[Insight-users] help for Registration

[Mohammad Mayya]

Hi again,

I would go for Brian's first suggestion (as Massi expected).
You still need to consider some issues when following such approach (and
that also depends on why do you need to match those two images):
- As you will re-mesh your PET images, you won't probably have the same
reference p(0,0,0) for both meshes. So, you should properly initiate the
registration by performing some alignment like translation + rotation.
- Now you have your meshes aligned with each other, you can perform a rigid
registration (also translation + rotation) but this time by minimizing the
"distance" between the landmarks on one of the meshes and their
correspondences on the other.
- You may go further (depends on your requirements) and perform an affine
transformation or even a non-rigid registration. Note that this will deform
your data.

Sorry for not providing hints about employing itk into this, I am a new
user of this library.

Enjoy!

Mhd

On Thu, Sep 13, 2012 at 9:47 PM, brian avants <stnava at gmail.com> wrote:

> massi
>
> it just occurred to me that it is possible to go the other way as well
> --- i.e. convert your mesh to an image and then register the images
> standard methods.   e.g. ANTs or some ITK basics.
>
> to try this approach , see :
> ITKv4/Modules/Core/Mesh/include/itkTriangleMeshToBinaryImageFilter.h
>
> i am not sure which approach will be easier.  however, both will
> probably lead to some issues with physical space / orientation which
> you will probably have to resolve in some customized manner.
>
> brian
>
>
>
>
> On Thu, Sep 13, 2012 at 3:30 PM, Massi <Massinissa.Bandou at usherbrooke.ca>
> wrote:
> > Thanks Brian!! I will try this!!
> >
> >
> > Massi
> >
> >
> >
> > --
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