CN115356359B - Laser acceleration driven high-energy micro-focus X-ray large-field CT imaging device - Google Patents
Laser acceleration driven high-energy micro-focus X-ray large-field CT imaging device Download PDFInfo
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- CN115356359B CN115356359B CN202211034938.6A CN202211034938A CN115356359B CN 115356359 B CN115356359 B CN 115356359B CN 202211034938 A CN202211034938 A CN 202211034938A CN 115356359 B CN115356359 B CN 115356359B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
Abstract
The present disclosure relates to a laser acceleration driven high energy micro focus X-ray large field CT imaging device. Comprising the following steps: the device comprises a ray generation assembly, a collimation assembly, a turntable, a detector and a processor; the ray generation assembly is used for generating ray beams; the collimation component comprises a plurality of holes, so that rays are emitted from the holes respectively, and the collimation component can translate along the direction perpendicular to the emitting direction; the turntable is used for bearing a sample to be tested and rotating or rotating and translating; the detector receives the ray bundle sub-beams passing through the sample to be detected, a first image is obtained, and the detector can translate along the direction perpendicular to the emergent direction; the processor is used for reconstructing and generating a three-dimensional scanning image according to the first image. According to the laser acceleration driven high-energy micro-focus X-ray large-field CT imaging device, high-energy micro-focus rays generated by the ray generation assembly, the collimation assembly and the detector can translate, so that the imaging device meets the requirements of high resolution and large field of view at the same time.
Description
Technical Field
The disclosure relates to the technical field of imaging, in particular to a laser acceleration driven high-energy micro-focus X-ray large-field CT imaging device.
Background
Computed tomography (Computed Tomography, CT) is an imaging technique that obtains cross-sectional information of an object by projection imaging of rays that penetrate the object at different angles. The method is initially applied to the medical field, and can obtain three-dimensional image information of different tissue structures of a human body. Along with the continuous development of CT technology, the application of the CT technology is gradually expanded to the field of industrial nondestructive testing, and plays an important role in nondestructive testing of industrial parts.
With the expansion of the application field of CT technology, the performance requirements of CT imaging devices are increasingly improved, for example, the requirements of spatial resolution are gradually increased from millimeter level to micrometer level and submicron level, the requirements of penetration thickness are gradually increased from millimeter level to meter level, and the detected objects are also expanded from medical or light material to high-density metal material.
Although micro-focus X-ray machines in the related art can realize micron-level resolution, the energy is lower and the flow intensity is smaller, which means that objects with limited thickness can only be penetrated, and the micro-focus X-ray machine is commonly used in the medical field; in the field of industrial nondestructive detection, most of detection parts are metal and large in size, which means that a CT imaging device needs high-energy X-rays and has the characteristic of large visual field. The existing high-energy X-ray CT device mainly adopts a high-energy X-ray source based on an accelerator, is limited by the size of electron beam spots in millimeter level, and the source size of the CT imaging device in the related technology can only reach millimeter level, and can not obtain the size of a radiation source below millimeter or even hundreds of micrometers, so that the CT imaging device is difficult to be applied to nondestructive detection and measurement of small structures and cracks in large-scale precise workpieces.
In order to meet the requirements of high-energy and high-resolution CT imaging, a high-energy X-ray source with a micro focus is needed on one hand, and a high-resolution detector suitable for high-energy X-rays is also very important on the other hand. Nondestructive testing of large workpieces often requires coverage of a large detection range. However, the method is limited by the existing detection technology, fluorescent material preparation technology and other factors, and no radiation detection scheme which simultaneously combines a large visual field and high spatial resolution exists at present.
Disclosure of Invention
The present disclosure provides a laser acceleration driven high energy micro focus X-ray large field CT imaging device.
According to an aspect of the present disclosure, there is provided a laser acceleration driven high-energy micro-focus X-ray large-field CT imaging apparatus including: the device comprises a ray generation assembly, a collimation assembly, a turntable, a detector and a processor; the ray generation assembly is used for generating a high-energy micro-focus ray beam with a preset divergence angle; the collimating component is arranged on a plane perpendicular to the emergent direction of the high-energy micro-focus ray beam, the collimating component comprises a hole with a given size or a plurality of holes with given intervals and sizes, the high-energy micro-focus ray beam is used for emergent from the holes respectively to form a plurality of ray beam sub-beams, and the collimating component can translate along the direction perpendicular to the emergent direction; the turntable is used for bearing a sample to be measured and rotating or rotating and translating so that the beam sub-beams can irradiate a plurality of directions of the sample to be measured, and the turntable is positioned between the collimation component and the detector; the detector is used for receiving the ray bundle sub-beam passing through the sample to be detected and obtaining a first image corresponding to the ray bundle sub-beam, and the detector can translate along the direction perpendicular to the emergent direction; the processor is used for reconstructing and generating a three-dimensional scanning image of the sample to be detected according to a plurality of first images obtained in the rotating process of the turntable and the translation process of the collimation component and the detector or in the rotating and translating process of the turntable.
In one possible implementation, a radiation generating assembly includes a laser assembly, a focusing assembly, a compound conversion target assembly, a deflection assembly, and a vacuum chamber in which the laser assembly, the focusing assembly, the compound conversion target assembly, and the deflection assembly are located; the laser component is used for generating laser pulses; the focusing assembly is used for focusing the laser pulse on the front edge of the composite conversion target assembly to generate an electron beam and the high-energy micro-focus ray beam; the deflection component is used for deflecting the electron beam to deviate the electron beam from the emergent direction of the high-energy micro-focus ray beam.
In one possible implementation, the plurality of ray beam sub-beams respectively emitted from the plurality of holes form a sector area; wherein the turntable rotates and the collimation assembly and the detector translate process comprises: enabling the fan-shaped area to pass through the edge of the area where the sample to be detected is located; the turntable carries the sample to be tested to rotate gradually in a first angle range according to a specific angle interval; translating the collimation component and the detector to a preset distance towards the other edge direction of the area where the sample to be detected is located, so that the fan-shaped area passes through the sample to be detected; and iteratively performing the process of gradually rotating the rotary table within a first angle range and translating the collimation component and the detector by a preset distance until the sector area passes through the axis of the rotary table or the sector area leaves the area where the sample to be detected is located.
