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Fig. 1 —Graph shows curves of scanning delay versus mean change in
attenuation. Mean change in attenuation of aorta (327 H) and of superior
mesenteric artery (307 H) peaked 10 (p < 0.05) and 5 seconds
(p < 0.01), respectively, after bolus tracking was triggered and
then decreased with time. Mean change in attenuation of splenic vein (183 H)
and main portal veins (148 H) peaked at 25 seconds (both p <
0.05). Mean change in attenuation of superior mesenteric vein (158 H) peaked
at 30 seconds (p < 0.001). Scanning delay is defined as time after
bolus-tracking program detected threshold enhancement of 50 H in aorta.
