The 4th column is the gray matter volume ("GrayVol").
doug
Ed Gronenschild wrote:
Doug,
I don't understand this since the ?h.aparc.stats file doesn't contain volumes.
Ed
On 18 Jun, 2010, at 15:56, Douglas N Greve wrote:
Yes, the difference is partial volume correction. But you should use the values from the ?h.aparc.stats file for cortical parcellations as it uses the more accurate surface-based volumetric calculation.
doug
Ed Gronenschild wrote:
But what about the labels starting with "lh-ctx-" and "rh_ctx-", like for instance lh-ctx-fusiform (index=1007). In the wmparc.stats file it has a volume of 8249 voxels and in wmparc.mgz 8752 voxels? Is the first pve-corrected and the latter not?
On 18 Jun, 2010, at 13:43, Allison Stevens wrote:
You're right - aseg.stats refers to the aseg.mgz and you should use that. You would only use the wm parcellations from the wmparc.mgz
--
On Fri, 18 Jun 2010, Ed Gronenschild wrote:
Hi,
I tried to find out this from previous contributions but got lost. There's some confusion on which file(s) to use for segmented volumes. FreeSurfer generates the following image and text files:
- aseg.mgz
- aseg.stats
- aparc+aseg.mgz
- wmparc.mgz
- wmparc.stats
To my best knowledge aseg.stats contains the volumes from the structures in aseg.mgz, but corrected for partial volume effects.
The volumes listed in the aseg.stats and wmparc.stats are in most cases different. Which volumes are the correct ones and to which of the image files are these referring?
Ed
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