > I see tbss_sym can be used to test left vs. right. Now I want to calculate (left-right)/(left+right) in TBSS. > > I think I should: > > (1)flip all_FA_symmetrised_skeletonised and add together the former and the latter; How to flip all_FA_symmetrised_skeletonised? I used fslswapdim -x y z all_FA_symmetrised_skeletonised. But I checked the original x y z and "flipped" -x y z, The values are not the same. > > (2) zero the left half of this dataset (corresponding to the "right" side of standard space); How to zero one hemisphere? > > (3) the dataset from (2) divided by all_FA_skeletonised_left_minus_right. > > Thanks for your help. > > Mingxia Zhang --------------------------------------------------------------------------- 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