Dear FSL experts,
I have performed a vertex analysis for two groups (say A & B) following the recommendations in the FIRST User Guide. When compared to healthy controls, each group has shown significant shape deformations. As a next step, I would like to find a measure of how similar these deformations are in group A & B – i.e. I am searching for a way to quantify to which extend the same areas are affected. I am currently unsure whether the following way to proceed is correct and feasible:
(I) From what I understood, the shape analysis uses a fixed amount of vertices. Is there a way to access positions of each of the n vertices (for example in the form of scalar projection values to the mean surface in the 4D file)?
(II) Since their number is fixed, would it make sense to correlate these n positional values of group A and group B outside of FSL as a measure of similarity?
Any comments or hints would be greatly appreciated! Thank you for your continuous support on this mailing list.
Kind regards,
Josephine
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