Patent ID: 7001071

Claim:
An x-ray device comprising: an x-ray tube comprising a cathode that emits an electron beam, and an anode that is struck by said electron beam at a focal spot at a focal position to cause x-rays to be emitted from said focal spot; a deflector that generates a deflection field that interacts with said electron beam in a propagation path between said cathode and said anode to deflect said electron beam to alter said focal spot position; a temperature measuring arrangement to measure a temperature of said anode and to generate a focal spot position signal dependent on measurement of said temperature of said anode; and a closed loop regulator connected to said deflector and to said temperature measuring arrangement for regulating said focal spot position in real time during emission of said electron beam, using said deflection field as a controlled variable, dependent on said focal spot position signal as a control variable wherein said measurement arrangement comprises an infrared camera for measuring temperature.