Field-emissive cathode X ray tube

A field emission and X-ray tube technology, applied in X-ray tubes, X-ray tube electrodes, X-ray tube components, etc., can solve the problems of low detection and imaging rate, low detection and imaging efficiency, and difficult application solutions , to achieve the effects of improving detection resolution and response speed, improving maneuverability, reducing cost and process difficulty

Inactive Publication Date: 2008-01-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some applications using this method, such as human simulation research, the efficiency will be very low, because the image data that needs to be detected and collected is massive, and the rate of detection and imaging is relatively low with a single X-ray source system
For example, the use of multiple discrete hot cathode ...

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0014] Use spot welding technology to connect the lead wire and the nickel wire of the ceramic rod, and spot weld it on the anode / target; use spot welding technology to connect the lead wire and the nickel wire of the ceramic rod respectively, and the ceramic rod passes through the circular oxygen-free copper in turn Field emission cathode sheet, circular oxygen-free copper modulation grid sheet and circular oxygen-free copper focusing electrode sheet have via holes; at the via holes, the nickel wire in the ceramic rod is respectively connected to the circular oxygen-free copper field by spot welding. The emission cathode sheet, the circular oxygen-free copper modulation grid sheet, and the circular oxygen-free copper focusing electrode sheet are connected; the three electrode sheets are placed opposite and parallel, and the distance between the cathode and the grid is 250 microns; the height of the elliptical oxygen-free copper The voltage anode target is spot-welded on the ot...

Embodiment 2

[0016] Use spot welding technology to connect the lead wire and the nickel wire of the ceramic rod, and spot weld it on the anode / target; use spot welding technology to connect the lead wire and the nickel wire of the ceramic rod respectively, and the ceramic rod passes through the circular oxygen-free copper in turn Field emission cathode sheet, circular oxygen-free copper modulation grid sheet and circular oxygen-free copper focusing electrode sheet have via holes; at the via holes, the nickel wire in the ceramic rod is respectively connected to the circular oxygen-free copper field by spot welding. The emission cathode sheet, the circular oxygen-free copper modulation grid sheet, and the circular oxygen-free copper focusing electrode sheet are connected; the three electrode sheets are placed opposite and parallel, and the distance between the cathode and the grid is 125 microns; the height of the elliptical oxygen-free copper The voltage anode target is spot-welded on the ot...

Embodiment 3

[0018] Use spot welding technology to connect the lead wire and the nickel wire of the ceramic rod, and spot weld it on the anode / target; use spot welding technology to connect the lead wire and the nickel wire of the ceramic rod respectively, and the ceramic rod passes through the circular oxygen-free copper in turn Field emission cathode sheet, circular oxygen-free copper modulation grid sheet and circular oxygen-free copper focusing electrode sheet have via holes; at the via holes, the nickel wire in the ceramic rod is respectively connected to the circular oxygen-free copper field by spot welding. The emission cathode sheet, the circular oxygen-free copper modulation grid sheet, and the circular oxygen-free copper focusing electrode sheet are connected; the three electrode sheets are placed opposite and parallel, and the distance between the cathode and the grid is 200 microns; the height of the elliptical oxygen-free copper The voltage anode target is spot-welded on the ot...

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Abstract

The invention is concerned with the X-ray tube electron source (cathode) structural design of the field emission cathode X-ray tube, which is the type of source with no heating request. It includes: the field emission cathode sheet (-), the modulation grid sheet (-), the highlights electrode films (-), the extremely high-voltage anode target sheet (-), the electrodes connect each sheets, and the carbon Nano-tube electrode emission layer (-) attaches with the field emission cathode sheet; the modulated voltage of the grid controls the on/off of the X-ray line source, and anode to cathode voltage and the grid voltage controls its strength, highlights voltage controls the emission of the electron beam. The invention is with the miniaturization design, smaller X-ray tube with high resolution.

Description

technical field [0001] The invention relates to an X-ray source, in particular to the structural design of an X-ray tube electron source (cathode) and the technical field of device structure design after adopting a field emission cathode. Background technique [0002] X-ray detection imaging is widely used in medical treatment, security inspection, and industrial flaw detection. However, with the development of three-dimensional CT image reconstruction and time-resolution X-ray imaging technology, the limitations of traditional hot cathode X-ray tubes are becoming increasingly apparent, such as The spatial distribution of electrons emitted by hot cathodes is large, and it is difficult to focus, which seriously affects the detection resolution. In addition, the large size is also a fatal defect of traditional hot cathode X-ray tubes, which is difficult to apply to multi-source detection or addressable detection, which limits its Applications in high-resolution 3D X-ray imagin...

Claims

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Application Information

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IPC IPC(8): H01J35/00H01J35/04H01J35/06H01J35/16
Inventor 王琦龙殷晓伟雷威张晓兵娄朝刚
Owner SOUTHEAST UNIV
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