Hi, I tried to run the application rtkfdk to reconstruct CBCT from 180 projections (from 0 degree to 180 degree only) that were generated using Gate simulation. Here is the geometry of the simulation:
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 I used rtksimulatedgeometry application to generate the geometry xml file following the simulation geometry with the command: rtksimulatedgeometry -n 180 --arc 180 -o geo.xml --sid 80 -sdd 160 --proj_iso_x -30 --proj_iso_y -30 Subsequently the CBCT was reconstructed with the rtkfdk application with the command: rtkfdk -g geo.xml -p . -r proj.mha -o test.mha --spacing 0.1 0.1 0.2 --dimension 160,160,100 --origin -8 -8 -10 However, the reconstruction result does not look correct. Particularly the axial and sagittal views have a lot of streaks. For your reference, I am sharing the snapshots of the projections and the reconstructed CBCT in the following link: projection screenshot: https://ibb.co/PCTjzrt reconstruction screenshot: https://ibb.co/QCjjvQt What did I do wrong or miss? Or streaks are due to partial projections, ie, only 180 views? Your help would be greatly appreciated. Best, Howard
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