Patent ID: 7945018

Claim:
A method for producing tomographic images of an examination object, using an X-ray CT system, the method comprising: scanning the examination object at least one of circularly and spirally with the aid of at least one X-ray tube having a focus; measuring received radiation intensity with the aid of at least one detector, there being arranged, between the at least one X-ray tube and the at least one detector, a set of X-ray optical gratings that are trans-irradiated by the X-radiation and enable a phase contrast measurement, a first grating being arranged between the focus and an examination object, and two gratings being arranged between the examination object and detector; determining, for each ray lying in space between the focus and detector and that penetrates the examination object, at least three intensity measurements with the aid of detector-side gratings respectively arranged offset from one another for the phase shift from this ray upon passage through the object; reconstructing tomographic phase contrast images from the measured phase shifts of the rays; determining the absorption of each ray upon passage through the examination object; reconstructing tomographic absorption images from the absorption measurements; and subsequently superposing and displaying the tomographic absorption images and the tomographic phase contrast images.