Patent Number: 
Section: claims

1. An arrangement for inverse x-ray phase contrast imaging, the arrangement comprising:a photon-counting x-ray detector;a multibeam x-ray tube, focal points of the multibeam x-ray tube being collimated such that a narrow x-ray beam that is directed toward an optical axis of the arrangement and toward the photon-counting x-ray detector is generatable, wherein an active surface of the photon-counting x-ray detector is at least as large as a cross-sectional surface of the narrow x-ray beam;a source grating arranged between the multibeam x-ray tube and the photon-counting x-ray detector, dimensions of the source grating being such that the source grating is irradiatable by all narrow x-rays of the multibeam x-ray tube;a defraction grating arranged between the source grating and the photon-counting x-ray detector, dimensions of the defraction grating being such that the defraction grating is irradiatable by all narrow x-rays that penetrate the source grating; andan absorption grating arranged between the defraction grating and the multibeam x-ray detector, dimensions of the absorption grating being such that the absorption grating is irradiatable by all narrow x-rays that penetrate the defraction grating,wherein an irradiatable surface of the absorption grating is smaller than an irradiatable surface of the defraction grating. 2. The arrangement as claimed in claim 1, wherein the irradiatable surface of the absorption grating is larger than or equal to a photon-receiving active surface of the photon-counting x-ray detector. 3. The arrangement as claimed in claim 2, wherein the irradiatable surface of the defraction grating is smaller than an irradiatable surface of the source grating. 4. The arrangement as claimed in claim 1, wherein the source grating, the defraction grating, and the absorption grating are arranged in parallel to one another and at right angles to the optical axis. 5. The arrangement as claimed in claim 1, wherein a width and a length of the active surface of the photon-counting x-ray detector are greater than 1 cm and less than 10 cm. 6. The arrangement as claimed in claim 1, wherein the focal points are actuatable sequentially. 7. The arrangement as claimed in claim 1,wherein the irradiatable surface of the defraction grating is smaller than an irradiatable surface of the source grating. 8. The arrangement as claimed in claim 2, wherein the source grating, the defraction grating, and the absorption grating are arranged in parallel to one another and at right angles to the optical axis. 9. The arrangement as claimed in claim 3, wherein the source grating, the defraction grating, and the absorption grating are arranged in parallel to one another and at right angles to the optical axis. 10. The arrangement as claimed in claim 2, wherein a width and a length of the active surface of the photon-counting x-ray detector are greater than 1 cm and less than 10 cm. 11. The arrangement as claimed in claim 3, wherein a width and a length of the active surface of the photon-counting x-ray detector are greater than 1 cm and less than 10 cm. 12. The arrangement as claimed in claim 4, wherein a width and a length of the active surface of the photon-counting x-ray detector are greater than 1 cm and less than 10 cm. 13. The arrangement as claimed in claim 2, wherein the focal points are actuatable sequentially. 14. The arrangement as claimed in claim 3, wherein the focal points are actuatable sequentially. 15. The arrangement as claimed in claim 4, wherein the focal points are actuatable sequentially. 16. The arrangement as claimed in claim 5, wherein the focal points are actuatable sequentially. 17. A method for inverse x-ray phase contrast imaging, the method comprising:generating narrow x-rays with a multibeam x-ray tube, focal points of the multibeam x-ray tube being collimated such that the narrow x-rays are directed at an optical axis of the multibeam x-ray tube and at a photon-counting x-ray detector;irradiating a source grating arranged between the multibeam x-ray tube and the photon-counting x-ray detector;irradiating a defraction grating arranged between the source grating and the photon-counting x-ray detector; andirradiating an absorption grating arranged between the defraction grating and the photon-counting x-ray detector,wherein an irradiatable surface of the absorption grating is smaller than an irradiatable surface of the defraction grating. 18. The method as claimed in claim 17, further comprising sequentially actuating the focal points. 19. The method as claimed in claim 17, further comprising using an arrangement, the using of the arrangement comprising the generating, the irradiating of the source grating, the irradiating of the defraction grating, and the irradiating of the absorption grating, the arrangement comprising:the photon-counting x-ray detector;the multibeam x-ray tube, wherein an active surface of the photon-counting x-ray detector is at least as large as a cross-sectional surface of the narrow x-ray beam;the source grating arranged between the multibeam x-ray tube and the photon-counting x-ray detector, dimensions of the source grating being such that the source grating is irradiatable by all narrow x-rays of the multibeam x-ray tube;the defraction grating arranged between the source grating and the photon-counting x-ray detector, dimensions of the defraction grating being such that the defraction grating is irradiatable by all narrow x-rays that penetrate the source grating; andthe absorption grating arranged between the defraction grating and the multibeam x-ray detector, dimensions of the absorption grating being such that the absorption grating is irradiatable by all narrow x-rays that penetrate the defraction grating. 20. The method as claimed in claim 18, further comprising using an arrangement, the using of the arrangement comprising the generating, the irradiating of the source grating, the irradiating of the defraction grating, and the irradiating of the absorption grating, the arrangement comprising:the photon-counting x-ray detector;the multibeam x-ray tube, wherein an active surface of the photon-counting x-ray detector is at least as large as a cross-sectional surface of the narrow x-ray beam;the source grating arranged between the multibeam x-ray tube and the photon-counting x-ray detector, dimensions of the source grating being such that the source grating is irradiatable by all narrow x-rays of the multibeam x-ray tube;the defraction grating arranged between the source grating and the photon-counting x-ray detector, dimensions of the defraction grating being such that the defraction grating is irradiatable by all narrow x-rays that penetrate the source grating; andthe absorption grating arranged between the defraction grating and the multibeam x-ray detector, dimensions of the absorption grating being such that the absorption grating is irradiatable by all narrow x-rays that penetrate the defraction grating.