Hi,
if you are really absolutely sure you need to do this you could get the
orientation from your file using spm_vol and change it so that the voxel
dimensions are the same. However, there will still be a bias re: spatial
normalization as flipped images will have to be deformed more (the brain
is not symmetrical), which is why it is recommended that if you flip
some and not others, you do that in native space and then normalize to a
symmetrical template.
Hope this helps,
Marko
Youngbin Kwak wrote:
> Hi all,
> I'm trying to run 2nd level analysis with statistical maps that are in
> different orientation. That is, I have flipped the left/right
> orientation in couple subjects and combined with the non-flipped subject
> data in the analysis. I'm using SPM5 and when I tried to run, it gave
> the following error message.
> ??? Error using ==> spm_check_orientations at 32
> The orientations etc must be identical for this procedure.
> Is there any way to make this happen through SPM?
> Thanks in advance for your help!
> Youngbin
>
> --
> Youngbin Kwak M.S.
> Ph.D. candidate, Neuroscience Graduate Program
> Cognitive Science & Cognitive Neuroscience Program
> University of Michigan
--
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Marko Wilke (Dr.med./M.D.)
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Universitäts-Kinderklinik University Children's Hospital
Abt. III (Neuropädiatrie) Dept. III (Pediatric neurology)
Hoppe-Seyler-Str. 1, D - 72076 Tübingen
Tel.: (+49) 07071 29-83416 Fax: (+49) 07071 29-5473
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