Hi,
I've found that the number of voxels for a given aseg ROI in aseg.stats does not match exactly the number of voxels when I load the aseg.mgz in matlab and find the voxels of the corresponding ROI code. e.g. vol=load_mgh('aseg.mgz'); length(find(vol==17)).
Is there a reason for this difference?
Don
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Hi Don,
we do partial volume correction when we compute the volume of each structure.
cheers, Bruce
On Sat, 3 Feb 2007, Don Hagler wrote:
Hi,
I've found that the number of voxels for a given aseg ROI in aseg.stats does not match exactly the number of voxels when I load the aseg.mgz in matlab and find the voxels of the corresponding ROI code. e.g. vol=load_mgh('aseg.mgz'); length(find(vol==17)).
Is there a reason for this difference?
Don
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Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
Hi there: when according to the Talaraich atlas motor and sensory ares are defined (i.e. pre and post central gyrus) are the medial parts of them included or are those referring only to the lateral ones? In other words, paracentral lobule is separated from them? If so, how can I define the frontal from the parietal part of the paracentral lobule? Thanks, Francesca
Hi Francesca,
I'm not sure I understand what you're trying to do. You can always use the tksurfer drawing tools to create whatever ROIs you want on an average surface, then use mri_label2label to map it to a set of individuals of neither of our default cortical parcellations gives you what you want.
cheers, Bruce
On Sun, 4 Feb 2007, Bagnato, Francesca (NIH/NINDS) [E] wrote:
Hi there: when according to the Talaraich atlas motor and sensory ares are defined (i.e. pre and post central gyrus) are the medial parts of them included or are those referring only to the lateral ones? In other words, paracentral lobule is separated from them? If so, how can I define the frontal from the parietal part of the paracentral lobule? Thanks, Francesca
freesurfer@nmr.mgh.harvard.edu
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Bagnato, Francesca (NIH/NINDS) [E] -
Bruce Fischl -
Don Hagler