Hi Angela, Marie is the best one to answer the questions about gyrification, but I've tried below doug
On 11/28/2012 11:30 AM, angela.fav...@unipd.it wrote: > Hi all, > > I would need some information about the local gyrification index. > I run the analyses and found which are the average indices for subject and > hemisphere. > > 1. Is there a method to perform vertex-wise group statistics? that is may > I compare maps of gyrification across groups? You should be able to use mris_preproc and mri_glmfit similar to doing a thickness analysis. > > 2. Is there a method to obtain average gyrification for a single label of > the atlas? For example gyrification of superior frontal gyrus. I > understand that sulci are often used to find the delimitation of a gyrus > or a brain area, and probably this is a problem. You should be able to run mris_anatomical_stats or mri_segstats to give you summaries over the annotation ROIs. > > 3. Are there any other method to measure the presence or the depth of a > sulcus. We are analysing a group of subjects with a genetic illness. They > often lack a sulcus in the orbitofrontal area. Is there a method to > quantify this using freesurfer? You can try doing a group analysis using ?h.curv or ?h.sulc (instead of ?h.thickness). doug > > thank you for your help > > best wishes > > Angela > > > _______________________________________________ > 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: 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.
