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Dear Freesurfer experts:

I am on ROI analysis tutorial:  
https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/AnatomicalROIV6.0

And I am trying to understand the relationship between:

    /label/?h.aparc.annot and /mri/aparc+aseg.mgz
    /label/?h.aparc.a2009s.annot and /mri/aparc.a2009s+aseg.mgz

I understand /label/?h.aparc.annot corresponds to "Desikan-Killiany  
atlas" and its labels have 35 different labels (except unknown 0),  
while in several cases you mentioned that "/mri/aparc+aseg.mgz"  
corresponds to "Desikan-Killiany atlas", which I DO NOT understand.
    "/mri/aparc+aseg.mgz" to me are subcortical segmentations while  
"/label/?h.aparc.annot" are cortical(surface) parcellations.  
"Desikan-Killiany atlas" should mean "cortical (surface)  
parcellations".  That's why I do not understand why  
"/mri/aparc+aseg.mgz" corresponds to "Desikan-Killiany atlas"?

  Could anyone help me understand this?

Yerong


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