X-ray tube and compensation method using negative thermal compensation for anode movement

Abstract

The present invention relates to an X-ray tube with the capability of compensating movement of an anode by using negative heat. The X-ray tube is composed of a rotating anode, a cathode, an X-ray tube housing, a stator coil and the like, wherein the rotating anode comprises an anode rotor, a shaft support, a shaft support heating belt and a rotating bearing; the shaft support and the X-ray tube housing are fixed to each other so as to provide a rotating shaft to the anode rotor, and the anode rotor is connected with the outer side of the shaft support by the rotating bearing. The present invention further relates to a method of compensating the movement of the anode of the X-ray tube by using the negative heat. According to the method disclosed by the present invention, in the condition of focus deviation of the X-ray tube, by changing a current of the shaft support heating belt, the anode rotor moves along the opposite direction, so that the movement of the focus is compensated in a mode that the focus returns to the original position. According to the X-ray tube and the anode movement compensating method disclosed by the present invention, thermal expansion of the anode is inhibited by adopting a negative thermal expansion coefficient, so that drift caused by thermal expansion of the anode is reduced, and furthermore, the problem of focus drift caused by thermal expansion of the anode is effectively solved.

Description

technical field [0001] The invention relates to the technical field of X-ray tubes on CT machines, in particular to an X-ray tube and a compensation method for compensating the movement of the anode by using a material with a negative thermal expansion coefficient on the X-ray tube anode of a CT machine. Background technique [0002] The principle of X-ray imaging is to use X-rays to pass through the human body. Since various tissues and organs of the human body have different degrees of attenuation of X-rays, X-rays pass through the human body to obtain structural information of different tissues and organs inside the human body. Ordinary X-ray films only use X-ray attenuation data at a specific angle to obtain a two-dimensional projection image of the three-dimensional structure of the human body in this direction. The CT machine uses attenuation data from multiple angles at the same time to completely reconstruct the three-dimensional structure of the human body. As the ...

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Problems solved by technology

This difference will have a negative impact on the quality of the final image, blurring the image or producing streaks that are inconsistent with the actual structure

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