Hi Shanqing, this is a known problem. One way around it is to convert 
the label to an annotation (mris_label2annot), then run mri_aparc2aseg 
(converts surface info into a volume), then mri_cor2label to extract the 
final label. It's not elegant, but it works.

doug

Shanqing Cai wrote:
> Hi,
>
> I am using mri_label2vol to generate some volume ROIs from surface labels. I
> noticed that the results contain "holes", by which I mean voxels that aren't
> label and are surrounded by labeled voxels. This seems to happen regardless of
> the step size I specify after the "--proj" option of mri_label2vol and this
> happens in both the gray- and white-matter projections. I am using FS 5.1.0.
>
> I wonder whether other people have experienced similar problems and how these
> holes can be gotten rid of.
>
> Thanks!
>
> Best regards,
> Shanqing Cai
> _______________________________________________
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> Freesurfer@nmr.mgh.harvard.edu
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>
>
>   

-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
gr...@nmr.mgh.harvard.edu
Phone Number: 617-724-2358 
Fax: 617-726-7422

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