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Sample axial slices of OS-EM (10 iterations, 32 subsets) reconstructed images for (left to right) the optimal collimator with noise-free data, optimal collimator with noisy data, Precedence HEGP collimator with noise-free data and Precedence HEGP collimator with noisy data corresponding to 1500 MBq total activity and 30 min imaging time. The second and forth images were filtered using a 3D Butterworth postreconstruction filter with order 8 and cutoff 0.2 pixel−1.
