CN108389768B - Combined scanning X-ray generator - Google Patents
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- CN108389768B CN108389768B CN201810441775.0A CN201810441775A CN108389768B CN 108389768 B CN108389768 B CN 108389768B CN 201810441775 A CN201810441775 A CN 201810441775A CN 108389768 B CN108389768 B CN 108389768B
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- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/14—Arrangements for concentrating, focusing, or directing the cathode ray
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/06—Cathodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/08—Anodes; Anti cathodes
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Abstract
Embodiments of the present disclosure disclose a combination scanning X-ray generator. The combination scanning X-ray generator comprises: a housing; an anode disposed within the housing, the anode including opposing anode first and second ends; a pencil beam radiation source disposed at the first end of the anode and configured to emit a pencil beam of X-rays; a fan beam radiation source disposed at a second end of the anode and configured to emit a fan-shaped X-ray beam, wherein the first end and the second end are opposite ends of the anode; wherein the pencil beam radiation source and the fan beam radiation source are independently operable.
Description
Technical Field
Embodiments of the present disclosure relate to the field of radiation generation technology, and in particular, to a combination scanning X-ray generator.
Background
X-ray transmission and back-scattering imaging techniques have been widely used in the field of security inspection, respectively. The transmission imaging technology has good penetrability and high spatial resolution, and is sensitive to the reaction of high atomic number substances such as copper, iron and the like according to the different attenuation degrees of the X-rays after passing through different substances, the imaging is clear, and the identification effect is better. The back scattering imaging technology has low radiation dose, good safety, limited penetrating capacity, more sensitivity to low atomic number substances and good detection effect on drugs, gasoline, explosives and the like; in addition, the backscatter imaging technique employs spot beam scanning, and therefore requires modulating a fan beam or cone beam generated by a conventional X-ray generator into a pencil beam.
When the two techniques of X-ray transmission and back scattering are used alone, a missing detection phenomenon is inevitably caused due to the inherent defects thereof. Along with the increasing severity of safety situation, the requirements on security inspection equipment are higher and higher, so that the requirements of the fusion use of X-ray transmission and back scattering technology are met; thus, the detection range can be enlarged, and the detection performance can be improved.
Disclosure of Invention
According to an aspect of the present disclosure, embodiments of the present disclosure provide a combination scanning X-ray generator comprising: a housing; an anode disposed within the housing, the anode including opposing anode first and second ends; a pencil beam radiation source disposed at the anode first end and configured to emit a pencil beam of X-rays, wherein the pencil beam radiation source includes a first cathode configured to emit electrons within the pencil beam radiation source toward the anode first end; a fan beam radiation source disposed at the anode second end and configured to emit a fan beam of X-rays, wherein the fan beam radiation source comprises a second cathode configured to emit electrons within the fan beam radiation source toward the anode second end; wherein the pencil beam radiation source and the fan beam radiation source are independently operable.
A first cathode configured to emit electrons toward a first end of an anode of the pencil beam radiation source and a second cathode configured to emit electrons toward a second end of the anode of the fan beam radiation source; the first high voltage power supply and the second high voltage power supply are applied between the first cathode and the first end of the anode, and the second high voltage power supply is applied between the second cathode and the second end of the anode, or the first high voltage power supply and the second high voltage power supply can be the same high voltage power supply.
In one embodiment, the anode is arranged such that the anode first end and the anode second end are rotatable relative to each other.
In one embodiment, the pencil beam radiation source includes a first target disposed at a first end face of the anode, the first target emitting X-rays upon electron bombardment; the fan-shaped beam radiation source comprises a second target which is arranged on the end face of the second end of the anode, and the second target emits X rays after being bombarded by electrons;
the first end face is not perpendicular to the length extending direction of the anode, and the second end face is not perpendicular to the length extending direction of the anode.
In one embodiment, the combination scanning X-ray generator is configured such that the first target of the pencil beam radiation source and the second target of the fan beam radiation source are capable of emitting X-rays synchronously or asynchronously.
