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Figure 1: (a) An illustration of the cross-section of the cold-sphere hot-background phantom used in this study. (b) A projection simulated by SIMIND Monte Carlo program. (c) A slice (slice 64) from reconstructed image by MATLAB software

Figure 1: (a) An illustration of the cross-section of the cold-sphere hot-background phantom used in this study. (b) A projection simulated by SIMIND Monte Carlo program. (c) A slice (slice 64) from reconstructed image by MATLAB software