CN108811287B - Area array multi-focus grid-control ray source and CT equipment thereof - Google Patents
Area array multi-focus grid-control ray source and CT equipment thereof Download PDFInfo
- Publication number
- CN108811287B CN108811287B CN201810690692.5A CN201810690692A CN108811287B CN 108811287 B CN108811287 B CN 108811287B CN 201810690692 A CN201810690692 A CN 201810690692A CN 108811287 B CN108811287 B CN 108811287B
- Authority
- CN
- China
- Prior art keywords
- grid
- ray
- ray tube
- cathode
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005855 radiation Effects 0.000 claims description 45
- 238000010894 electron beam technology Methods 0.000 claims description 21
- 230000005540 biological transmission Effects 0.000 claims description 14
- 239000002826 coolant Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 4
- 229910018503 SF6 Inorganic materials 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 3
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 3
- 230000002452 interceptive effect Effects 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 20
- 238000010586 diagram Methods 0.000 description 6
- 229910052790 beryllium Inorganic materials 0.000 description 2
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
- H05G1/08—Electrical details
- H05G1/26—Measuring, controlling or protecting
- H05G1/30—Controlling
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
- H05G1/08—Electrical details
- H05G1/56—Switching-on; Switching-off
Abstract
The invention discloses an area array multi-focus grid-control ray source and CT equipment thereof. The grid-control ray source comprises a shell, wherein a filament power supply, a grid-control power supply and a plurality of X-ray tubes are arranged in the shell, the filament power supply is respectively connected with cathodes of the X-ray tubes, and the grid-control power supply is respectively connected with grid-control switches of the X-ray tubes. The grid-control ray source respectively and correspondingly controls the exposure time of a plurality of independent X-ray tubes and the fast switching of paying off through a plurality of grid-control switches, so that each X-ray tube generates X-rays to the same position according to a preset rule, and a plurality of focuses which are arranged according to a preset arrangement shape are formed. The exposure interval of two X-ray tubes in succession of the grid-control ray source is free from other interference X-ray generation, so that the influence of excessive ineffective leakage rays on imaging is avoided, the energy level of the X-rays generated by the grid-control ray source is basically consistent, the influence on imaging is also avoided, and the imaging quality is improved.
Description
Technical Field
The invention relates to a ray source, in particular to an area array multi-focus grid-control ray source (hereinafter referred to as grid-control ray source), and also relates to CT equipment comprising the grid-control ray source, belonging to the technical field of radiation imaging.
Background
In the traditional radiation imaging field, a large portion of the radiation is emitted from a single X-ray source into a large area detector, as shown in fig. 1. Because Compton effect can occur between X-ray and the measured object, scattering phenomenon can occur in the process of projecting X-ray to the detector component, because the detector area is relatively large, a lot of scattered rays can be directly projected to the surface of the detector, thereby reducing contrast and definition of images, and simultaneously reducing signal to noise ratio at fine positions of the images.
As shown in fig. 2, to reduce the effect of scattering phenomena on imaging, a reverse geometry imaging system may be employed that employs an area array of multi-focal spot sources, each focal spot wheel emitting a narrow beam of X-rays toward a small area detector, thereby enabling a set of data to be obtained for volumetric imaging. Because of the smaller detector area, there are few scattered rays projected onto the detector surface.
In general, an area array multi-focal-point radiation source adopts a transmission anode target, which makes an electron beam strike at different positions of the anode target through electromagnetic deflection, a beam limiting structure which is formed by high-density substances and provided with a plurality of small holes is arranged behind the target surface, each small hole position can project an emergent ray, and is regarded as a 'focal point', and rays at the rest positions of the target surface are absorbed by the beam limiting structure. The radiation source has simple structure, low cost, high multi-focus alternating speed and high focus distribution density, but the electron beam deflection of the radiation source is continuous, radiation is always generated between two focuses (time interval and position interval), and the radiation generated in the process is practically not used, but leaks out through small holes on a beam limiting structure to cause interference to imaging. Meanwhile, as shown in fig. 3, the electron beams are made to strike the anode target through electromagnetic deflection, the included angles between a plurality of electron beams and the anode target are not 90 degrees, and the included angles between the electron beams at different positions and the anode target are also different, so that the energy level difference of the rays projected from the small holes at different positions on the beam limiting structure can be caused, and the imaging can be influenced.
Disclosure of Invention
The invention aims to provide an area array multi-focus grid-control ray source.
Another technical problem to be solved by the present invention is to provide a CT apparatus including the grid-controlled radiation source.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
according to a first aspect of an embodiment of the present invention, there is provided an area array multi-focus grid-control radiation source, including a housing, in which a filament power supply, a grid-control power supply, and a plurality of X-ray tubes are disposed, the filament power supply is respectively connected with cathodes of the X-ray tubes, and the grid-control power supply is respectively connected with grid-control switches of the X-ray tubes;
the filament power supply is used for enabling cathodes of the X-ray tubes to generate electrons meeting the preset quantity, the grid control power supply is used for controlling grid control switches of the X-ray tubes, so that electron beams generated on the surfaces of the cathodes of the X-ray tubes bombard corresponding anodes according to preset rules to generate X-rays, and a plurality of focuses are formed, and the focuses are arranged according to preset arrangement shapes.
Preferably, each X-ray tube comprises a vacuum cavity, an anode component, a cathode component and a grid control switch; the anode assembly and the cathode assembly are packaged in the vacuum cavity, the anode assembly is located at one end of the vacuum cavity, the cathode assembly is located at the other end of the vacuum cavity, and the grid-control switch is arranged between the anode assembly and the cathode assembly and is close to the cathode assembly.
Wherein preferably, the surface of the anode component is provided with a transmission anode target, and the transmission anode target is made of a metal material with high atomic number and high melting point.
Wherein preferably, the cathode assembly comprises a focusing cover and a cathode filament, wherein the cathode filament is arranged inside the focusing cover, the cathode filament is connected with a filament power supply, and the filament power supply is connected with an external high-voltage power supply.
Preferably, an opening for passing the electron beam is arranged on the position, opposite to the anode target surface, of the focusing cover.
Wherein preferably no further interfering X-rays are generated in the exposure interval of two consecutive said X-ray tubes of said grid-controlled radiation source.
Wherein preferably the X-ray tube is arranged on one or more tube holders and is fixed at a predetermined position inside the housing by the tube holders.
Preferably, the tube support is provided with a plurality of through holes, and anodes of the X-ray tubes respectively extend from the corresponding through holes and are respectively fixed on the tube support.
Preferably, the shape of the tube support, the positions of the through holes and the distance between the anodes of the X-ray tubes and the tube support are adjusted according to a plurality of focuses which are required to be formed by the grid-controlled ray source and the preset arrangement shape of the focuses.
Preferably, a coolant is filled in the interval of each X-ray tube, so as to realize heat dissipation of the grid-control ray source; the coolant includes, but is not limited to, transformer oil or sulfur hexafluoride gas.
Wherein preferably the X-ray tube includes, but is not limited to, an anode grounded X-ray tube, a cathode grounded X-ray tube, or a neutral grounded X-ray tube.
According to a second aspect of an embodiment of the present invention, there is provided a CT apparatus including the above-described area array multi-focal grid-control radiation source.
The grid-control ray source provided by the invention controls the exposure time and the fast switching of paying off of a plurality of independent X-ray tubes through a plurality of grid-control switches, so that each X-ray tube generates X-rays to the same position (the position where a proposed detector is positioned) according to a preset rule, thereby forming a plurality of focuses which are arranged according to a preset arrangement shape. The exposure interval of two X-ray tubes in succession of the grid-control ray source is free from other interference X-ray generation, so that the influence of excessive missing rays on imaging is avoided, the energy level of the X-rays generated by the grid-control ray source is basically consistent, the influence on imaging is also avoided, and the imaging quality is improved.
Drawings
FIG. 1 is a schematic diagram of an imaging principle of a conventional X-ray source;
FIG. 2 is a schematic diagram of the principle of conventional inverse geometric imaging;
FIG. 3 is a schematic diagram of a conventional area array multi-focal radiation source;
FIG. 4 is a schematic diagram of a grid-controlled radiation source according to the present invention;
FIG. 5 is a schematic view of an X-ray tube in a grid-controlled ray source according to the present invention;
FIG. 6 is a schematic view showing an external structure of an X-ray tube in the grid-controlled ray source according to the present invention;
FIG. 7 is a schematic diagram of a single X-ray tube in a grid-controlled radiation source according to the present invention;
FIG. 8 is a schematic diagram 1 showing the arrangement of X-ray tubes in a grid-controlled ray source according to the present invention;
FIG. 9 is a schematic view of an arrangement of focal spots in a grid-controlled radiation source according to the present invention 1;
FIG. 10 is a schematic view of an arrangement of focal spots in a grid-controlled radiation source according to the present invention;
FIG. 11 is a schematic view of the focal spot arrangement in a grid-controlled radiation source according to the present invention;
fig. 12 is a schematic view of an arrangement of focal spots in a grid-controlled radiation source according to the present invention.
Detailed Description
The technical contents of the present invention will be described in further detail with reference to the accompanying drawings and specific examples.
As shown in fig. 4, the grid-controlled ray source provided by the invention comprises a shell 1, wherein a filament power supply 2, a grid-controlled power supply 3 and a plurality of X-ray tubes 4 are arranged in the shell 1, the filament power supply 2 is respectively connected with the cathode of each X-ray tube 4, and the grid-controlled power supply 3 is respectively connected with a grid-controlled switch of each X-ray tube 4; the filament power supply is used for enabling the cathode surface of each X-ray tube 4 to generate electrons, the grid control power supply 3 is used for controlling the grid control switch of each X-ray tube 4, so that electron beams meeting the preset quantity (electrons meeting the requirement are generated within a certain range) generated by the cathode of each X-ray tube 4 bombard a corresponding anode according to a preset rule to generate X-rays, and a plurality of focuses (focuses of X-ray sources) arranged according to a preset arrangement shape are formed. The focal points arranged according to the preset arrangement shape can be located on the same plane or cambered surface, and can also be located on a plurality of planes or cambered surfaces.
As shown in fig. 5 and 6, each X-ray tube 4 includes a vacuum chamber 401, an anode assembly 402, a cathode assembly 403, and a grid-controlled switch 404; an anode assembly 402 and a cathode assembly 403 are encapsulated inside the vacuum chamber 401, and the anode assembly 402 is positioned at one end of the vacuum chamber 401, and the cathode assembly 403 is positioned at the other end of the vacuum chamber 401, thereby forming an anode and a cathode of the X-ray tube, respectively; the anode and cathode of each X-ray tube 4 are connected to an external high voltage source, respectively, for enabling a voltage difference of several tens and hundreds of kilovolts between the anode and cathode of the X-ray tube 4. A gating switch 404 is disposed between and adjacent to the anode assembly 402 and the cathode assembly 403. Wherein the surface of the anode assembly 402 (not shown) is provided with a transmissive anode target, the anode target surface of which is parallel to the horizontal plane; the transmission anode target can be made of metal materials with high atomic number, high melting point, such as tungsten. One side of the anode target surface of the transmission anode target is used for receiving bombardment of electron beams emitted by the cathode assembly, and the other side of the anode target surface is used for projecting X-rays generated by the anode target surface, so that a focus is formed. The cathode assembly 403 (not shown) includes a focus cap and a cathode filament, the cathode filament is disposed inside the focus cap, the focus cap is made of a metal material, and an opening, which is an electron beam channel for limiting the divergence of the electron beam, is provided at a position where the focus cap faces the anode target surface.
