[Freesurfer] export the ROIs in 'Desikan-Killiany' cortical atlas

Hi FreeSurfer expert,

I am interested in a particular region of the Desikan-Killiany atlas and I'd like to use it as an ROI image mask in my fMRI analysis.

Could you please suggest how I can do that?

From here (http://ftp.nmr.mgh.harvard.edu/fswiki/CorticalParcellation), I see that the DK atlas files are located here:

$FREESURFER_HOME/average/?h.curvature.buckner40.filled.desikan_killiany.gcs

Question 1: how can I read this GCS file?

Question 2: After I read this GCS file, how can I create an ROI image mask?

I am thinking to use the WFU PickAtlas to create an ROI (http://fmri.wfubmc.edu/software/PickAtlas). Would it be a good fit?

Thanks! Daniel

-- Yung-Jui "Daniel" Yang, PhD Postdoctoral Researcher Yale Child Study Center New Haven, CT (203) 737-5454