Dear Graham,
> I notice that the documentation describes the template images supplied with
> SPM as, approximate to the space described in the atlas of Talairach and
> Tournoux (1988). I was just wondering how 'approximate' they are and
> whether or not the co-ordinates provided by SPM should be reported as being
> 'Talairach'. For example, we are interested in the fusiform gyrus and it
> seems to me that the co-ordinates provided by SPM are about 2-4mm inferior
> compared to the Talairach atlas.
Matthew Brett has posted a helpful discussion of MNI/Talairach differences
at http://www.mrc-cbu.cam.ac.uk/Imaging/mnispace.html that I think will
answer your queries. The bottom line in terms of reporting is to reference
activation loci to the surface anatomy of that individual subject if in
doubt.
> Another (unrelated) question: Is it possible to specify a voxel size for
> reslicing. I know this can done via the default button for spatial
> normalisation. I would like to be able to coregister a T1 with the mean
> epi and then reslice while maintaining the original voxel size of the T1.
If you change the voxel size in this way I believe that the voxel size for
coreg/reslice will also be changed, allowing you to reslice at the smaller
voxel size.
best wishes,
Geraint
--
Dr. Geraint Rees
Wellcome Advanced Fellow, Lecturer,
Division of Biology 139-74, Institute of Neurology,
California Institute of Technology, University College London,
Pasadena CA 91125 London WC1N 3BG
voice 626-395-2880 020-7833-7472
fax 626-796-8876 020-7813-1420
web http://www.klab.caltech.edu/~geraint
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