Hi Freesurfer experts,
I have a 3D fiducial surface ('anatomical' surface configuration), based
on this fiducial surface ,let's say, "template", I generated some
simulated fiducial surface with some deformation, let's say "subject". So
here I know the "deformation vectors" for each vertex between the template
and the subject in the original 3D fiducial surface "space". Then I use
FreeSurfer to generate the spheres and do spherical registration from those
subjects to the template. I want to check how these " deformation vectors "
I got from Freesurfer are different from my generated "deformation vectors".
But the problem for me is, after Freesurfer registration, the " deformation
vectors" is based on the spherical space. While my generated "deformation
vectors" are in the 3d fiducial surface space, it's not comparible for these
two vectors. I want to know whether I can put the deformed subject sphere
back into the fiducial surface representation. In that way, I can calculate
the difference in the fiducial space. If getting the deformed subject
sphere into the fiducial surface space is not possible, could you give me
some suggestions about how to calculate the difference of the deformation
vectors which are not in the same space? Generating the deformation
vectors in the spherical space is the last thing I want to do because you
never know how it likes in the real fiducial surface representation.
Thank you.
Jidan
On Mon, May 4, 2009 at 8:48 PM, Zhong Jidan <jid...@gmail.com> wrote:
> Hi,
>
> I have a question about the sphere registration. The registration of
> surface is spherical registation, so the outpput of the surface is
> also a sphere. When we have the inflated and smoothwm, we can convert
> the surface into sphere using mris_sphere, but reversely, how to
> convert the deformed sphere in the form of white surface or pial
> surface?
>
> Also, if I want to use the surface between the white and pial surface
> to do registration, do I need to make the sphere myself?
>
> Thanks,
>
>
> --
> Regards,
>
> Jidan
>
--
Regards,
Jidan
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