In one possible implementation, the plurality of ray beam sub-beams respectively emitted from the plurality of holes form a sector area; wherein, the process of revolving stage rotation and translation is carried out to the revolving stage, includes: enabling the fan-shaped area to pass through the edge of the area where the sample to be detected is located; the turntable carries the sample to be tested to rotate gradually in a first angle range according to a specific angle interval; translating the turntable by a preset distance so that the sector area passes through the sample to be measured; and iteratively executing the processing of gradually rotating the rotary table within a first angle range and translating the preset distance until the sector area passes through the axis of the rotary table or the sector area leaves the area where the sample to be detected is located.
In one possible implementation, the first angle is 360 ° in case the condition for stopping iteration is that the sector area passes through the axis of the turntable.
In a possible implementation manner, the first angle is 180 ° or 360 ° when the condition for stopping the iteration is that the sector-shaped region leaves the region where the sample to be measured is located.
In a possible implementation manner, the detector includes a plurality of detection units, the preset distance includes a first distance for translating the detector, and in the case that the number of iterations is an odd number, the first distance is greater than a separation distance between the detection units and is smaller than a length of a detection range of the detection units in the direction of translating the detector.
In a possible implementation manner, the preset distance includes a second distance for translating the detector, and in the case that the number of iterations is even, the second distance is determined according to the first distance, a distance between the detection units and a length of the detection area in the direction of translating the detector.
In one possible implementation, the processor is further configured to: correcting, registering and splicing the plurality of first images to obtain projection images of all directions of the sample to be detected; and obtaining a three-dimensional scanning image of the sample to be detected according to the projection image.
In one possible implementation, the processor is further configured to, in a case where the condition for stopping iteration is that one side of the sector area passes through the axis of the turntable: carrying out recombination processing on the projection image to obtain a recombined projection image; and obtaining the three-dimensional scanning image according to the projection image after the recombination processing.
In one possible implementation, the composite conversion target assembly includes a gas target and a solid target.
In one possible implementation, the detector comprises one or more detection units, including a flat panel detector, or a scintillator, an optical camera, and a shield; the scintillator is positioned at the opening of the shielding body, and the optical camera is positioned in the shielding body; the scintillator is used for receiving the ray beam sub-beams passing through the sample to be detected and generating optical signals; the optical camera is used for acquiring the optical signal and obtaining the first image.
According to the laser acceleration driven high-energy micro-focus X-ray large-field CT imaging device, the ray beam sub-beams in multiple directions can be respectively obtained through the holes of the collimation component, so that the ray beam sub-beams can irradiate the sample area to be measured in multiple directions at multiple angles, and noise caused by stray signals is reduced; and the local area of the sample to be detected can be irradiated from multiple angles through multiple holes, and the detected azimuth is increased through rotation of the turntable and translation of the collimation component and the detector, so that the field of view of the detection area is enlarged, and the imaging device can meet the requirements of high resolution and large field of view.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the technical aspects of the disclosure.
FIG. 1 illustrates a schematic diagram of a laser-accelerated-driven high-energy microfocus X-ray large-field CT imaging device, in accordance with an embodiment of the disclosure;
FIG. 2 illustrates a schematic plan view of a laser-accelerated high-energy microfocus X-ray large-field CT imaging device, in accordance with an embodiment of the disclosure;
FIG. 3 illustrates a schematic diagram of a turret rotation and alignment assembly and detector translation process according to an embodiment of the disclosure;
fig. 4 shows a schematic application diagram of a laser acceleration driven high energy micro focus X-ray large field CT imaging apparatus according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the disclosure will be described in detail below with reference to the drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of A, B, C, and may mean including any one or more elements selected from the group consisting of A, B and C.
Furthermore, numerous specific details are set forth in the following detailed description in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements, and circuits well known to those skilled in the art have not been described in detail in order not to obscure the present disclosure.
Fig. 1 shows a schematic diagram of a laser-accelerated-driven high-energy micro-focus X-ray large-field CT imaging apparatus according to an embodiment of the present disclosure, as shown in fig. 1, the apparatus including: a radiation generating assembly 11, a collimation assembly 12, a turntable 13, a detector 14, and a processor 15;
the ray generation assembly 11 is used for generating a high-energy micro-focus ray beam with a preset divergence angle;
the collimation component 12 is arranged on a plane perpendicular to the emergent direction of the high-energy micro-focus ray beam, and comprises a hole with a given size or a plurality of holes with given intervals and sizes, and is used for enabling the high-energy micro-focus ray beam to emerge from the holes respectively to form a plurality of ray beam sub-beams, and the collimation component can translate along the direction perpendicular to the emergent direction;
The turntable 13 is used for carrying a sample to be measured and rotating or rotating and translating, so that a plurality of directions of the sample to be measured can be irradiated by the ray beam sub-beams, and the turntable is positioned between the collimation component and the detector;
the detector 14 is configured to receive a beam of rays passing through the sample to be measured and obtain a first image corresponding to the beam of rays, and is capable of translating in a direction perpendicular to the outgoing direction;
the processor 15 is configured to reconstruct and generate a three-dimensional scan image of the sample to be measured according to a plurality of first images obtained during rotation of the turntable, and during translation of the collimation assembly and the detector, or during rotation and translation of the turntable.
According to the laser acceleration driven high-energy micro-focus X-ray large-field CT imaging device, the ray beam sub-beams in multiple directions can be respectively obtained through the holes of the collimation component, so that the ray beam sub-beams can irradiate the sample area to be measured in multiple directions at multiple angles, and noise caused by stray signals is reduced; and the local area of the sample to be detected can be irradiated from multiple angles through multiple holes, and the detected azimuth is increased through rotation of the turntable and translation of the collimation component and the detector, so that the field of view of the detection area is enlarged, and the imaging device can meet the requirements of high resolution and large field of view.
In one possible implementation, the radiation generating component 11 may be a component capable of generating a high-energy microfocus radiation beam, for example, the radiation generating component may generate X-rays or gamma-rays of different energy intervals, and the present disclosure is not limited to the type of radiation.
