[Rtk-users] RTK simulated geometry BrainLab ExacTrac

[Simon Rit]

Hi,
Yes ! I have actually added that functionality recently from Thibault
Notargiacomo's code <https://github.com/gnthibault/RTK> see
bool rtk::ThreeDCircularProjectionGeometry::AddProjection ( const
HomogeneousProjectionMatrixType &  pMat)
<http://www.openrtk.org/Doxygen/classrtk_1_1ThreeDCircularProjectionGeometry.html>
Note that the projection matrix must be for a 3D position in mm to a 2D
position in mm. You can add pre-/post-matrices to go from mm to voxel.
There is no command line tool to do it but you can easily create your
command line tool to do it. This is tested in
testing/rtkgeometryfrommatrixtest.cxx.
Let me know if you need more info,
Simon

On Thu, Nov 17, 2016 at 11:08 AM, Freislederer, Philipp <
Philipp.Freislederer at med.uni-muenchen.de> wrote:

> Dear all,
>
>
>
> I currently have some issues in generating off-plane projections where I
> think rtk might be helpful.
>
> I am trying to generate projections from an Brainlab ExacTrac geometry.
>
> What I am getting is a projection matrix generated by the system itself.
> Using only this information I am able to project any voxel value in a CT
> onto a panel.
>
> Now, in order to speed everything up a little and not re-implement
> everything that has been done sufficiently already I am hoping to use
> ‘rtkforwardprojections’.
>
> The problem is I am not able to reproduce the Brainlab geometry using
> ‘rtksimulatedgeometry’ from the projection matrix directly.
>
> I could calculate the room angle of the source to the panel from the
> projection matrix but I am getting weird results when applying these on
> something like plastimatch, so I think I have an error in there.
>
>
>
> Is there a way of creating a geometry simply from the projection matrix or
> do I have to work around and calculate every parameter needed specifically?
>
> Maybe someone has some experience with this type of issue.
>
>
>
> Thanks in advance!
>
>
>
> Philipp
>
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