Patent Number: 
Section: claims

1. An x-ray device, comprising:an x-ray radiation source;a coherence grating;a phase grating; andan x-ray detector made of a number of pixels disposed in a matrix-like manner; anda lens grating assembled from prisms, wherein the lens grating is disposed between the phase grating and the x-ray detector and the lens grating includes two sub-gratings arranged in an optical axis direction, of which a first sub-grating deflects x-ray beams which have experienced a phase shift by the phase grating and a second sub-grating deflects x-rays beams which passed the phase grating without being influenced. 2. The x-ray device of claim 1, wherein a focus plane is assigned to the lens grating and wherein the x-ray detector is positioned in the focus plane. 3. The x-ray device of claim 1, further comprising:an absorption grating, positioned between the lens grating and the x-ray detector. 4. The x-ray device of claim 3, wherein a focus plane is assigned to the lens grating and wherein the absorption grating is positioned in the focus plane. 5. The x-ray device of claim 1, wherein the prisms include a triangular or trapezoidal base area. 6. The x-ray device of claim 1, wherein the prisms include a regular arrangement. 7. The x-ray device of claim 6, wherein the regular arrangement of prisms comprises prisms with different base areas. 8. The x-ray device of claim 6, wherein, in each case, a plurality of prisms mesh in such a way that elongate meandering structures are formed in an optical axis direction. 9. The x-ray device of claim 1, wherein the prisms are formed onto a base plate. 10. The x-ray device of claim 9, wherein at least one lateral face of the prisms is inclined with an angle of inclination of between 5° and 15° with respect to the surface normal of the base plate. 11. The x-ray device of claim 1, wherein the prisms are embodied as slanted prisms. 12. The x-ray device of claim 1, wherein the lens grating is assembled from a number of clessidra lenses. 13. The x-ray device of claim 1, wherein gold, nickel or silicon is used as the main material for the lens grating. 14. The x-ray device of claim 1, wherein the x-ray device is for phase-contrast imaging in the medical sector. 15. The x-ray device of claim 1, wherein the lens grating includes an arrangement of positive lenses, each lens configured to focus x-ray radiation to precisely one pixel of the x-ray detector. 16. The x-ray device of claim 1, wherein the lens grating comprises a regular arrangement of columns of positive lenses focusing in one dimension, wherein each one of the columns of positive lenses focuses x-ray radiation in the scope thereof onto precisely one column of pixels of the x-ray detector.