Hi - if I understand you correctly, in fact this is due to a real
improvement in the latest version: the only voxels where cross-
subject comparisons can be valid are those which are present in all
subjects after registration. It is not strictly valid to run the GLM
in randomise for voxels which don't have data from all subjects. The
latest version of TBSS enforces this, and hence you appear to have a
reduced working field-of-view. Hope that answers things?
Cheers, Steve.
On 2 Nov 2007, at 12:53, Stefan Rueckriegel wrote:
> When registering images to target FMRIB58_FA each image in all_FA as
> well as
> mean_FA lack great brain areas.
> Many of the original images have a lack of top slices, registration
> does not
> account for that? Still the problem also occurs in inferior slices.
> Furthermore brain-sizes are quite variable (6y-20y old subjects).
>
> Using your "old style" (formerly recommended) n x n registration in
> FSl 3.3
> registration was fine, voxels were not deleted, i.e. extend of each
> brain in
> all_FA differed a bit due to their lacking slices (in contrast to the
> FMRIB58_FA registration: extend of each partly-registered img in
> all_FA is
> exactly the same).
> Any solutions for a whole brain registration to FMRIB58_FA?
>
> Cheers,
> Stefan
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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)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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