In one embodiment, the combination scanning X-ray generator is configured such that the voltage applied between the first cathode and the first end of the anode is equal to the voltage applied between the second cathode and the second end of the anode, such that the X-ray energy produced is the same.
In one embodiment, the combination scanning X-ray generator is configured such that the voltage applied between the first cathode and the first end of the anode is not equal to the voltage applied between the second cathode and the second end of the anode, such that the X-ray energy produced is not the same.
In one embodiment, the pencil beam radiation source includes a guard drum configured to modulate X-rays emitted by the first target into a pencil X-ray beam; and wherein the fan beam radiation source comprises a collimator configured to modulate X-rays emitted by the second target into a fan X-ray beam.
In one embodiment, the shield drum surrounds the anode first end, allows electrons to strike the first target through the shield drum, and limits X-rays emitted by the first target such that X-rays emitted by the first target can only exit the shield drum exit orifice, forming a pencil X-ray beam.
In one embodiment, the pencil beam radiation source further comprises an armature core disposed on the anode adjacent the first end of the anode and an armature winding surrounding the armature core, and a plurality of permanent magnets disposed on an inner wall of the shield bowl corresponding to the armature core such that the armature winding interacts with the plurality of permanent magnets to drive rotation of the shield bowl about the first end of the anode when the armature winding forms a varying magnetic field.
In one embodiment, a collimator surrounds the anode second end, allows electrons to strike the second target through the collimator, and limits X-rays emitted by the second target such that X-rays emitted by the second target can only exit the collimator outlet, forming a fan-shaped X-ray beam.
In one embodiment, the pencil X-ray beam emitted from the shield drum exit orifice and the fan X-ray beam emitted from the collimator exit orifice are each located in two parallel planes.
In one embodiment, the scanning coverage of the pencil shaped X-ray beam emitted from the exit aperture of the protective drum and the coverage of the fan shaped X-ray beam emitted from the collimator exit do not overlap, partially overlap or fully overlap, as seen along the length of the anode.
In one embodiment, the opening angle of the scan range of the pencil-shaped X-ray beam emitted from the shield drum exit orifice is the same as the opening angle of the fan-shaped X-ray beam emitted from the collimator exit orifice.
In one embodiment, the angle of opening of the scan range of the pencil shaped X-ray beam emitted from the shield drum exit orifice is different from the angle of opening of the fan shaped X-ray beam emitted from the collimator exit orifice.
In one embodiment, the anode includes an anode stem coupled to the housing for securing the anode within the housing.
In one embodiment, the anode stem includes a cooling channel configured to flow a cooling medium.
Drawings
FIG. 1 illustrates a schematic cross-sectional view of a combination scanning X-ray generator of one embodiment of the present disclosure;
FIG. 2 illustrates a schematic view of a sealing joint of one embodiment of the present disclosure;
FIG. 3 illustrates a schematic cross-sectional view of a shield drum of an anode first end of a combination scanning X-ray generator in accordance with an embodiment of the present disclosure;
FIG. 4 shows a schematic cross-sectional view of a collimator of an anode second end of a combination scanning X-ray generator of an embodiment of the disclosure;
FIG. 5 shows a schematic view of an X-ray beam at both ends of a combination scanning X-ray generator in accordance with an embodiment of the present disclosure;
FIG. 6 shows a schematic diagram of an X-ray beam at both ends of a combination scanning X-ray generator in accordance with an embodiment of the present disclosure;
fig. 7 shows a schematic diagram of the positional relationship of the X-ray beams at both ends of the combined scanning X-ray generator of the embodiment of the present disclosure, wherein fig. 7a is a schematic diagram showing the X-ray beams at both ends, and fig. 7b shows the positional relationship of the opening angle of the pencil-shaped X-ray beam scanning range and the opening angle of the fan-shaped X-ray beam.
