hmmm, I agree with Doug. Why would you want to smooth? The probability maps will have their own smoothness, which will reflect how well they register across subjects
cheers Bruce On Wed, 24 May 2017, Trisanna Sprung-Much wrote:
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 [cleardot.gif]
-- Ph.D. CandidateMcGill 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 > > > >
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