Dear Pierre,
>I'm currently trying to run these analyses on images which are coregistered and normalised but have
> different dimensions (i.e. 79 95 68 for some 91 109 91 for others), and SPM8 can't apparently run t-tests
> on images which do not have identical dimensions.
Why do you actually have different dimensions? Was the rest of the preprocessing the same except of the dimension, set during the normalization? In case there are other differences as well, I would recommend to run it with a common batch again.
>Is there a simple way to uniformize the image dimensions (without having to reanalyze the whole set of data)?
> In other words, is is possible to delete some parts of a contrast image (which do not contain activations)
> without modifying the dimensions of the brain activations?
the easiest way - without re-running everything again - is to use 'Coregister reslice only'. Select one image with the dimension you would like to have as your reference (or space defining image) and then all contrast images as images to reslice. Note that this will reslice the images, including interpolations.
Good luck,
Karsten
--
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Karsten Specht, PhD
Department of Biological and Medical Psychology
Bergen fMRI group
University of Bergen
Jonas Lies vei 91
5009 Bergen
Norway
Tel.: +47-555-86279
Fax: +47-555-89872
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http://fmri.uib.no/
-----Ursprüngliche Nachricht-----
Von: "Pierre Maurage" <[log in to unmask]>
Gesendet: 28.sep.2011 15:41:29
An: [log in to unmask]
Betreff: [SPM] Image dimension for second level analyses
>Good afternoon,
>
>I have a question concerning the image dimensions in second level analyses (group analyses).
>
>I'm currently trying to run these analyses on images which are coregistered and normalised but have different dimensions (i.e. 79 95 68 for some 91 109 91 for others), and SPM8 can't apparently run t-tests on images which do not have identical dimensions.
>
>Is there a simple way to uniformize the image dimensions (without having to reanalyze the whole set of data)? In other words, is is possible to delete some parts of a contrast image (which do not contain activations) without modifying the dimensions of the brain activations?
>
>Thanks in advance,
>
>Pierre Maurage
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