The cathode filament of each X-ray tube is respectively connected with a filament power supply 2, the filament power supply 2 is connected with an external high-voltage power supply, the current of the filament power supply 2 is controlled by the external high-voltage power supply, and the cathode filament is heated to a preset temperature (such as 2000-3000 ℃) under the action of the filament power supply 2, so that electrons (enough active electrons) meeting the preset quantity are generated on the surface of the cathode filament. Wherein the cathode filament may be made of a high melting point tungsten filament. The grid control power supply 3 is also connected with an external high-voltage power supply, and each grid control switch 404 is controlled to be in a conducting state or a disconnecting state through the grid control power supply 3; specifically, as shown in fig. 7, taking a single anode grounding type X-ray tube as an example, when the grid control switch 404 is controlled to be in a conducting state by the grid control power supply 3, and a reverse voltage (for example, the reverse voltage is-130 KV) can be applied to the grid control switch 404 through the grid control power supply 3, the reverse voltage applied by the grid control switch 404 is greater than the voltage of the cathode of the X-ray tube (for example, the voltage of the cathode is-120 KV), so that electrons meeting the preset quantity generated on the surface of a cathode filament are inhibited from flying to a transmission anode target on the surface of an anode component; when the reverse voltage applied by the grid control switch 404 is sufficiently large, all electrons satisfying the preset number generated on the surface of the cathode filament are suppressed from flying to the transmissive anode target on the surface of the anode assembly. When the grid control switch 404 is controlled by the grid control power supply 3 to be in an off state, the applied reverse voltage of the grid control switch 404 disappears, so that a pressure difference is formed between the cathode and the anode of the X-ray tube, at this time, a large amount of electrons generated on the surface of the cathode filament can form electron beams under the action of larger potential energy to fly to the transmission anode target on the surface of the anode assembly, and the electron beams bombard the anode target surface of the transmission anode target directly to generate X-rays and project out of the transmission hole, so that a focus is formed.
Thus, among the multiple focal points generated by the grid-controlled ray source, each focal point corresponds to an independent X-ray tube, and the on-off of the paying-off of each X-ray tube is controlled by the grid-controlled switch of the X-ray tube. The grid-controlled switch of each X-ray tube controls the X-ray tube to expose and pay out one by one, and the electron beam of the cathode of each X-ray tube flying to the transmission anode target is vertical to the anode target surface, thereby ensuring the energy level of the rays generated by each X-ray tube to be consistent.
In the grid-controlled radiation source provided by the invention, as shown in fig. 4, a plurality of X-ray tubes 4 are arranged on one or a plurality of tube supports 5 (not shown in the figure) and are fixed at preset positions inside the shell 1 through the tube supports 5, and one side of the shell 1, which faces the anode of each X-ray tube 4, can be sealed by adopting a light beryllium material (also called as beryllium window) with a small atomic number. Specifically, a plurality of through holes are provided in the tube holder 5, anodes of the plurality of X-ray tubes 4 are respectively protruded from the through holes of the tube holder 5, and the plurality of X-ray tubes 4 are respectively fixed to the tube holder 5 by flanges. Wherein the cathode of each X-ray tube 4 is positioned at one side of the tube support 5 and faces the inner side of the shell 1; the anode of each X-ray tube 4 is located on the other side of the tube holder 5 and faces the outside of the housing 1 (towards the small area detector).
When the X-ray tubes 4 are arranged on one or more tube holders 5, the shape of the tube holders 5, the positions of the through holes in the tube holders 5, and the distance between the anodes of the X-ray tubes 4 and the tube holders 5 may be adjusted according to a plurality of focuses arranged according to a preset arrangement shape, which are required to be formed by the grid-controlled source. For example, as shown in fig. 8 and 9, assuming that the array shape of the plurality of focal points to be formed by the present grid-controlled radiation source is a matrix and is located on the same plane, a rectangular radiation tube holder 5 may be used, and a plurality of through holes are provided on the radiation tube holder 5, and the positions of the plurality of through holes correspond to the positions of the plurality of focal points; the anodes of the X-ray tubes 4 are respectively extended out of the through holes of the X-ray tube support 5, the X-ray tubes 4 are respectively fixed on the X-ray tube support 5 through flanges, and the distances between the anodes of the X-ray tubes 4 and the X-ray tube support 5 are ensured to be the same. The grid-controlled switch 404 of each X-ray tube 4 is controlled to make the electron beam generated on the cathode surface of each X-ray tube 4 bombard the corresponding anode according to a preset rule to generate X-rays, so as to form a plurality of focuses in matrix arrangement.
As shown in fig. 10, assuming that the arrangement shape of the plurality of focuses required to be formed by the grid-controlled radiation source is curved and located on the same plane, an arc-shaped or rectangular radiation tube support 5 may be adopted, and a plurality of through holes are provided on the radiation tube support 5, and the positions of the plurality of through holes correspond to the positions of the plurality of focuses; the anodes of the X-ray tubes 4 are respectively extended out of the through holes of the X-ray tube support 5, the X-ray tubes 4 are respectively fixed on the X-ray tube support 5 through flanges, and the distances between the anodes of the X-ray tubes 4 and the X-ray tube support 5 are ensured to be the same. The grid-controlled switch 404 of each X-ray tube 4 is controlled to make the electron beam generated on the cathode surface of each X-ray tube 4 bombard the corresponding anode according to a preset rule to generate X-rays, so as to form a plurality of focuses in a curved arrangement.
As shown in fig. 11 and 12, assuming that the array shape of the plurality of focuses to be formed by the present grid-controlled radiation source is an array and is located on two planes or arc surfaces, an arc-shaped, rectangular or stepped radiation tube support 5 may be adopted, and a plurality of through holes are provided on the radiation tube support 5, where the positions of the plurality of through holes correspond to the positions of the plurality of focuses; the anodes of the plurality of X-ray tubes 4 are respectively extended out of the through holes of the X-ray tube support 5, the plurality of X-ray tubes 4 are respectively fixed on the X-ray tube support 5 through flanges, the distances between the anodes of the X-ray tubes 4 corresponding to the focuses on the same plane or cambered surface and the X-ray tube support 5 are ensured to be the same, and the distances between the anodes of the X-ray tubes 4 corresponding to the focuses on one plane or cambered surface and the X-ray tube support 5 are larger or smaller than the distances between the anodes of the X-ray tubes 4 corresponding to the focuses on the other plane or cambered surface and the X-ray tube support 5. The grid-controlled switch 404 of each X-ray tube 4 is controlled to make the electron beam generated on the cathode surface of each X-ray tube 4 bombard the corresponding anode according to a preset rule to generate X-rays, so as to form a plurality of focuses arranged in an array. Wherein, can adopt to set up the gasket of different thickness in the positive pole joint position of X-ray tube 4 at the through-hole inboard (the positive pole of X-ray tube 4 stretches into the side) of X-ray tube support 5, realize that there is different distances between the positive pole of X-ray tube 4 to the X-ray tube support 5.
As shown in fig. 11 and 12, assuming that the array shape of the plurality of focuses to be formed by the grid-controlled radiation source is an array and is located on two planes or cambered surfaces, two arc-shaped or rectangular radiation tube supports 5 may be adopted, and a plurality of through holes are arranged on the radiation tube supports 5, and the positions of the plurality of through holes correspond to the positions of the plurality of focuses; the anodes of the X-ray tubes 4 are respectively extended out of the through holes of the X-ray tube support 5, the X-ray tubes 4 are respectively fixed on the X-ray tube support 5 through flanges, the distances between the anodes of the X-ray tubes 4 on the same arc-shaped or rectangular X-ray tube support 5 and the X-ray tube support 5 are ensured to be the same, and the distances between the anodes of the X-ray tubes 4 on one arc-shaped or rectangular X-ray tube support 5 and the X-ray tube support 5 are larger or smaller than the distances between the anodes of the X-ray tubes 4 on the other arc-shaped or rectangular X-ray tube support 5 and the X-ray tube support 5. The grid-controlled switch 404 of each X-ray tube 4 is controlled to make the electron beam generated on the cathode surface of each X-ray tube 4 bombard the corresponding anode according to a preset rule to generate X-rays, so as to form a plurality of focuses arranged in an array.