In one possible implementation manner, the high-energy micro-focal beam generated by the radiation generating component 11 has a certain divergence angle, for example, after the high-energy micro-focal beam exits from the radiation source, a fan shape may be formed in a plan view, and when the high-energy micro-focal beam exits from the plurality of holes of the collimating component respectively, the sub-beams of the beams respectively exiting from the plurality of holes may still form a fan shape in a plan view.
In one possible implementation, the radiation generating assembly 11 may be any device capable of generating X-rays, in an example, the radiation generating assembly 11 may be a radiation generating assembly based on laser plasma acceleration technology.
In one possible implementation, the laser plasma acceleration technique is a technique that generates and rapidly accelerates an electron beam, and when a laser pulse of relatively high intensity propagates in a plasma medium below a critical density, a plasma power is generated and positive and negative charges are separated, thereby generating a periodically varying electric field, i.e., a plasma tail field. While electrons can be accelerated in the tail field by the action of a longitudinal electric field. Since there is no limit of breakdown threshold in the plasma, the laser plasma accelerator can achieve an acceleration gradient of 3 orders of magnitude higher than the radio frequency accelerator in the related art, and thus the accelerator equipment scale can be greatly reduced. Meanwhile, due to an ultra-small accelerating structure (for example, in the order of ten micrometers to hundred micrometers) of the tail field of the plasma, the electron beam obtained by acceleration naturally has some remarkable characteristics, for example, the size of an electron beam spot in the order of micrometers.
In one possible implementation, when a laser pulse with a pulse width of femto-second order is focused into a gas target, the laser pulse ionizes the gas into plasma and interacts with the plasma to generate a high-energy electron beam, the electron beam with a micron-sized size bombards the solid target, and the electron beam and atoms in the material undergo coulomb scattering to generate bremsstrahlung radiation, so that micro-focus high-energy X-rays can be obtained, and the source size of the bremsstrahlung radiation source is in the micron order. In addition, the source size, energy and divergence angle of the high energy X-rays can be adjusted by adjusting parameters such as pulse width, beam waist radius and peak power of the laser pulses, and parameters of the conversion targets (e.g., length, material, etc. of the gas target and the solid target). Therefore, the bremsstrahlung high-energy X-ray source based on the laser plasma acceleration technology has the advantages of high energy, adjustable parameters, small focal spot size, high imaging resolution and the like, and the high-energy X-ray beam has better directivity, so that the radiation dosage of the surrounding environment can be greatly reduced, and the radiation shielding requirement is reduced. Therefore, high energy X-ray sources based on laser plasma acceleration technology have significant technical advantages in high energy X-ray microfocus, high resolution imaging applications.
In a possible implementation, in the case where the radiation generating assembly 11 is the high-energy X-ray source based on the laser plasma acceleration technique described above, the radiation generating assembly includes a laser assembly, a focusing assembly, a compound conversion target assembly, a deflection assembly, and a vacuum chamber in which the laser assembly, the focusing assembly, the compound conversion target assembly, and the deflection assembly are located; the laser component is used for generating laser pulses; the focusing assembly is used for focusing the laser pulse on the front edge of the composite conversion target assembly to generate an electron beam and the high-energy micro-focus ray beam; the deflection assembly is used for deflecting the electron beam to deviate the electron beam from the emergent direction of the rays.
Fig. 2 illustrates a schematic plan view of a laser-accelerated-driven high-energy micro-focus X-ray large-field CT imaging apparatus according to an embodiment of the present disclosure, and as illustrated in fig. 2, the radiation generating assembly 11 is the high-energy X-ray source based on the laser plasma acceleration technology described above, where the radiation generating assembly 11 may include a vacuum chamber 2, and a laser assembly 1, a focusing assembly 3, a composite conversion target assembly, which in an example may include a gas target 4 and a solid target 5, and a deflection assembly 6. The laser assembly 1, focusing assembly 3, gas target 4, solid target 5 and deflection assembly 6 are located in the vacuum chamber 2 such that radiation is generated in a vacuum environment.
In one possible implementation, the radiation generating assembly includes a laser assembly 1, the laser assembly 1 being operable to generate laser pulses, for example, femtosecond laser pulses having a center wavelength of about 800nm, a pulse length of about 20fs-30fs, a peak power of about 10TW-50TW, a single pulse energy of 0.5J-1.2J, and a beam diameter of 30mm-45 mm. The present disclosure is not limited to the specific parameters of the laser pulses generated by the laser assembly.
In one possible implementation, the laser pulses are focused to the gas target 4 by the focusing action of the focusing assembly 3. The focusing assembly 3 may be an off-axis parabolic mirror with a focal length of 480mm, and the specific type and parameters of the focusing assembly are not limited by the present disclosure.
In one possible implementation, the gas target is a gas medium sprayed from a gas nozzle, wherein the inner diameter of the gas nozzle is 0.5mm-3mm, and the pressure of the sprayed gas is 0.5Mpa-5Mpa. The laser pulse ionizes the gas target, generates an electron beam, and accelerates the electron beam through a tail wave field. The method has the advantages that the acceleration gradient for accelerating the electron beam is higher, and the energy of the electron beam can be greatly improved within a short distance, so that the space occupied by the gas target can be small, and the electron beam with higher energy can be generated. For example, the parameters such as the inner diameter of the gas nozzle and the pressure of the ejected gas can be adjusted to adjust the energy of the electron beam to 0.1MeV to 100MeV, in other words, the electron beam having the energy of 0.1MeV to 100MeV can be generated by using the gas target having the parameters. The present disclosure is not limited to parameters of the gas nozzle and energy parameters of the electron beam.
In one possible implementation, the electron beam generated above may act on the solid target 5, thereby generating high energy X-rays, the solid target 5 may be metallic tungsten with a thickness of 1mm-5mm, and after the electron beam acts on the solid target 5, bremsstrahlung may be generated. In an example, the electron beam may bombard the solid target 5 and coulomb scatter with atoms in the solid target, producing bremsstrahlung, i.e., X-rays. The present disclosure does not limit the parameters of the solid target.
