Patent Number: 
Section: claims

1. An apparatus for guiding x-rays from a radiation source to a measurement object, comprising at least two reflecting areas forming a slit, the reflecting areas being of planar design, the at least two reflecting areas being opposite one another and providing a slit that tapers towards the measurement object, and  a collimator assigned to the at least two reflecting areas at an end of the at least two reflecting areas pointing towards the measurement object. 2. The apparatus according to  claim 1 , wherein the collimator comprises a slit width that is adjustable. claim 1 3. The apparatus according to  claim 1 , wherein the slit formed by the at least two reflecting areas has an adjustable width. claim 1 4. The apparatus according to  claim 1 , wherein at least one of the at least two reflecting areas is fixed and at least one of the at least two reflecting areas is adjustable in at least one of distance and angle. claim 1 5. The apparatus according to  claim 1 , wherein at least one of the at least two reflecting areas is arranged substantially directly at an exit flange of the x-ray tube. claim 1 6. The apparatus according to  claim 1 , wherein at least one of the at least two reflecting areas comprises a concavely curved design, as seen in cross section. claim 1 7. The apparatus according to  claim 1 , wherein the at least two reflecting areas comprise semiconductor material. claim 1 8. The apparatus according to  claim 7 , wherein the semiconductor material comprises a silicon wafer. claim 7 9. The apparatus according to  claim 1 , wherein at least one of the at least two reflecting areas is at least partly coated with a noble metal. claim 1 10. The apparatus according to  claim 9 , wherein the noble metal is selected from gold, platinum, copper, silver, and palladium. claim 9 11. The apparatus according to  claim 9 , wherein the partly coated reflecting area is provided at an end facing towards the beam exit of the radiation source. claim 9 12. The apparatus according to  claim 9 , wherein the partly coated reflecting area comprises a region without a coating near the measurement object. claim 9 13. The apparatus according to  claim 9 , wherein the partly coated reflecting area comprises a coating that prevents total reflection. claim 9 14. The apparatus according to  claim 1 , wherein at least one of the at least two reflecting areas comprises an uncoated reflecting area near the measurement object. claim 1 15. The apparatus according to  claim 1 , wherein at least one of the at least two reflecting areas comprises an adjusting unit that adjusts the aperture width of the slit. claim 1