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Hi - yes, if you are just doing the first reversal stage, then indeed there is no warping involved. It is still possible that the number of voxels will change very slightly - for example, two skeleton voxels might occasionally point to the same point off the skeleton. Cheers. On 21 Feb 2012, at 16:37, Shengwei Zhang wrote: > Hi Prof. Smith, > > Just curious if I'm correct to interpret the warping you mentioned as the nonlinear registration (i.e. fnirt). > Is there any warping involved during the skeleton (de)projection? > I meant I had decreased number of voxels after the deprojection to the nonlinearly-aligned FA, not the native FA. > > Thanks again in advance, > Shengwei > --------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------