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Hello,

 

You are right till the part that you will get images in stereotactic atlas. But If you are talking about the PET/SPECT images then you need to count normalize those, because the image with high intensity will contribute more to the avg. image if the averaging is done prior to count normalization.

 If you are talking about MRI images(which you are, as you have said Gray matter images), then you don't need to do count normalization, as you know the intensity of MRI images is not an issue when you average, them. So you can directly average the images in stereotactic atlas to get the template.

 

Count normalization-

"spm_adjmean_ui" type this in matlab_commanwindow and follow the GUI, then,,,

 

Abhinay

Principal Imaging Scientist

AVID Radiopharmaceuticals Inc.

3624 Market Street

5th floor

Philadelphia, PA 19104

cellular:-817-995-3962

 

On 4/5/07, Dr H.C. Slawik <[log in to unmask]> wrote:

Dear all, I have a very basic question which is how to create a template
using SPM5? I apologize if this is a redundant question, I have found a
question about it in the archives of this mailing list but no answer to it
and I could not find any literature reference in pubmed on SPM5 templates
yet. 1. I guess I will have to use the segment procedure and create grey
matter output files of my control subjects which are normalized to
stereotactic space and then create an average image of it? 2. As
recommended in Marco Wilke's et al. paper 2002 (using SPM99) for a children
template I would like to use a brainmask which did not work when I put it
in under custom->masking. Thank you in advance for any advice on this.
Helen