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Hi Wei,
I would strongly recommend against using the Talairach Demon to localize
your functional clusters anatomically. I usually try to use several
sources. Instead of the demon you couse use the Simon's anatomy toolbox
or the aal and brodman maps as implemneted in e.g. mricro, in addition
and more importantly you should double-check with a real atlas like the
Duvernoy atlas of the human brain (on several planes, like axial and
sagittal).
That's how I would do it.
Nicole
Am Jan 05, 2006 10:19 PM schrieb Wei Wang <[log in to unmask]>:
>Hello all,
>
>I have three questions related to find anatomical information.
>
>1) Which function can generate mask.img and mask.hdr? I need two masks
>for both unnormalized images and normalized images.
>
>2) How to obtain the anatomical information (talairach daemon)? Now I
>am
>doing for the following way.
>
>a) Normalized images. MNI coordinate -> Tal coordinate (by mni2tal)
>then
>search talairach daemon database.
>
>b) Nonnormalized iamges. I have a mask.img for nonnormalized images.
>For
>each voxel in the mask I set a non-zero value and set 0 for all other
>voxels. Then do the normalization by spm_write_sn and get a normalized
>mask image. Because normalization will change the voxel size from
>3.125*3.125*6 to 2*2*2, there would be more than one position with
>non-zero value. Averaging the non-zero positions let me have a MNI
>coordinate for this voxel in nonnormalized image. So on so forth to get
>all the MNI coordinates for nonnormalized mask.
>
>Does this method work fine or there is another smart way to do it?
>
>3) Does every coordinate in Tal space have the record in Talairach
>Daemon database? Below are my search results, the first three numbers
>are coordinates in Tal space.
>-1, -71, -38, ** No data at this point. **
>3, -71, -38, ** No data at this point. **
>
>Thanks.
>
>Wei
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Dipl.-Psych. Nicole David
Klinik und Poliklinik für Psychiatrie und Psychotherapie
Universität zu Köln
Kerpenerstr. 62
50924 Köln
Deutschland
Tel:+49-221-478-87146
Fax::+49-221-478-87702
http://www.medizin.uni-koeln.de/kliniken/psychiatrie/Bildgebung/
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