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.