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Fig. 1 —Diagram illustrating timing scheme. Patients were
prospectively randomized into three groups, and scans were initiated at 5, 20,
and 45 seconds; 10, 25, and 50 seconds; and 15, 30, and 55 seconds for first
(acquisition time, 4.3 seconds), second (acquisition time, 4.3 seconds), and
third (acquisition time, 9.1 seconds) phases, respectively, after
bolus-tracking program detected increase in CT value of 50 H in aorta just
above level of diaphragmatic dome. First- and second-phase images were
obtained during single breath-hold, followed by 20-second breathing interval
before third-phase scan. Equilibrium phase scan commenced 160 seconds after
bolus-tracking trigger.
