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Table 5 Reduction factor and CR gain for different numbers of iterations (Vision with 220 × 220 matrix size) when compared to the reference values of mCT

From: From a PMT-based to a SiPM-based PET system: a study to define matched acquisition/reconstruction parameters and NEMA performance of the Biograph Vision 450

   Contrast recovery gain (%)
Number of iterations Mean reduction factor 10-mm sphere 13-mm sphere 17-mm sphere 22-mm sphere 28-mm sphere 37-mm sphere
3 2.77 + 15% + 37% + 40% + 14% + 1% + 0%
4 1.89 + 24% + 43% + 44% + 16% + 7% + 4%
5 1.44 + 30% + 46% + 46% + 17% + 10% + 6%