Hi,
You seem to have many questions about this which I think you'll find are answered in the following papers, the FSL Course material and the FSL wiki. I recommend that you look at this material as it can explain more than we can write in a few emails.
Papers:
Smith, Stephen M., Heidi Johansen-Berg, Mark Jenkinson, Daniel Rueckert, Thomas E. Nichols, Karla L. Miller, Matthew D. Robson et al. "Acquisition and voxelwise analysis of multi-subject diffusion data with tract-based spatial statistics." Nature protocols 2, no. 3 (2007): 499-503.
S.M. Smith, M. Jenkinson, H. Johansen-Berg, D. Rueckert, T.E. Nichols, C.E. Mackay, K.E. Watkins, O. Ciccarelli, M.Z. Cader, P.M. Matthews, and T.E.J. Behrens. Tract-based spatial statistics: Voxelwise analysis of multi-subject diffusion data. NeuroImage, 31:1487-1505, 2006.
All the best,
Mark
On 28 Jun 2014, at 03:38, SUBSCRIBE FSL Xinfa_Shi <[log in to unmask]> wrote:
> Hi,
>
> In my opinion ,brain segmentation should happen in the 4rd step (i.e. tbss_4_prestats 0.2) .As far as I know , the FA values of GM and CSF is generally lower than 0.2 while FA >0.2 in WM . So the threshold 0.2 achieved brain segmentation . Is it right ? If possible ,please tell me in detail .
>
> Regards .
>
> Shi Xin-Fa .
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