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Fig. 2. —Schematic outline shows injection and acquisition intervals for triple-pass hepatic helical CT techniques used in this study. Injection (black bar) of 60% iodinated contrast material was performed at rate of 5 mL/sec for 30 sec (total volume, 150 mL; iodine load, 42 g). First-pass acquisition (white bar with horizontal lines) was performed using image thickness of 2.5 mm, table speed per rotation of 15 mm, and pitch of 6. Second-pass acquisition (white bar with vertical lines) was performed using image thickness of 5 mm, table speed per rotation of 15 mm, and pitch of 3. Third-pass acquisition (white bar with checkerboard pattern) was performed using image thickness of 5 mm, table speed per rotation of 22.5 mm, and pitch of 6. Pitch values relate to modified definition. In this schematic, injection-to-scan delay was 20 sec.

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