You can use fslspilt to separate your skeleton. See http://www.fmrib.ox.ac.uk/fsl/tbss/index.html#nonFA for description about calculating mean diffusivity.
Hope this is helpful.
Christine
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From: FSL - FMRIB's Software Library [[log in to unmask]] on behalf of SUBSCRIBE FSL Megana [[log in to unmask]]
Sent: Thursday, January 05, 2012 11:18 AM
To: [log in to unmask]
Subject: Re: [FSL] #99 out of memory on tbss_non_FA
Hi,
Could you please let me know how to split up the data in to chunks and run tbss_non_FA
-Thank you
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