[Freesurfer] images with poor resolution

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