| 摘要 |
FIELD: physics.SUBSTANCE: invention relates to rotating-anode X-ray tubes for generating a fan beam of X-rays. A system for measuring and compensating a recurrent deviation (?z) of the actual position from the desired position of an electron beam focal spot (FS), said electron beam (EB) being emitted by an electron emitter of the X-ray tube cathode (C) on a target area (AT) of an X-ray tube rotary anode disk (RA), wherein said system comprises a position sensor (WS) adapted for detecting the recurrent deviation during at least one period thereof, a beam deflection unit (BD) with an integrated controller adapted for deflecting said electron beam (EB) based on the measurement results obtained from the position sensor (WS), such that the path of the electron beam focal spot describes a certain trajectory. The system is adapted for measuring and compensating a periodical wobbling of the inclination angle of an X-ray tube rotary anode disk (RA) relative to an ideal rotational plane which is oriented normal to a rotating shaft (S) on which the rotary anode disk (RA) is mounted with an inclination due to an error during the manufacturing process. The position sensor (WS) is adapted for detecting deviations of said inclination angle over the time.EFFECT: improved image quality.13 cl, 8 dwg |
