Fig. 4
RCA50 and RCmax values as a function of the sphere diameter for acquisitions performed with a fixed scan duration of 180 s per bed position. Iterative reconstruction setups without Gaussian smoothing (a and b) and comparison of Gaussian vs. non-Gaussian setups for devices that used the Gaussian smoothing in the clinic (c and d). Digital devices were labeled with full lines and dashed lines represent the obtained results with analogue devices. Upper and lower RC boundaries specified by the EANM/EARL accreditation protocols are labeled with black dashed lines. EARL RC values (black dashed lines) refers to January 2017 version as reported in the EARL website [17]