A method of obtaining DC pulse high voltage applied to grid-controlled x-ray tube

Abstract

The invention relates to a method for obtaining a direct-current pulse high voltage applied to a grid-control X-ray bulb tube. The method comprises the following steps that: starting a pulse high-voltage generator, a grid-control power supply outputs a negative high voltage to a grid electrode, a rotating anode of a bulb tube starts to rotate faster, and the negative voltage of the grid-control power supply is eliminated when the rotating anode is accelerated to a regulated rotating speed; meanwhile or after a pulse type high-voltage generator starts a high voltage, the high voltage reaches a cathode filament and an anode target plate of the bulb tube directly, and because the grid voltage becomes zero in a conduction state, the electron generated by the cathode filament passes through the grid and bombards the anode target plate, and an X ray is generated at a focus; when time reaches the set high-voltage one, the pulse type high-voltage generator stops to output the high voltage and the grid-control power supply outputs a negative voltage loaded to the grid electrode, so that the electron beam is cut off immediately. During the process, no harmful soft ray is generated and thus injuries on the human bodies can be reduced, so that an active effect for patients is realized.

Description

technical field [0001] The invention specifically relates to a method for obtaining a DC pulse high voltage applied to a grid-controlled X-ray tube, and belongs to the field of X-ray imaging methods. Background technique [0002] X-ray products are widely used in the market, and the products used in medical treatment include digital radiography machines, gastrointestinal machines, angiography machines, CT, etc. The ability to generate diagnostic X-rays is a common feature of these products. [0003] Obtaining X-rays requires a high-voltage generator and a tube. The high-voltage generator can generate more than ten thousand volts of DC high voltage, which is loaded between the cathode and anode of the X-ray tube. At this time, a large number of electrons generated by the heated filament at the cathode end of the tube are under the action of the electric field. The anode target surface is bombarded at high speed, and the anode target surface will generate X-rays. In practic...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for obtaining a DC pulse high voltage applied to a grid-controlled X-ray tube, which overcomes the problem in the prior art that the capacitor at the load terminal accumulates a large amount of charge when the pulse high voltage stops. Defects that disappear instantly and produce a large number of soft rays that cause harm to the human body

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