Hi Gabriel, this is normal. The volumes listed with aseg.stats have been
corrected for partial volume, so it is not as simple as counting up all
the voxels.
doug

On 11/21/2012 12:36 PM, Gabriel Gonzalez Escamilla wrote:
> Dear Freesurfer,
>
> I'm trying to convert come labels from the aseg.mgz into nifti volumes
>
> I'm using:
> mri_extract_label aseg.mgz # and aseglabel#.nii
> where the # is the label as appears on the freesurferColoLUT.txt
> and it seems to work perfectly, but the number of voxels does not
> match with the number of voxels output in the aseg.stats, is this normal?
> they vary from i.e. 2603 in the aseg.stats to 2466 in the volume.
>
>
> to verify that it was't a problem from the extraction, I have tryed
> mris_binarize to match the same # segID as the mri_extract_label,
> and also use the matlab functions to open the aseg.mgz and keep those
> voxels which value were close to the #.
>
> With these two new options I get exactly the same number of voxels as
> with mri_extrac_label. So I don't know what could be the problem. Does
> anyone have an idea?
>
>
> Best Regards,
> Gabriel.
>
>
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--
Douglas N. Greve, Ph.D.
MGH-NMR Center
greve@nmr.mgh.harvard.edu
Phone Number: 617-724-2358
Fax: 617-726-7422

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