In one possible implementation, the energy of the electron beam, the material and thickness of the solid target 5 are all adjustable parameters, and thus the energy, source size and divergence angle of the generated high-energy X-rays are also adjustable parameters. In another example, adjusting parameters such as pulse length, beam waist radius, peak power of the laser pulse may also enable adjustment of parameters of the radiation. In an example, the high energy X-rays generated by the above procedure have a source size of 1 μm-100 μm, an energy of 0.1MeV-100MeV, and a divergence angle of 10mrad-150mrad. The present disclosure is not limited to particular parameters of the rays.
In one possible implementation, the above process is a process in which a laser pulse acts on a composite conversion target composed of a gas target and a solid target to generate a high-energy microfocus beam, wherein the composite conversion target may also be composed of other structures, not limited to the gas target and the solid target.
In one possible implementation, the high energy microfocus beam (e.g., high energy X-rays) generated by the above process may exit the solid target with an electron beam (e.g., a beam of electrons that remains after interaction with the solid target). The residual electron beam may also be removed and only the high-energy micro-focal beam may be directed to the collimator assembly 12. In an example, the deflection assembly 6 may be used to deflect the electron beam, for example, the deflection assembly 6 may be a diode magnet that deflects the electron beam without affecting the direction of propagation of the high energy micro-focal beam. The deflected electron beam 7 fails to move into the aperture of the collimation assembly 12, and the high-energy microfocus beam may impinge on the collimation assembly 12 along the original path and may exit the aperture of the collimation assembly 12.
In one possible implementation, the above high-energy X-ray source based on the laser plasma acceleration technique is merely an example, and the radiation generating component 11 may be any device capable of generating radiation (e.g., X-rays, gamma rays, etc.), and the present disclosure is not limited to the type and structure of the radiation generating component. For example, focusing a laser pulse on a gas target ionizes the gas into a plasma and interacts, the electron beam is accelerated in the plasma wavefield and produces lateral oscillations and emits betatron radiation, i.e., X-rays; for another example, an electron beam generated by laser plasma interaction collides with another laser beam, and is subjected to inverse Compton scattering to emit X-rays.
In one possible implementation, the collimation assembly 12 may be disposed in a plane perpendicular to the emission direction of the radiation such that the high-energy microfocus radiation beam may be emitted from the plurality of apertures of the collimation assembly 12, respectively, forming a plurality of radiation beam sub-beams. Since the high-energy micro-focus ray beam has a certain divergence angle, the high-energy micro-focus ray beam may form a fan-shaped region in a plan view, and a ray beam sub-beam (for example, X-rays of a plurality of cone beams) respectively emitted from the plurality of holes may also form the fan-shaped region. In an example, the collimation assembly 12 may be made of tungsten, and the collimation assembly 12 may include a plurality of square holes of a given spacing and size.
In an example, the detector 14 may comprise one or more detection units, i.e. the detector 14 may be a detection array of detector units, the size and number of square holes may correspond to the size and number of detection units of the detector 14, e.g. a sub-beam of the radiation beam of each cone beam may correspond to one of the detection units of the detector 14. After the beam sub-beam of one cone beam exits from the set aperture, the exiting beam sub-beam may take the shape of a divergent fan due to the divergence angle, i.e. the front end of the beam sub-beam is larger than the range when exiting from the aperture, and the detection unit may capture all the beam sub-beams of the cone beam when reaching the position of the detection unit, based on which relationship (e.g. the relationship of the divergence angle, the distance, etc.), the aperture of the aperture may be determined. The materials of construction of the alignment assembly 12, as well as the shape and size of the holes, are not limiting.
In an example, the detector 14 may also comprise only one larger detector, and correspondingly, the collimator assembly may comprise only one square aperture, so that imaging may be performed directly with a single cone beam.
In one possible implementation, the turntable 13 may carry the sample to be measured, and may rotate the turntable carrying the sample to be measured, so that the sub-beams of the ray bundles of the respective cone beams can irradiate the sample to be measured in various directions. The axis of the turntable can be positioned at the center of the high-energy micro-focus ray beam, the ray beam sub-beams of the plurality of cone beams can irradiate the sample to be measured, and when the turntable rotates, the ray beam sub-beams of the plurality of cone beams can irradiate the sample to be measured in different directions. In an example, the turntable has a diameter of 80cm and can carry 100kg of the sample to be measured. The present disclosure does not limit the size and load bearing capacity of the turntable.
In one possible implementation, the collimation assembly 12 and the detector 14 can both translate along a direction perpendicular to the exit direction, so that images of the sample to be measured with more viewing angles are obtained during the translation process, and the detection field of view is increased. The detector 14 may acquire a plurality of first images during rotation of the turret and translation of the collimation assembly and the detector.
In one possible implementation, during rotation of the turret 13, the sample to be measured may face the beam sub-beams of the respective cone beams of the high-energy micro-focal beam in different orientations, so that during rotation of the turret 13, the detector 14 may obtain a first image based on the beam sub-beams of the respective cone beams passing through the sample to be measured, and the first image obtained based on the respective cone beams may be different when the turret 13 is rotated to different angles. When the turntable rotates to complete the angle range of 180 degrees or 360 degrees, the ray beams of each cone beam can irradiate each azimuth of the sample to be detected, so that the detector 14 can acquire a first image of each azimuth of the sample to be detected.
In a possible implementation manner, the collimating component 12 and the detector 14 may both translate along a direction perpendicular to the emitting direction, during the translation process, the emitting angles and positions of the beam sub-beams of each cone beam may be changed, and the turntable 13 may rotate during the translation process of the collimating component 12 and the detector 14, so that the beam sub-beams with different emitting angles may irradiate each direction of the sample to be measured, and thus the detector 14 may obtain the first images of each direction of the sample to be measured when the beam sub-beams with different angles irradiate the sample to be measured. Of course, the turntable 13 may also translate along a direction perpendicular to the emitting direction, and rotate after each translation, so that the beam sub-beams with different emitting angles may irradiate each direction of the sample to be measured, and the detector 14 obtains the first images of each direction of the sample to be measured when the beam sub-beams with different angles irradiate the sample to be measured.
