Hi Jon,
it's probably because the annotations are vertex based, and the metric properties come from the triangles, so some triangles (the border ones) are counted more than once. Sigh. We'll fix it and get back to you.
Bruce
On Fri, 4 Nov 2005, Jonathan Kaiser wrote:
I have an annotation file that covers the entire surface (each vertex has an annotation). When I run mris_anatomical_stats with the annotation file and sum the values from each annotation, I get a larger result for the surface area and a smaller value for the gray matter volume than if I run mris_anatomical_stats with just the surface (no annotation file specified on the command line).
[cuneus:kentron] (nmr-dev-env) mris_anatomical_stats -a 2859_4_ct/label/rh.cmaparc.annot -b 2859_4_ct/ rh
sum of each annotations' surface area: 112383 mm^2 sum of each annotations' gray matter volume: 375675 mm^3
[cuneus:kentron] (nmr-dev-env) mris_anatomical_stats 2859_4_ct/ rh
total surface area = 98400 mm^2 total gray matter volume = 401366 mm^3
-Jon _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer