CN109830420B - Annular X-ray generator for fixing electron gun - Google Patents
Annular X-ray generator for fixing electron gun Download PDFInfo
- Publication number
- CN109830420B CN109830420B CN201910307910.7A CN201910307910A CN109830420B CN 109830420 B CN109830420 B CN 109830420B CN 201910307910 A CN201910307910 A CN 201910307910A CN 109830420 B CN109830420 B CN 109830420B
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- ring
- annular
- electron gun
- ray
- metal target
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- 239000000498 cooling water Substances 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010894 electron beam technology Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 47
- 239000002184 metal Substances 0.000 abstract description 47
- 238000001816 cooling Methods 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000002826 coolant Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 239000000110 cooling liquid Substances 0.000 description 3
- 239000003574 free electron Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910001080 W alloy Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/49—Pick-up adapted for an input of electromagnetic radiation other than visible light and having an electric output, e.g. for an input of X-rays, for an input of infrared radiation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
Abstract
The invention relates to an annular X-ray generator for fixing an electron gun, which comprises a plurality of electron guns, an anode target ring and a detector ring, wherein the electron guns are circumferentially and fixedly arranged in an annular vacuum cavity, the anode target ring is fixedly arranged, and the detector ring is coaxially arranged side by side with the anode target ring. The ring bodies of the anode target ring and the detector ring are internally provided with annular anode target cooling water channels and detector cooling water channels respectively. The annular fixed metal target does not rotate around the axis at a high speed any more, so that the stress condition of the metal target is greatly improved. The heat that the coolant liquid in the annular cooling tube produced the metal target is taken away and is derived, has solved the overheated and limited problem of heat capacity of metal target to make X-ray generator can be long-time continuously send the ray, make the metal target not fragile. Because the annular metal target does not rotate any more, the metal target is not easy to damage, and the service life of the X-ray generator is greatly prolonged.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to an annular X-ray generator for fixing an electron gun.
Background
In the field of medical imaging, an X-ray generator is a core device of an X-ray imaging device. After the X-ray generator produces X-rays, the rays pass through the object, and the attenuated rays strike a detector, which receives the X-rays and generates image data.
The basic principle of the X-ray generator is that electrons generated by an electron gun are accelerated by an electric field and then hit on a metal target (the metal target is generally a tungsten alloy), and then free electrons of a part of atoms on the metal target are transited to a high energy level, and then the free electrons of the high energy level are transited to a low energy level, and photons are released. This photon is an X-ray photon. In the above structure, the electron gun and the metal target are enclosed in a glass container, and the container is in a vacuum state.
During the above process, about one percent of the total input electrical energy is converted to X-rays, and the remaining about ninety-nine percent of the energy is converted to heat. Therefore, in order to generate X-rays continuously, the metal target has a large heat capacity, or the heat generated on the metal target must be conducted away quickly. Since the accelerated electrons continuously bombard a small area of the metal target, the temperature of the area is very high, and the long-time bombardment can cause the metal to be vaporized, so that the generation of subsequent X-rays is influenced. To solve this problem, the metal target is designed to be disk-shaped and rotated around the axis, so that the electron beam becomes a circular line at the bombardment point of the metal target. However, this has the problem that the heat generated by the rotating metal target is difficult to dissipate (the heat is allowed to be continuously dissipated while the rotation is maintained). Therefore, there is a problem in that the X-ray generator cannot be operated for a long time, and at the same time, in order to ensure a continuous line-laying for a certain period of time, the volume of the metal target is relatively large, thereby ensuring a relatively large thermal capacity. The above problems lead to the X-ray generator being bulky, heavy and incapable of sustained unwinding for a long time. Meanwhile, the shell of the vacuum chamber is made of glass and is easy to break, the metal target rotates at a high speed for a long time when working, and is easy to damage, so that the whole X-ray generator is easy to damage, and the service life is short.
Disclosure of Invention
The applicant aims at the defects in the prior art and provides an annular X-ray generator capable of rapidly leading out heat, continuously paying out and fixing an electron gun, and long in service life.
The technical scheme adopted by the invention is as follows:
the utility model provides a fixed electron gun's annular X ray generator, includes electron gun, positive pole target ring and detector ring, its characterized in that: the anode target ring is fixedly arranged; the electron guns are arranged in a fixed mode in the circumferential direction in the annular vacuum cavity.
It is further characterized in that: the electron guns are uniformly or non-uniformly arranged in the circumferential direction in the annular vacuum cavity.
