Should the phase image be in rads? and does the magnitude image need to be skull-stripped first?


On Fri, May 3, 2013 at 12:30 PM, Corinna Bauer <corinnab83@gmail.com> wrote:
thanks Doug, I will give that a try.


On Fri, May 3, 2013 at 12:27 PM, Douglas N Greve <greve@nmr.mgh.harvard.edu> wrote:
Create the B0 voxel shift map. Call it b0dcmap.nii.gz and put it in
the bold folder, eg:

epidewarp.fsl \
 --mag mag.nii.gz \
 --dph dphase.nii.gz \
 --tediff YOUR_TE_DIFF --esp YOUR_ESP  \
 --vsm bold/b0dcmap.nii.gz

When you run mkanalysis-sess and preproc-sess, add "-b0dc" to the
command lines.

doug


On 05/03/2013 12:16 PM, Corinna Bauer wrote:
Yes, I am using FSFAST.


On Fri, May 3, 2013 at 12:08 PM, Douglas N Greve <greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>> wrote:


    Hi Corinna, are you using FSFAST? If not, are you still going to the
    surface?
    doug

    On 05/03/2013 11:07 AM, Corinna Bauer wrote:
    > Is there a way to correct fmri data for epi distortions in
    freesurfer?
    > Or does the data need to be first fun through FSL's B0 unwarping?
    >
    > Corinna
    >
    >
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