There is a sub-capsular uptake of contrast material during the arterial phase of a triple-phase CT scan of the liver.

The sentence is a bit clumsy to translate because the radiologist is using medical "street language" for the sake of brevity. For example, he says "contrast" in lieu of "contrast material", "arterial" instead of "arterial phase" and "hepatique sous-capsulaire" instead of "sub-capsular part of the liver".