Thanks very much for your response, Bruce. We already collect T2 in our scanner -- not sure about FLAIR. Is there a way for them to work analogously with the mri_make_surfaces command (as outlined here)?:

FreeSurfer command to correct dura:
    mris_make_surfaces    –dura filename_%d.mgz
                -${lastecho}
                -aseg aseg.auto.mgz
                -mgz
                -sdir ${SUBJECTS_DIR}
                -output _dura_1and${lastecho}
                $({target} ${hemi}
where filename_%d.mgz refers to the four separated echoes of the MEMPRAGE and lastecho = 4
Generates:
    lh.pial_dura_1and4, rh.pial_dura_1and4,
    lh.white_dura_1and4, rh.white_dura_1and4

Thanks again for your help!

On Tue, May 7, 2013 at 2:24 PM, Bruce Fischl <fischl@nmr.mgh.harvard.edu> wrote:

Hi Katie

I'm really not sure. These days I would recommend a highres (e.g. 1mm isotropic) FLAIR if you can get one, or T2 if not. The T2* can help, but it's pretty noisy in brain.

cheers
Bruce

On Tue, 7 May 2013, Katie Surrence wrote:

Dear Freesurfer gurus,

At the course, André van der Kouwe mentioned in his morphometry methods talk that T2* weighted contrast from
MEMPRAGE could be used to further seperate dura from cortex, as also discussed in this paper:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2408694/. We have a GE scanner in our lab. The internet suggests
that a Multi-echo FSPGR/FGRE exists. Would this be the analog? Would it work the same way? Could you also
use these images with the mris_make_surfaces command?

Thanks very much for your insight -- and I enjoyed the course!

/Katie Surrence

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