For ART a bolus-track technique was employed with the region of interest placed at the proximal abdominal aorta; the scan was initiated 5 s after reaching a threshold of 120 HU. PVN was initiated 20 s after ART. VEN was initiated either 90 s after injection of ICM, 50 s after ART or 30 s after PVN to achieve very similar delays after injection of ICM across individual exams.

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