Fig. 1From: NEMA NU 2–2007 performance characteristics of GE Signa integrated PET/MR for different PET isotopesNEMA counting rate measurements: count rates (a) and scatter fraction (b) vs activity concentration for the both isotopes 18F and 68Ga. Notice than peak of the NECR curve (a) of 68Ga is lower (at clinical NECR) and appears at higher activity concentrationsBack to article page