Dear Douglas

I was searching for that map, I found the curvature map, the thickness map, and so on

I don't see information about that map in the freesurfer guides

Any help is welcome

John Ochoa Bioingeniería Universidad de Antioquia

On Mon, Apr 2, 2012 at 4:47 PM, Douglas N Greve greve@nmr.mgh.harvard.eduwrote:

why don't you use the gray/white contrast map that freesurfer produces?

On 04/02/2012 04:24 PM, John Fredy wrote:

...

Dear Douglas and David,

I am trying to know the gray-white contrast in images from epileptic patients. In know that I can use the freesurfer surface to obtain the coordinates for the interface between gray-white substance, but some help is welcome because the paper that I read introduce elements like use the data 0.5 before and 0.5 after the interface

How I can convert the surface to voxel coordinates?

How I can obtain the data (0.5 mm) out of the resolution of my images (that is 1 mm)?

Any interpolation suggestion?

Exists some code that I can use

Thanks in advance

John Ochoa Bioingeniería Universidad de Antioquia

On Mon, Apr 2, 2012 at 12:12 PM, Bruce Fischl <fischl@nmr.mgh.harvard.edu<mailto: fischl@nmr.mgh.**harvard.edu fischl@nmr.mgh.harvard.edu>> wrote:

Hi John

Doug and David (ccd) can point you in the right direction once you are done with your surface recons

cheers Bruce

On Mon, 2 Apr 2012, John Fredy wrote:

   Dear Bruce,
   I have interest in the tools that you mentioned

   Best

   John Ochoa

   On Sat, Mar 31, 2012 at 5:31 PM, Bruce Fischl
   <fischl@nmr.mgh.harvard.edu <mailto:fischl@nmr.mgh.**harvard.edu<fischl@nmr.mgh.harvard.edu>

...

...

   wrote:
        Hi John

        we can provide that for you if you download and install
        FreeSurfer, then run recon-all on your data. We also provide
        tools for computing gray/white contrast once recon-all
   has been
        run.

        cheers
        Bruce

    On Sat, 31 Mar 2012, John Fredy wrote:

        Hello all, I am looking for a white-gray matter contrast
        algorithm

        I see the publication: Individual Differences in Verbal
        Abilities Associated
        with Regional Blurring of the Left Gray and White Matter
        Boundary

   http://www.ncbi.nlm.nih.gov/**pubmed/22031871<http://www.ncbi.nlm.nih.gov/pubmed/22031871>

        But,how I can obtain the coordinates of the interface
        between gray and white
        matter?

        Thanks in advance






   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<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.

-- 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/BugReportinghttp://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: www.nmr.mgh.harvard.edu/**facility/filedrop/index.htmlhttp://www.nmr.mgh.harvard.edu/facility/filedrop/index.html