Hi, I think you should refer to the geometry documentation: http://www.openrtk.org/Doxygen/DocGeo3D.html In RTK, the rotation axis is y (whereas it's z in Dicom). So there is probably nothing wrong... Simon
On Wed, May 11, 2022 at 4:03 PM Howard <lom...@gmail.com> wrote: > Hi, > > I had some geometric questions about the CBCT reconstruction, but this > time it is the orientation of the reconstructed CBCT. > > I attempted to reconstruct CBCT with rtkfdk using the Gate generated Monte > Carlo projection data, but after the reconstruction the axial view becomes > a coronal view. Something is wrong in my reconstruction, either with > rtksimulatedgeometry or with rtkfdk. Here is the detail about the geometry > and the reconstruction commands. > > 1) Simulation set up: > > a cylindrical phantom (radius=8mm, height=20mm) sitting on a turntable > X-ray source to isocenter (center of the cylindrical phantom) = 80mm (SAD) > Flat panel imager (60mm x 60mm) to isocenter = 80mm (SDD=160mm) > > x direction: perpendicular to y direction which is the direction from > detector to X-ray source; > z direction: turntable rotation axis and pointing upward > > 2) rtksimulatedgeometry was used to generate the geometry xml file > following the simulation geometry: > rtksimulatedgeometry -n 360 -o geo.xml --sid 80 -sdd 160 --proj_iso_x -30 > --proj_iso_y -30 > > 3) rtkfdk was used to reconstruct the CBCT image: > rtkfdk -g geo.xml -p . -r proj_360.mha -o test.mha --spacing 0.1,0.1,0.2 > --dimension 160,160,100 --origin -8,-8,-10 > > The projection data and reconstructed CBCT are attached for your info. > Could anyone help spot what was wrong? Any suggestions or comments are > appreciated. > > Howard > _______________________________________________ > Rtk-users mailing list > Rtk-users@public.kitware.com > https://public.kitware.com/cgi-bin/mailman/listinfo/rtk-users >
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