Patent Number: 
Section: claims

1. A contour collimator or adaptive filter for adjusting a contour of a ray path of x-ray radiation, the contour collimator comprising:a magnetic fluid that is impermeable to x-ray radiation; andswitchable magnet elements, by which an aperture forming the contour is formable in the magnetic fluid by the magnetic fluid being attracted by magnetic fields of the switchable magnet elements. 2. The contour collimator or adaptive filter as claimed in claim 1, wherein the magnetic fluid is a ferrofluid. 3. The contour collimator or adaptive filter as claimed in claim 1, further comprising a first layer having the magnetic fluid. 4. The contour collimator or adaptive filter as claimed in claim 3, further comprising at least one second layer, in which the switchable magnet elements are arranged. 5. The contour collimator or adaptive filter as claimed in claim 4, further comprising an electrical grid structure formed from conductor paths in the at least one second layer, at points of intersection, of which the switchable magnet elements are arranged. 6. The contour collimator or adaptive filter as claimed in claim 1, wherein the switchable magnet elements include coils, through which current passes. 7. The contour collimator or adaptive filter as claimed in claim 1, further comprising an electric control unit operable to switch the magnet elements on and off in accordance with the contour to be formed. 8. The contour collimator as claimed in claim 4, wherein a plurality of first and second layers are stacked, the plurality of first and second layers comprising the first layer and the at least one second layer. 9. The contour collimator or adaptive filter as claimed in claim 2, further comprising a first layer having the magnetic fluid. 10. The contour collimator or adaptive filter as claimed in claim 9, further comprising at least one second layer, in which the switchable magnet elements are arranged. 11. The contour collimator or adaptive filter as claimed in claim 10, further comprising an electrical grid structure formed from conductor paths in the at least one second layer, at points of intersection, of which the switchable magnet elements are arranged. 12. The contour collimator or adaptive filter as claimed in claim 2, wherein the switchable magnet elements include coils, through which current passes. 13. The contour collimator or adaptive filter as claimed in claim 5, wherein the switchable magnet elements include coils, through which current passes. 14. The contour collimator or adaptive filter as claimed in claim 2, further comprising an electric control unit operable to switch the magnet elements on and off in accordance with the contour to be formed. 15. The contour collimator or adaptive filter as claimed in claim 5, further comprising an electric control unit operable to switch the magnet elements on and off in accordance with the contour to be formed. 16. The contour collimator as claimed in claim 5, wherein a plurality of first and second layers are stacked, the plurality of first and second layers comprising the first layer and the at least one second layer. 17. A method for adjusting a contour in a ray path of an x-ray radiation using a contour collimator or an adaptive filter, the method comprising:attracting a magnetic fluid and drawing the magnetic fluid from an area of an aperture; andforming the aperture as the contour by performing the attracting and drawing of the magnetic fields in a magnetic fluid that is impermeable to x-ray radiation. 18. The method as claimed in claim 17, wherein the magnetic fields are formed by switchable magnet elements. 19. The method as claimed in claim 17, wherein the magnetic fields are formed by electric currents. 20. The method as claimed in claim 18, wherein the magnetic fields are formed by electric currents.