Computer-implemented method and evaluation facility for evaluating a set of projection images, computer program, and electronically readable data carrier

An evaluation facility for evaluating a set of projection images of an X-ray facility during maskless angiography in an examination region with a blood vessel structure, the evaluation facility comprising:

• an input interface configured to receive the set of projection images showing a passage of a contrast agent through the blood vessel structure in a covered passage time in a number of projection images of the set of projection images;
• a selection unit configured to select a reference image from the set of projection images;
• a determination unit configured to determine a weight for each projection image in the set of projection images, wherein weights for projection images in the set of projection images that do not correspond to the reference image are determined depending on a similarity of the projection image to the reference image, and wherein a weight for the reference image is determined to be not lower than a maximum of the weights for the other projection images;
• and
• an ascertaining unit configured to ascertain at least one evaluation image from the set of projection images using determined weights for the projection images in the set of projection images.

A non-transitory electronically readable data carrier having a computer program that, when executed on an evaluation facility, causes the evaluation facility to:

• provide a set of projection images showing a passage of a contrast agent through a blood vessel structure in a covered passage time in a number of projection images in the set of projection images;
• select a reference image from the set of projection images;
• determine a weight for each projection image in the set of projection images, wherein weights for projection images in the set of projection images that do not correspond to the reference image are determined depending on a similarity of a respective projection image to the reference image, and wherein a weight for the reference image is determined to be not lower than a maximum of weights for the other projection images;
• and
• ascertain at least one evaluation image from the set of projection images using the determined weights for the projection images in the set of projection images.