[Insight-users] BSpline deformable transform Helper class

[Luis Ibanez]

Hi Federico,

Could you please elaborate a little bit more on what you
are trying to do ?

 From your description, it seems that you have a curve in 3D
that you want to deform in order to match a feature of a
3D image.  Is that right ?

Is this like trying to fit a 3D curve to a blood vessel in
a 3D image ?

If you only need to map the point of the 3D curve into the
image, then using a BSpline deformable transform for this
purpose may be an overkill.

You may find more useful to apply the any of the KernelTransforms
that are basically landmark-based transforms. You could select
key point from the 3D curve and map them to key locations in the
3D image. Then use this collection of point-pairs as fixed and
moving landmarks to feed a KernelTransform. Finally use that
transform form mapping all the intermediate points form the curve.

Please let us know if this may make sense in the context of your
application.


    Thanks


       Luis


------------------
fjlb at duke.edu wrote:
> Hi all,
> 
> I've been trying to implement the bspline transform regularly and now with the
> helper class published a couple of days ago. Basically I have a curve in 3D
> represented by a line spatial object that I want to register to a fixed image.
> I'm using the spatial object to image registration framework to align the curve
> to the image. My main problem is how to create the grid in which the curve to be
> deformed sits. Ideally I want to have the same number of control points than
> pixels within  the grid. Say, if I have a 3x3x3 cubic grid then I want 4x4x4
> control points. I want to know how to initialize this type of procedure and if
> the helper class would be useful for my usage.
> 
> Thanks,
> 
> 
> Federico
> 
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