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Fourier Based Forward and Back Projectors in Iterative Fan Beam Tomographic Image Reconstruction

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Figure

Fig. 1. Angular coordinates in fan-beam geometry.
Fig. 2. Basic steps of NUFFT forward projection in fan-beam CT. 1) Two-dimensional NUFFT of image to obtain polar spectrum samples
Fig. 3. Simulation results for forward projectors of image size 512 �Case 2: sinogram size of 888 bins by 984 views
Fig. 5. QPWLS-CG reconstruction (200 iterations) for Shepp-Logan phantom with projectors from case 2: noiseless data, square pixels.
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