you renamed the files.... did you also rename the
corresponding .mat files for each subject? SPM looks
at the info in the .mat file first, and then the info
in the header of the file second. if you spatially
normalized in SPM the origin for each file is set in
the .mat file, and the .hdr file has the original
origin. This origin may differ from your control group
thus giving the error that you received.
Phil Greer
UPMC PET Facility
> From: Sean Colloby <[log in to unmask]>
> Reply-To: Sean Colloby <[log in to unmask]>
> Date: Tue, 27 Feb 2001 15:05:20 +0000
> To: [log in to unmask]
> Subject: Any thoughts?
>
> Dear SPM'ers
>
> I am performing a group vs. single subject comparison in a blind diagnosis
> experiment. An independent researcher then took a random sample of subjects
> from the three groups(Controls, AD and DLB)and renamed each subject, sub1,
> sub2, sub3,..
> ...,subi etc. We then compared the original control group with a single
> subject sub1 then sub2 etc.....When we perform the statistics an error
> message appears
> indicating that the images do not have the same voxel size and orientation,
> which
> to me seems totally bizzare! I have checked each control and sub1, sub2 etc
> in
> MRicro as well as SPM and they all seem identical in terms of dimension,
> voxel
> size and location of origin...............Help!
>
> Does anyone have a theory why this is so?
>
> I look forward to hearing any comments on the matter.
>
> Cheers
> Sean Colloby
> Research Associate
> Imaging Research Group
> Institute for the Health of the Elderly
> Wolfson Research Centre
> Newcastle General Hospital
> Newcastle-upon-Tyne
> NE4 6BE
>
> Tel: +44 (0) 191 2738811 ext 23372
> Fax: +44 (0) 191 2195051
> email: [log in to unmask]
>
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