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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