Journal
INVESTIGATIVE RADIOLOGY
Volume 41, Issue 4, Pages 384-390Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/01.rli.0000197981.66537.48
Keywords
blood-pool contrast agent; contrast enhancement; micro computed tomography; small animal imaging; in vivo imaging
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Objective: The objective of this study was to determine the time-course of computed tomography (CT) contrast enhancement of an iodinated blood-pool contrast agent. Methods: Five C57BL/6 mice were anesthetized, imaged at baseline, and given an iodinated blood-pool contrast agent. Micro-CT scans were acquired at 0, 0.25, 0.5 1, 2, 4, 8, and 24 hours after injection. The mean CT number was determined in a region of interest in 7 organs. Results: The CT contrast enhancement was plotted as a function of time for each organ. We identified an imaging window immediately after injection suitable for visualizing the vascular system and a second imaging window at 24 hours for visualizing liver and spleen. Conclusions: A single injection of the blood-pool contrast agent can be used for dual-phase investigations of the vasculature (t = 0 hours) and liver (t = 24 hours), which can be applied to Studies of liver tumors or disease.
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