Fig. 3
From: Quantitative SPECT (QSPECT) at high count rates with contemporary SPECT/CT systems
System A1 (Symbia T6 with only detector 1 activated; a and c) and System B (Discovery 670, both detectors activated; b and d) observed count rates (a and b) and percentage of counts (c and d) for the different energy windows are plotted against activity. GLS1 = general scatter 1 (18–53 keV). GLS2 = general scatter 2 (53–112 keV). LS = lower scatter (112–126 keV). PP = photopeak (126–154 keV). US = upper scatter (154–168 keV). GUS = general upper scatter (168–504 keV). WS = wide spectrum (18–504 keV)