Re: [Freesurfer] Total GM and WM volumes

Hi Ed, I can't replicate this. Can you double check your numbers again? In particular, can you compare them against numbers that are printed in the recon-all.log file?

In recon-all.log, look for the lines Getting Cerebral GM and WM volumes from surfaces lh surface-based volumes (mm3): wTot = 244767.110356, pTot = 436943.557923 c = 192176.447567 rh surface-based volumes (mm3): wTot = 243959.351030, pTot = 438113.303648 c = 194153.952618

These might be repeated through out the file if you're re-run. Make sure they are the last set.

The wTot and pTot should give you the same values as mris_volume ?h.white and mris_volume ?h.pial It does when I run it here.

doug

Ed Gronenschild wrote:

Dear Christian,

Thanks for your suggestion. I followed the instructions to derive the GM and WM volumes. Here are the (rounded-off) results for one example:

mris_volume lh.pial: 532767 mris_volume rh.pial: 536127

mris_wm_volume lh: 251139 mris_wm_volume rh: 254730

Accordingly: gm lh = 532767 - 251139 = 281628 gm rh = 536127 - 254730 = 281397

Left + right: total = 1068894 wm = 505869 gm = 563025

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The aseg.stats file lists the following results:

cortical wm lh: 251139 cortical wm rh: 254730 total wm: 505869

cortical gm lh: 263888 cortical gm rh: 265231 total cortical gm: 529119 subcortical gm: 181270 total gm: 710389

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For wm both results are equal but for gm they are not.

So now my question still exists: which wm and gm volumes should I take?

Ed

On 26 Oct 2010, at 20:40, freesurfer-request@nmr.mgh.harvard.edu mailto:freesurfer-request@nmr.mgh.harvard.edu wrote:

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Dear Ed,

to my knowledge, "mris_wm_volume" is the best option to determine the white matter volume.

See this wiki page for usage: http://surfer.nmr.mgh.harvard.edu/fswiki/MorphometryStats

Best wishes, Christian

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Christian Scheel Department of Psychiatry University of Cologne

Am 26.10.2010 15:22, schrieb Ed Gronenschild:

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Hi,

I post this once again because I didn't get any response.

In the v5.0.0 aseg.stats file I can find the following volumes:

• left/right cortical gray matter
  

• subcortical gray matter
  

• total cortical gray matter
  

• total gray matter volume
  

and

• left/right cortical white matter
  

• total cortical white matter
  
  

How can I derive the total white matter volume?

Ed

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