The preset rule refers to a pay-off scanning control mode of a focus, which can be a progressive pay-off scanning mode, that is, the progressive exposure pay-off of each X-ray tube 4 is performed by controlling the grid control switch 404 of each X-ray tube 4; the line-by-line paying-off scanning can also be performed, namely, the X-ray tubes 4 are exposed and paid off line by controlling the grid control switch 404 of each X-ray tube 4; the line-scanning can be carried out surface by surface, namely, the grid control switch 404 of each X-ray tube 4 is controlled to enable each X-ray tube 4 to be exposed and line-scanned surface by surface; the X-ray tubes 4 can be subjected to cross-row, cross-column or cross-plane paying-off scanning, namely, the X-ray tubes 4 are subjected to cross-row, cross-column or cross-plane exposure paying-off by controlling the grid control switch 404 of each X-ray tube 4; the specific pay-off scanning control mode of the focus can be designed in different control modes according to practical application modes.
In order to achieve a heat dissipation of the present grid-controlled radiation source, a coolant, which may be a flowable high-voltage insulating material, such as transformer oil (high-voltage insulating oil) or sulfur hexafluoride gas (SF 6), may be filled in the region of the spacing of the individual X-ray tubes 4, whereby transformer oil works optimally.
The grid-controlled radiation source can be applied not only to an anode-grounded type X-ray tube but also to a cathode-grounded type X-ray tube or a neutral-grounded type X-ray tube. In the case of a cathode-grounded X-ray tube, the cathode and focus mask are grounded and a positive high voltage is applied to the transmissive anode target. In the case of an X-ray tube with a neutral point grounded, a negative high voltage is applied to the cathode and the focus mask, and a positive high voltage is applied to the transmissive anode target.
The grid-control ray source provided by the invention controls the exposure time and the fast switching of paying off of a plurality of independent X-ray tubes through a plurality of grid-control switches, so that each X-ray tube generates X-rays to the same position (the position where a proposed detector is positioned) according to a preset rule, thereby forming a plurality of focuses which are arranged according to a preset arrangement shape. The exposure interval of two X-ray tubes in succession of the grid-control ray source is free from other interference X-ray generation, so that the influence of excessive missing rays on imaging is avoided, the energy level of the X-rays generated by the grid-control ray source is basically consistent, the influence on imaging is also avoided, and the imaging quality is improved.
The invention also provides a CT device which comprises the grid-control ray source, so that the influence of excessive ineffective leaked rays on imaging is avoided, and the imaging quality of the CT device is improved. Other structures (structures except the grid-control ray source) and working principles of the CT device are existing technologies, and are not described herein.
The planar array multi-focus grid-control ray source and the CT equipment thereof provided by the invention are described in detail above. Any obvious modifications thereof, which would be apparent to those skilled in the art without departing from the true spirit of the present invention, would fall within the scope of the present patent claims.
Claims (11)
1. The area array multi-focus grid-control ray source is characterized by comprising a shell, wherein a filament power supply, a grid-control power supply and a plurality of X-ray tubes are arranged in the shell, the filament power supply is respectively connected with cathodes of the X-ray tubes, and the grid-control power supply is respectively connected with grid-control switches of the X-ray tubes;
the filament power supply is used for enabling the cathode of each X-ray tube to generate electrons meeting the preset quantity, the grid control power supply is used for controlling the grid control switch of each X-ray tube, so that electron beams generated on the cathode surface of the X-ray tube bombard corresponding anodes according to preset rules to generate X-rays, a plurality of focuses are formed, and the focuses are arranged according to preset arrangement shapes,
each X-ray tube comprises a vacuum cavity, an anode component, a cathode component and a grid control switch; the anode component and the cathode component are packaged in the vacuum cavity, the anode component is positioned at one end of the vacuum cavity, the cathode component is positioned at the other end of the vacuum cavity, the grid-controlled switch is arranged between the anode component and the cathode component and is close to the cathode component,
the surface of the anode component is provided with a transmission anode target, one side of an anode target surface of the transmission anode target is used for receiving bombardment of electron beams emitted by the cathode component, the other side of the anode target surface is used for projecting X rays generated by the anode target surface, thereby forming a focus,
the energy levels of the rays generated by the X-ray tubes are consistent.
