Patent ID: 7865003

Claim:
An image evaluation method for two-dimensional projection images to show a temporal profile of a distribution of a contrast medium in an examination object, wherein the examination object has a vascular system and a surrounding, wherein each projection image comprises a plurality of pixels with pixel values, wherein the pixel values of pixels corresponding to one another in the projection images are defined by at least essentially locationally identical areas of the examination object, comprising: assigning a uniform two-dimensional image evaluation core for all corresponding pixels to pixels corresponding to one another in the projection images at least in a sub-area of the projection images that is uniform for the projection images; determining at least one characteristic value for the pixel within the projection image based upon the evaluation core assigned to the pixel within the projection image; assigning the characteristic value to the pixel within the projection image; determining parameters of a function in time based upon a temporal profile of characteristic values assigned to corresponding pixels to minimize a deviation between the function of time parameterized with the parameters and the temporal profile of the characteristic values assigned to corresponding pixels; defining a type or an extent based upon the parameters and assigning the type or extent to a pixel of a two-dimensional evaluation image, wherein the type is distinctive of whether the respective pixel of the evaluation image corresponds to a vessel of the vascular system, a perfused part of the surroundings of a vessel of the vascular system or a non-perfused part of the surroundings of a vessel of the vascular system, and wherein the extent is distinctive for an extent of perfusion; and outputting at least the sub-area of the evaluation image to a user via a display device.