Detailed Description
While the disclosure is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the drawings and detailed description thereto are not intended to limit the disclosure to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims. The figures are for illustration purposes and are not drawn to scale.
In this specification, the terms "upper", "lower", and the like are used not to define an absolute orientation of the elements, but to describe their relative positions in the drawings to aid understanding. In this specification "top side" and "bottom side" are orientations of the upper side and lower side relative to an object that is generally upright.
Various embodiments according to the present disclosure are described below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 illustrates a combination scanning X-ray generator of one embodiment of the present disclosure, comprising: a housing; an anode disposed within the housing, the anode including opposing anode first and second ends; a pencil beam radiation source disposed at the anode first end and configured to emit a pencil beam of X-rays, wherein the pencil beam radiation source includes a first cathode configured to emit electrons within the pencil beam radiation source toward the anode first end; a fan beam radiation source disposed at the anode second end and configured to emit a fan beam of X-rays, wherein the fan beam radiation source includes a second cathode configured to emit electrons within the fan beam radiation source toward the anode second end. In this embodiment, the combined scanning X-ray generator can emit two beams of X-rays, so that a single X-ray tube can perform simultaneous irradiation of two objects, which is particularly advantageous for some occasions with limited places because two sets of X-ray generating devices are needed to save space compared with the prior art. Further, the combined scanning X-ray generator of the embodiment can simultaneously provide a pen-shaped X-ray beam and a fan-shaped X-ray beam, so that the combined scanning X-ray generator is wider in application and improved in adaptability. In this embodiment, the pencil beam radiation source and the fan beam radiation source may be considered to share one anode.
Further, the pencil beam radiation source 1 and the fan beam radiation source 2 may be operated independently. For example, the pencil beam radiation source 1 and the fan beam radiation source 2 can be operated simultaneously, can also be operated according to a certain time sequence, can also respectively emit X-ray beams with the same energy, and can also emit X-ray beams with different energies, and the configuration can enable the use of the combined scanning X-ray generator to be more flexible, adapt to different requirements, and really realize the functions of two X-ray generating devices through one combined scanning X-ray generator.
The components of the combined scanning X-ray generator of the invention are enclosed in a housing 6, or the pencil beam radiation source 1 and the fan beam radiation source 2 are enclosed in two housing parts respectively, which are respectively and hermetically connected with the two end parts of the anode handle 5.
In one embodiment of the present disclosure, the first cathode 10 may be considered as part of the pencil beam radiation source 1 and the second cathode 30 may be considered as part of the fan beam radiation source 2. The first cathode 10 includes a first filament 11, a first focus cap 12, and a first filament lead 13; the second cathode 30 includes a second filament 31, a second focus cap 32, and a second filament lead 33. The first filament lead 13 and the second filament lead 33 are used for externally connecting with the negative electrode of a filament power supply and a high-voltage power supply. In one embodiment, the first filament 11 is connected to a negative pole of a high voltage power supply and to a filament power supply for emitting electrons; the second filament 31 is connected to the negative pole of the same high voltage power supply and to the filament power supply for emitting electrons. In another embodiment, the first filament 11 is connected to the negative pole of a high voltage power supply and the filament power supply for emitting electrons; the second filament 31 is connected to the cathode of another high voltage power supply and to the filament power supply for emitting electrons, so that the voltages and currents of the first filament 11 and the second filament 31 can be controlled individually, thereby realizing the independent operation of the pencil-beam radiation source 1 and the fan-beam radiation source 2 as described above. The first focusing cap 12 and the second focusing cap 32 can focus electrons and also serve as support cathodes. The first focus housing 12 provides an opening for the exit of electrons, the other part being sealed, the electrons not being scattered into the environment, and the second focus housing 32 being similar. In one embodiment, the centers of the first filament 11, the second filament 31, the first target 23, and the second target 43 are on the same horizontal line. As shown in fig. 1, one end of the housing 6 is welded to the first focus cage 12, and the other end of the housing 6 is welded to the second focus cage 32. The housing 6 may be made of hard glass, corrugated ceramic, cermet, or the like. In one embodiment, the portion of the housing 6 that is intended to be transparent to X-rays may be windowed with beryllium in order to reduce the loss of the X-ray beam and to improve its output efficiency and dose performance.
