Hi Branka,
I assume you're trying to flip by changing the headers (e.g. sform
matrix) and SPM is noticing this and complaining.
Just flip the image, without changing the headers and things should be
okay. You might want to look in this thread for info on this:
http://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0606&L=SPM&P=18538
Best,
Ged.
Branka Milivojevic wrote:
> Hi,
>
> I want to assess a task by hemisphere interaction, so I was going to
> flip the images and introduce hemisphere as a factor.
>
> But when I flip the images, I get an error from the
> spm_check_orientations. If I de-activate that part of the code, I can
> run the analysis, but it looks like SPM5 has flipped the images back to
> the original orientation because I get no differences between hemispheres.
>
> Am I doing something wrong?
>
> Is there an easy way to change the sign of the voxel size?
>
> Thanks in advance!
> Branka
>
> Branka Milivojevic
> PhD candidate
> Department of Psychology
> University of Auckland
> Private Bag 92019
> Auckland
> New Zealand
> Ph: (+649) 373 7599 ext. 88636
> Fax: (+649) 3737450
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