[vtkusers] Using an itkAffineTransformation as input to vtkTransform

[Boettcher, PD Dr. Peter]

Dear All 

We performed affine image registration using the itk image registration pipeline. As result we got the 16 parameters from the itkAffineTransformation. Now, we would like to feed this transformation matrix to vtkTransform and apply the transformation to a polydata model using vtkTransformPolyDataFilter. The 3D-model has been generated using vtkMarchingCubeFilter using exactly the same image volume we used for image registration as the moving volume. Both image volumes feed to the registration pipeline have been centered on global 0,0,0 coordinate in a preprocessing step (before generating the 3D-moving model). 

Our current problem is that the 16 parameters copied from itkAffineTransform to vtkTransform do not result into the same transformation of the 3D-modell than of the image volume. 

Any help would be appreciated - Peter & Sabine.
 
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Peter Böttcher, Dr med vet habil, DipECVS
European Veterinary Specialist in Surgery
Fachtierarzt für Kleintierchirurgie
Klinik für Kleintiere 
Universität Leipzig 
An den Tierkliniken 23 
D-04103 Leipzig (Germany)
Tel: +49-341-9738700 
Fax: +49-341-9738799
email: boettcher at kleintierklinik.uni-leipzig.de

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