Fig. 7From: Optimisation of CT protocols in PET-CT across different scanner models using different automatic exposure control methods and iterative reconstruction algorithmsVisual grading characteristic curves comparing each combination of SAFIRE strengths. a Strengths 3 vs 2. b Strengths 4 vs 3. c Strengths 4 vs 2. The dashed lines indicate the 95% confidence intervals. For identically scored images, the curve would fall along the grey line of equality shown in the graphsBack to article page