According to an embodiment of the present disclosure, the pencil beam radiation source 1 and the fan beam radiation source 2 may be operated independently, whereby the energy of the two X-ray beams emitted by the combined scanning X-ray generator may be controlled individually.
For example, in one embodiment, the voltage applied between the first cathode 10 and the anode first end 20 is equal to the voltage applied between the second cathode 30 and the anode second end 40, such that the X-ray energy produced by the pencil beam radiation source 1 and the fan beam radiation source 2, respectively, is the same.
In another embodiment, the combination scanning X-ray generator is configured such that the voltage applied between the first cathode 10 and the anode first end 20 is not equal to the voltage applied between the first cathode 10 and the anode first end 20, such that the X-ray energy generated by the pencil beam radiation source 1 and the fan beam radiation source 2, respectively, is not the same.
For example, in the case of detecting two different objects, one object performs back scattering detection and the other object performs transmission detection, the combined scanning X-ray generator of this embodiment can emit two pencil-shaped X-ray beams and fan-shaped X-ray beams with different energies at the same time to complete detection, which improves the detection efficiency, enhances the adaptability of the combined scanning X-ray generator, and greatly improves the application range of the device.
In this embodiment, the pencil beam radiation source 1 comprises a first target 23 arranged at the end face of the first end 20 of the anode, and the first target 23 emits X-rays after being bombarded by electrons; the fan beam radiation source 2 comprises a second target 43 arranged at the end face of the anode second end 40, the second target 43 emitting X-rays after being bombarded with electrons. In this embodiment, the first end face is not perpendicular to the length extension direction of the anode, and the second end face is not perpendicular to the length extension direction of the anode. In this embodiment, the pencil beam radiation source 1 and the fan beam radiation source 2 may be operated independently, such that the first target 23 and the second target 43 may emit X-rays synchronously or asynchronously.
In one embodiment, pencil beam radiation source 1 includes a guard drum 211 configured to modulate X-rays emitted by first target 23 into a pencil X-ray beam. The fan beam radiation source 2 comprises a collimator 41 configured to modulate X-rays emitted by the second target 43 into a fan-shaped X-ray beam.
When electrons of the first cathode 10 bombard the first target 23, the first target 23 will generate X-rays, and the collimator disposed in front of the first target 23 can limit the X-rays emitted from the first target 23 to a certain range. For clarity, fig. 1 does not show a collimator arranged in front of the first target 23 to limit the X-ray exit range. However, it should be appreciated that the X-rays emitted from the first target 23 may be fan-shaped X-rays. The opening angle of the collimator determines the opening angle of the surface beam of the outgoing fan-shaped X-rays. The shield drum 211 surrounds the anode first end 20 and allows electrons to pass through an end surface, e.g., an end surface provided with openings or holes, of the shield drum 211, bombard the first target 23, and confine X-rays emitted by the first target 23 such that X-rays emitted by the first target 23 can only exit the shield drum exit holes 212, forming a pencil X-ray beam. The shield drum 211 is configured to be rotatable about the anode first end 20 such that a pencil X-ray beam formed through the shield drum exit aperture 212 is scanned over a range of angles.
As shown in fig. 3, the pencil beam radiation source 1 further includes an armature core 215 disposed on the anode adjacent to the anode first end 20 and an armature winding 214 surrounding the armature core 215, and a plurality of permanent magnets 213 disposed on an inner wall of the shield cylinder 211 corresponding to the armature core 215 such that the armature winding 214 interacts with the plurality of permanent magnets 213 to drive the shield cylinder 211 to rotate about the anode first end 20 when the armature winding 214 forms a varying magnetic field.
