Patent ID: 8295915

Claim:
A method for measuring a flow rate of a contrast agent in at least one vessel of a patient using a computed tomography examination, the method comprising: scanning the patient by x-rays, emitted in a fan-shape on two planes and determining absorption from a multiplicity of rotational angles while the contrast agent propagates through the at least one vessel of the patient; reconstructing at least one three-dimensional data record of local absorption data with the at least one vessel finable with a contrast agent; determining, for each of the two planes, one set of x-rays which pass through the at least one vessel for a multiplicity of temporally subsequent rotational angles of the x-rays emitted in a fan-shape, subsequently referred to as vessel/ray-sets, wherein the set of x-rays from one of the two planes corresponds to a projection taken at a different time than the set of x-rays from the other of the two planes; determining changing absorption values along the at least one vessel from the temporally subsequent vessel/ray-sets; and determining a propagation velocity of the contrast agent in the at least one vessel from the spatial and temporal change of the absorption values in the at least one vessel.