You can use
mri_binarize --i aparc+aseg.mgz --match 1028 --o 
ctx-lh-superiorfrontal.nii.gz
See  $FREESURFER_HOME/FreeSurferColorLUT.txt for the list of codes to use


On 12/04/2018 12:51 PM, Song, Da-Yea wrote:
>
>         External Email - Use Caution
>
> Hello,
>
> Is there a command to extract ROIs from atlases (ex. desikan) in nifti 
> file formats?
>
> Thank you so much in advance for your time.
>
> Best,
>
> Da-Yea
>
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