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Tissue/Plasma Ratio

This auxiliary model simply divides the tissue TAC at each frame mid-time by the interpolated plasma activity at the same time and displays it as a curve called Tissue/Input curve Ratio.

Under equilibrium conditions this ratio is equal to the total distribution volume of tracer in tissue. Therefore, the plot of the Tissue/Input curve Ratio against time is a quick means to check whether the system has equilibrated (plot becomes constant) or not.