X-ray device and CT device with same

Abstract

The invention provides an external thermionic cathode distributed X-ray device, comprising a vacuum box which is sealed all around and is highly vacuum inside, a plurality of electronic emission units, an anode, and a power and control system. Each electronic emission unit is independent to each other and the electronic emission units are arranged in a linear array and are installed on the side wall of the vacuum box. The anode is installed in the middle part of the vacuum box. On the length direction, the anode is parallel to the arrangement line of the electronic emission units, and on the width direction, an included angle in a preset angle is between the anode and the installation plane of the electronic emission units. The power and control system is provided with a high-voltage power supply, a focusing power supply, an emission control device and a control system. The electronic emission unit is provided with a heating filament, a cathode connected with the heating filament, an insulating support piece which surrounds the cathode and a filament, a focusing electrode which is configured on the top end of the insulating support piece in a manner of being above the cathode, and a connecting fixing piece which is configured above the focusing electrode and is connected with the box wall of the vacuum box in a sealed manner. The filament lead passes through the insulating support piece and is connected with the emission control device.

Description

Technical field [0001] The present invention relates to a device for generating distributed X-rays, in particular to the arrangement of multiple independent hot cathode electron emission units in an X-ray light source device in an external manner and using grid control or cathode control to generate changes in a predetermined order An external hot cathode distributed X-ray device for X-rays at a focal point and a CT device with the device. Background technique [0002] Generally, X-ray light source refers to equipment that generates X-rays, usually composed of X-ray tube, power supply and control system, cooling and shielding and other auxiliary devices, and its core is X-ray tube. X-ray tubes are usually composed of cathode, anode, glass or ceramic housing. The cathode is a direct-heating spiral tungsten wire. When it is working, it is heated to a high temperature state by current passing through it to generate a thermally emitted electron beam. The cathode is surrounded by a m...

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Problems solved by technology

However, there are disadvantages such as complex production process, low emissivity and lifespan of carbon nanotubes

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