Hi Cedric,
this is as expected, the data changes when using the longitudinal stream
(it will become more reliable, removing some of the variance you get in
the independent processing). Becuase of the different processing
approaches, the results from independent processing (cross) and long
will not be directly comparable.
Cheers, Martin
On 06/25/2013 04:02 AM, Koolschijn, Cédric wrote:
Hi FreeSurfers,
I ran the longitudinal processing pipeline on my subjects, FS 5.0.
Following the tutorial, first independently, then base, then long
etc. Everything works well, no problems there.
Out of curiosity I compared the asegstats & aparcstats within subject
at baseline (i.e. The same timepoint): so the independent fsid vs the
same_fsid.long.same_fsid_template, and there are (large) differences
between all volumes/thicknesses. The independent measures are in
almost all brain areas larger compared to those derived from the
longi-stream. Except for the IC, which is completely the same, but of
course, this measure is based on the Buckner method and calculated
differently.
Overall this seems a bit strange to me, because I believe there
shouldn't be differences within subject on the same time-point.
Is this the result of the within-subject template use for the
longitudinal data or is something else going wrong, or is this normal?
Many thanks!
Cheers,
Cédric
------------------------------------------------------------
P.C.M.P. Koolschijn (Cédric), PhD
Dutch Autism & ADHD Research Center
Brain and Cognition
Amsterdam, The Netherlands
/E /p.c.m.p.koolsch...@uva.nl <mailto:p.c.m.p.koolsch...@uva.nl>
/W /http://www.dutcharc.nl
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--
Martin Reuter, Ph.D.
Assistant in Neuroscience - Massachusetts General Hospital
Instructor in Neurology - Harvard Medical School
MGH / HMS / MIT
A.A.Martinos Center for Biomedical Imaging
149 Thirteenth Street, Suite 2301
Charlestown, MA 02129
Phone: +1-617-724-5652
Email:
mreu...@nmr.mgh.harvard.edu
reu...@mit.edu
Web : http://reuter.mit.edu
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