Liquid scintillation detection device for imaging system, imaging system and method

Abstract

The present invention discloses a liquid scintillator detection device, imaging system, and method for an imaging system. The liquid scintillator detection device includes a detection unit, a signal acquisition unit, and a plurality of infusion tubes matching the number of the detection subunits. The detection unit includes a plurality of detection subunits fixed side by side, each having a tubular structure and a first opening and a second opening, and is filled with liquid scintillator. The signal acquisition unit includes a circuit board sealed to the first opening of the detection subunit and a plurality of silicon photomultiplier tubes matching the number and position of the detection subunits. The infusion tube is a pipe extending outward in a tapered manner from the second opening. The present invention can minimize light loss and avoid the problem of liquid scintillator leakage caused by the thermal expansion and contraction effect of the liquid scintillator.

Description

Technical Field

[0001] The present invention belongs to the field of ray detection, in particular to the field of cosmic ray detection, and more specifically to a liquid scintillator detection device for an imaging system, an imaging system and a method. Background Art

[0002] A radiation detector is a device used to detect high-energy particles. It primarily consists of a scintillator, optoelectronic devices, readout electronics, and an image reconstruction module, with the scintillator being an essential component. The detection process for a radiation detector involves radiation particles entering the detector's scintillator. The incident particles then deposit energy in the detector through effects such as ionization and excitation, emitting visible fluorescence. The detector then uses optoelectronic devices to convert the visible fluorescence into some form of analog electrical signal. The analog signal is then converted into an easily manipulated digital signal through readout electronics. Finally, the processed digital signal is sent to the image reconstruction module for pre-processing, reconstruction, and post-processing to ultimately form an image.

[0003] Traditional X-ray detectors use two types of scintillators: plastic and liquid. Liquid scintillators are the cheapest. Therefore, large-scale physics experiments typically employ liquid scintillators as light-generating devices, using optoelectronic devices to comprehensively collect the light signals generated by the liquid scintillator. However, traditional X-ray detectors using liquid scintillators present several problems: 1. The thermal expansion and contraction of liquid scintillators can easily lead to leakage; 2. The liquid scintillator and optoelectronic conversion device are separate components, requiring the transmission of light signals through a transparent plate, resulting in a certain amount of light loss; 3. A liquid scintillator detector generates a signal to record the cumulative effect of radiation deposition, but it cannot directly generate images. Summary of the Invention

[0004] In response to the above-mentioned shortcomings in the prior art, the present invention provides a liquid scintillator detection device, imaging system, and method for an imaging system, which can minimize light loss and avoid leakage of the liquid scintillator caused by thermal expansion and contraction.

[0005] In a first aspect, the present invention provides a liquid scintillation detection device for an imaging system, comprising:

[0006] A detection unit, comprising a plurality of detection subunits fixed side by side, wherein the detection subunits are tubular structures and are provided with a first opening and a second opening, and the detection subunits are filled with liquid scintillator;

[0007] a signal acquisition unit, comprising a circuit board sealedly connected to the first opening of the detection subunit and a plurality of silicon photomultiplier tubes whose number and positions match those of the detection subunits;

[0008] A plurality of infusion pipes are provided, the number of which matches the number of the detection subunits, and the infusion pipes are pipelines formed by gradually extending outward from the second opening.

[0009] Wherein, the filling tube is provided with a cylindrical opening, and a detachable plugging head is provided at the cylindrical opening, and the plugging head is used to seal the cylindrical opening.

[0010] Wherein, a plurality of the detection sub-units are fixed side by side, adjacent detection sub-units are closely packed and in contact, and all the first openings are located in the same plane.

[0011] Wherein, all the detection sub-units are located in the same plane, and the center points of the densely packed contact surfaces of two adjacent detection sub-units are in a centrosymmetric relationship.

[0012] The detection unit and the silicon photomultiplier tube are fixed on one side of the circuit board, and circuit components and leads connected to the silicon photomultiplier tube are provided on the other side of the circuit board;

[0013] The silicon photomultiplier tube of the signal acquisition unit passes through the first opening, is disposed in the detection subunit, and contacts the liquid scintillator in the detection unit.

[0014] In a second aspect, the present invention provides an imaging system comprising at least four groups of the above-mentioned liquid scintillation detection devices, wherein each group of the liquid scintillation detection devices comprises two closely stacked liquid scintillation detection devices, and the detection subunits in the two liquid scintillation detection devices are perpendicular to each other;

[0015] During imaging, all the liquid scintillation detection devices are stacked and arranged on both sides of the object to be imaged, and at least two groups of the liquid scintillation detection devices are arranged on each side of the object to be imaged.