In one possible implementation, the sub-beams of the ray bundles respectively emitted from the plurality of holes form a sector area; the turntable rotates, and the collimation assembly and the detector translate process, comprising: enabling the fan-shaped area to pass through the edge of the area where the sample to be detected is located; the turntable carries the sample to be tested to rotate gradually in a first angle range according to a specific angle interval; translating the collimation component and the detector to a preset distance towards the other edge direction of the area where the sample to be detected is located, so that the fan-shaped area passes through the sample to be detected; and iteratively executing the processing of enabling the rotary table to rotate gradually within a first angle range according to a specific angle interval and enabling the collimation component and the detector to translate for a preset distance until the sector area passes through the axis of the rotary table or the sector area leaves the area where the sample to be detected is located.
Fig. 3 is a schematic diagram of a turret rotation and collimation assembly and detector translation process according to an embodiment of the disclosure, where at the beginning of the turret rotation and collimation assembly 12 and detector 14 translation process, as shown in fig. 3, the detector 14 is located at position 1, and the collimation assembly 12 is located at a position corresponding to position 1, so that one side of a fan-shaped region formed by the sub-beams of the beam emitted from the collimation assembly 12 is tangent to the edge of the region where the sample to be measured is located. In an example, the sample to be measured may be a sample with a circular section, for example, a cylinder sample, a sphere sample, etc., and one side of the fan-shaped region may be tangent to an edge of the circular section of the sample to be measured. In another example, the sample to be measured is a sample having a cross-section of another shape, and one side of the fan-shaped region may be tangent to the edge of the circumscribed circle of the cross-section shape of the sample to be measured. The present disclosure does not limit the specific shape of the sample to be measured.
In one possible implementation, the turret 13 is rotated stepwise at specific angular intervals over a first angular range, carrying the sample to be measured, while the detector 14 is in position 1 and the collimator assembly 12 is in a position corresponding to position 1. The first angle may comprise 180 ° or 360 °.
In one possible implementation, during the above-described rotation, the specific angular interval may be set to 0.5 ° -1 °, and each time 0.5 ° -1 ° of rotation, an image may be acquired by the detector 14, i.e., a first image may be acquired with a rotation of 0.5 ° -1 ° orientation. During the stepwise rotation over the first angular range, a plurality of first images may be obtained, and a plurality of first images may be obtained each time, e.g. a first image corresponding to a sub-beam of the beam of each cone beam may be obtained each time.
In one possible implementation, after rotation is completed within the first angular range, the collimation assembly 12 and the detector 14 may be translated a preset distance such that one side of the fan-shaped region passes through the sample to be measured. As shown in fig. 3, detector 14 is moved to position 2 (a position that is vertically level with position 1), and based on the divergence angle of the high-energy micro-focal spot beam and the distance between collimator assembly 12 and detector 14, collimator assembly 12 is also translated accordingly such that the beam sub-beams of each cone beam exiting the aperture of collimator assembly 12 remain in corresponding relation to the detection units in detector 14. Due to the translation in a direction perpendicular to the exit direction, in this case also the sector formed by the sub-beams of the respective cone beams exiting from the aperture moves, one side of the sector passing through the area where the sample to be measured is located.
In a possible implementation, after the above-mentioned translation, the turntable 13 may be rotated again, for example, stepwise in a first angle range, and each time 0.5 ° -1 °, a first image is acquired by the detector 14, and after the rotation is completed at the first angle, a first image of a plurality of orientations of the sample to be measured may be acquired. After the translation is performed, the irradiation angles of the beam sub-beams of each cone beam emitted from the hole and the beam sub-beams of each cone beam before the translation are different, and the irradiation positions are also different, so that a first image under more directions can be acquired through the translation.
In one possible implementation, after the rotation is completed by the first angle, the collimation assembly 12 and the detector 14 may again be translated (e.g., the detector 14 translated to position 3 and the collimation assembly translated accordingly), and after translation the turntable 13 may be rotated stepwise over the first angle range to acquire a first image at more fields of view through the detector 14. The process of rotating the turret 13 stepwise over a first angular range and translating the collimator assembly 12 and the detector 14 a preset distance is performed iteratively until the sector passes through the axis of the turret or the sector leaves the area where the sample to be measured is located. The beam sub-beams of each cone beam can irradiate the sample to be measured at various angles and at various positions through translation and rotation, and in the rotation process of the sample to be measured, the beam sub-beams of each cone beam can also irradiate all directions of the sample to be measured, so that a complete view of the sample to be measured can be obtained, and the obtained first image can comprise an image of the complete view of the sample to be measured.
In one possible implementation, if the condition for stopping the iteration is that the sector area passes through the axis of the turntable, angles and orientations of the beam sub-beams of the respective cone beams may occur that are not irradiated. Thus, in this case, the field of view of the sample to be measured in the angle and orientation that is not illuminated can be determined based on symmetry during rotation. Thus, for symmetry in the rotation process, i.e. for maintaining the integrity of the projection field of view, the first angle is 360 ° in case the iteration is stopped with the sector area passing through the axis of the turntable. That is, in the process of each rotation of the turntable, the sample to be measured can be gradually rotated within a 360-degree range, so that the sample to be measured can be rotated for a complete circle, and the symmetry can be utilized to determine the field of view of the sample to be measured in the unirradiated azimuth through the field of view of the sample to be measured in the angles irradiated by the ray bundles of each cone beam, namely, the first image in the unirradiated azimuth is determined based on the first image acquired in the angles irradiated by the ray bundles of each cone beam, so that the finally obtained projection field of view of the sample to be measured in each angle is complete.
In one possible implementation, if the condition of stopping the iteration is that the sector area leaves the area where the sample to be measured is located, the beam sub-beams of each cone beam can be completely irradiated to each azimuth of the sample to be measured through the translation, and no azimuth which is not irradiated exists. Thus, in the case where the condition for stopping the iteration is that the sector area leaves the area where the sample to be measured is located, the first angle is 180 ° or 360 °. That is, even if the turntable 13 is rotated stepwise within a range of 180 ° each time, the orientation of the beam sub-beam of each cone beam irradiated to the sample to be measured is incomplete, i.e., a partial area, and through the above-described plurality of translations, the beam sub-beam of each cone beam may be irradiated to the orientation of the sample to be measured that was not irradiated before at each angle, so that the obtained field of view of the sample to be measured is complete, i.e., the obtained first image may be sufficient to complete the task of reconstructing a three-dimensional scan image each time it is rotated stepwise within a range of 180 °. Of course, when the condition of stopping iteration is that one side of the sector area leaves the area where the sample to be measured is located, the first angle can also be 360 degrees, so that the size of the projection data set is further increased, and the quality of the reconstructed three-dimensional scanning image is improved.
