Hi Corinna,
the gwratio.mgh is a scalar field over the surface, *not* a surface (i.e. it has no topology information). Try:
mris_anatomical_stats -t lh.gwratio.mgh
and the rest as normal. Note that it will report the values as "thickness"
cheers Bruce
On Mon, 30 Aug 2010, corinna bauer wrote:
I am trying to get an output with average gray/white ratio values for each segmentation. I tried using the gwratio.mgh file as the input for mris_anatomical_stats, but got the following error message:
reading input surface /home/freesurfer4.4.0/subjects/1057/surf/lh.gwratio.mgh... ERROR: MRISread: file '/home/freesurfer4.4.0/subjects/1057/surf/lh.gwratio.mgh' has 0 vertices!
Any insight?