Patent Number: 
Section: claims

1. An anti-scatter device for an X-ray detector, the anti-scatter device comprising:an anti-scatter grid with a plurality of slats for absorbing X-rays; anda cover element arranged on a side of the anti-scatter grid;wherein ends of the slats are coupled to the cover element;wherein the cover element comprises an electroactive polymer material; andwherein a dimension of the cover element is changeable by applying a voltage to the electroactive polymer material, such that a distance between the ends of the slats is changeable by applying the voltage. 2. The anti-scatter device according to claim 1, wherein at least a part of the anti-scatter device is bendable by applying the voltage to the electroactive polymer material of the cover element. 3. The anti-scatter device according to claim 1, wherein the cover element comprises at least one layer of the electroactive polymer material; and/or wherein the cover element comprises at least one electrode for applying the voltage. 4. The anti-scatter device according to claim 1,wherein the anti-scatter device comprises a plurality of layers and a plurality of electrodes; andwherein the plurality of layers and the plurality of electrodes are alternately arranged. 5. The anti-scatter device according to claim 1, wherein the electroactive polymer material comprises at least one monomer selected from the group consisting of Vinylidene-Fluoride and Trifluorovinyl. 6. The anti-scatter device according to claim 1, wherein the cover element is formed as a foil. 7. The anti-scatter device according to claim 1, further comprising:a further cover element;wherein the anti-scatter grid is arranged between the cover element and the further cover element;wherein further ends of the slats are coupled to the further cover element. 8. The anti-scatter device according to claim 7,wherein the further cover element is rigid; and/orwherein the further ends of the slats are fixed at the further cover element. 9. The anti-scatter device according to claim 7,wherein the further cover element comprises electroactive polymer material; andwherein a dimension of the further cover element is changeable by applying a voltage to the electroactive polymer material of the further cover element, such that a distance between the further ends of the slats is changeable by applying the voltage. 10. An X-ray detector comprising:at least one anti-scatter device, wherein the at least one anti-scatter device comprises:an anti-scatter grid with a plurality of slats for absorbing X-rays; anda cover element arranged on a side of the anti-scatter grid;wherein ends of the slats are coupled to the cover element;wherein the cover element comprises an electroactive polymer material; andwherein a dimension of the cover element is changeable by applying a voltage to the electroactive polymer material, such that a distance between the ends of the slats is changeable by applying the voltage. 11. The X-ray detector according to claim 10, further comprising:a flexible substrate foil;an array of pixels arranged on the substrate foil and configured for detecting X-rays; anda scintillator arranged on the array of pixels;wherein the anti-scatter device is arranged on the scintillator;wherein the anti-scatter grid is arranged between the cover element of the anti-scatter device and the scintillator; andwherein at least a part of the X-ray detector is bendable by applying the voltage to the electroactive polymer material of the cover element. 12. The X-ray detector according to claim 11,wherein the substrate foil comprises electroactive polymer material; andwherein the X-ray detector is bendable by applying a voltage to the electroactive polymer material of the substrate foil. 13. The X-ray detector according to claim 11, further comprising:a layer comprising electroactive polymer material. 14. A method for producing an anti-scatter device, the method comprising:providing an anti-scatter grid with a plurality of slats for absorbing X-rays;arranging a cover element on a side of the anti-scatter grid, such that the slats extend transversely from the cover element;coupling ends of the slats to the cover element;wherein the cover element comprises an electroactive polymer material; andwherein a dimension of the cover element is changeable by applying a voltage to the electroactive polymer material, such that a distance between the ends of the slats is changeable by applying the voltage.