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Plots of overall NSD (noise) versus Bias curves of reconstructed brain images (from top to bottom) changing with the iteration number (increasing iterations of 1, 2, 3, 5 and 10 (16 subsets)), using: (i) conventional MLEM reconstruction, (ii) conventional MAP reconstruction (SP-MAP) and (iii) the proposed MAP reconstruction (JP-MAP). Regularization was optimized for both conventional and proposed MAP reconstructions to provide a fair comparison.
