Thanks Darren, Stephen for the suggestions..
I have a question about one of the steps you suggested, tho:
>1) realign functionals to some common functional image if possible. Write
>out a
>mean image but don't reslice functionals at this point.
Under the realign options, if I choose coregister and reslice then all of
the functionals are resliced. If I choose coregister only, then I don't get
the option to write the mean image. Is there a way to write the mean image
without reslicing all of the functionals?
Thanks again,
Rachael
Rachael D. Seidler, PhD
University of Minnesota Dept of Neuroscience
and Brain Sciences Center, 11B
Veterans Affairs Medical Center
One Veterans Drive
Minneapolis, MN 55417
Phone: 612 725-2000 x.1765
Fax: 612 725-2291
Email: [log in to unmask]
>2) coregister T1 to the mean functional image. Don't write out a new T1
>image at
>this point.
>3) Normalize the T1.
>4) apply the normalization parameters from the T1 to your functional
>volumes-
>this will reslice the functionals. (make sure you set the normalization
>defaults
>to allow you to choose the voxel size of the functional images).
>
>You should now have normalized T1 and functional images. Assuming good
>quality
>T1 images from subjects with reasonably normal brains, and good
>coregistration
>between T1 and functionals you should have minimal distortions (or no more
>than
>were there originally).
>
>HTH,
>Darren
>
>Rachael Seidler wrote:
>
> > Hello all,
> > I'm having a problem normalizing some mri functional images that contain
> > distortions. Specifically, there is no visible data in the inf. frontal
> > region of these images.. When I normalize them to the epi template
>however,
> > everything gets stretched forward to fill in the empty space. I suspect
> > this distorts the signal outside of the original distortion region. Is
> > there a way to normalize anatomical images to the standardized space,
>and
> > then apply these parameters to the functional data? Or can anyone
>recommend
> > another fix?
> > Thanks in advance,
> > Rachael
> > Rachael D. Seidler, PhD
> > University of Minnesota Dept of Neuroscience
> > and Brain Sciences Center, 11B
> > Veterans Affairs Medical Center
> > One Veterans Drive
> > Minneapolis, MN 55417
> > Phone: 612 725-2000 x.1765
> > Fax: 612 725-2291
> > Email: [log in to unmask]
> >
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>--
>----------------------------------------------------------------------
>Darren R. Gitelman, M.D. E-mail: [log in to unmask]
>Cognitive Neurology and Voice: (312) 908-9023
> the Alzheimer¹s Disease Center Fax: (312) 908-8789
>http://www.brain.nwu.edu
>Northwestern Univ., 320 E. Superior St., Searle 11-470, Chicago, IL 60611
>----------------------------------------------------------------------
>
>
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