Patent ID: 7983381

Claim:
X-ray CT system for x-ray phase contrast and/or x-ray dark field imaging of a scanned examination subject, comprising: at least one grating interferometer arranged at a gantry, said at least one grating interferometer comprising: a first grating structure having a plurality of band-shaped x-ray emission maxima and minima arranged in parallel, said maxima and minima exhibiting a first grating period, a second band-shaped grating structure that produces, as a phase grating, a partial phase offset of x-ray radiation passing therethrough and that exhibits a second grating period, a third band-shaped grating structure with a third grating period with which relative phase shifts of adjacent x-rays and/or scatter components are detected, the first, second and third grating structures having respective distances from one another, and at least the respective grating periods of the first and second grating structures satisfying the Talbot conditions, and the third grating structure having a grating period that is larger at least by a factor of 2 to 5 than the grating period of the first grating structure; and a device configured for value-based determination of the phase between adjacent x-rays and/or for value-based determination of the spatial intensity curve per detector element perpendicular to the bands of the grating structures.