2. An area array multi-focal grating radiation source as claimed in claim 1, characterized in that: the surface of the anode component is provided with a transmission anode target, and the transmission anode target is made of a metal material with high atomic number and high melting point.
3. An area array multi-focal grating radiation source as claimed in claim 2, characterized in that: the cathode assembly comprises a focusing cover and a cathode filament, wherein the cathode filament is arranged inside the focusing cover, the cathode filament is connected with a filament power supply, and the filament power supply is connected with an external high-voltage power supply.
4. An area array multi-focal grating radiation source as claimed in claim 3, characterized in that: and an opening for passing the electron beam is arranged at the position of the focusing cover, which is opposite to the anode target surface.
5. An area array multi-focal grating radiation source as claimed in claim 1, characterized in that: there is no other interfering X-ray generation in the exposure interval of two consecutive X-ray tubes of said grid-controlled radiation source.
6. An area array multi-focal grating radiation source as claimed in claim 1, characterized in that: the X-ray tube is arranged on one or more tube supports and is fixed at a preset position inside the shell through the tube supports.
7. An area array multi-focal grating radiation source as set forth in claim 6, wherein: the X-ray tube comprises a support, wherein a plurality of through holes are formed in the support, and anodes of the X-ray tubes extend out of the corresponding through holes respectively and are fixed on the support respectively.
8. An area array multi-focal grating radiation source as set forth in claim 7, wherein: and adjusting the shape of the ray tube support, the positions of the through holes and the distance between the anodes of the X-ray tubes and the ray tube support according to a plurality of focuses which are required to be formed by the grid-controlled ray source and the preset arrangement shape of the focuses.
9. An area array multi-focal grating radiation source as claimed in claim 1, characterized in that: the interval of each X-ray tube is filled with a coolant for realizing heat dissipation of the grid-control ray source; the coolant includes, but is not limited to, transformer oil or sulfur hexafluoride gas.
10. An area array multi-focal grating radiation source as claimed in claim 1, characterized in that: the X-ray tube includes, but is not limited to, an anode grounded type X-ray tube, a cathode grounded type X-ray tube, or a neutral grounded type X-ray tube.
11. A CT apparatus comprising an area array multi-focal grid-controlled radiation source according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810690692.5A CN108811287B (en) | 2018-06-28 | 2018-06-28 | Area array multi-focus grid-control ray source and CT equipment thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810690692.5A CN108811287B (en) | 2018-06-28 | 2018-06-28 | Area array multi-focus grid-control ray source and CT equipment thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108811287A CN108811287A (en) | 2018-11-13 |
| CN108811287B true CN108811287B (en) | 2024-03-29 |
Family
ID=64072437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810690692.5A Active CN108811287B (en) | 2018-06-28 | 2018-06-28 | Area array multi-focus grid-control ray source and CT equipment thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108811287B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112188073B (en) * | 2019-07-02 | 2021-08-13 | 苏州博思得电气有限公司 | Hybrid focus control method and device |
| CN112512196A (en) * | 2019-09-16 | 2021-03-16 | 清华大学 | Array type X-ray source and X-ray imaging equipment |
| CN110793981B (en) * | 2019-10-30 | 2022-03-22 | 新鸿电子有限公司 | Time-sharing multiplexing control device and system |
