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(a) and (b) are scatter signals of a HN patient simulated using gDRR with 5 × 108 and 5 × 1010 source photons. (c) shows the denoised scatter image from simulations in (a). (d) and (e) show the signal profiles along the u and the v axes, respectively. (f) is the comparisons of the denoised scatter image profiles along the u axis with various number of photons.
