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Fitted time attenuation curves of the aorta from a representative animal for protocols A, B, C and D. The dotted line at 100 HU represents the bolus tracking threshold level; the dotted line at 300 HU represents the diagnostic target attenuation. The diagnostic window (enhancement > 300 HU) is comparable for all protocols (7–9 s), and the bolus tracking delay time is shorter for protocols C and D than that for protocols A and B.
