Fig. 9
From: Algorithms for joint activity–attenuation estimation from positron emission tomography scatter
Joint estimation results for low-attenuation (rat-sized, left) and high-attenuation (human-sized, right) phantoms (as in Fig. 4). Reconstructed electron density maps (top) and activity images (bottom) after (a) 100 sub-iterations (5 iterations) of the 2-algorithm; (b) 1000 sub-iterations (50 iterations) of the 2-algorithm; (c) 100 sub-iterations (50 iterations) of the 4-algorithm; (d) 1000 sub-iterations (500 iterations) of the 4-algorithm