REDUCING ARTIFACTS OCCURRING DUE TO VESSEL OVERLAPS IN A FOUR-DIMENSIONAL ANGIOGRAPHY DATASET

A method is provided for reducing artifacts occurring due to vessel overlaps in a four-dimensional angiography dataset acquired with administration of a contrast agent, wherein distribution data relating to a concentration of the contrast agent in the blood circulatory system is generated at the respective time points for a three-dimensional vessel dataset of a blood circulatory system or for a reduced dataset derived therefrom, e.g., by a trained function. A color intensity of a pixel showing a contrast agent filling state contained in a respective projection image of the blood circulatory system is distributed according to the distribution data at the respective time point of the acquired projection image across voxels of the vessel dataset that lie along a ray associated with the pixel in the backprojection.