How are the MNI coordinates for the Desikan-Killiany atlas derived?

[Brains McGee]

Does the x-y-z coordinate of each ROI represent the center of the ROI? I'm trying to come up with an ordered list of the ROIs which follow a rostral to caudal gradient and am ordering it by the y-coordinate.

[Chris Watson]

I actually don't quite remember, as I created the tables several years
ago and was not very diligent about documenting everything,
unfortunately. My best guess was outlined in this thread:
https://groups.google.com/forum/#!topic/braingraph-help/CJbbSbtx5Co

I just checked again, with "fsaverage" labels. If you read in all of
the ".label" files, the average of the coordinates for each region are
reasonably close to the coordinates in the data in brainGraph.
There are larger differences, though.

You can also run "mri_surfcluster" on the label files to get the
centroids (see e.g.
https://mail.nmr.mgh.harvard.edu/pipermail//freesurfer/2016-August/047063.html
).
These values are *extremely* close to the means of the coordinates in
all label files.

I'm fairly certain that I "eyeballed" the coordinates for the
dk{,.scgm} and dkt{,.scgm} atlases. That is, I got the coordinates
from somewhere (I don't remember unfortunately), and then I checked
all of them manually on a MNI152 volume, and manually changed them to
what looked "best". This is of course not at all rigorous, but using
the exact locations has never been a priority for me, except to be
"close enough" for visualization. It depends on how important the
exact value is for your purposes.

The "destrieux{,.scgm}" and all other atlases (except "dosenbach160")
appear to be the "correct" coordinates. For the latter, I think I got
the coordinates from a brainGraph user a few years ago.

Chris

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