[0016] In which, when the system is imaging, at least two groups of liquid scintillator detection devices arranged on one side of the object to be imaged are used to detect cosmic rays passing through the detection subunits, obtain the first position points where the cosmic rays pass through each group of liquid scintillator detection devices, and obtain the paths of cosmic ray incidence based on the multiple first position points; at least two groups of liquid scintillator detection devices arranged on the other side of the object to be imaged are used to detect cosmic rays passing through the detection subunits, obtain the second position points where the cosmic rays pass through each group of liquid scintillator detection devices, and obtain the paths of cosmic ray emission based on the multiple second position points.

[0017] In a third aspect, the present invention further provides a method for performing imaging using the above system, comprising:

[0018] At least two sets of liquid scintillation detection devices are arranged on both sides of the object to be imaged;

[0019] The signal acquisition unit of the liquid scintillator detection device collects the light signal when the cosmic ray passes through;

[0020] According to the acquisition results of the signal acquisition unit, it is determined that there are detection subunits in each liquid scintillator detection device through which cosmic rays pass;

[0021] Reconstruct the path of the cosmic ray based on the detection subunits through which the cosmic ray passes;

[0022] Based on the path of cosmic rays, the atomic numbers of different positions of the object to be imaged can be inferred when the cosmic rays pass through them.

[0023] Depending on the detection subunits that the cosmic rays pass through and the atomic numbers at different positions, images of the object with different colors are obtained.

[0024] The path of the cosmic ray includes the path of the cosmic ray incidence and the path of the cosmic ray exit, and the reconstructing the path of the cosmic ray based on the detection subunits through which the cosmic ray passes includes:

[0025] obtaining a first position point on the plane where each group of liquid scintillator detection devices is located when the cosmic ray incident on the object passes through the detection subunits of the liquid scintillator detection device on the side of the object to be imaged, and obtaining the path of the cosmic ray incident based on the multiple first position points;

[0026] According to the detection subunits of the liquid scintillator detection device on the other side of the object to be imaged when the cosmic ray is emitted, the second position points on the plane where the cosmic ray passes through each group of liquid scintillator detection devices when the cosmic ray is emitted are obtained, and the path of the cosmic ray emission is obtained according to multiple second position points.

[0027] The method of inferring the atomic numbers of different positions of the object to be imaged when the cosmic rays pass through the object based on the cosmic ray paths includes:

[0028] The scattering angle and scattering position of cosmic rays are obtained according to the path of cosmic ray incidence and the path of cosmic ray emission;

[0029] The radiation length of the cosmic ray at the scattering position is obtained according to the scattering angle of the cosmic ray;

[0030] Based on the cosmic ray radiation length at the scattering position, the atomic number of the cosmic ray at different positions of the object to be imaged can be inferred.

[0031] Compared to existing technologies, the present invention reduces light loss during optical signal transmission by placing the silicon photomultiplier tube in direct contact with the liquid scintillator. Furthermore, because the detection unit and the silicon photomultiplier tube are integrated into a single package, an intelligent detector is formed. Furthermore, the infusion tube provides space for the liquid scintillator to expand and contract due to heat, thereby preventing leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an illustrative and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0033] Figure 1 is a schematic structural diagram illustrating a liquid scintillation detection device for an imaging system according to an embodiment of the present invention;

[0034] Figure 2 This is a partial schematic diagram of a liquid scintillation detection device according to an embodiment of the present invention. Figure 1 ;

[0035] Figure 3 This is a partial schematic diagram of a liquid scintillation detection device according to an embodiment of the present invention. Figure 2 ;

[0036] Figure 4 is a partial schematic diagram showing a liquid scintillation detection device according to an embodiment of the present invention when viewed from above;

[0037] Figure 5 is a partial cross-sectional schematic diagram showing a liquid scintillation detection device according to an embodiment of the present invention when viewed from above;

[0038] Figure 6 is a schematic diagram illustrating an imaging system according to an embodiment of the present invention;

[0039] Figure 7 FIG. 4 is a flow chart illustrating a method for performing imaging according to an embodiment of the present invention.

[0040] Explanation of the accompanying reference numerals: 1-detection unit, 11-detection subunit, 12-liquid scintillator, 2-signal acquisition unit, 21-silicon photomultiplier tube, 22-circuit board, 23-lead, 3-infusion tube, 31-sealing head, 100-liquid scintillator detection device, 200-object to be imaged. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only some, not all, of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0042] The terms used in the embodiments of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The singular forms "a," "an," "the," and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, and unless the context clearly indicates otherwise, "a plurality" generally includes at least two.

[0043] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or device. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or device comprising the element.

