Hi,
yes, the idea is that you're dealing here with _vectors_ so 3D entities, not scalar ones (hence the 28x3 when you split it, each V1 map being 4D with 3 components corresponding to the x, y and z projections of V1 on the 4th dimension)... I don't think you can use tbss_non_FA on those maps as we can't apply fnirt warpfield to vectors yet (Saad/Steve, am I right?).
Hope this helps,
Gwenaëlle
--- En date de : Jeu 13.11.08, Juergen Haenggi <[log in to unmask]> a écrit :
> De: Juergen Haenggi <[log in to unmask]>
> Objet: [FSL] Tbss_non_FA and eigenvectors
> À: [log in to unmask]
> Date: Jeudi 13 Novembre 2008, 21h45
> Dear FSL experts
>
> After running tbss_non_FA on the first eigenvector there is
> a file in the
> stats folder called all_V1.nii.gz that is three times
> larger in size than
> the other files derived from the same kind of analysis (MD,
> L1, L2, L3).
> When using fslsplit in order to do statistics elsewhere,
> there are "84
> subjects" (individual files) although only 28 subjects
> were included in the
> initial FA analysis. When I split up the file
> all_L1.nii.gz, there are 28
> subjects.
> The same is also true for all_V2.nii.gz and V3.nii.gz.
>
> Any idea?
>
> Thanks in advance
> Regards
> Juergen
>
> -----------------------------------------------------------
> Juergen Haenggi
> Ph.D. (Dr. des.)
> Division of Neuropsychology
> Institute of Psychology
> University of Zurich
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> 8050 Zurich, Switzerland
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> -----------------------------------------------------------
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