Fig. 2
Top—The mean activity concentration of the myocardial compartment of the phantom plotted against A FOV and singles rate showing evidence of count-rate losses above approximately 60 Mcps. The solid grey line shows the average activity concentration at count rates < 60 Mcps. The dashed line shows 10% bias from this average activity concentration reached at singles rates > 60 Mcps. Error bars represent 1 standard deviation of the mean activity concentration of the volume of interest. Bottom—Scanner live-time fraction against A FOV and singles rate averaged over each 5-s frame showing the effect of high count rates on the ability to process true coincidence events