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Table 2 Geometrical density (in %) of \(\underline {\boldsymbol {K}}\) and Aλ with Nj=9×9,NE=4

From: Algorithms for joint activity–attenuation estimation from positron emission tomography scatter

N d 2 4 8 16 32 64 128
\(\underline {\boldsymbol {K}}\) 4.30 4.30 3.80 3.16 2.78 2.15 1.42
A λ 33.6 34.5 26.8 22.1 18.9 14.3 9.19
  1. Flat activity sources λ covering the complete FOV were used for Aλ to establish an upper bound