[Insight-users] Rigid3DPerspectiveTransform

[Boettcher, Dr. Peter]

Dear Bill

 

Yes I already used the Insight/Examples/DigitallyReconstructedRadiograph1.cxx example. Unfortunately I have problems defining the proper transformation. Instead of transforming the object (e.g. bone volume) the virtual C-arm is rotated as well as translated around the image volume. When I define only a rotation or a translation every thing works fine. However when I apply both rotation as well as translation the result is not what I expected. 

 

Using a parallel projection for the generation of DRR would be of less value for me as I would like to match those DRRs to a real fluoroscopic image. In fact I must admit that I miss a function like itkRayCaster-SetViewAngle(). As the itk::ResampleImageFilter defining the dimensions as well as the image resolution of the DRR is generated after the itk::RayCaster has done its work suggests, that the projection angle at which the RayCaster calculates the DRR is fixed.

 

However if anyone could explain me the proper usage of DigitallyReconstructedRadiograph1.cxx, maybe that will solve my problem. Anyway I thought using itk::Rigid3DPerspectiveTransform would be more efficient as it has been especially designed to generate DRRs ;-)

 

 

 

Regards, Peter.

 
 

________________________________

Von: Bill Lorensen [mailto:bill.lorensen at gmail.com]
Gesendet: Mo 21.04.2008 18:42
An: Boettcher, Dr. Peter
Cc: insight-users @ itk. org
Betreff: Re: [Insight-users] Rigid3DPerspectiveTransform



Peter,

I the past at GE, we generated DRR's using the ExpNegativeImageFilter
and AccummulateImageFilter. These resulted in parallel projections
along each of the major planes, not Perspective projections. I do
recall that we also successfully generated arbitrary DRR's with
Insight/Examples/DigitallyReconstructedRadiograph1.cxx. I have no
experience with similar code in InsightApplications. Which code were
you using in InsightApplications?

Bill

On Mon, Apr 21, 2008 at 11:13 AM, Boettcher, Dr. Peter
<Boettcher at kleintierklinik.uni-leipzig.de> wrote:
>
> I try to use Rigid3DPerspectiveTransform for the generation of digitally
> reconstructed radiographs (DRR). The example within the ITKApplication uses
> the RayCaster instead of Rigid3DPerspectiveTransform. Searching the mailing
> list as well as the web I did not find any example on how to use that
> filter. The testing script does only transform points and not an image
> volume.
> I suppose I will have to declare Rigid3DPerspectiveTransform as my
> transformer. In additon to that I will need an image resample filter and an
> interpolator. However pluggin those components together does not work.
>
> ImageResampleFilter->SetTransform(Rigid3DPerspectiveTransform) does ot
> compile.
>
> Regards, Peter.
>
>
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