Hi Allison,
Thanks.
It is still confusing: for the gm the aseg.stats lists cortical as
well as subcortical and the total volumes (being the sum of both).
But for wm only cortical volumes are present. Is there no
subcortical wm volume present or defined?
Ed
On 27 Oct 2010, at 15:58, Allison Stevens wrote:
Ed,
I would use the values in the aseg.stats. I'm not sure why there is
this
difference (Doug might be able to elaborate on how the values in
aseg.stats are calculated) but for v5.0, we went over how all the
stats
were being calculated and make sure the values in the aseg.stats
were the
most accurate.
Allison
--
On Wed, 27 Oct 2010, Ed Gronenschild wrote:
Dear Bruce/Allison,
Could you please try to give response to my question
which wm and gm volumes I shoud use, see my
today's submission below.
Ed
On 27 Oct 2010, at 14:41, freesurfer-requ...@nmr.mgh.harvard.edu
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
------------
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
--------------
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-requ...@nmr.mgh.harvard.edu
wrote:
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
---
Christian Scheel
Department of Psychiatry
University of Cologne
Am 26.10.2010 15:22, schrieb Ed Gronenschild:
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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