Carbon nanotube based x-ray tube and mobile ct scanner

Abstract

A carbon nanotube-based X-ray tube and a movable CT scanner. The carbon nanotube-based X-ray tube comprises an anode (1) and a carbon nanotube cathode (2). Electrons generated by field emission of the carbon nanotube cathode (2) under the effect of an external electric field bombard the anode (1) to generate X-rays. High-frequency pulse transmission can be implemented very easily by using a carbon nanotube to develop an X-ray tube, the response speed is fast, and the service life is long, and accordingly, an inherent defect of the existing wolfram (W) thermal filament X-ray source is overcome, and practical application demands such as a medical detection can be better met.

Description

technical field [0001] The invention relates to a cold cathode X-ray tube, in particular to an X-ray tube based on carbon nanotubes and a mobile CT scanner. Background technique [0002] The current medical X-ray sources mainly use tungsten (W) hot filament X-ray tubes. The basic principle is: electrify the filament to heat, when the temperature of the filament reaches thousands of degrees Celsius, thermionic electrons are emitted, and the thermal electrons converge under the action of the electric field force and accelerate to hit the anode, thereby generating X-rays. The mode in which thermal emission generates electrons leads to slow start-up and short lifetime of such X-ray sources. The cumulative exposure time of the X-ray tube with rotating anode is generally only tens of hours, and the cumulative exposure time of the X-ray tube with fixed anode is about 2000 hours. [0003] When continuous pulse scanning is required, the traditional X-ray source cannot turn off the ...

AI Technical Summary

Problems solved by technology

If the number of projection angles for one rotation is reduced, the unit sampling time must be extended, and the projections of adjacent voxels on the concentric circle of the imaging object will overlap, resulting in motion artifacts

Although today's high-end CT scanners use flying focus technology to overcome motion artifacts, this leads to a very complex and costly X-ray tube structure and control

Images