Patent ID: 8045774

Claim:
A method for creating material-selective volume images, comprising: generating radiation in different energy fields using a radiation source; x-raying an object, composed of various material components, in different energy fields and from different directions of projection; loading a detector with the radiation and capturing projected images in different energy fields by way of the detector device; creating material-selective volume images via an evaluation unit connected downstream of the detector; creating a volume image of the object using a series of projected images captured from different directions of projection; segmenting a volume image of at least one secondary component out of the volume image in addition to a number of main components, which corresponds to at most the number of energy fields; creating mass occupancy partial images linked to the at least one secondary component in the different energy fields by back projection of the volume image of the at least one secondary component in the different energy fields; producing corrected projected images in different energy fields from the captured projected images by removing fractions corresponding to the mass occupancy partial images; creating mass occupancy partial images of the main components using the corrected projected images by inversion of a multi-dimensional attenuation function; and creating material-selective volume images of the main components using the mass occupancy partial images.