Hello experts,
I identified two clusters (X for thickness and Y for volume) showing significant association between cortical measures (thickness and volume) and motor-performance. I followed steps from here: https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/GroupAnalysis and got several output files same as mentioned at the bottom of this page i.e. cache*.*
I am interested in getting subject-wise thickness and volume values from these two clusters X and Y.
From previous posts, I found that these subjectwise cluster values (e.g.
thickness and volume) are saved in *.ocn.dat file. If that's correct, I have following questions:
(1). When I look at *.ocn.dat file, subjectwise thickness values range between 2-3 and volume values are in the range between 0-2. I am not sure if that makes sense and what are the units of thickness and volume here?
(2). Since *.ocn.dat file for X gives subjectwise thickness value for cluster X and *.ocn.dat file for Y gives subjectwise volume values for cluster Y, so how can I get volume values for cluster X and thickness values for cluster Y?
From pervious FS discussion, I found that it can be done using *.ocn.annot
files e.g. to extract volume values from X, *.ocn.annot for X can be used in mris_anatomical_stats file. To make sure and confirm that this is the correct approach, I calculated thickness values for X using this approach, expecting that these should match with *.ocn.dat for X but it's not matching. I also converted *.annot to *.label in native space following steps from https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg53591.html but still values are not matching with *.ocn.dat.
I would really appreciate any help.
Thanks, Sahil