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Fig. 4. —51-year-old woman who underwent abdominal CT (same patient as shown in Fig. 1). Graph shows aortic density curve. First cluster of circles represents bolus-triggering data; subsequent three clusters were measured from arterial (5 mm), early parenchymal (8 mm), and late parenchymal (5 mm) scans. Horizontal line indicates aortic density taken as b(t) for calculation of CT clearance, which was calculated as mean value of all data points acquired during scanning of kidneys. Area under curve needed to be measured for integrals t = 0 to t1, t = 0 to t2, and t = 0 to t = t3; t1, t2, and t3 were defined as midpoint of each kidney scan (vertical lines).