[Insight-users] Re: deformable registration

[Silvester Czanner]

Hi Luis,

could you, please write me, where can I find more information about 
KernelSpline transforms (ThinPlate splines). I checked the ITK 
UserGuide. Unfortunately,  there is not too much written about it.

Thank you,

Silvester

Luis Ibanez wrote:

> Hi Silvester,
>
>
> It depends on what deformable registration method you use from ITK.
>
>
> A) Demons
> B) FEM
> C) BSpline transform
> D) KernelSpline transform
>
>
> In the case of  DEMONS and FEM, you get ast output a deformation field.
> Using this deformation field you could identify the displacements of
> particular points in the moving image.
>
> These two methods, however will not use any landmark information
> during the registration process. In practice you can simply connect
> an observer to the registration and at each iteration print out the
> displacement vectors corresponding to your set of landmarks.
>
>
> In the case of BSpline transforms used with the basic registration
> framework, you can use the BSpline transform as computed at each
> iteration of the optimization process, and again map a set of
> landmarks in  order to evaluate their displacements.  The landmarks
> will not be used for stering the registration process, they will
> only be probes / observers that will allow you to see how the
> registration is progressing.
>
>
> In the case of KernelBase transforms, like the ThinPlate spline
> and its family, you actually use landmarks as part of the registration
> process. In this context you could associate your landmarks to
> the source and target landmarks used by the transform.  The optimizer
> will update the coordinates of these landmarks in order to optimize
> the image metric.
>
>
>
> Please let us know if you have further questions,
>
>
> Thanks
>
>
>   Luis
>
>
> --------------------------
> Silvester Czanner wrote:
>
>> Hi Luis,
>>
>> I have two grayscale volumes, which I would like to register using 
>> deformable registration methods from ITK.
>> Is it possible in ITK to localize some correspondent landmarks before 
>> deformable registration and during the registration process to track 
>> the trajectories of those landmarks?
>>
>> Silvester
>>
>
>
>
> _______________________________________________
> Insight-users mailing list
> Insight-users at itk . org
> http://www . itk . org/mailman/listinfo/insight-users
>

-- 

Silvester Czanner, PhD

Pittsburgh Supercomputing Center    | tel. +1 412 268 3496
Carnegie Mellon University          | fax  +1 412 268 5832
4400 Fifth Avenue,                  | czanner at psc . edu
Pittsburgh, PA 15213, USA           | http://www . psc . edu/~czanner

... the life would be much simpler, if we had a source code for it ...