Patent Number: 
Section: claims

1. A radiation collimator arranged between a radiation source and an object, comprising:a plurality of absorber channels that are arranged adjacent to one another;a plurality of first absorber elements arranged in the plurality of absorber channels that blocks a radiation emitted by the radiation source in a first position and passes the radiation through the absorber channels in a second position; anda two-dimensional collimator aperture that is formed by the plurality of first absorber elements arranged in the plurality of absorber channels;wherein the plurality of first absorber elements are each configured to be rod-shaped and to be moved in a respective absorber channel from the first position into the second position by a rotation of the respective first absorber element about a rotation axis aligned parallel to a longitudinal axis of the respective absorber channel;and wherein the plurality of first absorber elements are respectively shaped as a cone or a truncated pyramid. 2. The radiation collimator as claimed in claim 1, wherein the radiation reaches the object through the plurality of absorber channels by moving the plurality of first absorber elements in a radiation direction. 3. The radiation collimator as claimed in claim 1, further comprising a plurality of second absorber elements, wherein a respective second absorber element is fixedly arranged in the respective absorber channel downstream or upstream of the respective first absorber element. 4. The radiation collimator as claimed in claim 3, wherein the respective first absorber element and the respective second absorber element are displaceable arranged in respect of one another. 5. The radiation collimator as claimed in claim 3, wherein the respective first absorber element and the respective second absorber element are rotatable arranged in respect of one another. 6. The radiation collimator as claimed in claim 3, wherein the respective absorber channel and the respective first absorber element and the respective second absorber element taper in a direction of the radiation source. 7. The radiation collimator as claimed in claim 1, further comprising a plurality of second absorber elements, wherein a position of the respective first absorber element is changeable with a position of the respective second absorber element. 8. The radiation collimator as claimed in claim 1, wherein the collimator aperture has a partial surface of a surface of a sphere. 9. The radiation collimator as claimed in claim 8, wherein a central point of the collimator aperture is a focal point of the radiation source. 10. The radiation collimator as claimed in claim 1, wherein the radiation collimator is an x-ray collimator and the radiation is an x-ray radiation. 11. The radiation collimator as claimed in claim 1, wherein the radiation collimator is used in a radiation therapy apparatus.