Hi Doug
I'm doing just that - creating a statistical probability map to look at the overlap across the 40 subjects for a given sulcus. When we do this volumetrically it is traditional to smooth using FWHM of 3mm (about the width of a sulcus). *I was told for surface data it needs to be more than this, but I do not want to over-smooth.* The command you gave me to do this back at the workshop in September was mris_fwhm. I just wanted to know what an acceptable FWHM value would be.
Trisanna
-- Ph.D. Candidate McGill University Integrated Program in Neuroscience Psychology
On Wed, May 24, 2017 at 5:08 PM, Douglas N Greve greve@nmr.mgh.harvard.edu wrote:
not sure what you are trying to do or why you would want to smooth the prob map
On 05/24/2017 05:03 PM, Trisanna Sprung-Much wrote:
Hi there
I labelled sulci in 40 T1 volumes and have created surface overlays using mri_vol2surf and then registered these to fsaverage using mri_surf2surf. I want to generate a statistical probability map using mri_concat and then mris_fwhm for each sulcus. What is an acceptable FWHM to use? It is the width of a sulcus on a pial surface of an individual brain, i.e. about 2mm? Or on fsaverage, i.e. about 7mm?
Thanks Trisanna
-- Ph.D. Candidate McGill University Integrated Program in Neuroscience Psychology
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 greve@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.