Dear FreeSurfer experts,
I computed distances on the cortex surface of fsaverage using mris_pmake. The
exact syntax of the distance computation was:
mris_pmake --subject fsaverage --hemi lh/rh --surface0 smoothwm --curv0 sulc
--curv1 sulc --mpmOverlay euclidean --mpmProg pathFind --mpmArgs
startVertex:XXXXX,endVertex:XXXXX .
Subsequently, the euclidean distance was computed using the MNI coordinates
displayed by tksurfer if the startVertex and the stopVertex are selected:
distance_euc =
sqrt[(startMNI_x-stopMNI_x)^2+(startMNI_y-stopMNI_y)^2+(startMNI_z-stopMNI_z)^2]
.
The in-surface distance must be larger or equal to the euclidean distance.
However, in ~50% of the cases investigated the opposite is computed. Typical
distances calculated are in the range of 7 mm. Do you have an explanation for
this outcome and a possible solution? How can it be corrected? I am using
FreeSurfer 5.3 and did not encounter any other problems in data evaluation. Any
help us highly appreciated!
Sincerely yours
pfannmoe
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