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An X-ray tube with a rotatable anode for generating X-rays and an X-ray apparatus and a method for balancing the rotary anode of an X-ray tube include balancing of the rotary anode applicable to an anode mounted inside an X-ray tube. The rotatable anode includes an anode disc fixedly mounted to a ro

An X-ray tube with a rotatable anode for generating X-rays and an X-ray apparatus and a method for balancing the rotary anode of an X-ray tube include balancing of the rotary anode applicable to an anode mounted inside an X-ray tube. The rotatable anode includes an anode disc fixedly mounted to a rotatably driven support body, which is rotatably supported by a bearing arrangement. The anode includes at least one balancing cavity to adjust the center of gravity of the anode. The balancing cavity is partly filled with a balancing material being solid at operating temperature of the X-ray tube and liquid at a higher temperature. The balancing method includes determining an imbalance of the anode; heating liquefy balancing material; dislocating the balancing material inside the balancing cavity to compensate the imbalance; and cooling to solidify the balancing material.

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1. An X-ray tube having a rotatable anode for generating X-rays, wherein the rotatable anode comprises: a rotatably driven support body;an anode disc fixedly mounted to the rotatably driven support body; anda bearing arrangement, the support body being rotatably supported by the bearing arrangement,

1. An X-ray tube having a rotatable anode for generating X-rays, wherein the rotatable anode comprises: a rotatably driven support body;an anode disc fixedly mounted to the rotatably driven support body; anda bearing arrangement, the support body being rotatably supported by the bearing arrangement,wherein the rotatable anode has at least one balancing cavity to adjust a center of gravity of the rotatable anode, wherein the balancing cavity is partly filled with a balancing material being solid at an operating temperature of the X-ray tube and liquid at a higher temperature higher than the operating temperature. 2. The X-ray tube according to claim 1, wherein the rotatable anode further comprises a balancing element, and wherein the balancing element includes the balancing cavity. 3. The X-ray tube according to claim 1, wherein the at least one balancing cavity is integrally formed with a rotatable part of the rotatable anode. 4. The X-ray tube according to claim 1, wherein for at least two planes at least one balancing cavity is provided for each plane for detecting and adjusting an imbalance. 5. The X-ray tube according to claim 4, wherein at least one balancing cavity is provided for a plurality of planes for detecting an imbalance and adjusting a plurality of centers of gravity. 6. The X-ray tube according to claim 4, wherein the support body comprises a rotor, and wherein at least one balancing cavity is provided for a plane of the rotor and a plane of the anode disc to adjust a rotor related center of gravity and an anode disc related center of gravity. 7. The X-ray tube according to claim 1, wherein the at least one balancing cavity is toroidal. 8. The X-ray tube according to claim 1, wherein the at least one balancing cavity comprises a number of independent sub-volumes. 9. The X-ray tube according to claim 1, wherein the rotatable anode has a marker for phase definition for vibration measurement. 10. The X-ray tube of claim 1, wherein at least one of the X-ray tube and the rotatable anode is moved to determine the center of gravity of the rotatable anode, and to dislocate at least a part of the balancing material inside the at least one balancing cavity when the at least a part of the balancing material is liquid due to heating of the at least a part of the balancing material. 11. An X-ray apparatus with an X-ray tube having a rotatable anode for generating X-rays, wherein the rotatable anode comprises: rotatably driven support body;an anode disc fixedly mounted to the rotatably driven support body; anda bearing arrangement, the support body being rotatably supported by the bearing arrangement,wherein the rotatable anode has at least one balancing cavity to adjust a center of gravity of the rotatable anode, wherein the balancing cavity is partly filled with a balancing material being solid at an operating temperature of the X-ray tube and liquid at a higher temperature higher than the operating temperature. 12. A method for balancing a rotary anode of an X-ray tube, comprising acts of: determining an imbalance of the rotary anode;heating up a balancing material which is arranged inside at least one balancing cavity, which balancing material being solid at an operating temperature of the X-ray tube and liquid at a higher temperature higher than the operating temperature, such that the balancing material becomes liquid;dislocating at least a part of the balancing material inside the balancing cavity such that the imbalance of the rotary anode is at least partially compensated; andcooling the balancing material, such that the balancing material becomes solid. 13. The method according to claim 12, wherein the dislocating act is achieved by angulating the X-ray tube with respect to gravity such that a determined amount of imbalance is accounted for by an amount of material dislocated due to gravity. 14. The method according to claim 12, wherein the rotary anode comprises an anode disc fixedly mounted to a rotatably driven support body, the support body being rotatably supported by a bearing arrangement, and the support body comprises a rotor; wherein the determining act comprises determining a rotor related center of gravity and determining an anode disc related center of gravity; andwherein the acts of heating, dislocating and cooling are consecutively exerted to a balancing material inside a balancing cavity allocated to the rotor and to a balancing material inside a balancing cavity allocated to the anode disc. 15. The X-ray apparatus of claim 11, wherein at least one of the X-ray tube and the rotatable anode is moved to determine the center of gravity of the rotatable anode, and to dislocate at least a part of the balancing material inside the at least one balancing cavity when the at least a part of the balancing material is liquid due to heating of the at least a part of the balancing material. 16. A non-transitory computer readable medium comprising computer instructions which, when executed by a processor, configure the processor to perform acts of: determining an imbalance of the rotary anode;heating up a balancing material arranged inside at least one balancing cavity, the balancing material being solid at an operating temperature of the X-ray tube and liquid at a higher temperature higher than the operating temperature, such that the balancing material becomes liquid;dislocating at least a part of the balancing material inside the balancing cavity such that the imbalance of the rotary anode is at least partially compensated; andcooling the balancing material, such that the balancing material becomes solid.