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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 



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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)
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