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. Author manuscript; available in PMC: 2023 Nov 1.
Published in final edited form as: IEEE Trans Med Imaging. 2022 Oct 27;41(11):3289–3300. doi: 10.1109/TMI.2022.3181813

Fig. 3.

Fig. 3.

Comparison of performance of preconditioners investigated in this study. Objective function vs. elapsed CPU time in reconstructions performed with SDP-BSREM algorithm with four preconditioners: M1, M2, P1, and P2, and with 12 subsets (left) and 24 subsets (right), respectively, for the brain phantom with high count data. Preconditioners P1 and P2 were generalized from M1 and M2, respectively.