Hi Doug and Freesurfers,
I ran mri_surfcluster to generate coordinates for cluster maxima from a
functional surface analysis. The summary text file generated by
mri_surfcluster lists a bunch of information about the clusters, including
talairach coordinates for each cluster peak (see example below). I
visualized these max vertices in tksurfer by entering the "VtxMax" given
in the summary file into the "Vertex Index" field in the tksurfer tools
window. I'm noticing, however, that the talairach coordinates given in the
tksurfer tools window ("Vertex Talairach") after entering the vertex index
are not the same as the coordinates listed in the summary file. Seems the
coordinates are off by .5 - 1 millimeter or so, which I know is not much,
but I'm curious if anyone knows the reason for this discrepancy?
Additionally, if we want to use the peaks for seeds in a functional
connectivity analysis which set of coordinates is more accurate?
Any insight would be greatly appreciated!
Best,
Alex
Ex. Summary text file:
# ClusterNo Max VtxMax Size(mm^2) TalX TalY TalZ NVtxs
1 33.019 124877 1219.98 30.7 21.1 -1.4 2841
2 27.538 116676 1406.49 7.6 23.7 38.1 2923
3 25.380 109387 3977.58 41.9 31.2 26.7 7023
4 24.404 86863 3241.21 31.5 -60.2 39.0 7288
5 -20.441 104109 1903.13 5.5 20.5 -7.4 3923
6 18.118 141781 600.75 5.5 -23.0 26.4 1553
Cluster 1 Vertex Talairach coordinates from tksurfer tools: (29.88 20.79
-1.32)
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