In one possible implementation, the distance of translation during translation of the alignment assembly 12 and the detector 14 is a predetermined distance. In an example, the detector comprises a plurality of detection units, the preset distance comprises a first distance of translation of the detector, in case the number of iterations is an odd number, theThe first distance is greater than the separation distance between the detection units and less than the length of the detection range of the detection units in the direction of detector translation. As shown in FIG. 3, the detector 14 is translated by a distance ΔD (i.e., a first distance) during the first translation (or an odd number of translations), and the distance ΔD of the translation of the collimator assembly 12 can be calculated based on parameters such as the divergence angle of the high-energy microfocus beam, and the distance between the collimator assembly 12 and the detector 14 ′ So that the sub-beams of the cone beams exiting through the respective apertures of the collimator assembly 12 are in a corresponding relationship with the detection units in the detector 14. Further, in order to enable each cone beam after translation to effectively irradiate an angle that is not irradiated before translation, each detection unit in the detector 14 is also enabled to detect an effective field of view, that is, a detection range of the detection unit after translation is enabled to cover a blind area of the detection unit before translation (that is, a space between the detection units), a translation distance Δd of the detector 14 is greater than a space distance between the detection units, so that a detection range of the detection unit after translation is enabled to cover a space distance between the detection units before translation. Meanwhile, in order to avoid missing angles, so that the field of view of the finally obtained sample to be measured is complete, the translation distance Δd of the detector 14 is smaller than the length of the detection range of the detection unit in the direction of detector translation (for example, the length of sensitive components such as a lens, a probe, and the like of the detection unit in the direction of translation). Namely, L ′ <ΔD<L, where L ′ For the separation distance between the detection units, L is the length of the detection units in the translational direction.
In one possible implementation, further, in order to reduce the first image that is completely overlapped before and after the translation, or reduce the ratio of the overlapping area in the first image acquired before and after the translation, the moving distance may be increased at the time of the second translation (or at the time of the even number of translations). The preset distance comprises a second distance for the detector to translate, and the second distance is determined according to the first distance, the interval distance between the detection units and the length of the detection area in the detector translation direction under the condition that the number of iterations is even. In an example, as shown in FIG. 3, in-processThe distance of translation (i.e., the second distance) can be made equal to the first distance DeltaD when the line translates an even number of times, the spacing distance L between the detection units ′ And the sum of the lengths L of the detection areas in the direction of detector translation, i.e. the second distance is equal to DeltaD+L+L ′ . The first images which are completely overlapped before and after the shifting can be reduced, or the proportion of the overlapping area in the first images which are acquired before and after the shifting is reduced, so that the number of the acquired first images is reduced under the condition of complete visual field, the occupation of resources for processing the first images is reduced, and the processing efficiency for processing the first images is improved.
The translation distance determined in the case where the number of iterations is odd and even is only an example, and the translation distance may be other distances, for example, the first distance may be a distance that is greater than the separation distance between the detection units and less than the length of the detection range of the detection unit in the detector translation direction, regardless of whether the number of iterations is odd or even. The specific values of the first distance are not limited by the present disclosure.
Of course, the detector may also comprise only one larger detector, so that there is no separation distance between the detection units. In this case, the distance of detector translation may be determined based on the divergence angle of the high-energy microfocus beam, equidistant from the detection region of the detector. The present disclosure does not limit the manner in which the translation distance of the detector is determined.
In one possible implementation, the turntable may also be translated, as described above, e.g. the above rotation and translation process may be accomplished by the turntable itself. The rotary table performs a process of rotation and translation, including: enabling the fan-shaped area to pass through the edge of the area where the sample to be detected is located; the turntable carries the sample to be tested to rotate gradually in a first angle range according to a specific angle interval; translating the turntable by a preset distance so that the sector area passes through the sample to be measured; and iteratively executing the processing of gradually rotating the rotary table within a first angle range and translating the preset distance until the sector area passes through the axis of the rotary table or the sector area leaves the area where the sample to be detected is located.
In one possible implementation, in this case, the rotation process of the turntable is as described above, and will not be described here. The translation of the turntable can replace the translation of the collimation component and the detector, namely, the translation of the turntable can also enable the detector to detect the sample to be detected in more directions. So that a complete field of view for the sample to be measured is also obtained during rotation and translation of the turret, in which case the first image obtained during rotation and translation of the turret comprises an image of the complete field of view of the sample to be measured.
In an example, the process of rotating the turntable and translating the collimation assembly and the detector, and the process of rotating and translating the turntable itself, may be equivalent for obtaining a complete field of view of the sample to be measured, and obtaining an image of the sample to be measured in the complete field of view, i.e., the first images obtained in both processes may be the same. In this case, the translation distance between the collimation assembly and the detector may be determined by the distance between the detection units, the length of the detection area in the translation direction of the detector, and other factors, and then the translation distance of the turntable may be determined by the position of the turntable and the distance and angle relation between the turntable and the collimation assembly and the detector during the rotation and translation of the turntable itself. The first images obtained in the above two processes are made identical, in other words, the two processes are made equivalent. That is, the distance of translation of the turret may also be determined based on the divergence angle of the high-energy microfocus beam, the detector detection area, the source-turret-detector distance, etc. The present disclosure does not limit the manner of determining the translation distance of the turntable.
In one possible implementation, as described above, the detector 14 may be a high resolution detector and may include one or more detection units that, when acquiring the first image, may convert the sub-beam of the radiation beam passing through the sample to be measured into image data to obtain the first image. The detector comprises one or more detection units, wherein the detection units comprise a flat panel detector or a scintillator, an optical camera and a shielding body; the scintillator is positioned at the opening of the shielding body, and the optical camera is positioned in the shielding body; the scintillator is used for receiving the ray beam sub-beams passing through the sample to be detected and generating optical signals; the optical camera is used for acquiring the optical signal and obtaining the first image.
