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Fourier domains of cone beam projection data. The first and the second rows correspond to the head-neck and the prostate sections’ cone beam projection data, respectively. Column (a) is the cone beam projection data, columns (b) and (c) are the noise-free and noisy versions of the 3D Fourier domain, respectively. q, ξ, k are the angular frequency variables associated with u, v, β, respectively. The arrows indicate the approximately zero-energy double-wedge area.