| CN111077173A (en) * | 2020-01-03 | 2020-04-28 | 重庆大学 | Inverted-structure large-view-field Mirco-CT scanning imaging system |
| CN112601339B (en) * | 2020-12-09 | 2024-04-05 | 南京航空航天大学 | Modulated pulsed X-ray emission system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004357724A (en) * | 2003-05-30 | 2004-12-24 | Toshiba Corp | X-ray ct apparatus, x-ray generating apparatus, and data collecting method of x-ray ct apparatus |
| CN104470177A (en) * | 2013-09-18 | 2015-03-25 | 同方威视技术股份有限公司 | X-ray device and CT device with same |
| CN104470171A (en) * | 2013-09-18 | 2015-03-25 | 清华大学 | X-ray device and CT device provided with same |
| CN104470176A (en) * | 2013-09-18 | 2015-03-25 | 同方威视技术股份有限公司 | X-ray device and CT device with same |
| CN108122723A (en) * | 2017-12-25 | 2018-06-05 | 北京纳米维景科技有限公司 | A kind of arc multifocal fixed anode grid-control radiographic source |
| CN208317089U (en) * | 2018-06-28 | 2019-01-01 | 北京纳米维景科技有限公司 | A kind of face battle array multifocal grid-control radiographic source and its CT equipment |
-
2018
- 2018-06-28 CN CN201810690692.5A patent/CN108811287B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004357724A (en) * | 2003-05-30 | 2004-12-24 | Toshiba Corp | X-ray ct apparatus, x-ray generating apparatus, and data collecting method of x-ray ct apparatus |
| CN104470177A (en) * | 2013-09-18 | 2015-03-25 | 同方威视技术股份有限公司 | X-ray device and CT device with same |
| CN104470171A (en) * | 2013-09-18 | 2015-03-25 | 清华大学 | X-ray device and CT device provided with same |
| CN104470176A (en) * | 2013-09-18 | 2015-03-25 | 同方威视技术股份有限公司 | X-ray device and CT device with same |
| CN108122723A (en) * | 2017-12-25 | 2018-06-05 | 北京纳米维景科技有限公司 | A kind of arc multifocal fixed anode grid-control radiographic source |
| CN208317089U (en) * | 2018-06-28 | 2019-01-01 | 北京纳米维景科技有限公司 | A kind of face battle array multifocal grid-control radiographic source and its CT equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108811287A (en) | 2018-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108811287B (en) | Area array multi-focus grid-control ray source and CT equipment thereof | |
| US9991085B2 (en) | Apparatuses and methods for generating distributed x-rays in a scanning manner | |
| US9653251B2 (en) | X-ray apparatus and a CT device having the same | |
| RU2635372C2 (en) | Multi-cathode distributed x-ray apparatus with cathode control and computer-tomographic device with mentioned apparatus | |
| US9653247B2 (en) | X-ray apparatus and a CT device having the same | |
| US2559526A (en) | Anode target for high-voltage highvacuum uniform-field acceleration tube | |
| EP2869327B1 (en) | X-ray tube | |
| US3138729A (en) | Ultra-soft X-ray source | |
| EP0871973B1 (en) | X-ray source | |
| US9111655B2 (en) | Radiation generating apparatus and radiation imaging system | |
| CN208317089U (en) | A kind of face battle array multifocal grid-control radiographic source and its CT equipment | |
| JP5823206B2 (en) | X-ray tube device | |
| US2046808A (en) | X-ray tube | |
| US3579010A (en) | Elongated aperture electron gun structure for flat cathode-ray tube | |
| KR20140043671A (en) | X-ray tube | |
| CN208903967U (en) | A kind of X-ray tube of magnetic scanning formula | |
| CN209071270U (en) | A kind of X-ray tube of electric scanning formula | |
| CN108389768B (en) | Combined scanning X-ray generator | |
| US11569055B2 (en) | Scanning-type x-ray source and imaging system therefor | |
| JP2015076359A (en) | X-ray tube apparatus | |
| US3278780A (en) | Storage display tube with a shield separator between the writing gun and the flood gun | |
| CN109119312A (en) | A kind of X-ray tube of magnetic scanning formula | |
| JP2018170091A (en) | X-ray tube device | |
| JP6026172B2 (en) | X-ray tube device | |
| CN210535623U (en) | X-ray source and X-ray imaging apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |