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Fig. 1. —Time chart for automatic bolus-tracking technique. Real-time low-dose serial monitor scans were automatically initiated 10 sec after start of injection of contrast material. CT values of region of interest specified in abdominal aorta were automatically calculated. Trigger for start of diagnostic scan was set at increase in aortic enhancement of 50H, and first arterial phase helical CT scan started automatically 10 sec after trigger level had been reached.

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