Patent ID: 7860288

Claim:
A method for evaluating a group of projection images of an object under examination, comprising: defining combination images having a plurality of pixels with pixel values based on the projection images in the group, a sequence of the combination images indicating a time characteristic of the pixel values showing a distribution of a contrast medium over time in the object; determining an evaluation image having a plurality of pixels with pixel values based on the combination images, the pixels of the evaluation image corresponding to the pixels of the combination images; assigning a type to each pixel in an area of the evaluation image corresponding to a type selected from the group consisting of: a vessel of the object, a perfusion area of the object, and a background of the object; and performing the type assignment based on the time characteristic of the pixel values of the combination images for identifying a vascular system of the object, wherein the object is an iteratively moving object, wherein the combination images are selected from a series of projection images of the iteratively moving object each having an assigned phase information that deviates by a maximum of one phase boundary from a reference phase, wherein the reference phase or the phase boundary is specified by a user, and wherein a number of the selected combination images is determined and outputted to the user.