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Fig. 2 —Graph shows curves of scanning delay versus mean change in
attenuation for pancreatic and liver parenchyma. Mean change in attenuation of
pancreatic parenchyma increased constantly at 5-15 seconds, peaked at 15-20
seconds (84-85 H, respectively), and then decreased with time. Mean change in
attenuation of pancreatic parenchyma in first phase was significantly higher
(p < 0.001) 15 seconds than it was 5-10 seconds after bolus
tracking was triggered and in second phase was significantly higher
(p < 0.005) 20 seconds than it was 30 seconds after bolus tracking
was triggered. Mean change in attenuation of liver parenchyma gradually
increased at 5-30 seconds, reached 61 H at 45 seconds, and then reached
plateau. Scanning delay is defined as time after bolus-tracking program
detected threshold enhancement of 50 H in aorta.
