Figure 8b. Graphs depict empiric porcine aortic enhancement curves in pigs (a) B (24.8 kg) and (b) D (40.6 kg) obtained by using multiphasic injections of 50 mL with an initial injection rate of 2 mL/sec and decay coefficients of 0.007 (*), 0.017 (
), and 0.026 (
). (Injection profiles depicted in Figure 2.) Injection with a decay coefficient of 0.017 produced the most uniform aortic enhancement curve. Injections with lower (0.007) or higher (0.026) decay coefficients resulted in aortic enhancement curves that steadily increased or decreased after reaching a peak, respectively. Magnitude of aortic enhancement in pig B was substantially higher than that of pig D, reflecting the difference in body weight. However, patterns of aortic enhancement produced with the three exponential decay coefficients were consistent.