In one possible implementation, as shown in fig. 2, the detection unit may include a scintillator 8, a shield 9, and an optical camera 10. The shield 9 may be a shield made of lead, which reduces interference caused by signals in the surroundings of the optical camera. The scintillator 8 may be located at an opening of the shielding 9 and may be configured to generate an optical signal, e.g. a visible light signal, when irradiated by radiation, and the scintillator 8 is coupled to the optical camera 10, i.e. the optical camera 10 may acquire the optical signal when the scintillator 8 generates the optical signal, thereby obtaining the first image. In other examples, the detection unit may also be a flat panel detector, e.g., an X-ray flat panel detection unit, the present disclosure is not limited to the type of detection unit.
In one possible implementation, if the detector includes only one larger-sized detector, the detector may also include components such as a scintillator, a shield, and an optical camera, the present disclosure is not limited in the structure of the detector.
In one possible implementation, after the first images are obtained, the processor 15 may process the plurality of first images to obtain a three-dimensional scanned image of the sample to be measured. As described above, through the translation and rotation processes, the detector 14 can obtain the first images of the sample to be measured at a plurality of angles and a plurality of orientations, so that the field of view of the sample to be measured is complete. The processor 15 may obtain a complete three-dimensional scan image of the sample to be measured based on the plurality of first images.
In one possible implementation, the processor is further configured to: correcting, registering and splicing the plurality of first images to obtain projection images of each angle and each azimuth of the sample to be detected; and obtaining a three-dimensional scanning image of the sample to be detected according to the projection image.
In one possible implementation, correction, registration, and stitching may be performed on a plurality of first images, for example, distortion correction processing may be performed on the first images, and registration processing may be performed, and a relationship between the first images, for example, a relative relationship between a shooting angle, an orientation of each first image, may be determined based on the registration processing.
In one possible implementation, after the registration, the first images may be stitched to obtain projection images corresponding to multiple orientations of the sample to be measured. For example, the sample to be measured is irradiated by the beam sub-beams with various angles, and the images obtained in the rotation process are spliced, so that projection images corresponding to various angles and various directions of the sample to be measured can be obtained. In an example, the beam sub-beams of each cone beam can obtain a plurality of first images in the process of rotating the sample to be measured for one circle, and after the plurality of first images are processed, projection images corresponding to each angle of the cone beam, that is, DR (digital radiography, digital imaging) projection images of the complete field of view of the sample to be measured under each angle can be obtained, where the projection images include the angles of view of each direction of the sample to be measured. Further, the three-dimensional scan image may be obtained from projection images (e.g., DR projection images) at respective angles.
In one possible implementation, the processor is further configured to, in a case where the condition for stopping iteration is that one side of the sector area passes through the axis of the turntable: carrying out recombination processing on the projection image to obtain a recombined projection image; and obtaining the three-dimensional scanning image according to the projection image after the recombination processing.
In one possible implementation, as described above, if the condition for stopping the iteration is that one side of the sector area passes through the axis of the turntable, the azimuth of the beam sub-beam of each cone beam irradiated to the sample to be measured is incomplete, and angles and azimuth of the beam sub-beam of each cone beam not irradiated may occur. But symmetry in the rotation process can be used for determining the field of view of the sample to be measured in the angles and orientations which are not irradiated, so that the obtained field of view of the sample to be measured is complete. In this case, the projection images may be recombined based on the detection unit position and the projection angle, so that the projection images of the respective angles and the respective orientations of the respective ray bundle sub-beams irradiated to the sample to be measured during one rotation are recombined based on symmetry during rotation into a projection image (for example, DR projection image) within a range of 180 ° having a complete field of view of the sample to be measured. And thus a three-dimensional scan image can be obtained based on the projection image. The present disclosure does not limit the image reconstruction algorithm.
According to the laser acceleration driven high-energy micro-focus X-ray large-field CT imaging device, a high-energy micro-focus ray beam can be generated through the ray generation assembly, and the resolution of a three-dimensional scanning image is improved. The beam sub-beams with multiple angles can be respectively obtained through the holes of the collimation assembly, meanwhile, the high-sensitivity high-spatial-resolution detection array system is utilized for collecting the radiation image of a local area, and the direction capable of being detected is further increased by matching with the CT scanning mode of rotating the turntable and translating the collimation assembly and the detector, so that the detection field of view is enlarged. And the translation distance is set in the translation process, so that repetition and omission are reduced, and the projection image (namely DR projection image) of the complete field of view of the sample to be measured under each angle is obtained by combining the image correction and image splicing technology, and the three-dimensional scanning image of the sample to be measured is obtained through CT reconstruction, so that the requirements of high resolution and large field of view are realized. The CT device based on detection array-image splicing can not only solve the severe requirements of a high-energy micro-focus X-ray source on spatial resolution and radiation dosage, but also avoid the technical bottleneck of a large-area high-energy X-ray detection system with high sensitivity and high spatial resolution in the existing radiation detection, and finally realize the imaging requirements of high-energy X-ray radiation with large visual field and high spatial resolution.
Fig. 4 illustrates an application schematic diagram of a laser-accelerated high-energy micro-focus X-ray large-field CT imaging apparatus according to an embodiment of the present disclosure, and as illustrated in fig. 4, a radiation generating assembly, which may be a high-energy X-ray source based on a laser plasma acceleration technique, may be provided in a case. In the case, an air conditioner or the like for controlling temperature and humidity may be further included.
In one possible implementation, the collimation assembly may be disposed at an outlet of the X-rays and include a plurality of apertures from which the X-rays may exit respectively, traveling a plurality of cone-beam sub-beams.
In one possible implementation, the turntable may be located between the collimation assembly and the detector, may carry the sample to be measured for rotation, and may also be height-adjustable.
In one possible implementation, the detector may receive a sub-beam of the radiation beam passing through the sample to be measured, convert the radiation into a visible light signal by the scintillator, and detect the visible light signal by the optical camera to obtain a plurality of first images.
In one possible implementation, during the detection, the positions of the collimation component and the detector may be adjusted, so that one side of a sector area formed by the ray bundles of the plurality of cone bundles is tangential to the area where the sample to be detected is located, and the turntable is gradually rotated within a 360-degree range, a first image can be acquired every 0.5-1 degrees, and a plurality of first images can be acquired at the end of rotation.