Further: and annular cooling water channels are arranged in the ring body of the anode target ring and/or the detector ring.
The electron gun is fixedly arranged on the electron gun support frame.
The electron gun strut is located in a vacuum cover ring, and the vacuum cover ring and an anode target ring are matched to form the annular vacuum cavity.
And the inner wall of the vacuum cover ring is provided with a ray window ring, and X rays penetrate through the ray window ring to be emitted.
The emitted X rays form an X ray sector; a plurality of the X-ray sectors cover the detection area of the entire detector ring.
The annular vacuum cavity, the anode target ring and the detector ring are coaxially arranged side by side.
And the electron beam emitted by the electron gun is emitted to the anode target ring along the axial direction of the anode target ring, and is emitted to a detection area of the detector ring opposite to the incident position after the X-ray is excited.
Preferably: the number of the electron guns is 6.
The invention has the following beneficial effects:
(1) the problem of metal target easy damage is solved. The metal target used in the invention is an annular fixed metal target, and the metal target does not rotate around the axis at high speed any more, so that the stress condition of the metal target is greatly improved.
(2) The problem that the metal target of the X-ray generator is not easy to rapidly lead out heat is solved. The annular metal target used by the invention is internally provided with an annular cooling pipeline which is connected with an external radiator, and the cooling liquid in the cooling pipeline takes away the heat generated by the metal target and dissipates the heat to the environment through the external radiator. The heat generated on the metal target is rapidly led out, so that the metal target is not easy to damage.
(3) The problem that the X-ray generator cannot continuously pay off for a long time is solved. The invention uses the annular fixed metal target, the cooling liquid in the metal target can rapidly lead out the heat generated by the metal target, and the problems of overheating and limited heat capacity of the metal target are solved, so that the X-ray generator can continuously emit rays for a long time.
(4) The problem of short service life of the X-ray generator is solved. The annular metal target of the invention does not rotate any more, and the metal target is not easy to damage, so that the service life of the X-ray generator is greatly prolonged.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a half sectional view of the present invention.
Fig. 3 is a front view (full sectional view) of the present invention.
Wherein: 1. an electron gun; 2. an anode target ring; 3. a detector ring; 4. an electronic gun rack; 5. a vacuum cover ring; 6. an X-ray sector; 7. a radiation window ring; 21. an anode target cooling water channel; 31. the detector cools the water course.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, 2 and 3, an annular X-ray generator for fixing an electron gun includes a plurality of electron guns 1 circumferentially fixedly disposed in an annular vacuum chamber, an anode target ring 2 fixedly disposed, and a detector ring 3. The annular vacuum cavity, the anode target ring 2 and the detector ring 3 are coaxially arranged side by side. Annular anode target cooling water channels 21 and annular detector cooling water channels 31 are respectively arranged in the ring bodies of the anode target ring 2 and the detector ring 3.
The electron gun 1 is fixedly arranged on the electron gun support frame 4. The electron gun strut 4 is positioned in the vacuum cover ring 5, and the vacuum cover ring 5 and the anode target ring 2 are matched to form an annular vacuum cavity. The electron beam emitted by the electron gun 1 is emitted to the anode target ring 2 along the axial direction of the anode target ring 2, and is emitted to a detection area of the detector ring 3 opposite to the incident position after the X-ray is excited. The inner wall of the vacuum cover ring 5 is provided with a ray window ring 7, and X-rays are emitted through the ray window ring 7. The emitted X-rays form an X-ray sector 6; the plurality of X-ray sectors 6 covers the detection area of the entire detector ring 3.
Preferably: the number of the electron guns 1 is 6, and the electron guns are uniformly arranged on the electron gun support frame 4.
