Small-beam-spot X-ray equipment

Abstract

The invention discloses small-beam-spot X-ray equipment. A conventional filament electronic gun has the defects of large area of a cathode emitting point source and larger size of an electronic source size. A field emitting electronic gun cathode device is arranged in a X-ray sealing sleeve; the field emitting electronic gun cathode device comprises a field emitting filament connected with a flashing power supply; a field emitting power supply is connected between the field emitting filament and a field emitting power supply anode; the field emitting filament is used for emitting electronic beams under a strong electronic field generated by the field emitting power supply; the electronic beams move towards an accelerating power supply anode through an accelerating power supply, and obtain high energy and become high-energy electronic beams after being accelerated; the high-energy electronic beams are irradiated onto a target cooled by using an annular target cooling water device to generate X-rays; and the generated X-rays are emitted out of the X-ray sealing sleeve through a beryllium window. According to the small-beam-spot X-ray equipment, the electronic beams of very small beam spots generated by a field emitting cathode are used for exciting an anode target, and the light spot effects of the X-rays can reach an approximate spot light source effect.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and relates to a small-beam spot X-ray device. Background technique [0002] In medicine and industry, X-ray equipment is used for diagnosis. Such an x-ray system has an x-ray radiator which in turn includes an x-ray tube for generating x-rays. In an evacuated X-ray tube, there is a cathode that emits electrons. These electrons are accelerated towards the anode by high voltage, and finally penetrate into the anode material, thereby generating X-rays. [0003] The cathode emission point source area of ​​the traditional filament electron gun is large, so the size of the electron source is also relatively large (about 50-100 μm), which makes the X-ray beam spot area generated by the cathode X-ray tube larger and the imaging quality is poor. Moreover, due to X-ray photons are scattered. When X-rays with a large beam spot act on the subject, parts of the body that do not need to be inspecte...

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Problems solved by technology

[0003] The cathode emission point source area of ​​the traditional filament electron gun is large, so the size of the electron source is also relatively large (about 50-100 μm), which makes the X-ray beam spot area generated by the cathode X-ray tube larger and the imaging quality is poor. Moreover, due to X-ray photons are scattered. When the X-rays with a large beam spot act on the subject, parts of the body that do not need to be inspected will also receive part of the X-ray irradiation, thereby causing damage to the subject.

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