I have processed some data with MindBoggle (latest version 1.3.8, no errors reported) with the intention of running a whole-brain longitudinal surface based morphometry analysis.
The basic question I am trying to answer is where in the brain does change in thickness relate to change in a cognitive measure (both cognitive measures and anatomical MRI were acquired before and after an intervention). So, I am trying to compute a longitudinal thickness difference vertex-by-vertex (as opposed to looking at thickness averages within FreeSurfer/ANTs anatomical labels).
A problem is that I cannot figure out how to correspond vertices values from one session to another. The tables in
$MINDBOGGLE_SUBJECT_OUTDIR/ses-post/table/left_cortical_surface/vertices.csv have different number of rows, so it is probably not a one-to-one mapping.
How should I best proceed?