The metal target used in the invention is an annular metal target, and an annular cooling pipeline is arranged in the annular metal target. The cooling liquid in the cooling pipeline rapidly takes away the heat generated by the metal target. The electron gun is fixed on an electron gun fixing frame, the electron gun fixing frame is fixed on the inner side of the shell of the X-ray generator, and the plurality of electron guns and the fixing frames thereof are arranged along the circumferential direction of the annular metal target. The stress condition of the metal target is greatly improved, so that the metal target is not easy to damage. The X-ray generator shell wraps the annular metal target, the electron gun fixing frame and the electron gun, and an X-ray window is arranged at the outlet of the X-ray and fixed on the shell of the X-ray generator. The X-ray guns emit electrons in time-sharing mode in sequence, so that X-rays are generated on the metal annular target at different positions in time-sharing mode in sequence. Thereby preventing vaporization of the metal by continued bombardment of the same region of the metal target.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (3)
1. The utility model provides a fixed electron gun's annular X ray generator, includes electron gun, positive pole target ring and detector ring, its characterized in that: the anode target ring is fixedly arranged; the electron guns are fixedly arranged in the annular vacuum cavity in the circumferential direction and are uniformly or non-uniformly arranged in the circumferential direction in the annular vacuum cavity; annular anode target cooling water channels and detector cooling water channels are respectively arranged in the ring bodies of the anode target ring and the detector ring; the electron gun is fixedly arranged on an electron gun support frame, the electron gun support frame is positioned in a vacuum cover ring, and the vacuum cover ring and an anode target ring are matched to form the annular vacuum cavity; the annular vacuum cavity, the anode target ring and the detector ring are coaxially arranged side by side, an electron beam emitted by the electron gun is emitted to the anode target ring along the axial direction of the anode target ring, and the electron beam is emitted to a detection area of the detector ring opposite to the incident position after exciting an X ray.
2. The annular X-ray generator for a stationary electron gun according to claim 1, wherein: the inner wall of the vacuum cover ring is provided with a ray window ring, X rays penetrate through the ray window ring to be emitted, and the emitted X rays form an X ray sector; a plurality of the X-ray sectors cover the detection area of the entire detector ring.
3. The annular X-ray generator for a stationary electron gun according to claim 1, wherein: the number of the electron guns is 6.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018103546364 | 2018-04-19 | ||
| CN201810354636.4A CN108417471A (en) | 2018-04-19 | 2018-04-19 | A kind of annular X-ray emitter of fixed electron gun |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109830420A CN109830420A (en) | 2019-05-31 |
| CN109830420B true CN109830420B (en) | 2021-07-30 |
Family
ID=63135908
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810354636.4A Pending CN108417471A (en) | 2018-04-19 | 2018-04-19 | A kind of annular X-ray emitter of fixed electron gun |
| CN201910307910.7A Active CN109830420B (en) | 2018-04-19 | 2019-04-17 | Annular X-ray generator for fixing electron gun |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810354636.4A Pending CN108417471A (en) | 2018-04-19 | 2018-04-19 | A kind of annular X-ray emitter of fixed electron gun |
Country Status (1)
| Country | Link |
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| CN (2) | CN108417471A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122952A (en) * | 1994-09-28 | 1996-05-22 | 西门子公司 | X-ray tube with ring vaccum case |
| CN1550215A (en) * | 2003-05-19 | 2004-12-01 | Ge医疗系统环球技术有限公司 | Stationary computerized tomography system with small-sized X-ray source assembly |
| CN103385732A (en) * | 2013-07-25 | 2013-11-13 | 中国科学院苏州生物医学工程技术研究所 | Static CT (Computed Tomography) scanner |
| CN104362063A (en) * | 2014-12-05 | 2015-02-18 | 中国科学院深圳先进技术研究院 | Integrally-packaged carbon nano-radiation source for computed tomography (CT) imaging system |
| CN106941062A (en) * | 2017-04-20 | 2017-07-11 | 上海宏精医疗器械有限公司 | A kind of negative electrode tilting X-ray apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7483518B2 (en) * | 2006-09-12 | 2009-01-27 | Siemens Medical Solutions Usa, Inc. | Apparatus and method for rapidly switching the energy spectrum of diagnostic X-ray beams |
-
2018
- 2018-04-19 CN CN201810354636.4A patent/CN108417471A/en active Pending
-
2019
- 2019-04-17 CN CN201910307910.7A patent/CN109830420B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122952A (en) * | 1994-09-28 | 1996-05-22 | 西门子公司 | X-ray tube with ring vaccum case |
| CN1550215A (en) * | 2003-05-19 | 2004-12-01 | Ge医疗系统环球技术有限公司 | Stationary computerized tomography system with small-sized X-ray source assembly |
| CN103385732A (en) * | 2013-07-25 | 2013-11-13 | 中国科学院苏州生物医学工程技术研究所 | Static CT (Computed Tomography) scanner |
| CN104362063A (en) * | 2014-12-05 | 2015-02-18 | 中国科学院深圳先进技术研究院 | Integrally-packaged carbon nano-radiation source for computed tomography (CT) imaging system |
| CN106941062A (en) * | 2017-04-20 | 2017-07-11 | 上海宏精医疗器械有限公司 | A kind of negative electrode tilting X-ray apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108417471A (en) | 2018-08-17 |
| CN109830420A (en) | 2019-05-31 |
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