As shown in fig. 3, in one embodiment, a portion of the anode first end 20 remote from the first target 23 is provided with a wiring conduit 51, one end of the driver 217 is connected to the exciting winding 214 through a cable 218, and the other end of the driver 219 is connected to the inside of the sealing joint 52 through the wiring conduit 51. After the current is applied, the armature winding 214 is continuously commutated and energized to form a rotating magnetic field, which interacts with the magnetic field generated by the plurality of permanent magnets 213 to push the shield drum 211 to perform a circular motion about the center line of the anode first end 20 as an axis. The X-ray fan beam is thus modulated into a scanning X-ray pencil beam by the rotational movement of the shield drum exit aperture 212.
In one embodiment, the anode of the combination scanning X-ray generator comprises an anode stem 5, said anode stem 5 being connected to said housing 6 for fixing said anode inside said housing 6. A routing channel 51 may be provided in the anode stem 5. The anode stem 5 includes a sealing joint 52, which is structured as shown in fig. 2, and is composed of a glass stem 521 and a conductive pin 522 sintered and sealed therein. The glass core column 521 and the anode handle 5 are fused into a closed whole through sintering and other processes; the conductive lead 522 has one end connected to the internal lead of the pencil beam radiation source 1 and the other end connected to the outside of the X-ray tube. This lead mode ensures that the inside of the X-ray tube is in a vacuum state. In addition, other sealing and fixing patterns are possible, such as flange extrusion O-ring sealing and the like.
The shield drum 211 and the outer top ring 223 may be made of tungsten or tungsten alloy material, so that the shield drum 211 and the outer top ring 223 together can effectively realize the X-ray radiation protection.
In one embodiment, the anode first end 20, sleeve 221 and inner top ring 222 are preferably made of red copper or copper alloy materials, which facilitate heat dissipation while also providing some protection against X-ray radiation.
In one embodiment, a sleeve 221 is sleeved around the anode first end 20, a bearing 220 is sleeved over the sleeve 221, and the inner wall of the inner ring of the bearing 220 is sleeved over the sleeve 221. The inner ring of the bearing 220 is restrained by the upper shoulder of the sleeve 221 and the inner top ring 222, and the outer ring is restrained by the flange of the shield cylinder 211 and the outer top ring 223. The shield cylinder 211 is mounted through the outer wall of the outer ring of the bearing 220. The inner wall of the protective drum 211 is fastened with a plurality of permanent magnets 213 and is uniformly distributed. The driver 217 is disposed on one side of the armature core 215 and is secured to the anode first end 20 by a collar 216. One side of the target spot 23 is provided with a wiring hole 51, one end of a driver 217 is connected with the exciting winding 214 through a cable 218, and the cable 219 at the other end is connected with the inner side of the sealing joint 52 through the wiring hole 51. After the current is applied, the armature winding 214 is continuously commutated and energized to form a rotating magnetic field, which interacts with the magnetic field generated by the permanent magnets 213 to push the shield drum 211 to perform a circular motion about the center line of the first anode rod 22. Thus modulating the X-ray fan beam into a continuous X-ray pencil beam by the rotational movement of the shield drum exit aperture 212
The shield cylinder 211, sleeve 221, outer top ring 223, and first anode rod 22 form a nearly closed, well-behaved X-ray shielding chamber.
As shown in fig. 1, collimator 41 surrounds anode second end 40, allows electrons to strike second target 43 through collimator 41, and confines X-rays emitted by second target 43 such that X-rays emitted by second target 43 can only exit collimator outlet 411, forming a fan-shaped X-ray beam.
Fig. 4 shows a cross-sectional view of the collimator 41. As shown in fig. 4, the collimator 41 has a fan-shaped opening, i.e. a collimator outlet 411. The shape of the collimator outlet 411 determines the profile of the outgoing X-ray beam. The end face of the collimator 41 is further provided with an opening or aperture allowing electrons to be injected into the collimator 41, from which opening or aperture on the end face of the collimator 41 electrons are injected to strike the second target 43, thereby generating X-rays. The collimator 41 may have other shapes, however, the collimator 41 needs to shield scattered electrons and generated X-rays, not only to prevent damage of electrons and rays to the surrounding environment, but also to generate a desired X-ray beam. The collimator 41 may be made of tungsten or tungsten alloy material, and may effectively realize protection against X-rays.
