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Table 4 Noise level of a large VOI (, 3.0 cm) placed in the liver and the SNR with all lesion sizes averaged are presenting for TOF-OSEM (3 iterations, 16 subsets, post-filter 5.0 mm and PSF) and BSREM with β = 750 (including TOF and PSF). Reference values measured in a healthy liver

From: Noise reduction using a Bayesian penalized-likelihood reconstruction algorithm on a time-of-flight PET-CT scanner

 Noise (14.137 ml)SNR (lesion size averaged)
Time (min)aOSEMβ750OSEMβ750
2.50.4430.22820.25641.710
5.00.3180.15615.08829.092
100.2170.10910.24319.448
  1. aTotal of nine range of times per bed position