Fig. 2From: Head-to-head comparison of a Si-photomultiplier-based and a conventional photomultiplier-based PET-CT systema The ratio between the Discovery MI (DMI) and the Discovery 690 (D690) of the spherepeak/backgroundpeak ratio for acquisition times 600–15 s/bed in the NEMA body phantom. The hot spheres had diameters of 10–22 mm and the phantom was filled with SBR 10:1 with 18F-FDG. b Images of the phantom with 600 and 60 s per bed position at an SBR of 10:1Back to article page