Thank you Douglas ! Le 10 nov. 2016 7:21 PM, "Douglas N Greve" <gr...@nmr.mgh.harvard.edu> a écrit :
> You need to weight by the number of vertices > > n = [27805 2321 552]; > m = [8.8194 10.3661 10.3365]; > sum(n.*m)/sum(n) > > ans = > > 8.9637 > > > On 11/10/2016 06:44 AM, Matthieu Vanhoutte wrote: > > Dear Freesurfer's experts, > > > > Could anyone please explain me the difference I got with command line > > in below mail ? > > > > Best regards, > > Matthieu > > > > 2016-08-12 12:07 GMT+02:00 Matthieu Vanhoutte > > <matthieuvanhou...@gmail.com <mailto:matthieuvanhou...@gmail.com>>: > > > > Dear experts, > > > > I am in trouble with two ways of computing mean intensity with > > mri_segstats. > > > > First I have used on .annot files with three different labels > > inside (SegId 1 to 3) : > > > > /mri_segstats --annot fsaverage lh cache.th23.pos.sig.ocn.annot > > --i lh.PET.fsaverage.sm10.mgh --sum lh.pet.sum/ > > / > > / > > which give me those results: > > # ColHeaders Index SegId NVertices Area_mm2 StructName Mean > > StdDev Min Max Range > > 1 1 27805 14182.6 cluster-001 8.8194 1.4351 > > 6.2105 14.2947 8.0842 > > 2 2 2321 1047.3 cluster-002 10.3661 1.0848 > > 8.8375 12.9317 4.0942 > > 3 3 552 313.1 cluster3 10.3365 0.4711 > > 9.3719 11.8694 2.4975 > > > > Second I have created on .label files containing the three > > segmented labels (SegId 1 to 3) and used this label with > mri_segstats: > > > > /mri_segstats --slabel fsaverage lh > > lh.th23.cluster.thresh1.3.label --i lh.PET.fsaverage.sm10.mgh > > --excludeid 0 --sum lh.pet.label.sum / > > / > > / > > which give me those results:/ > > / > > /# ColHeaders Index SegId NVertices Area_mm2 StructName Mean > > StdDev Min Max Range / > > / 1 1 30678 15542.9 Seg0001 8.9637 1.4701 6.2105 > > 14.2947 8.0842 / > > / > > / > > I verified if I obtained the same results with the two ways > > (.annot or .label) and everything is fine comparing NVertices, > > Area_mm2 but Mean in first way gives me (8.8194+10.3661+10.3365)/3 > > = 9.84066 and with .label file Mean = 8.9637. > > > > Did I have miss anything and how is computed mean intensity ? > > > > Many thanks in advance. > > > > Best regards, > > Matthieu > > > > > > > > > > _______________________________________________ > > 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. > >
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