Hi-try one of the intensity normalisation options in fslmaths.
Cheers
--------------------
Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington,
Oxford. OX3 9 DU, UK
+44 (0) 1865 222726 (fax 222717)
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http://www.fmrib.ox.ac.uk/~steve
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On 5 Oct 2010, at 18:49, Naranjargal Dashdorj <[log in to unmask]> wrote:
> Dear all,
>
> I wanted to use a 4D image to obtain a 4D average image that has the
> average intensity at each time point.
> So I thought I could use [fslmaths 4Dimage -Xmean -Ymean -Zmean
> average].
> This command returns the average value but x,y,z are all zero, and I
> cannot really use if with fslmaths later. Ideally, I would like to
> obtain a 4D image with all voxels have the same average intensity value
> in a same volume, but different at each time point, then I could use
> this to normalize the data by diving another 4D image by this averaged
> 4D image.
>
> Could you please give me some advice.
>
> Many thanks in advance,
>
> Nara
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