Hi Maryam - You could compare the different measures like FA or MD across subjects along the length of the pathway.

There will be a different number of points along the pathway for each subject, so you'd have to interpolate the data points from all your subjects to do a point by point comparison. This can be done in matlab for example, and hopefully there'll be a built-in command for this in the next release!

Hope this helps, a.y

On Tue, 28 Jun 2011, Maryam Moteabbed wrote:

Hello Tracula Developers & Users,

I can follow how to use the diffusion measures from pathstats.overall.txt for each subject to run a group analysis on the tracts.

On the other hand I noticed there is also the pathstats.byvoxel.txt which contains various diffusion measures in each voxel along the highest probability path. What are your suggested steps for analyzing this text file for group comparison? I am guessing developers had an analysis method in mind when they decided to print this file out.

Thank you in advance for your help.

Best, Mary _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer