Multi-energy imaging system and method

Abstract

A multi-energy imaging system and method, the multi-energy imaging system comprising: a multi-spectrum radiation source (10) configured to generate at least one of a plurality of ray radiations, the plurality of ray radiations having energy spectra of different maximum energies; a multi-energy-spectrum detector (20) capable of obtaining at least one of a plurality of energy components in the energy spectrum of the ray radiation; and the processor (30) is in signal connection with the multi-energy-spectrum radiation source (10) and the multi-energy-spectrum detector (20) and is configured to obtain energy spectrum image data of at least two matching modes between the multiple kinds of ray radiation penetrating through the detected object and the multiple kinds of energy components.

Description

Technical Field

[0001] The present disclosure relates to the field of radiation imaging, and in particular to a multi-energy imaging system and method. Background Art

[0002] In some related technologies of transmission imaging security inspection equipment, a combination of a dual-energy X-ray source and an energy spectrum integration detector is used. This dual-energy X-ray source emits two Bremsstrahlung continuous spectrum X-rays with different maximum energies, and the signals output by the energy spectrum integration detector are the results of the integration of the polychromatic photon signals of the two highest energy rays, respectively reflecting the average attenuation effect of the two highest energy rays after passing through the object. In this way, material discrimination is achieved through the difference in the attenuation coefficient of the material to X-rays of different energies. Summary of the invention

[0003] In one aspect of the present disclosure, there is provided a multi-energy imaging system, comprising:

[0004] a multi-spectrum radiation source configured to generate at least one of a plurality of types of radiation, the plurality of radiation types having energy spectra with different maximum energies;

[0005] A multi-energy spectrum detector capable of obtaining at least one of multiple energy components in the energy spectrum of the radiation; and

[0006] The processor is connected to the multi-spectrum radiation source and the multi-spectrum detector by signal, and is configured to obtain spectral image data of at least two coordination modes between multiple types of radiation and multiple energy components passing through the object to be inspected.

[0007] In some embodiments, the processor is configured to perform image fusion on energy spectrum image data of at least two coordinated modes.

[0008] In some embodiments, the processor is configured to perform substance identification based on energy spectrum image data of at least two matching modes, and perform coloring based on the identification result.

[0009] In some embodiments, the plurality of radiation radiations include at least one radiation radiation having an energy spectrum with a maximum energy less than or equal to 1 MeV and at least one radiation radiation having an energy spectrum with a maximum energy greater than 1 MeV.

[0010] In some embodiments, the multi-spectrum radiation source includes at least one of a linear accelerator, an electron beta accelerator, and a multi-ray source. In some embodiments, the multi-energy imaging system further includes:

[0011] The filter is located at the output end of the multi-spectrum radiation source and is configured to filter out at least a portion of the overlapping energy spectra of the multiple radiation rays.

[0012] In some embodiments, the multi-energy spectrum detector includes at least one of a detector with a multi-layer structure design and a detector that directly measures the intensity of the output signal.

[0013] In some embodiments, the processor is configured to switch between multiple scanning modes based on at least one of the type of object being inspected, the inspection scene, and the scanning area, and each of the multiple scanning modes is different from other scanning modes in at least the pulse combination emitted by the multi-energy spectrum radiation source in each cycle.

[0014] In some embodiments, the multiple radiation radiations include first radiation radiation having an energy spectrum with a first maximum energy, second radiation radiation having an energy spectrum with a second maximum energy, and third radiation radiation having an energy spectrum with a third maximum energy, the first maximum energy is less than or equal to 1MeV, the second maximum energy and the third maximum energy are both greater than 1MeV, and the third maximum energy is greater than the second maximum energy.

[0015] In some embodiments, the plurality of scanning modes include at least two of a first scanning mode, a second scanning mode, a third scanning mode, and a fourth scanning mode;

[0016] The processor is configured as:

[0017] In a first scanning mode, the multi-spectrum radiation source emits a first pulse combination in each cycle, wherein the first pulse combination only includes at least one pulse of the first ray radiation;

[0018] In the second scanning mode, the multi-energy spectrum radiation source emits a second pulse combination in each cycle, wherein the second pulse combination includes at least one pulse of the second ray radiation and at least one pulse of the third ray radiation;

[0019] In a third scanning mode, the multi-energy spectrum radiation source emits a third pulse combination in each cycle, wherein the third pulse combination includes at least one pulse of the second ray radiation and at least one pulse of the first ray radiation;

[0020] In the fourth scanning mode, the multi-energy spectrum radiation source emits a fourth pulse combination in each period, wherein the fourth pulse combination includes at least one pulse of the first ray radiation, at least one pulse of the second ray radiation and at least one pulse of the third ray radiation.

[0021] In some embodiments, the plurality of energy components includes a first energy component and a second energy component, the first energy component having an average energy less than an average energy of the second energy component;

[0022] The processor is configured as:

[0023] Obtaining energy spectrum image data of at least two matching modes between at least one of the first radiation, the second radiation, and the third radiation passing through the object and at least one of the first energy component and the second energy component, and performing material identification based on the energy spectrum image data of at least two matching modes;

[0024] Wherein, in the first scanning mode, the multi-energy spectrum detector is enabled to obtain the first energy component and the second energy component in the energy spectrum of the first ray radiation;

[0025] In the second scanning mode, the multi-energy spectrum detector is enabled to obtain the second energy component in the energy spectrum of the second ray radiation and the third ray radiation, or the multi-energy spectrum detector is enabled to obtain the first energy component and the second energy component in the energy spectrum of the second ray radiation and the third ray radiation;

[0026] In the third scanning mode, the multi-energy spectrum detector is enabled to obtain the second energy component in the energy spectra of the first ray radiation and the second ray radiation, or the multi-energy spectrum detector is enabled to obtain the first energy component and the second energy component in the energy spectra of the first ray radiation and the second ray radiation;

[0027] In the fourth scanning mode, the multi-energy spectrum detector obtains the second energy component in the energy spectrum of the first ray radiation, the second ray radiation and the third ray radiation, or the multi-energy spectrum detector obtains the first energy component and the second energy component in the energy spectrum of the first ray radiation, the second ray radiation and the third ray radiation.

[0028] In some embodiments, the detected object includes a truck having a cab area and a cargo compartment area, and the processor is configured to:

[0029] The multi-spectrum radiation source is used to scan the cab area in the first scanning mode or the third scanning mode, or the multi-spectrum radiation source is used not to scan the cab area;

[0030] The multi-energy spectrum radiation source is used to scan the cargo compartment area through the second scanning mode or the fourth scanning mode.

[0031] In some embodiments, the detected object includes a passenger car, and the processor is configured to:

[0032] The multi-energy spectrum radiation source is enabled to scan the entire bus through the first scanning mode or the third scanning mode, or the multi-energy spectrum radiation source is enabled not to scan the entire bus.

[0033] In one aspect of the present disclosure, a multi-energy imaging method according to the multi-energy imaging system described above is provided, comprising:

[0034] Energy spectrum image data of at least two coordination modes between multiple types of radiation and multiple energy components passing through the object to be inspected are obtained.

[0035] In some embodiments, the multi-energy imaging method further comprises:

[0036] Image fusion is performed on energy spectrum image data of at least two matching modes.

[0037] In some embodiments, the multi-energy imaging method further comprises:

[0038] The material is identified based on the energy spectrum image data of at least two matching modes, and is colored according to the identification result.

[0039] In some embodiments, the plurality of radiation radiations include at least one radiation radiation having an energy spectrum with a maximum energy less than or equal to 1 MeV and at least one radiation radiation having an energy spectrum with a maximum energy greater than 1 MeV.

[0040] In some embodiments, the multi-energy imaging method further comprises:

[0041] Switching is performed between multiple scanning modes according to at least one of the type of the object to be inspected, the inspection scene and the scanning area, and each of the multiple scanning modes is different from other scanning modes in at least the pulse combination emitted by the multi-energy spectrum radiation source in each cycle.

[0042] In some embodiments, the multiple ray radiations include first ray radiations with an energy spectrum having a first maximum energy, second ray radiations with an energy spectrum having a second maximum energy, and third ray radiations with an energy spectrum having a third maximum energy, the first maximum energy is less than or equal to 1 MeV, the second maximum energy and the third maximum energy are both greater than 1 MeV, and the third maximum energy is greater than the second maximum energy; the multiple scanning modes include at least two of a first scanning mode, a second scanning mode, a third scanning mode, and a fourth scanning mode;

[0043] Multi-energy imaging methods also include:

[0044] In a first scanning mode, the multi-spectrum radiation source emits a first pulse combination in each cycle, wherein the first pulse combination only includes at least one pulse of the first ray radiation;

[0045] In the second scanning mode, the multi-energy spectrum radiation source emits a second pulse combination in each cycle, wherein the second pulse combination includes at least one pulse of the second ray radiation and at least one pulse of the third ray radiation;

[0046] In a third scanning mode, the multi-energy spectrum radiation source emits a third pulse combination in each cycle, wherein the third pulse combination includes at least one pulse of the second ray radiation and at least one pulse of the first ray radiation;

[0047] In the fourth scanning mode, the multi-energy spectrum radiation source emits a fourth pulse combination in each period, wherein the fourth pulse combination includes at least one pulse of the first ray radiation, at least one pulse of the second ray radiation and at least one pulse of the third ray radiation.

[0048] In some embodiments, the plurality of energy components includes a first energy component and a second energy component, the first energy component having an average energy less than an average energy of the second energy component;

[0049] The step of obtaining energy spectrum image data of at least two matching modes between multiple radiations and multiple energy components passing through the object under inspection comprises:

[0050] Obtaining energy spectrum image data of at least two matching modes between at least one of the first radiation, the second radiation, and the third radiation passing through the object under inspection and at least one of the first energy component and the second energy component;

[0051] Multi-energy imaging methods also include:

[0052] Performing material identification based on energy spectrum image data of at least two matching modes;

[0053] Wherein, in the first scanning mode, the multi-energy spectrum detector is enabled to obtain the first energy component and the second energy component in the energy spectrum of the first ray radiation;

[0054] In the second scanning mode, the multi-energy spectrum detector is enabled to obtain the second energy component in the energy spectrum of the second ray radiation and the third ray radiation, or the multi-energy spectrum detector is enabled to obtain the first energy component and the second energy component in the energy spectrum of the second ray radiation and the third ray radiation;

[0055] In the third scanning mode, the multi-energy spectrum detector is enabled to obtain the second energy component in the energy spectra of the first ray radiation and the second ray radiation, or the multi-energy spectrum detector is enabled to obtain the first energy component and the second energy component in the energy spectra of the first ray radiation and the second ray radiation;

[0056] In the fourth scanning mode, the multi-energy spectrum detector obtains the second energy component in the energy spectrum of the first ray radiation, the second ray radiation and the third ray radiation, or the multi-energy spectrum detector obtains the first energy component and the second energy component in the energy spectrum of the first ray radiation, the second ray radiation and the third ray radiation.

[0057] In some embodiments, the inspected object includes a truck having a cab area and a cargo area;

[0058] Multi-energy imaging methods also include:

[0059] The multi-spectrum radiation source is used to scan the cab area in the first scanning mode or the third scanning mode, or the multi-spectrum radiation source is used not to scan the cab area;

[0060] The multi-energy spectrum radiation source is used to scan the cargo compartment area through the second scanning mode or the fourth scanning mode.

[0061] In some embodiments, the inspected object includes a passenger car;

[0062] Among them, the multi-energy imaging method also includes:

[0063] The multi-energy spectrum radiation source is enabled to scan the entire bus through the first scanning mode or the third scanning mode, or the multi-energy spectrum radiation source is enabled not to scan the entire bus. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0065] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0066] Figure 1 is a schematic diagram of the structure of some embodiments of the multi-energy imaging system according to the present disclosure;

[0067] Figure 2 is a schematic diagram of the operation of a multi-energy spectrum radiation source having multiple accelerating tubes in some embodiments of the multi-energy imaging system disclosed herein;

[0068] Figure 3 is a schematic diagram of the operation of a multi-energy spectrum radiation source having a single accelerating tube and a controlled electron gun in some embodiments of the multi-energy imaging system disclosed herein;

[0069] Figure 4A is a schematic diagram of the operation of a multi-energy spectrum radiation source having two accelerators in some embodiments of the multi-energy imaging system disclosed herein;

[0070] Figure 4B is a schematic diagram of the operation of a multi-energy spectrum radiation source having an accelerator and an X-ray machine in some embodiments of the multi-energy imaging system disclosed herein;

[0071] Figure 5 is a schematic structural diagram of other embodiments of the multi-energy imaging system according to the present disclosure;

[0072] Fig. 6A and Figure 6B They are schematic diagrams of two first pulse combination examples emitted by a multi-energy spectrum radiation source in a first scanning mode according to some embodiments of the multi-energy imaging system of the present disclosure;

[0073] Fig. 7A and Figure 7B is a schematic diagram of an example of two second pulse combinations emitted by a multi-energy spectrum radiation source in a second scanning mode according to some embodiments of the multi-energy imaging system of the present disclosure;

[0074] Fig. 8A and Figure 8B is a schematic diagram of an example of two third pulse combinations emitted by a multi-energy spectrum radiation source in a third scanning mode according to some embodiments of the multi-energy imaging system of the present disclosure;

[0075] Fig. 9A , Fig. 9B , Fig. 9C , Fig.9D , Fig.9E and Fig.9F is a schematic diagram of examples of four fourth pulse combinations emitted by a multi-energy spectrum radiation source in a fourth scanning mode according to some embodiments of the multi-energy imaging system of the present disclosure;

[0076] Fig. 10A , Fig. 10B , Fig. 10C , Fig. 10D and Fig. 10E is a schematic diagram of vehicle area scanning and detector acquisition in a truck inspection scenario according to some embodiments of the multi-energy imaging system of the present disclosure;

[0077] Fig.11A and Fig. 11B It is a schematic diagram of scanning and detector acquisition of a whole bus in a bus inspection scenario according to some embodiments of the multi-energy imaging system disclosed herein.

[0078] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0079] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0080] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0081] In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0082] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0083] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0084] In some related technologies of transmission imaging security inspection equipment, a combination of a dual-energy X-ray source and an energy spectrum integration detector is used. This dual-energy X-ray source emits two bremsstrahlung continuous spectrum X-rays with different maximum energies, and the signals output by the energy spectrum integration detector are the results of the integration of the polychromatic photon signals of the two highest energy rays, respectively reflecting the average attenuation effect of the two highest energy rays after passing through the object. In this way, material discrimination is achieved through the difference in the attenuation coefficient of the material under different energy X-rays.

[0085] Research has found that these related technologies have some applicability issues in terms of imaging indicators and material identification. In terms of imaging indicators, MeV-level dual-energy X-rays can penetrate heavy cargo and high-Z (high atomic number) materials, and are more suitable for large container cargo detection applications. However, for imaging of light and thin material areas, the generated images have low contrast and details are easily lost. Organic substances such as drugs, explosives, and banknotes are easily missed due to their low atomic numbers. Reflected in the spatial wire resolution (Wire Detectability, referred to as WD) indicator, the typical value of the MeV-level high-energy imaging system is relatively poor.

[0086] In terms of material identification, MeV-level dual-energy X-rays have better recognition effects on thicker materials. However, when the thickness is thin, the poor detection sensitivity leads to inaccurate recognition of different materials, which is not conducive to the system's intelligent identification and suspicious object alarm.

[0087] In addition, for scenarios where there is a need for cab scanning, the dual-energy X-ray source can only use high-energy scanning for the vehicle's cab, which requires the driver to leave the vehicle in advance, affecting the inspection efficiency to a certain extent; alternatively, a low-energy X-ray machine can be added for scanning, but this will lead to increased system complexity and cost.

[0088] In view of this, the embodiments of the present disclosure provide a multi-energy imaging system and method, which can improve the adaptability to the object under inspection.

[0089] Figure 1 Schematic diagram of the structure of some embodiments of the multi-energy imaging system according to the present disclosure. Figure 1 The embodiment of the present disclosure provides a multi-energy imaging system, including: a multi-energy spectrum radiation source 10, a multi-energy spectrum detector 20 and a processor 30. The multi-energy spectrum radiation source 10 is configured to generate at least one of multiple types of radiation. Here, the multi-energy spectrum radiation source 10 can generate multiple types of radiation, and can generate part or all of the multiple types of radiation according to the received control signal.

[0090] A variety of ray radiations have energy spectra with different maximum energies. Here, the energy spectrum of ray radiation represents the continuous distribution of photon energy, which may include the Bremsstrahlung continuous spectrum, and the maximum energy may be the maximum photon energy in the Bremsstrahlung continuous spectrum. Figure 1 In the figure, the dashed line with arrows indicates that the radiation emitted by the multi-energy spectrum radiation source 10 and passing through the object under inspection 4 is received by the multi-energy spectrum detector 20.

[0091] The multi-energy spectrum detector 20 can obtain at least one of the multiple energy components in the energy spectrum of the radiation. Here, the multi-energy spectrum detector 20 can obtain multiple energy components in the energy spectrum of the radiation, including obtaining a part or all of the multiple energy components. Taking the dual-energy spectrum integrating detector as an example, this multi-energy spectrum detector 20 can obtain two energy components in the energy spectrum of the radiation. The average energies of these two energy components are different, and they can be respectively called low-energy components and high-energy components. The average energy of each low-energy component and high-energy component can be obtained by dividing the total energy of photons deposited by the low-energy detection element and the high-energy detection element in the dual-energy spectrum integrating detector by the number of deposited photons and obtaining the quotient.

[0092] The energy spectrum may include multiple energy components corresponding to different energy ranges, and the multi-spectrum detector 20 may be designed to simultaneously acquire multiple energy components or selectively acquire at least one of the multiple energy components, and be able to distinguish different energy components. For the Bremsstrahlung continuous spectrum, the multi-spectrum detector 20 can simultaneously acquire multiple energy components in the Bremsstrahlung continuous spectrum or selectively acquire at least one energy component in the Bremsstrahlung continuous spectrum.

[0093] The processor 30 is signal-connected to the multi-spectrum radiation source 10 and the multi-spectrum detector 20, and is configured to obtain spectral image data of at least two coordinated modes between multiple types of radiation and multiple energy components passing through the object under inspection.

[0094] The processor 30 may be implemented at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: a microprocessor, a microcontroller, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), an application specific standard product (ASSP), a system on a chip (SOC), a complex programmable logic device (CPLD), etc. The processor 30 may be signal-connected to the multi-spectrum radiation source 10 and the multi-spectrum detector 20 by wired communication or wireless communication.

[0095] When scanning and imaging the inspected object by the multi-spectrum radiation source 10, multiple radiations are used in conjunction with the multi-spectrum detector 20 to detect multiple energy components, and multiple coordination modes can be realized, such as two or more coordination modes of two or more radiations in conjunction with the detection of one energy component, or two or more coordination modes of one radiation in conjunction with the detection of two or more energy components, or more coordination modes of two or more radiations in conjunction with the detection of two or more energy components, etc. In this way, energy spectrum image data of at least two coordination modes can be obtained in one scan, and energy spectrum image data of various coordination modes can reflect richer feature information of the inspected object, which is beneficial to subsequent operations such as image processing, material identification and analysis, and can effectively improve the adaptability of imaging the inspected object.

[0096] On this basis, the processor can be configured to perform image fusion on at least two coordinated energy spectrum image data. By fusing at least two coordinated energy spectrum image data, the fused image can reflect richer feature information of the inspected object, improve imaging indicators, and thus effectively improve the adaptability of the imaging system to imaging the inspected object.

[0097] The image fusion algorithm used for the energy spectrum image data of at least two matching modes can be implemented by a traditional computer image processing algorithm or a deep learning algorithm. For example, the traditional computer image processing algorithm can use the ORB (Oriented FAST and Rotated BRIEF) method or the SIFT (Scale Invariant Feature Transform) method to detect key points, and use the BF algorithm (Brute Force) to achieve feature matching, and finally perform weight allocation and fusion according to the characteristics of the image area.

[0098] Image fusion based on deep learning algorithms can use supervised or unsupervised algorithms. In model training, supervised algorithms can use high-dose or oversampled images as ground truth image samples. In the fusion model, the autoencoder extracts deep features and uses the spatial transformer (ST) to fuse multi-scale features. The ST fusion block consists of a CNN and a Transformer branch, which capture local and long-range features respectively. The evaluation of the fusion model can be achieved through the Generative Adversarial Network (GAN), which optimizes the network by alternating the training of the generative model and the discriminative model to achieve the Nash equilibrium state, thereby achieving the best fusion effect.

[0099] Unsupervised algorithms can be implemented through information protection. Considering the problem that different source images contain inconsistent information, information metrics can be estimated by extracting shallow features (texture, local shape, etc.) and deep features (content, spatial structure, etc.). During the training process, the final loss function is obtained according to the information protection weight. Feature-level image fusion is to extract feature information from the source image, such as the edge and contour of the object being inspected, and then analyze, process and integrate these feature information to obtain the fused image features. The accuracy of target recognition of the fused features will be significantly higher than that of the original image.

[0100] In some embodiments, the processor 30 is configured to perform material identification based on the energy spectrum image data of at least two matching modes, and coloring based on the identification results. Here, coloring can be coloring the fused image after image fusion based on the identification results, or coloring the energy spectrum images of at least two matching modes based on the identification results.

[0101] In terms of material identification, the energy spectrum image data obtained in at least two matching modes can reflect the characteristic information of the radiation of different maximum energies passing through the inspected object. Through table lookup, support vector machine (SVM) or logistic regression and other methods, the classification and identification of the substances contained in the inspected object can be realized, thereby improving the classification accuracy. Moreover, the fused image or the energy spectrum image in at least two matching modes is colored according to the identified classification information, so that different substances in the image are clearly shown in different colors, which improves readability and facilitates users of the multi-energy imaging system to quickly understand and verify the image.

[0102] In some embodiments, the plurality of radiation radiations include at least one radiation radiation having an energy spectrum with a maximum energy less than or equal to 1 MeV and at least one radiation radiation having an energy spectrum with a maximum energy greater than 1 MeV.

[0103] Radiation with an energy spectrum with a maximum energy less than or equal to 1MeV (such as keV-level radiation such as 200keV, 300keV, 500keV or 800keV, or 1MeV radiation) can achieve low-energy scanning of the object under inspection. This low-energy scanning is safer, has relatively low radiation hazards to the human body, and is suitable for scanning light and thin material areas.

[0104] In terms of the spatial wire resolution (Wire Detectability, abbreviated as WD), the typical value of the keV-level imaging system is 0.6mm, so it can generate higher-contrast scanning images with more detailed information in the imaging of light and thin material areas.

[0105] In terms of material identification, radiation with a spectrum with a maximum energy of less than or equal to 1MeV can be used with a multi-spectrum detector to identify materials in thin material areas. In this way, the resolution of materials can be more finely distinguished according to the relative atomic number of the material, and can cover various materials with low mass thickness.

[0106] Radiation with a spectrum with a maximum energy greater than 1MeV (such as 3MeV, 4MeV, 6MeV, 9MeV and other MeV-level radiation) can penetrate thick materials and materials with higher atomic numbers, meeting the imaging requirements of thick materials and materials with higher atomic numbers. Radiation with a spectrum with a maximum energy greater than 1MeV is combined with radiation with a spectrum with a maximum energy less than or equal to 1MeV to meet the imaging requirements of materials with a wider range of mass thickness and a wider range of atomic numbers, obtain scanning images with higher contrast and more details, and reduce the risk of missing detection of materials with different atomic numbers. The thick material here refers to materials with higher mass thickness.

[0107] In terms of material identification, dual-energy radiation with a spectrum with a maximum energy greater than 1MeV is more effective in identifying thick and heavy materials and materials with higher atomic numbers. Considering that different thin and light materials have little difference in attenuation of this high-energy radiation, it is not easy to identify.

[0108] Radiation with a spectrum with a maximum energy of less than or equal to 1MeV combined with a multi-spectrum detector can effectively identify thin materials, while radiation with a spectrum with a maximum energy greater than 1MeV can effectively identify thick materials. Therefore, through the combination of the two, material identification with a wider mass thickness range can be achieved, and the classification according to the atomic number of the material is more delicate and accurate.

[0109] In this way, by generating richer and more comprehensive energy spectrum image data, it is possible to perform matching optimization in image fusion and other aspects according to the physical and chemical characteristics of the inspected object and the aspects of interest to the inspector (such as penetration, thin material details, specific materials, etc.), so as to obtain more targeted images. For example, it is possible to simultaneously achieve the non-loss of information on thick and heavy material areas and image information on thin and light material areas, or to improve the imaging contrast of materials with similar attenuation coefficients, not limited to the four categories of organic matter, inorganic matter, mixtures, and heavy metals, or to make the range of values ​​of material mass thickness and atomic number applicable to material identification wider and more accurate. Intelligent identification of suspects based on material identification structure helps to improve the work efficiency of inspectors.

[0110] In the embodiments of the present disclosure, the multi-spectrum radiation source can be implemented in a variety of forms. The multi-spectrum radiation source can emit a variety of X-ray pulses (such as an accelerator or a pulsed X-ray machine) or DC X-rays (such as an X-ray machine) with different maximum energies in a certain time sequence. The X-ray pulses or DC X-rays can be emitted by the following devices or a combination of devices.

[0111] 1. X-ray machine - uses high voltage electric field to accelerate electrons, hit the anode target to produce X-rays, and obtain single energy X-ray pulses or DC X-rays. X-ray machine can be used in conjunction with accelerator.

[0112] 2. Electron beta accelerator - uses the induced electric field generated by the time-varying magnetic field to accelerate electrons, which collide with the anode target to produce X-rays, and control the electron extraction time to obtain multi-energy pulses. Electron beta accelerators can be used alone or in conjunction with X-ray machines, other electron beta accelerators or linear accelerators.

[0113] 3. Linear accelerator - a resonant accelerator using a high-frequency electric field to accelerate electrons and then hit the anode target to produce X-rays. Depending on the different configurations and parameter settings of the microwave power source or electron gun, multi-energy pulses can be obtained using a single accelerator tube or multiple accelerator tubes in a single accelerator. A linear accelerator can be used alone or in conjunction with an X-ray machine, an induction accelerator or other linear accelerators.

[0114] For multi-spectrum radiation sources in different implementation forms, if the radiation sources have different target positions, an operation of registering the spectral image data may be added.

[0115] Figure 2 FIG. 1 is a schematic diagram of the operation of a multi-energy spectrum radiation source having multiple accelerating tubes in some embodiments of the multi-energy imaging system disclosed herein. Figure 2 In some embodiments, the multi-spectrum radiation source 10 includes a linear accelerator having a plurality of accelerating tubes 111, 112, ..., 11n. The plurality of accelerating tubes 111, 112, ..., 11n are configured to generate a plurality of radiations respectively.

[0116] For a scenario where multiple accelerating tubes 111, 112, ..., 11n have different target positions, the processor 30 may perform image registration on the energy spectrum image data corresponding to at least two of the multiple ray radiations according to the target positions of the multiple accelerating tubes 111, 112, ..., 11n before performing image fusion on the energy spectrum image data of at least two matching modes, so as to perform image fusion on the registered energy spectrum image data. Figure 2 In the figure, the range of radiation emitted by each accelerating tube is indicated by dashed lines, dotted lines and double-dotted lines.

[0117] This multi-spectrum radiation source uses multiple accelerating tubes with targets at different physical positions to generate multiple radiations, which enables the imaging system to generate scanning images at different angles, thereby obtaining richer spatial information and reducing the adverse effects of overlapping objects on imaging in the penetration direction of the radiation. Moreover, multiple accelerating tubes can be spatially arranged according to specific needs to adapt to different application scenarios and inspection objects, thereby helping to increase the application range of the imaging system.

[0118] In some embodiments, multiple accelerating tubes can be configured with the same accelerator, and the targets of each accelerating tube can be set at positions close to each other. The acquired images are processed by an image registration algorithm before fusion. The images corresponding to each target can be registered according to the geometric projection relationship of the feature points to eliminate ghosting.

[0119] Image registration algorithms are used to determine the spatial mapping relationship between the pixels of one image and the pixels of another image. For scanned images corresponding to different targets, the aforementioned ORB (Oriented FAST and Rotated BRIEF) method or SIFT (Scale Invariant Feature Transform) method can also be used for key point detection, and the BF algorithm (Brute Force) can be used to achieve feature matching. After matching multiple pairs of key points, the scanned image is geometrically transformed through the homography matrix.

[0120] Figure 3 FIG. 1 is a schematic diagram of the operation of a multi-energy spectrum radiation source having a single accelerating tube and a controlled electron gun in some embodiments of the multi-energy imaging system disclosed herein. Figure 3 In some embodiments, the multi-spectrum radiation source 10 includes a single accelerating tube 12 and a control electron gun 13, and the control electron gun 13 is connected to the single accelerating tube 12 to enable the single accelerating tube 12 to generate multiple types of radiation. Figure 3 In the figure, the range of radiation emitted by a single accelerating tube is indicated by a double-dotted line.

[0121] This multi-energy spectrum radiation source uses a controlled electron gun to achieve multi-energy beam output from a single accelerating tube, and the angle of the ray radiation generated by the target point of the single accelerating tube can be relatively fixed, so the generated scanning image can omit the image registration operation before fusion.

[0122] In other embodiments, the multi-spectrum radiation source 10 may include a single accelerating tube and a controlled microwave power source. The controlled microwave power source may be connected to the single accelerating tube and enable the single accelerating tube to generate multiple ray radiations.

[0123] Figure 4A FIG. 1 is a schematic diagram of the operation of a multi-energy spectrum radiation source having two accelerators in some embodiments of the multi-energy imaging system disclosed herein. Figure 4A In some embodiments, the multi-spectrum radiation source 10 includes two accelerators 14 and 15. The two accelerators 14 and 15 are capable of generating multiple types of radiation.

[0124] The two accelerators 14 and 15 can be both single-energy accelerators, both multi-energy accelerators, or both single-energy accelerators and multi-energy accelerators, respectively. The two accelerators 14 and 15 can be both linear accelerators, both betatron accelerators, or both linear accelerators and betatron accelerators, respectively.

[0125] For a scenario where multiple accelerating tubes 111, 112, ..., 11n have different target positions, the processor 30 can perform image registration on the energy spectrum image data corresponding to at least two of the multiple ray radiations according to the target positions of the two accelerators 14 and 15, so as to perform image fusion on the registered energy spectrum image data. Figure 4A In the figure, the ranges of radiation emitted by the single-energy accelerator and the dual-energy accelerator are indicated by dashed lines and dot-dash lines, respectively.

[0126] This multi-spectrum radiation source can generate a variety of radiation with different maximum energy spectra by combining multiple existing accelerators. It is more economical to implement and helps reduce costs. In addition, the number and type of accelerators can be replaced or adjusted according to changes in actual needs to enhance adaptability.

[0127] Figure 4B FIG. 1 is a schematic diagram of the operation of a multi-energy spectrum radiation source having an accelerator and an X-ray machine in some embodiments of the multi-energy imaging system disclosed herein. Figure 4B In some embodiments, the multi-spectrum radiation source may further include an X-ray machine 17 and an accelerator 18. The accelerator 18 may be a linear accelerator or an electron induction accelerator. In terms of quantity, the multi-spectrum radiation source 10 may include one or more accelerators and one or more X-ray machines.

[0128] Figure 5 Schematic diagram of the structure of some other embodiments of the multi-energy imaging system according to the present disclosure. Figure 5 In some embodiments, the multi-energy imaging system further includes a filter 16. The filter 16 is located at the output end of the multi-energy spectrum radiation source 10 and is configured to filter out at least a portion of the energy spectra of the multiple radiations that overlap. Figure 5 In the figure, the dashed line with an arrow indicates that the radiation emitted by the multi-energy spectrum radiation source 10 passes through the filter 16 and the object under inspection 4 and is received by the multi-energy spectrum detector 20.

[0129] For multiple types of radiation, there may be overlapping parts between each continuous energy spectrum. By setting a filter 16 at the output end of the multi-spectrum radiation source 10, at least part of the overlapping energy spectra of multiple radiations is filtered out, so as to reduce the overlap of multiple continuous spectra, separate two adjacent energy spectra as much as possible, and further widen the equivalent energy gap of the energy spectra of multiple radiations in the multi-energy mode, so that each radiation can be distinguished more clearly, and reduce the mutual influence between overlapping radiations.

[0130] In the selection of the multi-energy spectrum detector 20, the multi-energy spectrum detector 20 may include at least one of a detector with a multi-layer structure design and a detector that directly measures the intensity of the output signal. For example, the detector with a multi-layer structure design may include a dual-energy spectrum integration detector.

[0131] The dual-energy spectrum integrating detector includes a double-layer scintillation crystal and a photoelectric sensor (such as a photodiode, PD for short). The double-layer scintillation crystal has different positions and thicknesses, which can distinguish high-energy radiation from low-energy radiation, such as high-energy X-ray radiation and low-energy X-ray radiation. The X-ray first passes through a thinner detector, and the deposition ratio of X-ray photons in the low-energy spectrum range is higher, and the low-energy component in the energy spectrum is obtained, which can be used to identify thin materials. At the same time, the deposition ratio of X-ray photons in the high-energy spectrum range is lower, and the X-ray photons in the high-energy spectrum range that pass through the thin detector are received by the thicker detector, and the high-energy component in the energy spectrum is obtained, which can be used to identify thick materials. Considering that the energy spectra of the multi-energy radiation source have overlapping parts, in order to improve the energy spectrum separation capability, filters can be added to minimize spectral overlap.

[0132] For example, a detector that directly measures the intensity of an output signal may include a SiPM spectrally resolved photon counting detector or a semiconductor detector.

[0133] SiPM spectrum-resolving photon counting detectors include scintillation crystals and silicon photomultiplier (SiPM) photoelectric sensors. This detector can set different gating thresholds to divide the energy spectrum of radiation (such as the X-ray continuous spectrum) into multiple energy intervals, and perform energy discrimination and counting on each incident photon to obtain multiple energy components in the energy spectrum.

[0134] Semiconductor detectors, such as high-purity germanium HPGe detectors, cadmium zinc telluride CZT and other compound semiconductor detectors, can directly form electrical signals through incident radiation (such as X-rays) to measure radiation, and cooperate with multi-channel energy spectrum analyzers to form radiation energy spectrum data with high energy resolution.

[0135] In various application scenarios of the multi-energy imaging system, based on the different maximum energy radiation that the multi-spectrum radiation source can provide, the processor can pre-configure multiple scanning modes to match different types of objects under inspection, different inspection scenarios in which the objects under inspection are located, and / or different inspection areas of the objects under inspection.

[0136] In some embodiments, the processor 30 is configured to switch between multiple scanning modes according to at least one of the type of the object being inspected, the inspection scene, and the scanning area, and each of the multiple scanning modes is different from other scanning modes in at least the pulse combination emitted by the multi-energy spectrum radiation source 10 in each cycle.

[0137] The types of objects to be inspected here may include goods, vehicles, etc. Vehicles may be further subdivided into cars, trains, aircraft, ships, etc. According to the content or operation mode of the load, cars may be further subdivided into buses, trucks, etc., or unmanned vehicles, manned vehicles, etc. Inspection scenes of inspected objects may include airports, ports, station entrances, etc. Inspection areas of inspected objects may include different areas of the inspected object divided in at least one direction, or sides in different directions, or areas that implement different functions and different inspection requirements, such as the cab area and cargo compartment area of ​​a truck.

[0138] The pulse combination emitted by the multi-spectrum radiation source 10 in each cycle in each scanning mode is different from the pulse combination emitted by the multi-spectrum radiation source 10 in each cycle in other scanning modes. The types of radiation contained in different pulse combinations are at least partially different. For example, in the first scanning mode, the pulse combination emitted by the multi-spectrum radiation source 10 in each cycle includes radiation a and radiation b, which are abbreviated as [a, b] here. Then, in the second scanning mode, the pulse combination [a], [b], [a, c], [b, c] or [c] emitted by the multi-spectrum radiation source 10 in each cycle is different from the pulse combination [a, b] corresponding to the first scanning mode.

[0139] For ease of understanding, a multi-spectrum radiation source 10 capable of emitting three types of ray radiation is used as an example. In this embodiment, the multiple ray radiations include a first ray radiation i1 having an energy spectrum with a first maximum energy, a second ray radiation i2 having an energy spectrum with a second maximum energy, and a third ray radiation i3 having an energy spectrum with a third maximum energy. The first maximum energy is less than or equal to 1 MeV, the second maximum energy and the third maximum energy are both greater than 1 MeV, and the third maximum energy is greater than the second maximum energy. For example, the first maximum energy is 0.5 MeV, the second maximum energy is 4 MeV, and the third maximum energy is 7 MeV. For another example, the first maximum energy is 0.3 MeV, the second maximum energy is 3 MeV, and the third maximum energy is 6 MeV. For another example, the first maximum energy is 0.6 MeV, the second maximum energy is 6 MeV, and the third maximum energy is 9 MeV.

[0140] Fig. 6A and Figure 6B They are schematic diagrams of two examples of first pulse combinations emitted by a multi-energy spectrum radiation source in a first scanning mode according to some embodiments of the multi-energy imaging system of the present disclosure. Fig. 7A and Figure 7B is a schematic diagram of examples of two second pulse combinations emitted by a multi-energy spectrum radiation source in a second scanning mode according to some embodiments of the multi-energy imaging system of the present disclosure. Fig. 8A and Figure 8Bis a schematic diagram of examples of two third pulse combinations emitted by a multi-energy spectrum radiation source in a third scanning mode according to some embodiments of the multi-energy imaging system of the present disclosure. Fig. 9A , Fig. 9B , Fig. 9C , Fig.9D , Fig.9E and Fig.9F is a schematic diagram of examples of four fourth pulse combinations emitted by a multi-energy spectrum radiation source in a fourth scanning mode according to some embodiments of the multi-energy imaging system of the present disclosure.

[0141] refer to FIG. 6A to FIG. 9D In some embodiments, the plurality of scanning modes include at least two of a first scanning mode, a second scanning mode, a third scanning mode, and a fourth scanning mode; the processor 30 is configured to:

[0142] In the first scanning mode, the multi-spectrum radiation source 10 emits a first pulse combination in each cycle, and the first pulse combination only includes at least one pulse of the first ray radiation i1;

[0143] In the second scanning mode, the multi-spectrum radiation source 10 emits a second pulse combination in each cycle, wherein the second pulse combination includes at least one pulse of the second ray radiation i2 and at least one pulse of the third ray radiation i3;

[0144] In the third scanning mode, the multi-spectrum radiation source 10 emits a third pulse combination in each cycle, wherein the third pulse combination includes at least one pulse of the second ray radiation i2 and at least one pulse of the first ray radiation i1;

[0145] In the fourth scanning mode, the multi-spectrum radiation source 10 emits a fourth pulse combination in each period, the fourth pulse combination including at least one pulse of the first ray radiation i1, at least one pulse of the second ray radiation i2 and at least one pulse of the third ray radiation i3.

[0146] exist FIG. 6A to FIG. 9D In the figure, the horizontal axis represents the pulse timing of the multi-spectrum radiation source 10, t on the horizontal axis represents a cycle, the pulse combination is repeated according to the cycle, and the vertical axis represents the maximum energy of the ray pulse corresponding to each pulse. In each figure, the black arrows indicate the several types of ray radiation corresponding to the pulses contained in each cycle, namely i1, i2 and i3.

[0147] Fig. 6A and Figure 6B Two first pulse combinations emitted by the multi-energy spectrum radiation source in the first scanning mode are shown respectively, wherein: Fig. 6A The first pulse combination in includes only two pulses of the first ray radiation i1, Figure 6BThe first pulse combination in the first scanning mode only includes a single pulse of the first ray radiation i1. The first pulse combination in the first scanning mode has a strong material resolution capability for light and thin material areas, can be applied to imaging and material identification of light and thin materials, and can reduce the radiation dose to the object being inspected and improve safety. Fig. 6A and Figure 6B The first pulse combination shown can be used for detecting detection areas with limited radiation dose and requirements for imaging and material identification, such as material identification in a driver's cab area or scanning of a passenger car.

[0148] Fig. 7A and Figure 7B Two second pulse combinations emitted by the multi-energy spectrum radiation source in the second scanning mode are shown respectively, wherein: Fig. 7A The second pulse combination in comprises a single pulse of the second ray radiation i2 and a single pulse of the third ray radiation i3, Figure 7B The second pulse combination in the second scanning mode includes two pulses of the second ray radiation i2 and two pulses of the third ray radiation i3. The second pulse combination in the second scanning mode has strong penetrating power and can be applied to imaging and material identification of thick and heavy materials.

[0149] Fig. 8A and Figure 8B Two third pulse combinations emitted by the multi-energy spectrum radiation source in the third scanning mode are respectively shown, wherein: Fig. 8A The third pulse combination in comprises a single pulse of the second ray radiation i2 and a single pulse of the first ray radiation i1, Figure 8B The third pulse combination in the third scanning mode includes two pulses of the second ray radiation i2 and two pulses of the first ray radiation i1. The third pulse combination in the third scanning mode can be applied to the detection of the detection area with limited radiation dose and imaging and material recognition requirements, such as material recognition in the cab area.

[0150] FIG. 9A to FIG. 9F Four fourth pulse combinations emitted by the multi-energy spectrum radiation source in the fourth scanning mode are shown respectively, wherein: Fig. 9A and Fig. 9B The fourth pulse combination in includes a single pulse of the first ray radiation i1, a single pulse of the second ray radiation i2 and a single pulse of the third ray radiation i3. Fig. 9C The fourth pulse combination in comprises a single pulse of the second ray radiation i2, a single pulse of the third ray radiation i3 and two pulses of the first ray radiation i1, Fig.9D The fourth pulse combination in includes a single pulse of the second ray radiation i2, a single pulse of the third ray radiation i3, and four pulses of the first ray radiation i1.

[0151] Fig.9EThe fourth pulse combination in comprises a single pulse of the second ray radiation i2, a single pulse of the third ray radiation i3 and six pulses of the first ray radiation i1, Fig.9F The fourth pulse combination in the fourth scanning mode includes two pulses of the second ray radiation i2, two pulses of the third ray radiation i3 and four pulses of the first ray radiation i1. The fourth pulse combination in this fourth scanning mode can be applied to the scanning of the cargo part, which can achieve strong penetration and meet the needs of imaging and material identification of thick and heavy materials and materials with higher atomic numbers. Using one or more pulses of the first ray radiation i1 can increase the total output and sampling rate of the ray radiation with an energy spectrum with a maximum energy less than or equal to 1MeV, thereby improving the image effect and spatial resolution of the thin material area.

[0152] refer to FIG. 9C to FIG. 9F The fourth pulse combination emits a pulse of the third ray radiation i3 at the beginning of the period, and the number of pulses of the first ray radiation i1 can be a multiple of 2, for example Fig. 9C The two pulses in Fig.9D and Fig.9F The four pulses and Fig.9E For the fourth pulse combination of a single pulse or two pulses including the first ray radiation i1, the pulse of the first ray radiation i1 may be emitted at positions such as T / 4, T / 3, 2T / 3, or 3T / 4. For the fourth pulse combination of four pulses including the first ray radiation i1, the pulse of the first ray radiation i1 may be emitted at positions such as T / 6, T / 3, 2T / 3, 5T / 6, T / 8, 3T / 8, 5T / 8, or 7T / 8. For the fourth pulse combination of six pulses including the first ray radiation i1, the pulse of the first ray radiation i1 may be emitted at positions such as T / 8, T / 4, 3T / 8, 5T / 8, 3T / 4, or 7T / 8.

[0153] For the scanning mode, in addition to distinguishing by the pulse combination emitted by the multi-energy spectrum radiation source 10 in each cycle, it is also possible to further distinguish by the energy components in the energy spectrum that can be sensed by the multi-energy spectrum detector 20.

[0154] In some embodiments, the plurality of energy components include a first energy component and a second energy component, the average energy of the first energy component is less than the average energy of the second energy component; the processor 30 is configured to:

[0155] Obtaining energy spectrum image data of at least two coordination modes between various pulse combinations passing through the object under inspection and at least one of the first energy component and the second energy component, and performing material identification based on the energy spectrum image data of at least two coordination modes;

[0156] Wherein, in the first scanning mode, the multi-spectrum detector 20 is enabled to obtain the first energy component and the second energy component in the energy spectrum of the first ray radiation i1;

[0157] In the second scanning mode, the multi-energy spectrum detector 20 obtains the second energy component in the energy spectrum of the second ray radiation i2 and the third ray radiation i3, or the multi-energy spectrum detector 20 obtains the first energy component and the second energy component in the energy spectrum of the second ray radiation i2 and the third ray radiation i3;

[0158] In the third scanning mode, the multi-energy spectrum detector 20 is enabled to obtain the second energy component in the energy spectra of the first ray radiation i1 and the second ray radiation i2, or the multi-energy spectrum detector 20 is enabled to obtain the first energy component and the second energy component in the energy spectra of the first ray radiation i1 and the second ray radiation i2;

[0159] In the fourth scanning mode, the multi-energy spectrum detector 20 obtains the second energy component in the energy spectrum of the first ray radiation i1, the second ray radiation i2 and the third ray radiation i3, or the multi-energy spectrum detector 20 obtains the first energy component and the second energy component in the energy spectrum of the first ray radiation i1, the second ray radiation i2 and the third ray radiation i3.

[0160] For the first scanning mode, since the first pulse combination emitted by the multi-energy spectrum radiation source 10 only includes the pulse of the first ray radiation i1, in order to realize material identification, the multi-energy spectrum detector 20 detects both the first energy component and the second energy component in the energy spectrum of the first ray radiation i1. In this way, the multi-energy spectrum detector 20 can further determine parameters such as the equivalent atomic number of the material by comparing and analyzing the absorption data of the high-energy component and the low-energy component in the continuous spectrum of the first ray radiation i1.

[0161] For the second scanning mode, the third scanning mode and the fourth scanning mode, since the second, third and fourth pulse combinations emitted by the multi-spectrum radiation source 10 include pulses of two or three types of radiation, the high-energy component detection by the multi-spectrum detector 20 can realize material identification, and it is beneficial to reduce energy consumption. These three modes can also use the multi-spectrum detector 20 to detect high-energy components and low-energy components to form more energy spectrum image data, which is beneficial to improve the resolution and accuracy of material identification.

[0162] Fig. 10A , Fig. 10B , Fig. 10C , Fig. 10D and Fig. 10E FIG. 1 is a schematic diagram of vehicle area scanning and detector acquisition in a truck inspection scenario according to some embodiments of the multi-energy imaging system disclosed in the present invention. FIG. 10A to FIG. 10ETaking the scenario where a driver drives a truck through a multi-energy imaging system including a multi-energy accelerator (6 / 3 / 0.3MeV) and a dual-energy detector (1mm~8mm / 20mm~60mm double-layer CsI scintillation crystal + PD photoelectric sensor) for a quick inspection as an example, the scanning mode of vehicle area inspection is explained.

[0163] In this scenario, the inspected object includes a truck having a cab area 41 and a cargo compartment area 42. Accordingly, the processor 30 is configured to: enable the multi-energy spectrum radiation source 10 to scan the cab area 41 through the first scanning mode or the third scanning mode, or enable the multi-energy spectrum radiation source 10 not to scan the cab area 41; enable the multi-energy spectrum radiation source 10 to scan the cargo compartment area 42 through the second scanning mode or the fourth scanning mode.

[0164] The multi-energy accelerator may include a pulse modulator, an X-ray machine and a constant temperature water cooling system. Through a microwave power and microwave transmission system arranged in the X-ray machine, a 6 / 3MeV accelerating tube and a 0.3MeV accelerating tube, it can output 6 / 3 / 0.3MeV X-ray pulses according to a predetermined pulse quantity ratio and a predetermined timing. Here, the 6 / 3 / 0.3MeV X-ray pulses correspond to FIG. 10A to FIG. 10E i3, i2 and i1 in .

[0165] The dual-energy detector has two layers of scintillation crystals along the incident direction of X-rays. The X-ray photons first pass through the 4mm thick low-energy scintillation crystal CsI to generate low-energy component image signals, and then pass through the 30mm thick high-energy scintillation crystal CsI to generate high-energy component image signals. Here, the low-energy scintillation crystal CsI and the high-energy scintillation crystal CsI correspond to FIG. 10A to FIG. 10E s1 and s2 in .

[0166] refer to Fig. 10A When the driver drives the truck into the scanning channel, the vehicle type recognition system (such as multi-light curtain photoelectric, multiple groups of light curtains with vertical high light curtains, laser sensors, visible light and other vehicle type recognition technologies) identifies the vehicle type and provides real-time vehicle speed, vehicle outline, cab length and other information, thereby determining the cab area 41 and cargo compartment area 42 of the truck. The multi-energy imaging system scans the inspected truck in different areas based on the above identification information, and uses the first ray radiation i1 of 0.3MeV to scan the cab area alone, and then quickly switches to three ray radiations i3, i2 and i1 (i.e. 6 / 3 / 0.3MeV) to achieve multi-energy alternating scanning of the cargo compartment area 42. This is equivalent to making the multi-energy spectrum radiation source 10 scan the cab area 41 through the first scanning mode, and making the multi-energy spectrum radiation source 10 scan the cargo compartment area 42 through the fourth scanning mode.

[0167] Since the targets of the two accelerating tubes of the multi-energy accelerator are arranged in a spatially dislocated manner and are separated by a preset distance (e.g., 25mm, 30mm, or 37mm, etc.), the energy spectrum image data corresponding to the two targets need to be registered according to the geometric projection relationship of the feature points to eliminate ghosting. According to the information characterizing the penetration ability (e.g., grayscale value) contained in each original energy spectrum image data, the effective information is fused into an image (e.g., grayscale image) according to the image weight. In the fused image, good spatial wire resolution index and penetration index can be simultaneously reflected, and the whole image index and image effect can be improved without switching between high and low energy, so that it can effectively penetrate the thick material area and minimize the loss of information in the thin material area.

[0168] For the cab area 41, material recognition is achieved through a pulse matching dual energy detector of 0.3 MeV ray radiation, while for the cargo compartment area 42, material recognition in the light material area can be achieved through a pulse matching dual energy detector of 0.3 MeV ray radiation of the first ray radiation, and material recognition in the thick material area can be achieved through a pulse matching high energy detector of the third ray radiation and the second ray radiation (i.e., 6 / 3 MeV). The material recognition image is obtained through image fusion, so as to color the image obtained after the previous image registration and fusion.

[0169] refer to Fig. 10B , different from Fig. 10A The avoidance mode is used for the cab area 41, that is, the multi-spectrum radiation source 10 does not scan the cab area 41, which can greatly improve the safety of the driver during the scanning process. When scanning the cargo compartment area 42, the material identification of the light material area can be achieved through the pulse matching dual-energy detector of the first ray radiation 0.3MeV ray radiation, and the material identification of the thick material area can be achieved through the pulse matching high-energy detector of the third ray radiation and the second ray radiation (i.e. 6 / 3MeV), which is equivalent to the multi-spectrum radiation source 10 scanning the cargo compartment area 42 through the fourth scanning mode.

[0170] refer to Fig. 10C , different from Fig. 10A The advantages are mainly in three aspects. On the one hand, the cab area 41 and the cargo compartment area 42 only use the high-energy component detection function of the dual-energy detector, which can reduce costs. On the other hand, for the cab area 41, the high-energy scintillation crystal CsI of the dual-energy detector is matched by the pulses of 0.3MeV radiation and 3MeV radiation. This is equivalent to making the multi-energy spectrum radiation source 10 scan the cab area 41 through the third scanning mode, and cooperate with the high-energy component detection of the multi-energy spectrum detector. In this way, while the driver's safety is met by scanning with a pulse combination of pulses containing 0.3MeV radiation, the material identification of the cab is realized by dual-energy scanning of the cab area 41.

[0171] The third aspect is that for the cargo compartment area 42, the imaging of light and thin material areas and thick and heavy material areas can be achieved by using a high-energy detector with a pulse of 0.3MeV of the first ray radiation and a pulse matching of the third ray radiation and the second ray radiation (ie 6 / 3MeV), and energy consumption can be effectively saved.

[0172] refer to Fig. 10D , different from Fig. 10A The difference is that for both the cab area 41 and the cargo compartment area 42, only the high-energy component detection function of the dual-energy detector is used. In this case, the cab imaging can be realized without the need for the material identification of the cab, and the driver's safety can be ensured. For the cargo compartment area 42, the material identification of the light and thin material area and the thick and heavy material area can be realized by matching the pulse of the first ray radiation 0.3MeV ray radiation and the pulse of the third ray radiation and the second ray radiation (i.e. 6 / 3MeV) with the high-energy detector, and energy consumption can be effectively saved.

[0173] refer to Fig. 10E ,and Fig. 10A The difference is that for the cargo compartment area 42, the material recognition of the thick material area is achieved by the pulse matching dual energy detector of the third ray radiation and the second ray radiation (i.e. 6 / 3MeV). The material recognition image is obtained by image fusion, so as to color the image obtained after the previous image registration and fusion.

[0174] Fig.11A and Fig. 11B It is a schematic diagram of scanning and detector acquisition of a whole bus in a bus inspection scenario according to some embodiments of the multi-energy imaging system disclosed herein.

[0175] refer to Fig.11A and Fig. 11B , taking the scenario of rapid inspection of a passing bus by a multi-energy imaging system including a multi-energy accelerator (6 / 3 / 0.3MeV) and a dual-energy detector (1mm~8mm / 20mm~60mm double-layer CsI scintillation crystal + PD photoelectric sensor) as an example, the scanning mode of the vehicle inspection is explained.

[0176] In this scenario, the inspected object includes a bus 40 , and accordingly, the processor 30 is configured to: enable the multi-energy spectrum radiation source 10 to scan the entire bus 40 through the first scanning mode or the third scanning mode, or enable the multi-energy spectrum radiation source 10 not to scan the entire bus 40 .

[0177] The configuration of the multi-energy accelerator and dual-energy detector can be found in the previous FIG. 10A to FIG. 10D The description will not be repeated here.

[0178] refer to Fig.11A When the driver drives the bus 40 into the scanning channel, the vehicle type recognition system (such as multi-light curtain photoelectric, multiple groups of light curtains with vertical high light curtains, laser sensors, visible light and other vehicle type recognition technologies) identifies the vehicle type and provides real-time vehicle speed, vehicle outline and other information, thereby determining that the vehicle is a bus type. Based on the above recognition information, the multi-energy imaging system uses a single beam of 0.3MeV first ray radiation i1 to scan the entire bus 40. This is equivalent to making the multi-energy spectrum radiation source 10 perform a full-vehicle scan of the bus 40 through the first scanning mode.

[0179] refer to Fig. 11B , different from Fig.11A The purpose is to scan the entire bus 40 by matching the pulses of 0.3MeV radiation and 3MeV radiation to the high-energy scintillation crystal CsI of the dual-energy detector, which is equivalent to making the multi-energy spectrum radiation source 10 scan the entire bus 40 through the third scanning mode and cooperate with the detection of high-energy components of the multi-energy spectrum detector. In this way, while the safety of the driver and other people in the car is met by scanning with a pulse combination including pulses of 0.3MeV radiation, the material identification of the bus is realized through dual-energy scanning.

[0180] Refer to the above FIG. 10A to FIG. 11B , the dual-energy detector in the multi-energy imaging system can be replaced with a SiPM spectrum-resolving photon counting detector to detect more energy components in the X-ray radiation spectrum, thereby obtaining better material identification effects and better image indicators. Accordingly, the processor can control the pulse of the X-ray radiation output by the multi-energy accelerator and the energy component detection selected by the SiPM spectrum-resolving photon counting detector according to the business scenario of truck or bus inspection.

[0181] Based on the multi-energy imaging system of each of the above embodiments, in one aspect of the present disclosure, a multi-energy imaging method of the multi-energy imaging system according to any of the above embodiments is also provided. The multi-energy imaging method includes:

[0182] Energy spectrum image data of at least two coordination modes between multiple types of radiation and multiple energy components passing through the object to be inspected are obtained.

[0183] When scanning and imaging the object to be inspected by the multi-spectrum radiation source 10, multiple radiations are used in conjunction with the multi-spectrum detector 20 to detect multiple energy components, and multiple coordination methods can be implemented, such as two or more coordination methods of more than two radiations in conjunction with the detection of one energy component, or two or more coordination methods of one radiation in conjunction with the detection of two or more energy components, or more than two radiations in conjunction with the detection of two or more energy components. In this way, energy spectrum image data of at least two coordination methods can be obtained in one scan, and energy spectrum image data of various coordination methods can reflect richer feature information of the object to be inspected, which is beneficial to subsequent operations such as image processing, material identification and analysis, and can effectively improve the adaptability of imaging the object to be inspected.

[0184] In some embodiments, the multi-energy imaging method further includes: performing image fusion on energy spectrum image data of at least two coordinated modes.

[0185] By fusing at least two coordinated energy spectrum image data, the fused image can reflect richer feature information of the inspected object, improve imaging indicators, and thus effectively improve the adaptability of the imaging system to imaging the inspected object.

[0186] In some embodiments, the multi-energy imaging method further includes: identifying substances according to the energy spectrum image data of at least two matching modes, and coloring according to the identification results. The coloring here can be coloring the fused image after image fusion according to the identification results, or coloring the energy spectrum images of at least two matching modes according to the identification results.

[0187] In some embodiments, the plurality of radiation radiations include at least one radiation radiation having an energy spectrum with a maximum energy less than or equal to 1 MeV and at least one radiation radiation having an energy spectrum with a maximum energy greater than 1 MeV.

[0188] In some embodiments, the multi-energy imaging method also includes: switching between multiple scanning modes according to at least one of the type of the object to be inspected, the inspection scene and the scanning area, and each of the multiple scanning modes is different from other scanning modes in at least the pulse combination emitted by the multi-energy spectrum radiation source 10 in each cycle.

[0189] In some embodiments, the multiple ray radiations include first ray radiation i1 with an energy spectrum having a first maximum energy, second ray radiation i2 with an energy spectrum having a second maximum energy, and third ray radiation i3 with an energy spectrum having a third maximum energy, the first maximum energy is less than or equal to 1MeV, the second maximum energy and the third maximum energy are both greater than 1MeV, and the third maximum energy is greater than the second maximum energy; the multiple scanning modes include at least two of the first scanning mode, the second scanning mode, the third scanning mode and the fourth scanning mode.

[0190] Accordingly, the multi-energy imaging method also includes:

[0191] In the first scanning mode, the multi-spectrum radiation source 10 emits a first pulse combination in each cycle, and the first pulse combination only includes at least one pulse of the first ray radiation i1;

[0192] In the second scanning mode, the multi-spectrum radiation source 10 emits a second pulse combination in each cycle, wherein the second pulse combination includes at least one pulse of the second ray radiation i2 and at least one pulse of the third ray radiation i3;

[0193] In the third scanning mode, the multi-spectrum radiation source 10 emits a third pulse combination in each cycle, wherein the third pulse combination includes at least one pulse of the second ray radiation i2 and at least one pulse of the first ray radiation i1;

[0194] In the fourth scanning mode, the multi-spectrum radiation source 10 emits a fourth pulse combination in each period, the fourth pulse combination including at least one pulse of the first ray radiation i1, at least one pulse of the second ray radiation i2 and at least one pulse of the third ray radiation i3.

[0195] In some embodiments, the multiple energy components include a first energy component and a second energy component, and the average energy of the first energy component is less than the average energy of the second energy component; the step of obtaining energy spectrum image data of at least two coordination modes between multiple ray radiations passing through the object to be inspected and the multiple energy components includes: obtaining energy spectrum image data of at least two coordination modes between at least one of the first ray radiation i1, the second ray radiation i2, and the third ray radiation i3 passing through the object to be inspected and at least one of the first energy component and the second energy component.

[0196] Accordingly, the multi-energy imaging method also includes:

[0197] Performing material identification based on energy spectrum image data of at least two matching modes;

[0198] Wherein, in the first scanning mode, the multi-spectrum detector 20 is enabled to obtain the first energy component and the second energy component in the energy spectrum of the first ray radiation i1;

[0199] In the second scanning mode, the multi-energy spectrum detector 20 obtains the second energy component in the energy spectrum of the second ray radiation i2 and the third ray radiation i3, or the multi-energy spectrum detector 20 obtains the first energy component and the second energy component in the energy spectrum of the second ray radiation i2 and the third ray radiation i3;

[0200] In the third scanning mode, the multi-energy spectrum detector 20 is enabled to obtain the second energy component in the energy spectra of the first ray radiation i1 and the second ray radiation i2, or the multi-energy spectrum detector 20 is enabled to obtain the first energy component and the second energy component in the energy spectra of the first ray radiation i1 and the second ray radiation i2;

[0201] In the fourth scanning mode, the multi-energy spectrum detector 20 obtains the second energy component in the energy spectrum of the first ray radiation i1, the second ray radiation i2 and the third ray radiation i3, or the multi-energy spectrum detector 20 obtains the first energy component and the second energy component in the energy spectrum of the first ray radiation i1, the second ray radiation i2 and the third ray radiation i3.

[0202] In some embodiments, the inspected object includes a truck having a cab area 41 and a cargo compartment area 42. Accordingly, the multi-energy imaging method further includes: enabling the multi-energy spectrum radiation source 10 to scan the cab area 41 through the first scanning mode or the third scanning mode, or enabling the multi-energy spectrum radiation source 10 not to scan the cab area 41; enabling the multi-energy spectrum radiation source 10 to scan the cargo compartment area 42 through the second scanning mode or the fourth scanning mode.

[0203] In some embodiments, the inspected object includes a bus 40 ; wherein the multi-energy imaging method further includes: enabling the multi-energy spectrum radiation source 10 to perform a whole-vehicle scan of the bus 40 through a first scanning mode or a third scanning mode, or enabling the multi-energy spectrum radiation source 10 not to scan the whole-vehicle scan of the bus 40 .

[0204] In this specification, multiple embodiments are described in a progressive manner, and the focus of each embodiment is different, and the same or similar parts between the embodiments can be referred to each other. For the method embodiment, since its overall and the steps involved correspond to the content in the system embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the system embodiment.

[0205] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0206] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A multi-energy imaging system, comprising: A multi-spectrum radiation source (10) configured to generate at least one of a plurality of types of radiation, wherein the plurality of types of radiation have energy spectra with different maximum energies; A multi-energy spectrum detector (20) capable of obtaining at least one of multiple energy components in the energy spectrum of the radiation; and A processor (30) is signal-connected to the multi-spectrum radiation source (10) and the multi-spectrum detector (20), and is configured to obtain spectral image data of at least two coordination modes between the multiple types of radiation passing through the object under inspection and the multiple energy components.

2. The multi-energy imaging system according to claim 1, wherein: The processor (30) is configured to perform image fusion on the energy spectrum image data of the at least two coordination modes.

3. The multi-energy imaging system according to claim 1, wherein: The processor (30) is configured to perform substance identification based on the energy spectrum image data of the at least two matching modes, and perform coloring based on the identification result.

4. The multi-energy imaging system according to any one of claims 1 to 3, wherein: The plurality of radiations include at least one type of radiation having an energy spectrum with a maximum energy less than or equal to 1 MeV and at least one type of radiation having an energy spectrum with a maximum energy greater than 1 MeV.

5. The multi-energy imaging system according to claim 1, wherein: The multi-spectrum radiation source (10) comprises: a combination of one or more of a linear accelerator, an electron beta accelerator and an X-ray machine.

6. The multi-energy imaging system according to claim 1, further comprising: The filter (16) is located at the output end of the multi-spectrum radiation source (10) and is configured to filter out at least a portion of the overlapping energy spectra of the multiple types of radiation.

7. The multi-energy imaging system according to claim 1, wherein: The multi-energy spectrum detector (20) comprises at least one of a detector with a multi-layer structure design and a detector that directly measures the intensity of an output signal.

8. The multi-energy imaging system according to claim 1, wherein: The processor (30) is configured to switch between multiple scanning modes according to at least one of the type of the object to be inspected, the inspection scene and the scanning area, and each of the multiple scanning modes is different from other scanning modes in at least the combination of pulses emitted by the multi-spectrum radiation source (10) in each cycle.

9. The multi-energy imaging system according to claim 8, wherein: The multiple ray radiations include first ray radiation (i1) having an energy spectrum with a first maximum energy, second ray radiation (i2) having an energy spectrum with a second maximum energy, and third ray radiation (i3) having an energy spectrum with a third maximum energy, wherein the first maximum energy is less than or equal to 1 MeV, the second maximum energy and the third maximum energy are both greater than 1 MeV, and the third maximum energy is greater than the second maximum energy.

10. The multi-energy imaging system according to claim 9, wherein: The plurality of scanning modes include at least two of a first scanning mode, a second scanning mode, a third scanning mode, and a fourth scanning mode; The processor (30) is configured to: In a first scanning mode, the multi-spectrum radiation source (10) emits a first pulse combination in each cycle, wherein the first pulse combination only includes at least one pulse of the first ray radiation (i1); In a second scanning mode, the multi-spectrum radiation source (10) emits a second pulse combination in each cycle, wherein the second pulse combination includes at least one pulse of the second ray radiation (i2) and at least one pulse of the third ray radiation (i3); In a third scanning mode, the multi-spectrum radiation source (10) emits a third pulse combination in each cycle, wherein the third pulse combination includes at least one pulse of the second ray radiation (i2) and at least one pulse of the first ray radiation (i1); In a fourth scanning mode, the multi-spectrum radiation source (10) emits a fourth pulse combination in each cycle, wherein the fourth pulse combination includes at least one pulse of the first ray radiation (i1), at least one pulse of the second ray radiation (i2), and at least one pulse of the third ray radiation (i3).

11. The multi-energy imaging system according to claim 10, wherein: The plurality of energy components include a first energy component and a second energy component, wherein an average energy of the first energy component is less than an average energy of the second energy component; The processor (30) is configured to: Obtaining energy spectrum image data of at least two coordination modes between various pulse combinations passing through the object under inspection and at least one of the first energy component and the second energy component, and performing material identification according to the energy spectrum image data of the at least two coordination modes; Wherein, in the first scanning mode, the multi-energy spectrum detector (20) is enabled to obtain a first energy component and a second energy component in the energy spectrum of the first ray radiation (i1); In the second scanning mode, the multi-energy spectrum detector (20) is enabled to obtain a second energy component in the energy spectrum of the second ray radiation (i2) and the third ray radiation (i3), or the multi-energy spectrum detector (20) is enabled to obtain a first energy component and a second energy component in the energy spectrum of the second ray radiation (i2) and the third ray radiation (i3); In the third scanning mode, the multi-energy spectrum detector (20) is enabled to obtain a second energy component in the energy spectrum of the first ray radiation (i1) and the second ray radiation (i2), or the multi-energy spectrum detector (20) is enabled to obtain a first energy component and a second energy component in the energy spectrum of the first ray radiation (i1) and the second ray radiation (i2); In the fourth scanning mode, the multi-energy spectrum detector (20) obtains the second energy component in the energy spectrum of the first ray radiation (i1), the second ray radiation (i2) and the third ray radiation (i3), or the multi-energy spectrum detector (20) obtains the first energy component and the second energy component in the energy spectrum of the first ray radiation (i1), the second ray radiation (i2) and the third ray radiation (i3).

12. The multi-energy imaging system according to claim 10 or 11, wherein: The detected object comprises a truck having a cab area (41) and a cargo compartment area (42), and the processor (30) is configured to: enabling the multi-spectrum radiation source (10) to scan the cab area (41) through the first scanning mode or the third scanning mode, or enabling the multi-spectrum radiation source (10) not to scan the cab area (41); The multi-spectrum radiation source (10) is enabled to scan the cargo compartment area (42) through the second scanning mode or the fourth scanning mode.

13. The multi-energy imaging system according to claim 10 or 11, wherein: The inspected object includes a passenger car (40), and the processor (30) is configured to: The multi-spectrum radiation source (10) is used to perform a full-vehicle scan of the bus (40) using the first scanning mode or the third scanning mode, or the multi-spectrum radiation source (10) is not used to perform a full-vehicle scan of the bus (40).

14. A multi-energy imaging method according to any one of claims 1 to 13, comprising: Energy spectrum image data of at least two coordination modes between the multiple types of radiation passing through the object and the multiple energy components are obtained.

15. The multi-energy imaging method according to claim 14, further comprising: Image fusion is performed on the energy spectrum image data of the at least two matching modes.

16. The multi-energy imaging method according to claim 14, further comprising: The substances are identified according to the energy spectrum image data of the at least two matching modes, and are colored according to the identification results.

17. The multi-energy imaging method according to any one of claims 14 to 16, wherein: The plurality of radiations include at least one type of radiation having an energy spectrum with a maximum energy less than or equal to 1 MeV and at least one type of radiation having an energy spectrum with a maximum energy greater than 1 MeV.

18. The multi-energy imaging method according to claim 14, further comprising: Switching is performed between multiple scanning modes according to at least one of the type of the inspected object, the inspection scene and the scanning area, wherein each scanning mode in the multiple scanning modes is different from the other scanning modes in at least a pulse combination emitted by the multi-energy spectrum radiation source (10) in each cycle.

19. The multi-energy imaging method according to claim 18, wherein: The multiple ray radiations include first ray radiation (i1) having an energy spectrum with a first maximum energy, second ray radiation (i2) having an energy spectrum with a second maximum energy, and third ray radiation (i3) having an energy spectrum with a third maximum energy, the first maximum energy is less than or equal to 1 MeV, the second maximum energy and the third maximum energy are both greater than 1 MeV, and the third maximum energy is greater than the second maximum energy; the multiple scanning modes include at least two of a first scanning mode, a second scanning mode, a third scanning mode, and a fourth scanning mode; The multi-energy imaging method further comprises: In a first scanning mode, the multi-spectrum radiation source (10) emits a first pulse combination in each cycle, wherein the first pulse combination only includes at least one pulse of the first ray radiation (i1); In a second scanning mode, the multi-spectrum radiation source (10) emits a second pulse combination in each cycle, wherein the second pulse combination includes at least one pulse of the second ray radiation (i2) and at least one pulse of the third ray radiation (i3); In a third scanning mode, the multi-spectrum radiation source (10) emits a third pulse combination in each cycle, wherein the third pulse combination includes at least one pulse of the second ray radiation (i2) and at least one pulse of the first ray radiation (i1); In a fourth scanning mode, the multi-spectrum radiation source (10) emits a fourth pulse combination in each cycle, wherein the fourth pulse combination includes at least one pulse of the first ray radiation (i1), at least one pulse of the second ray radiation (i2), and at least one pulse of the third ray radiation (i3).

20. The multi-energy imaging method according to claim 19, wherein: The plurality of energy components include a first energy component and a second energy component, wherein an average energy of the first energy component is less than an average energy of the second energy component; The step of obtaining energy spectrum image data of at least two coordination modes between the multiple types of radiation passing through the object under inspection and the multiple energy components comprises: Obtaining energy spectrum image data of at least two coordination modes between at least one of the first radiation (i1), the second radiation (i2) and the third radiation (i3) passing through the object and at least one of the first energy component and the second energy component; The multi-energy imaging method further comprises: Performing material identification according to the energy spectrum image data of the at least two coordination modes; Wherein, in the first scanning mode, the multi-energy spectrum detector (20) is enabled to obtain a first energy component and a second energy component in the energy spectrum of the first ray radiation (i1); In the second scanning mode, the multi-energy spectrum detector (20) is enabled to obtain a second energy component in the energy spectrum of the second ray radiation (i2) and the third ray radiation (i3), or the multi-energy spectrum detector (20) is enabled to obtain a first energy component and a second energy component in the energy spectrum of the second ray radiation (i2) and the third ray radiation (i3); In the third scanning mode, the multi-energy spectrum detector (20) is enabled to obtain a second energy component in the energy spectrum of the first ray radiation (i1) and the second ray radiation (i2), or the multi-energy spectrum detector (20) is enabled to obtain a first energy component and a second energy component in the energy spectrum of the first ray radiation (i1) and the second ray radiation (i2); In the fourth scanning mode, the multi-energy spectrum detector (20) obtains the second energy component in the energy spectrum of the first ray radiation (i1), the second ray radiation (i2) and the third ray radiation (i3), or the multi-energy spectrum detector (20) obtains the first energy component and the second energy component in the energy spectrum of the first ray radiation (i1), the second ray radiation (i2) and the third ray radiation (i3).

21. The multi-energy imaging method according to claim 19 or 20, wherein: The inspected object comprises a truck having a cab area (41) and a cargo compartment area (42); The multi-energy imaging method further comprises: enabling the multi-spectrum radiation source (10) to scan the cab area (41) through the first scanning mode or the third scanning mode, or enabling the multi-spectrum radiation source (10) not to scan the cab area (41); The multi-spectrum radiation source (10) is enabled to scan the cargo compartment area (42) through the second scanning mode or the fourth scanning mode.

22. The multi-energy imaging method according to claim 19 or 20, wherein: The inspected object includes a passenger car (40); Wherein, the multi-energy imaging method further comprises: The multi-spectrum radiation source (10) is used to perform a full-vehicle scan of the bus (40) using the first scanning mode or the third scanning mode, or the multi-spectrum radiation source (10) is not used to perform a full-vehicle scan of the bus (40).

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