cd $SUBJECTS_DIR/$subject
Sample the aseg onto the surface (looking for the max between -2 and + 2 mm). This will sample all the segmentations, but we are only interested in CC
 mri_vol2surf --regheader $subject--mov aseg.mgz --projdist-max -2 .5 2 --o lh.aseg.mgz --hemi lh
Create a binary map of just the CC
mri_binarize --i lh.aseg.mgz --match 251 252 253 254 255 --o lh.cc.mgz
Compute the area in the binary map
 mri_segstats --i ../surf/lh.area --accumulate --id 1 --seg lh.cc.mgz --sum sum.cc.dat
You'll see something that looks like this in the file:
# ColHeaders  Index SegId NVoxels Volume_mm3 StructName Mean StdDev Min Max Range 
  1   1      1357     1357.0  Seg0001  1028.3962     0.3208     0.0310     2.1589     2.1279
The total area will be under the "Mean" column, 1028.3962 mm2 in this case
As I said, this has not been validated in anyway so use with caution


On 9/29/2019 1:49 PM, Fernanda Hansen P. de Moraes wrote:

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Thank you very much.
I am very interested in this if it is possible.
Is it possible to acquire any other area information of the corpus callosum?

Thank you again,
Fernanda

Em qua, 25 de set de 2019 às 21:10, Greve, Douglas N.,Ph.D. <DGREVE@mgh.harvard.edu> escreveu:
We don't output or have tools to compute it. I can tell you how you can get a number for it, but it would not be with a validated method. Let me know.

On 9/24/2019 5:37 AM, Fernanda Hansen P. de Moraes wrote:

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Dear Freesurfer experts,

how can I extract the corpus callosum cross sectional area for each hemisphere?

Thank you very much in advance,
Fernanda Hansen P. de Moraes

Física Médica | Rede D'Or São Luiz
Doutoranda em Ciências Médicas | Instituto D'Or de Pesquisa e Ensino

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--
Fernanda Hansen P. de Moraes

Física Médica | Rede D'Or São Luiz
Doutoranda em Ciências Médicas | Instituto D'Or de Pesquisa e Ensino

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