Hi Quentin - Yes, this is possible! You can use the info in the pathstats.byvoxel.txt files to do that. The -stat step of TRACULA (see last part of tutorial) will put together all the point-wise, along-the-tract stats of all the subjects into a table. Each element in the table will be one position along the tract for one subject. You can then average, say, the FA values from the first 1/3 of the positions and the last 1/3 of the positions, or something like that, to get the two endings of the tract that you care about.
Hope this helps, a.y ________________________________ From: freesurfer-boun...@nmr.mgh.harvard.edu [freesurfer-boun...@nmr.mgh.harvard.edu] on behalf of Funk, Quentin [qf...@houstonmethodist.org] Sent: Thursday, April 27, 2017 11:24 AM To: freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] TRACULA anterior/posterior Freesurfer experts: I'm interested in comparing anterior and posterior pieces of a tract generated by TRACULA. Ideally, I'd like to take the probabilistic map (i.e. the path.pd.nii.gz from one of the folders in SUBJECT/dpath) and obtain a "posterior part" and an "anterior part" by masking. Then I'd like to extract stats similar to the stats found in pathstats.overall.txt Is this at all possible? I can produce the poster/anterior mask by hand for each individual subject, (although if there were an automated way to do this that I'm unaware of it would be great) but getting the stats out is something I can't quite figure out from the tutorials I've looked through. Thanks for any help! Quentin Funk, PhD Houston Methodist Research Institute 713-363-9003<tel:713-363-9003> Houston Methodist. Leading Medicine. U.S. News & World Report has recognized Houston Methodist as one of the nation’s top 20 hospitals, placing it for the second time on the magazine’s prestigious Honor Roll. It is also designated as a Magnet hospital for excellence in nursing. Visit us at houstonmethodist.org<UrlBlockedError.aspx>. Follow us at twitter.com/MethodistHosp<UrlBlockedError.aspx> and facebook.com/HoustonMethodist<UrlBlockedError.aspx>. ***CONFIDENTIALITY NOTICE*** This e-mail is the property of Houston Methodist and/or its relevant affiliates and may contain restricted and privileged material for the sole use of the intended recipient(s). Any review, use, distribution or disclosure by others is strictly prohibited. If you are not the intended recipient (or authorized to receive for the recipient), please contact the sender and delete all copies of the message. Thank you.
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