According to embodiments of the present disclosure, shield drum 211 and collimator 41 can modulate X-rays emitted from first target 23 and second target 43, respectively, including modulating the opening angle, emission direction, etc., of the formed fan-shaped X-ray beam. It should be appreciated that guard drum 211 and collimator 41 control the shape and direction of the X-ray beam, while the energy of the X-ray beam is controlled by the high voltage power supply between the anode and cathode, and that the energy of the X-rays emitted from first target 23 is high when the energy of electrons impinging on first target 23 is high. Thus, by controlling the voltage between the anode and the cathode, the configuration and orientation of the shield drum 211 and the collimator 41 are set, a desired X-ray beam can be obtained at both ends of the combined scanning X-ray generator, respectively. In the combined scanning X-ray generator shown in fig. 1, a first collimator may be disposed in front of the first target 23 at the first end 20 of the anode, the first collimator restricting or shaping the X-rays emitted by the first target 23, for example, to form a first fan-shaped X-ray beam, and the first fan-shaped X-ray beam passes through the protective drum 211 to form a pencil-shaped X-ray beam, and a ray exit opening angle of the first collimator defines an amplitude by which the pencil-shaped X-ray beam can scan.
In one embodiment, the pencil X-ray beam emitted from the shield drum exit aperture 212 and the fan X-ray beam emitted from the collimator exit 411 are each located in two parallel planes. As shown in fig. 5, the X-rays emitted by anode first end 20 and anode second end 40 are downward and lie in two parallel planes. It should be appreciated that fig. 5 is for illustration only, and that the X-rays emitted by anode first end 20 and anode second end 40 may be simultaneously directed upward in two parallel planes.
In the embodiment shown in fig. 6, the X-rays emitted by anode first end 20 are upward and the X-rays emitted by anode second end 40 are downward. In this embodiment, the end faces of the anode first end 20 and the anode second end 40 are oriented in opposite directions, and in fig. 6, the left end face is oriented obliquely upward and the right end face is oriented obliquely downward.
In one embodiment, the scan coverage or scan amplitude of the pencil X-ray beam emitted from the shield drum exit aperture 212 and the coverage of the fan-shaped X-ray beam emitted from the collimator exit 411 do not overlap, partially overlap, or fully overlap when viewed along the length of the anode. Fig. 7 depicts the overlapping relationship of the scan coverage of the pencil X-ray beam emitted from shield drum exit aperture 212 and the coverage of the fan X-ray beam emitted from collimator exit 411. Fig. 7 is simplified for the purpose of schematically illustrating the positional relationship of the X-ray beams at both ends of the combined scanning X-ray generator, as well as other components such as a shield drum, collimator, etc. in the view.
As shown in fig. 7a, assume that the opening angle of the scanning range or amplitude of the pencil-shaped X-ray beam emitted from the shield drum exit hole 212 corresponding to the first target 23 is α 1 The fan-shaped X-ray beam emitted from the collimator outlet 411 corresponding to the second target 43 has an opening angle α 2 The angle of the overlapping part of the opening angle ranges of the two X-ray beams is alpha 3 As shown in fig. 7 b. The effective X-ray beam opening angle alpha in this particular embodiment is not less than alpha 1 Or alpha 2 The corresponding relation is as follows:
α＝α 1 +α 2 -α 3
in the above embodiments, the opening angle α of the scan range or amplitude of the pencil-shaped X-ray beam emitted by the shield drum exit orifice 212 1 Angle of opening alpha of fan-shaped X-ray beam emitted from collimator outlet 411 2 The same applies. In another embodiment, the protective drum exit aperture 212 emits a pencil-shaped X-ray beam having an opening angle α of a scan range or amplitude 1 Angle of opening alpha of fan-shaped X-ray beam emitted from collimator outlet 411 2 Are not identical.
