Hi,

I have a strange issue I can't figure out. I am currently trying to use the parcellation from Gordon et al. 2014 (download link here) to create ROIs for the frontoparietal network. They provided a volume of the parcellation in MNI152 space for public use. I took this volume and applied the mri_vol2surf command to it to create 2 overlays of the parcels, 1 for each hemisphere. The code was:

mri_vol2surf --mov Parcels_MNI_111.nii --trgsubject fsaverage --mni152reg --o lh.Parcels_fsaverage_111.mgh --hemi lh

mri_vol2surf --mov Parcels_MNI_111.nii --trgsubject fsaverage --mni152reg --o rh.Parcels_fsaverage_111.mgh --hemi rh

The code ran, but the LH parcels in the volume were transferred to the RH on the surface and vice versa. This is a problem since the parcellation is not symmetric across hemispheres.This is not a problem with the volume either as I looked at it overlayed with the MNI152 brain in fslview and saw that the parcels were on the correct hemisphere. Another problem is that 1 of the frontoparietal parcels, number 24, was not found on the surface of either hemisphere after turning it to a surface. I don't know why this would be the case since there are all cortical parcels.

I have also tried this with a volume ROI that is only located on the left hemisphere. After running essentially the same vol2surf command as above, the ROI only appeared on the RH surface. I am using mri_vol2surf from Freesurfer v6.0.0

Any help would be greatly appreciated. Thank you!

Best,
Matthew Defenderfer

Matthew K. Defenderfer B.S. | Graduate Research Assistant

Graduate Biomedical Sciences | Neuroscience

UAB | The University of Alabama at Birmingham

Laboratory of Kristina Visscher, PhD

Department of Neurobiology

CIRC 111 | C: (865) 805-6389