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. Author manuscript; available in PMC: 2020 Apr 29.
Published in final edited form as: Biomed Phys Eng Express. 2019 Mar 12;5(3):037001. doi: 10.1088/2057-1976/ab0926

Table 1.

Quantification index (TV(R2)/TV(R1)) for the lower noise level (4 × 106 counts).

Algorithm 10 iterations 100 iterations 500 iterations 1000 iterations 10 000 iterations
ML-EM 1.1692 0.7815 0.4824 0.4514 0.3663
Green (β = 0.1) 1.4678 4.6211 5.3305 5.3996 5.3505
Proposed (β = 0.01) 0.9724 0.9566 0.9141 0.9207 0.9624