Hello rtk users, I have question to the RTK FDK Filter. As far as I understand from to the fourier slice theorem the object to be reconstructed needs a circular trajectory and needs to rotate its own centre.
Please have a look at the attached sketch. With this planar trajectory (Object, a PCB, is moved on a circle trajectpry "in-plane", PCB itself is not rotating) do I need a special filtering if I want to use FDK for planar CT with respect to the sketched trajectory ? I tried a circular in-plane trajectory where the PCB is centred and rotates around its centre point. And with 100 projections I get good results. But with the trajectory I described (sketch, attached image) the results are not so good. Because of the row-wise ramp filter It looks like there is a directional dependency. My assumption is, and with respect to fourier slice theorem, that the missing object rotation (rotation around itself) causes there directional effects. So my questions to the experts are. Do I need to apply a special filtering before backprojecting with FDK or is it just the wrong algorithm for this kind of trajectory ? kind regards, Robert C.
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