Hi Laura, there were issues with 5.2 surface accuracy on some types of acquisitions. You should rerun with 5.3 and see how the #s look.
cheers Bruce On Thu, 11 Jul 2013, L. Koenders wrote: > Dear FreeSurfer experts, > > We have a question regarding the aparc output from the stats files, and > hopefulle you can help us. > We have 4 independent groups, of about 30 subjects per group, all scanned > using the same protocal on the same MRI scanner. We ran the cross sectional > FreeSurfer (5.2.0, Linux centos4_x86_64) pipeline, and extracted the volume > information per person from the .stat files using Matlab. We transfered the > volume information into SPSS, to calculate the Means and Standard Deviations > per group. > > We are interested in a couple of regions of interest (anterior + posterior > cingulate, OFC, parahippocamus and insula). > > What strange is though, it that the means and standard deviations of 3 groups > are comparable across all regions, but the SDs of 1 group are very (very!) > large. This is not a group in which we expect brain atrophy or anything like > that. Below you see the SD values of all groups, with SD values up to four > times bigger in group 1! > > 1 2 3 4 > caudal ACC 618 516 643 589 > rostral ACC 1583 578 692 623 > PCC 1942 721 616 749 > OFC 2632 1345 1844 1652 > parahip 1198 346 271 394 > insula 1410 1033 1096 1017 > > The outliers are different subject in every region, and I checked the > parcellation output of them, that looks fine. We are wondering what could be > the cause of this, do you have any ideas? > > Thank you in advance, > > Kind regards, > Laura > ________________________________ > > AMC Disclaimer : http://www.amc.nl/disclaimer > > ________________________________ > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > _______________________________________________ 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.
