Field-emissive cathode X ray tube

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...

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 X-ray sources in a 3D CT system can solve the problem of low detection and imaging efficiency to a certain extent, but the ensuing increase in power consumption makes the heat dissipation of the system particularly prominent. Moreover, the excessively large device size also makes this application solution difficult and difficult to promote

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