What is a Tri-phasic ct scan?

A tri-phasic CT scan is a scan which will show three different stages of dye uptake in the body. The first phase will be before the injection of the dye, the second stage will be for when the dye is in the arteries (roughly 20 seconds after injection) and the third phase will be when the dye has reached the veins (a few minutes later). Sometimes a fourth scan is also done to show the dye uptake in the kidneys and bladder.

A tri-phasic scan clearly delineates lesions in the liver and will show problems and irregularities in the arterial and lymphatic system.