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Integrated intensity in the ROI: (a) Backprojection; (b) ML-EM. The number of 511 keV gamma rays (generated in the left ROI) was fixed and the number of 171 keV gamma rays (generated in the right ROI) was varied from 0% to 10% the number of 511 keV gamma rays. The x-axis represents the ratio of number of generated 171 keV gamma rays to number of generated 511 keV gamma rays.
