Dear Soohyun,
The best way to determine the anatomical locations would probably be
to overlay your cluster masks onto the relevant structural images and
determine the anatomy by hand. For instance, if it is a group
result, then you could display it on the group mean structural scan
(which by default is bg_image). Then simply use FSLview to create a
"mask" of each of the regions of interest anatomically. You can save
those images as binary nifti files and use avwmaths to get the
relevant activated voxels from your cluster mask:
avwmaths cluster1 -mas DLPFC dlpfc_roi
this will take the voxels from cluster1 that are present in the dlpfc
and put them into a file call dlpfc_roi.
>Should I use the Talairach Daemon to look up Brodmann areas
>corresponding to the MNI coordinates that we have?
No, definitely not. THe coordinates are not in the same space and
T&T coordinates are neither representative of the population nor are
the BA accurate. The best way to proceed is to do it by hand,
presumably with reference to an atlas such as Duvernoy. I know it's
time consuming and difficult, but it is the most accurate method.
Hope this helps.
- Joe
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Joseph T. Devlin, Ph. D.
FMRIB Centre, Dept. of Clinical Neurology
University of Oxford
Headley Way
Oxford OX9 3DU
Phone: +44-(0)1865-222-494
Email: [log in to unmask]
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