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One-pixel wide line profiles through the centers of cold spheres with 7, 14 and 3-pixel radii in transaxial cross-sections (slice 49) of: (a) the high-noise phantom; (b) image reconstructed using PAPA from the high-noise phantom data; (c) image reconstructed using the nested EM-TV from the high-noise phantom data; and (d) image reconstructed using conventional EM-TV from the high-noise phantom data.
