Fig. 3
Comparing COV in the phantom background compartment measured at several scan durations, in graphs with standard scale (a) and log-log scale (b). A power-law fit resulted in COV = 1.26 T −0.51. The coefficient of determination r 2 was 0.98, which indicates a good fit of the trend line to the data. Using the fit result, [B true] = 1.84 kBq/mL and COVmax = 0.15, formula 1 resulted in T min = 62 s. The log-log scale graph can be described by log (COV) = log (a) − b · log (T) in which the steepness of the curve is described by (b)