Hi,
We would like to test the thickness repeatibility in a particular region of interest from 6 scans of the same subject in the same session and from the same subject in 6 different sessions to compute the overall statistics of them.
We are trying to follow the protocol described in the wiki page about Thickness Repeatibility (http://surfer.nmr.mgh.harvard.edu/fswiki/ThicknessRepeatibility) but we're encountering some problems.
We defined with tksurfer tools the label corresponding to the roi intended, afterwards we converted it in an annotation. The tutorial suggests the use of mris_thickness_diff but we have 6 scans, rather than only 2. So what can we do?
Anyway we tried to find the thickness difference map using the first scan as the reference surface and the others as the input surfaces but, since we'd like to analyze the thickness deviation standard in a specific region, we used the option flag -annotation and the results seem wrong: we tried to use several annot files, specifing different label names but we found always the same error: total 0 vertices involved in thickness comparison.
Any suggestions for our data?
Thanks,
Elisa Molinari, Martina Campanella