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The transmission-dispersion model visualized on a cross section of a catheter. Blood concentrations entering and leaving the catheter are denoted Ci(t) and Co(t), respectively. The fraction α of tracer entering the catheter is taken up by a stagnant layer M1(t) on the inner surface of the catheter, and later released into the bloodstream at the rate k. The fraction (1−α) flows undisturbed through the catheter with convective flow F. For time delays, see text.
