[Freesurfer] Volumes for labels

Hi,

I was just wandering exactly how the grey matter volume for a given label is calculated in mris_anatomical_stats. Multiplying the average thickness by the area estimate I get in the output file does not give me exactly the same estimate of grey matter volume as what mris_anatomical_stats returns.

Is the mris_anatomical_stats volume estimate calculated on a vertex-by-vertex basis?

Thanks,

Alex

Alex Fornito JN Peters Research Fellow Melbourne Neuropsychiatry Centre National Neuroscience Facility The University of Melbourne Levels 2 & 3, 161 Barry St Carlton South 3053 Vic Australia Ph: +61 3 8344 1861 Fax: +61 3 9348 0469 Email: fornitoa@unimelb.edu.au