Hi, 

I saw the same question has been asked and no answer was provided:

I run 

  ----     "mri_cor2label --c fsaverage/mri/aseg.mgz --id 4 --l fsaverage/label/Left-Lateral-Ventricle.label --surf fsaverage lh"    -----

to hopefully extract lateral ventricles volume into a overlay of surface base. however, gave me error: "dim mismatch between surface (100515) and input (16777216)".  What should I change?

BTW, Also have questions for the following steps and hope you can answer that too:

1. convert surface-based label to volume, 

"mri_label2vol --label fsaverage/label/Left-Lateral-Ventricle.label --subject fsaverage --hemi lh --identify --temp fsaverage/mri/T1.mgz --o fsaverage/mri/lh.Left-Lateral-Ventricle.nii --proj frac 0 1 0.01

2. Better ROI with mri_binarize

"mri_binarize" --dilate 1 -erode 1 --i fsaverage/mri/h.Left-Lateral-Ventricle.nii --o fsaverage/mri/h.Left-Lateral-Ventricle.nii --min 1

3. constrain the thick ROI

"mris_calc -o fsaverage/mri/h.Left-Lateral-Ventricle.nii fsaverage/mri/h.Left-Lateral-Ventricle.nii  mul fsaverage/mri/h.Left-Lateral-Ventricle.ribbon.mgz

4. Questions: Are the aforementioned steps correct?  In the end, if I have a couple of ROIs, what should I use to combine them. or just load them separately with lh.white and lh.pial. 

Best, 

Qi