Hi, I would rather suggest another version of AddProjection <http://www.openrtk.org/Doxygen/classrtk_1_1ThreeDCircularProjectionGeometry.html#a0fb1475ed76a28cde24fac85eae18e1e> which uses the source position, detector origin position, u and v vectors. Be aware that FBP assumes that the rotation is around y, I'm sure that it won't work for random geometries. If what is important is to have a final volume in the correct orientation, you can always change its direction and reset it to identity after reconstruction. I hope it helps, Simon
On Fri, Feb 25, 2022 at 1:00 PM pmkc...@yandex.ru <pmkc...@yandex.ru> wrote: > Dear developers, > > For DRR image calculation i use a ThreeDCircularProjectionGeometry class > with AddProjection method. The default rotation direction is around > Y-axis in LPS coordinates (Z-axis in RAS coordinates in 3D Slicer) as i > understand from the documentation. Should i calculate rotation matrix > manually (using gantry, in-plane, out of plane angles) and then use > AddRotationMatrix method to simulate movement of gantry angle around the > Y-axis in RAS coordinates (and couch angle rotation around Z-axis in RAS > coordinates)? Are there any other options to setup a required axis of > rotation of the gantry? > > Best regards, > > Mikhail > > > _______________________________________________ > Rtk-users mailing list > Rtk-users@public.kitware.com > https://public.kitware.com/mailman/listinfo/rtk-users >
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