This raises an interesting question. Given that the longitudinal process is more reliable, if we collect 2 scans on the same day, should we average those scans and then submit to Freesurfer or apply Freesurfer first and then create an average of the metrics from the longitudinal pipeline?
Best Regards, Donald McLaren ================= D.G. McLaren, Ph.D. Research Fellow, Department of Neurology, Massachusetts General Hospital and Harvard Medical School Postdoctoral Research Fellow, GRECC, Bedford VA Website: http://www.martinos.org/~mclaren Office: (773) 406-2464 ===================== This e-mail contains CONFIDENTIAL INFORMATION which may contain PROTECTED HEALTHCARE INFORMATION and may also be LEGALLY PRIVILEGED and which is intended only for the use of the individual or entity named above. If the reader of the e-mail is not the intended recipient or the employee or agent responsible for delivering it to the intended recipient, you are hereby notified that you are in possession of confidential and privileged information. Any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited and may be unlawful. If you have received this e-mail unintentionally, please immediately notify the sender via telephone at (773) 406-2464 or email. On Tue, Jun 25, 2013 at 2:00 PM, Martin Reuter <mreu...@nmr.mgh.harvard.edu>wrote: > 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 > *W *http://www.dutcharc.nl > > > > _______________________________________________ > Freesurfer mailing > listfreesur...@nmr.mgh.harvard.eduhttps://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > -- > 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 > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > The information in this e-mail is intended only for the person to whom it > is > addressed. If you believe this e-mail was sent to you in error and the > e-mail > contains patient information, please contact the Partners Compliance > HelpLine at > http://www.partners.org/complianceline . If the e-mail was sent to you in > error > but does not contain patient information, please contact the sender and > properly > dispose of the e-mail. > >
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