Thanks Doug. If I need total wm volume I should use the ?h.CorticalWhiteMatterVol?. Does this volume also include the cerebellum wm?

From: freesurfer-bounces@nmr.mgh.harvard.edu [mailto:freesurfer-bounces@nmr.mgh.harvard.edu] On Behalf Of Douglas Greve Sent: Monday, April 02, 2012 8:58 AM To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] total wm volume

The ?h.CorticalWhiteMatterVol is computed based upon a high-resolution surface-based analysis which is capable of subvoxel resolution. The values in the wmparc, by necessity, are computed by just adding up the number of voxels (actually, there is some partial volume correction too), so the values will not add up perfectly. doug

On 4/2/12 9:22 AM, Ayaz, Muhammad wrote: Dear All,

I used the following command line to extract the volumes from Stats file.

asegstats2table --subjects sub1 sub2... --stats wmparc.stats --tablefile aseg_wm_volume.txt

?h.CorticalWhiteMatterVol generated using the above command does not match the volume which I calculated by adding all the 34 cortical wm volumes. I even included the cerebellum volume but the ?h.CorticalWhiteMatterVol still comes out to be higher.

eg. lh.CorticalWhiteMatterVol = 201577 manual calculated lh volume (34 cortical region + cerebellum)=186382

Thanks Ayaz

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