[Insight-users] Problem with Demons deformable registration

[Luis Ibanez]

Hi Xuanaux,


A)  What pixel type are you using for the image types
      in the template instantiation of the Demons filter ?


B)   Have you verified the content of the resampled moving
      image after the rigid registration ?
      It could well be that such image is outside of the
      extent of the fixed image and it was resampled to
      an empty value


C)  What value are you using for the Default pixel value
      in the Resample Image filter ?
      (after the rigid registration )

D)   For how many iterations is the Demons filter running ?


E)    Please try writing the image to a file format different
       from DICOM (for example, .mha, .vtk, .nrrd, .nii) and
       use a standard image application (such as Slicer)
       to look at the content of the image.   That will help us
       rule out DICOM (or not) as the source of the problem.



   Please let us know,


         Thanks


            Luis


--------------------------------------------------------------------------------
On Wed, May 26, 2010 at 6:13 PM, xuanaux <xuanaux at gmail.com> wrote:

>
> Hi, guys
>
> I am trying to use Demons registration filter to register two 3-D volume
> images of heart. Heart volume images were segmented from CT scans of whole
> body. Rigid registration was first applied to make a global registration of
> two images. Transformed moving image and original fixed image were used as
> moving and fixed images of Demons algorithm. However, when I write back the
> resulting image to the DICOM files, the resulting image has constant value
> of 1024, which is apparently not correct. I did check the two inputs images
> to the Demons filter. They have the same origin, orientation and spacing. I
> have no idea what is going wrong.
>
> Could any one give me any suggestion of the possible problem? Thanks in
> advance!
>
> Attached please find the code of Demons registration part.
>
> http://itk-insight-users.2283740.n2.nabble.com/file/n5106037/code-Demons.txt
> code-Demons.txt
> --
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