[Insight-users] Applying two 2D registration transforms into a 3D image

[Luis Ibanez]

Hi Ganesh,

Thanks for the detailed description of the problem that you are working on.

Unfortunately, the deformation fields of the two 2D deformable registrations
do not carry enough information for you to do a 3D deformation of the T1
and T2 original 3D-images.


Any reason for not doing real 3D deformable registration in the
original images ?

[...ITK will do registration on N-D images...]


   Please let us know,


         Thanks


               Luis



------------------------------------------------------------------------------------
On Wed, Apr 7, 2010 at 1:06 PM, Ganesh Narayanasamy
<nganesh76 at hotmail.com> wrote:
>
> I have a pair of 3D-CT images acquired on a phantom with some internal
> changes (known).
> A 2D-DRR (digitally reconstructed radiograph)  image is constructed such
> that the pixel value on the DRR image should be given by the accumulated
> intensities of the 3D image volume along the direction. With the T1 or fixed
> 3D-CT image, we have created two such DRRs, say along the XZ and YZ axes.
> Let us call these 2 DRRs as T1DRR_XZ and T1DRR_YZ.
>
> Likewise, we have created 2 DRRs from the T2 3D-CT image namely, T2DRR_XZ
> and T2DRR_YZ.
>
> Using a deformable 2D registration model (say, Bspline), we would like to
> register T1DRR_XZ with T2DRR_XZ and also T1DRR_YZ with T2DRR_YZ. From these
> 2 transformations along the 2 orthogonal planes (XZ and YZ), is it possible
> to "compute" the 3D transform between the two 3D-CT images ?
>
> Can I then "apply" these two 2D transforms or the single computed 3D
> transform into the T1 image to obtain a T(T1) image that is comparable with
> the T2 image.
>
> Thanks a ton,
> -Ganesh
>
>
> ************************************************************************
> "What the mind of man can conceive and believe, It can achieve" - Napolean
> Hill
> -Ganesh Narayanasamy,Ph.D., PostDoc-University of Kentucky Cancer Center
> Earlier work: http://www.sciencedaily.com/releases/2007/05/070504133017.htm
> ************************************************************************
>
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