In one embodiment, the anode stem 5 may also be provided as a positive electrode for connecting to a high voltage power supply, in particular, may be directly grounded for negative high voltage power supplies. The anode stem 5 may be part of the anode, in other words, the anode is a one-piece. In another embodiment, the anode stem 5 may be a component connected to the anode.
The anode and the anode stem 5 may be made of red copper or a copper alloy. This facilitates conduction and reduces resistance; furthermore, the heat dissipation is facilitated; in addition, the device also has certain X-ray radiation protection capability.
In one embodiment of the present disclosure, the anode is comprised of an anode first end 20 and an anode second end 40, the anode first end 20 and the anode second end 40 being rotatable relative to each other. In this embodiment, the shield drum exit aperture 212 and collimator exit 411 are angularly offset from the original set by an angle of rotation between the anode first end 20 and the anode second end 40. For example, in the initial state, the pencil-shaped X-ray beam and the fan-shaped X-ray beam emitted by the pencil-shaped beam radiation source 1 at the anode first end 20 and the fan-shaped beam radiation source 2 at the anode second end 40, respectively, are located in two parallel planes, respectively, and the scanning range of the pencil-shaped X-ray beam and the fan-shaped X-ray beam coincide in the direction along the central axis of the anode. By relatively rotating anode first end 20 and anode second end 40, the scanning range of the pencil X-ray beam and the fan X-ray beam can be angularly offset in a direction along the central axis of the anode.
It should be appreciated that by relatively rotating anode first end 20 and anode second end 40, the overlap of the pencil X-ray beam scan range and fan X-ray beam coverage of the combination scanning X-ray generator can be changed as desired.
In one embodiment of the present disclosure, the X-ray tube components of the combined scanning X-ray generator are enclosed in one housing 6, or the pencil beam radiation source 1 and the fan beam radiation source 2 may be enclosed in two housings respectively, which are respectively and hermetically connected to both end portions of the anode stem 5.
Although a few embodiments of the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.
Claims (15)
1. A combination scanning X-ray generator comprising:
a housing;
an anode disposed within the housing, the anode comprising opposing anode first and second ends, wherein the first and second ends are opposing ends of the anode;
a pencil beam radiation source disposed within the housing and at the anode first end configured to emit a pencil beam of X-rays, wherein the pencil beam radiation source includes a first cathode configured to emit electrons within the pencil beam radiation source toward the anode first end;
a fan beam radiation source disposed within the housing and at the anode second end, configured to emit a fan beam of X-rays, wherein the fan beam radiation source comprises a second cathode configured to emit electrons within the fan beam radiation source toward the anode second end;
wherein the pencil beam radiation source and the fan beam radiation source are independently operable;
the pen-shaped beam radiation source comprises a first target, the first target is arranged on the end face of the first end of the anode, and the first target emits X rays after being bombarded by electrons; the fan-shaped beam radiation source comprises a second target which is arranged on the end face of the second end of the anode, and the second target emits X rays after being bombarded by electrons;
the first end face is not perpendicular to the length extending direction of the anode, and the second end face is not perpendicular to the length extending direction of the anode.
2. The combination scanning X-ray generator of claim 1 wherein the anode is configured such that the anode first end and the anode second end are rotatable relative to each other.
3. The combination scanning X-ray generator of claim 1 configured such that the first target of the pencil beam radiation source and the second target of the fan beam radiation source are capable of emitting X-rays either synchronously or asynchronously.
4. The combination scan X-ray generator of claim 1 wherein the combination scan X-ray generator is configured such that a voltage applied between the first cathode and the first end of the anode is equal to a voltage applied between the second cathode and the second end of the anode, thereby producing the same X-ray energy.
