Previous Topic

Next Topic

Book Contents

Book Index

Tissue/Plasma Ratio

This auxiliary model simply divides the tissue TAC at each sampling time by the interpolated plasma activity at that time and displays it as a curve called Tissue/Plasma Ratio.

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