[Rtk-users] Trying to reconstruct with a 180 degrees circular projection geometry

[Clément Mirabel]

Hi,

I have been trying to set the geometry in ThreeDCircularProjectionGeometry
with values between 0 and 180 degrees, to reproduce the motion of some
acquisition systems, but reconstruction is far from the expected result
when the gantry angle does not reach max value of (360-increment).
(Attached is the geometry file generated)

My workflow is the following :

   - Apply JosephForwardProjectionImageFilter on a 3D Volume
   - Try to reconstruct using FDKConeBeamReconstructionFilter

Although, the result from JosephForwardProjectionImageFilter describes a
180 degrees rotation, the output of the reconstruction seems to display
rays from opposite direction but not from rotated directions


Here is a view of what is supposed to be an axial slice:

[image: image.png]

Thanks for your help!

Clément
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