In one possible implementation, after rotation, the collimation assembly and the detector may be translated such that one side of the sector area passes through the area where the sample to be measured is located, and the turntable is rotated stepwise again within 360 ° range, during which rotation a plurality of first images are acquired.
In one possible implementation, the above-mentioned rotation and translation processes may be iteratively performed, and a plurality of first images are acquired, where during the translation process, when the translation is performed an odd number of times, the translation distance of the detector is Δd, and L ′ <ΔD<L, where L ′ For the separation distance between the detection units, L is the length of the detection units in the translational direction. During even translation, the translation distance of the detector is delta D+L+L ′ . The iterative process is stopped until one side of the sector area leaves the area where the sample to be measured is located. After the above process, a plurality of first images can be obtained, so that the field of view of the sample to be measured is complete.
In one possible implementation, the first image may be processed by a processor to reconstruct a three-dimensional scanned image of the sample to be measured.
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A laser acceleration driven high energy micro focus X-ray large field CT imaging apparatus, comprising: the device comprises a ray generation assembly, a collimation assembly, a turntable, a detector and a processor;
the ray generation assembly is used for generating a high-energy micro-focus ray beam with a preset divergence angle;
the collimating component is arranged on a plane perpendicular to the emergent direction of the high-energy micro-focus ray beam, the collimating component comprises a hole with a given size or a plurality of holes with given intervals and sizes, the high-energy micro-focus ray beam is used for emergent from the holes respectively to form a plurality of ray beam sub-beams, and the collimating component can translate along the direction perpendicular to the emergent direction;
the rotary table is used for bearing a sample to be measured and rotating or rotating and translating so that the ray bundle sub-beams can irradiate a plurality of directions of the sample to be measured, and the rotary table is positioned between the collimation component and the detector;
the detector is used for receiving the ray bundle sub-beam passing through the sample to be detected and obtaining a first image corresponding to the ray bundle sub-beam, and the detector can translate along the direction perpendicular to the emergent direction;
The processor is used for reconstructing and generating a three-dimensional scanning image of the sample to be detected according to a plurality of first images obtained in the rotating process of the turntable and the translation process of the collimation component and the detector or in the rotating and translation process of the turntable;
wherein a plurality of ray beam sub-beams respectively emitted from the plurality of holes form a sector area;
wherein the turntable rotates and the collimation assembly and the detector translate process comprises:
enabling the fan-shaped area to pass through the edge of the area where the sample to be detected is located;
the turntable carries the sample to be tested to rotate gradually in a first angle range according to a specific angle interval;
translating the collimation component and the detector to a preset distance towards the other edge direction of the area where the sample to be detected is located, so that the fan-shaped area passes through the sample to be detected;
iteratively performing the process of gradually rotating the turntable within a first angle range and translating the collimation assembly and the detector by a preset distance until the sector area passes through the axis of the turntable or the sector area leaves the area where the sample to be detected is located;
The detector comprises a plurality of detection units, the preset distance comprises a first distance for the detector to translate, and the first distance is larger than the interval distance between the detection units and smaller than the length of the detection range of the detection units in the direction of the detector translation under the condition that the number of iterations is odd.
2. The apparatus of claim 1, wherein the radiation generating assembly comprises a laser assembly, a focusing assembly, a compound conversion target assembly, a deflection assembly, and a vacuum chamber,
the laser assembly, the focusing assembly, the compound conversion target assembly and the deflection assembly are positioned in the vacuum chamber;
the laser component is used for generating laser pulses;
the focusing assembly is used for focusing the laser pulse on the front edge of the composite conversion target assembly to generate an electron beam and the high-energy micro-focus ray beam;
the deflection component is used for deflecting the electron beam to deviate the electron beam from the emergent direction of the high-energy micro-focus ray beam.
3. The apparatus of claim 1, wherein a plurality of sub-beams of the radiation beam respectively exiting from the plurality of apertures form a fan-shaped region;
Wherein, the process of revolving stage rotation and translation is carried out to the revolving stage, includes:
enabling the fan-shaped area to pass through the edge of the area where the sample to be detected is located;
the turntable carries the sample to be tested to rotate gradually in a first angle range according to a specific angle interval;
translating the turntable by a preset distance so that the sector area passes through the sample to be measured;
and iteratively executing the processing of gradually rotating the rotary table within a first angle range and translating the preset distance until the sector area passes through the axis of the rotary table or the sector area leaves the area where the sample to be detected is located.
4. A device according to claim 1 or 3, wherein the first angle is 360 ° in case the condition for stopping iteration is that the sector passes through the axis of the turntable.
5. A device according to claim 1 or 3, wherein the first angle is 180 ° or 360 ° in case the condition for stopping the iteration is that the sector-shaped region leaves the region where the sample to be measured is located.
6. The apparatus of claim 1, wherein the predetermined distance comprises a second distance by which the detector translates,
And in the case that the number of iterations is even, determining the second distance according to the first distance, the interval distance between the detection units and the length of the detection area in the translation direction of the detector.
7. The apparatus of claim 1 or 3, wherein the processor is further configured to:
correcting, registering and splicing the plurality of first images to obtain projection images of all directions of the sample to be detected;
and obtaining a three-dimensional scanning image of the sample to be detected according to the projection image.
8. The apparatus of claim 7, wherein the processor is further configured to, in the event that the condition to stop iterating is that the sector passes through an axis of the turntable:
carrying out recombination processing on the projection image to obtain a recombined projection image;
and obtaining the three-dimensional scanning image according to the projection image after the recombination processing.
9. The apparatus of claim 2, wherein the composite switching target assembly comprises a gas target and a solid target.
10. The apparatus of claim 1, wherein the detector comprises one or more detection units comprising a flat panel detector, or comprising a scintillator, an optical camera and a shield,
The scintillator is positioned at the opening of the shielding body, and the optical camera is positioned in the shielding body;
the scintillator is used for receiving the ray beam sub-beams passing through the sample to be detected and generating optical signals;
the optical camera is used for acquiring the optical signal and obtaining the first image.
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