Hi Yunxin

could you cc the list so that others can answer? I don't think you will be able to get a reasonable surface out of a discretized 256*3 volume for the pial surface. There are many, many places where the pial surface comes within a fraction of a mm of itself that you will not be able to represent.

cheers
Bruce

On Tue, 6 Aug 2013, Yunxin Wang wrote:

Hi Bruce,
Thanks for your response. Actually I want to use the fast marching toolbox
to further analyze the pial surface that FreeSurfer has reconstructed
automatically, but according to the procedure only the pial surface will be
used for fast marching process and I found out the input file of fast
marching is a 256*256*256 matlab file which I could just load in matlab but
couldn't see any detail. Do you think I can use the freesurfer_read_surf
function in matlab to transfer the surface? 

Best,
Yunxin


2013/8/5 Bruce Fischl <fischl@nmr.mgh.harvard.edu>
      Hi Yunxin

      the surface lives in a continuum and is 2D. Do you mean filling
      the space between the ?h.white and ?h.pial surfaces? We do that
      as part of recon-all and create ribbon volumes in the mri dir
      cheers
      Bruce


      On Mon, 5 Aug 2013, Yunxin Wang wrote:

            Hi dear all,
            I'm new here and I've a simple question that how
            could I transfer the reconstructed pial surface
            file(like lh.pial) into a
            256*256*256 matlab matrix used in later fast
            marching process?

            Any suggestion will be appreciated!
            Thank guys.

            Best,
            Yunxin Wang






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