Yea, that's what I would do. You can run asegstats2table to get a list of the volume for all ROIs (so this gives you a matrix of 550 by about 50). For each row (subject), compare the volumes to that of every other row. You'll need to come up with a comparison function; maybe mean percent difference (you might need to exclude very small structures like optic chiasm, vessels, etc -- or only include certain structures like hippo, put, pal, lat vent, cerebellum, etc). Then rank all the subjects from lowest to highest difference and look at the ones with the lowest difference. You can probably think of other ways
On 09/11/2017 03:17 PM, Sherrill, John T wrote: > I have run recon-all on all of the files. So I should start with > asegstats2table ( https://surfer.nmr.mgh.harvard.edu/fswiki/asegstats2table ) > ? > > John Sherrill > jtsherr...@uams.edu > john_sherr...@me.com > (870) 761-0580 > > ________________________________________ > From: freesurfer-boun...@nmr.mgh.harvard.edu > <freesurfer-boun...@nmr.mgh.harvard.edu> on behalf of Douglas N Greve > <gr...@nmr.mgh.harvard.edu> > Sent: Monday, September 11, 2017 2:07 PM > To: freesurfer@nmr.mgh.harvard.edu > Subject: Re: [Freesurfer] Finding Duplicate Subjects in a Database > > One way is to perform a 6DOF registration between each pair. It is a lot > of pairs, but I don't think you can avoid it. Pairs that come from the > same subject will have an abnormally high (or low) objective function. > You could use mri_coreg (use --no-smooth) . If you've already run all > 550 through FS, then you might be able to look a the aseg.stats for > similar subjects. > > > On 09/11/2017 02:50 PM, Sherrill, John T wrote: >> I am trying to find the best way to identify likely duplicate subjects >> with in a database of about 550 subjects. Some subjects where >> duel-consented for studies and had multiple scans over a relatively >> short period of time. What is the best way to tease these out? >> >> John Sherrill >> jtsherr...@uams.edu >> john_sherr...@me.com >> (870) 761-0580 >> ------------------------------------------------------------------------ >> Confidentiality Notice: This e-mail message, including any >> attachments, is for the sole use of the intended recipient(s) and may >> contain confidential and privileged information. Any unauthorized >> review, use, disclosure or distribution is prohibited. If you are not >> the intended recipient, please contact the sender by reply e-mail and >> destroy all copies of the original message. >> >> >> _______________________________________________ >> Freesurfer mailing list >> Freesurfer@nmr.mgh.harvard.edu >> https://urldefense.proofpoint.com/v2/url?u=https-3A__mail.nmr.mgh.harvard.edu_mailman_listinfo_freesurfer&d=DwIBAg&c=27AKQ-AFTMvLXtgZ7shZqsfSXu-Fwzpqk4BoASshREk&r=GlCsJ1nbrLG5ArDAnb2y529XqTlrni04Bu0-BvZuTm4&m=jGHTu2DMCG15a-BloX3mgf3XGM-EDWmdST6ob9hi1s4&s=3njeh9IV2-mOyQ5jJRFboeitp92qUpuOvYjURKAMuB8&e= > -- > Douglas N. 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If you are not the intended recipient, please > contact the sender by reply e-mail and destroy all copies of the original > message. > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > -- Douglas N. Greve, Ph.D. MGH-NMR Center gr...@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ _______________________________________________ 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.
