Multi-focal fixed anode X-ray tube based on field emission cathode

A field emission cathode and X-ray tube technology, applied in the field of X-ray tubes, can solve the problems of not being able to meet the imaging requirements and limit the number of X-ray tubes, and achieve the effect of easy engineering implementation, increasing the number of projection angles, and reducing the number of requirements

Inactive Publication Date: 2012-07-04
SUZHOU INST OF BIOMEDICAL ENG & TECH
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  • Description
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  • Application Information

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Problems solved by technology

In this way, when the diameter of the circular X-ray source has been determined (such as 100cm), the number of X-ray tubes that can be used is limited (calculated according to the above parameters, about 60 can be placed), which may not meet the imaging requirements

Method used

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  • Multi-focal fixed anode X-ray tube based on field emission cathode
  • Multi-focal fixed anode X-ray tube based on field emission cathode
  • Multi-focal fixed anode X-ray tube based on field emission cathode

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Embodiment Construction

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0025] see Figure 4 As shown, a multi-focus fixed anode X-ray tube based on a field emission cathode includes a field emission cathode 1 based on a nanotube material, a grid 2 for controlling the operation of the X-ray tube, a focusing electrode 3 for controlling the focus of the electron beam, and an electron acceptor. The anode 4 that bombards to generate X photons also includes a pair of deflection electrodes 5 for applying a voltage to form a deflection electric field, and the pair of deflection electrodes 5 are arranged between the field emission cathode 1 and the anode 4 .

[0026] Further, the grid 2 works in pulse mode.

[0027] see Figure 5 As shown, the specific working mode of the multi-focus fixed anode X-ray tube based on the field emission cathode of the present embodiment is as follows:

[0028] In order to achiev...

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Abstract

The invention discloses a multi-focal fixed anode X-ray tube based on a field emission cathode. The multi-focal fixed anode X-ray tube comprises the field emission cathode based on a nano-tube material, a gate for controlling the X-ray tube to work, a focusing electrode for controlling an electron beam to focus and an anode for receiving X photons generated by electron bombardment, as well as a pair of deflection electrodes for loading voltage to form a deflecting electric field, wherein the pair of the deflection electrodes is arranged between the field emission cathode and the anode, and the gate works in a pulse way. The multi-focal fixed anode X-ray tube based on the field emission cathode, disclosed by the invention, can possess more than one focal point, so that the number of projection angles, which can be provided by the single X-ray tube, can be significantly increased, the demand of a static CT (computerized tomography) scanner on the number of the X-ray tubes of the field emission cathode can be further reduced, and the static CT scanner is easier for engineering implementation.

Description

[0001] technical field [0002] The invention relates to an X-ray tube, in particular to an X-ray tube based on a field emission cathode. [0003] Background technique [0004] Under a strong electric field, electrons can pass through the surface barrier of the material through the tunnel effect and discharge phenomenon occurs. With the development of nanotechnology, people use nanotubes to develop a field emission electron source, and then use this electron source to develop an X-ray source. The basic technical principle of the X-ray source is as follows: nanotubes generate field emission under the action of an external strong electric field, and then electrons bombard the anode under the acceleration of the electric field to generate X-rays. The X-ray source after using nanotubes has many advantages: no need to heat the filament, it can be turned on at any time, fast time response, high pulse frequency, and longer life than the heated filament. [0005] In order to achi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J35/04H01J35/14
Inventor 代秋声徐品邢晓曼刘猛
Owner SUZHOU INST OF BIOMEDICAL ENG & TECH
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