Figure 10b. Sets of six sequential 5-mm transverse CT images of enhancing porcine aorta acquired 14, 20, 26, 38, 44, and 50 seconds after (a) uni- and (b) multiphasic injections of 70 mL contrast medium in pig D (25.5 kg) qualitatively demonstrate that the multiphasic injections yielded vascular enhancement that was more uniform and prolonged than that of uniphasic injections. Aortic enhancement measurements represent the six data points at these sampling times in Figure 9b.