5. The combination scan X-ray generator of claim 1 wherein the combination scan X-ray generator is configured such that a voltage applied between the first cathode and the first end of the anode is unequal to a voltage applied between the second cathode and the second end of the anode, thereby producing different X-ray energies.
6. The combination scanning X-ray generator of claim 1 or 2, wherein,
the pencil beam radiation source includes a guard drum configured to modulate X-rays emitted by the first target into a pencil X-ray beam; and
wherein the fan beam radiation source comprises a collimator configured to modulate X-rays emitted by the second target into a fan X-ray beam.
7. The combination scanning X-ray generator of claim 6 wherein the shield drum surrounds the anode first end, allowing electrons to strike the first target through the shield drum and limiting X-rays emitted by the first target such that X-rays emitted by the first target can only exit the shield drum exit orifice forming a pencil X-ray beam.
8. The combination scanning X-ray generator of claim 6 wherein the pencil beam radiation source further comprises an armature core disposed on the anode adjacent the anode first end and an armature winding disposed around the armature core, and a plurality of permanent magnets disposed on an inner wall of the shield drum corresponding to the armature core such that the armature winding interacts with the plurality of permanent magnets to drive rotation of the shield drum about the anode first end when the armature winding forms a varying magnetic field.
9. The combination scanning X-ray generator of claim 6 wherein the collimator surrounds the anode second end, allowing electrons to strike the second target through the collimator, and limiting X-rays emitted by the second target such that X-rays emitted by the second target can only exit the collimator outlet to form a fan-shaped X-ray beam.
10. The combination scanning X-ray generator of claim 6 wherein the pencil X-ray beam emitted from the shield drum exit orifice and the fan X-ray beam emitted from the collimator exit orifice are each located in two parallel planes.
11. The combination scanning X-ray generator of claim 6 wherein the scan coverage of the pencil X-ray beam emitted from the shield drum exit aperture and the coverage of the fan-shaped X-ray beam emitted from the collimator exit do not overlap, partially overlap, or fully overlap, as viewed along the length of the anode.
12. The combination scanning X-ray generator of claim 6 wherein the angular opening of the scan range of the pencil X-ray beam emitted from the shield drum exit orifice is the same as the angular opening of the fan-shaped X-ray beam emitted from the collimator exit orifice.
13. The combination scanning X-ray generator of claim 6 wherein the angular opening of the scan range of the pencil X-ray beam emitted from the shield drum exit orifice is different from the angular opening of the fan-shaped X-ray beam emitted from the collimator exit orifice.
14. The combination scanning X-ray generator of claim 1 or 2 wherein said anode comprises an anode stem connected to said housing for securing said anode inside said housing.
15. The combination scanning X-ray generator of claim 14 wherein the anode stem comprises a cooling channel configured to flow a cooling medium.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810441775.0A CN108389768B (en) | 2018-05-10 | 2018-05-10 | Combined scanning X-ray generator |
| EP19799211.8A EP3812751A4 (en) | 2018-05-10 | 2019-05-10 | X-ray generator for hybrid scanning, hybrid examination apparatus, and examination method |
| US17/054,025 US11467105B2 (en) | 2018-05-10 | 2019-05-10 | Combined scanning x-ray generator, composite inspection apparatus, and inspection method for hybrid |
| PCT/CN2019/086445 WO2019214724A1 (en) | 2018-05-10 | 2019-05-10 | X-ray generator for hybrid scanning, hybrid examination apparatus, and examination method |
| BR112020022933-4A BR112020022933A2 (en) | 2018-05-10 | 2019-05-10 | combined scanning x-ray generator, composite inspection apparatus, and inspection method for a target to be inspected using the composite inspection apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810441775.0A CN108389768B (en) | 2018-05-10 | 2018-05-10 | Combined scanning X-ray generator |
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| CN108389768B true CN108389768B (en) | 2024-03-12 |
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| CN108389768A (en) | 2018-08-10 |
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