Hi Dana,
it looks like the gray/white density estimation failed. Try setting them with the expert opts for mri_segment and mris_make_surfaces (Nick can point you in the right direction if you can't figure it out). Things like max gm at white border and such.
cheers, Bruce
On Fri, 2 Oct 2009, Dana W. Moore wrote:
Hi everyone,
I am trying to salvage some images that were done with poor gray/white boundary contrasts. First, FreeSurfer includes an area of dura in the skull strip. I tried adjusting the watershed but it made no differences. FreeSurfer is subsequently unable to detect the gray/white boundary and labels the dura as cortex:
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Looking at the raw images, the gray/white boundaries are faint but visible. Is there anything I can adjust to try to make this work with FreeSurfer?
Thanks, Dana
Dana W. Moore, Ph.D. Neuropsychology Fellow Cornell Neuropsychology Service Weill Medical College of Cornell University New York Presbyterian Hospital Department of Neurology & Neuroscience 428 East 72nd Street, Suite 500 New York, NY 10021 Phone: 212-746-2823 Fax: 212-746-5584 Email: dwm2003@med.cornell.edu