Sylvain,
I think creating new templates by removing parts of the brain that
you don't have from the existing ones will help.
A better option would perhaps be to create a mask (weighting image)
that will allow you to exclude the missing part from the calculations,
more info on this in the SPM help facility.
I suspect you are using nonlinear alignment so reducing the number
of basis functions you are using will also help.
Emmanuel
Sylvain Clément wrote:
>
> Dear SPM list members,
>
> I like to normalize T1 & EPI images (30sl, 3.6x3.6x4mm of voxel size) in
> which some part of the brain are missing because of morphological reasons
> (inférior part of cerebellum is often missing). If normalize these images
> to the SPM templates (T1 to T1 template, EPI to EPI template) there are
> distortions in the normalized images: the missing part is filled
> (surrounding parts are warped).
>
> How can I avoid the distortions ? Is there parameters to adjust? Or should
> I create "new templates" from the existing ones that do not include the
> missing part ?
>
> Thanks in advance
>
> Sylvain Clément
>
> ---------------------------
> Sylvain Clément
> Bordeaux, FRANCE
> mailto:[log in to unmask]
--
______________________________________________________________
Emmanuel A Stamatakis PhD Tel: +44 (0) 1786 467 669
Research Fellow Fax: +44 (0) 1786 467 641
Dept of Psychology e-mail: [log in to unmask]
University of Stirling
Stirling FK9 4LA
U.K. http://jura.stir.ac.uk/~stamatak/
|