[0044] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] See also Figures 1 to 5 As shown, an embodiment of the present invention provides a liquid scintillation detection device for an imaging system, which may include a detection unit 1, a signal acquisition unit 2, and a plurality of injection tubes 3;

[0046] like Figure 1-3 ,as well as Figure 5 As shown, the detection unit 1 of this embodiment may include multiple side-by-side fixed detection subunits 11, each filled with liquid scintillator 12. To improve the resolution of the liquid scintillator detection device during imaging, this embodiment minimizes the size of the detection subunits 11 while still meeting detection requirements. In this embodiment, the cross-sectional width of the detection subunits 11 is less than 1.5 cm; preferably, the width of the detection subunits 11 is less than or equal to 1 cm.

[0047] In order to encapsulate the detector subunit 11 and the signal acquisition unit 2, a first opening is provided on the detector subunit 11 in this embodiment. Furthermore, to improve the sealing performance of the detector subunit 11 and the signal acquisition unit 2 during packaging, all first openings are located in the same plane when multiple detector subunits 11 are fixed side by side. Furthermore, to avoid gaps between adjacent detector subunits 11, which could result in missed detection of radiation (cosmic rays), adjacent detector subunits 11 can be closely spaced and contacted when multiple detector subunits 11 are fixed side by side, achieving a seamless arrangement as much as possible. This structure enables the liquid scintillator detection device of this embodiment to achieve better imaging results.

[0048] like Figure 5As shown, all detection subunits 11 of this embodiment are located in the same plane, and the center points of the contact surfaces of two adjacent closely spaced detection subunits are centrosymmetrical. This ensures that the thickness of the detection unit 1 is consistent at all locations, thereby ensuring the same detection results at all locations of the detection unit 1. Furthermore, the detection subunits 11 of this embodiment are tubular structures, and the cross-section of the detection subunits 11 can be triangular, rectangular, or circular, etc., to achieve a seamless shape when the subunits are fixed side by side.

[0049] The detection subunit 11 of this embodiment is provided with a second opening, which serves as an inlet for filling the liquid scintillator 12. Since the detection unit 1 of the present invention is required to be relatively small, the first opening and the second opening can be located at both ends of the detection subunit 11, respectively. This allows the detection unit 1 and the signal acquisition unit 2 to be sealed, and the liquid scintillator 12 to be filled into the detection unit 1, to be filled within a limited space.

[0050] The signal acquisition unit 2 of this embodiment of the present invention includes a plurality of silicon photomultiplier tubes 21 whose number and position match those of the detection subunit 11, and a circuit board 22. The signal acquisition unit 2 is sealedly connected to the first opening of the detection subunit 11 via the circuit board 22. All silicon photomultiplier tubes 21 of the signal acquisition unit 2 are arranged on the same side of the circuit board 22, and the circuit board 22 and the first opening of the detection subunit 11 are sealed using ultraviolet light-curing adhesive. In practical applications, the sealing material of this embodiment can be other materials compatible with the liquid scintillator 12, such as epoxy adhesive. When sealing the circuit board 22 and the first opening of the detection subunit 11 of this embodiment, the silicon photomultiplier tubes 21 located on one side of the circuit board 22 need to be passed through the first opening and positioned within the detection subunit 11, so that the silicon photomultiplier tubes 21 are in direct contact with the liquid scintillator 12 within the detection subunit 11, thereby avoiding light loss caused by the need to use a transparent plate to transmit light signals. In this embodiment, a silicon photomultiplier tube 21 and a detection unit 1 are fixed on one side of the circuit board 22, and circuit components and leads connected to the silicon photomultiplier tube 21 are provided on the other side of the circuit board 22, so that the silicon photomultiplier tube 21 can be powered. The leads are led out through the circuit and connected to the electronics.

[0051] like Figure 1 、 Figure 3 and Figure 4As shown, the number of the filling tubes 3 and the detection sub-units 11 in the embodiment of the present invention matches, and the filling tubes 3 are pipes formed by extending outward in a tapered manner from the second opening. This structural arrangement can allow the bubbles in the detection sub-unit 11 to be converged and discharged through the tapered structure when the liquid scintillator 12 is filled. In addition, a cylindrical opening is provided on the side of the filling tube 3 away from the second opening, and a detachable plugging head 31 is provided at the cylindrical opening. The provision of the cylindrical opening facilitates the sealing of the filling tube 3 by the plugging head 31. In addition, the plugging head 31 of this embodiment can select different structures to seal the cylindrical opening according to actual needs. In an application scenario, the plugging head 31 of this embodiment can be a truncated cone structure, the minimum diameter of which is smaller than the cylindrical opening, and the maximum diameter is larger than the cylindrical opening, so that the plugging head 31 can be partially inserted into the cylindrical opening for sealing. In another application scenario, the plugging head 31 of this embodiment can be an end cap structure, with a protrusion provided on the outside of the cylindrical opening that cooperates with the end cap structure. When using this end cap structure to seal the cylindrical opening, the end cap structure and the protrusion are matched so that the end cap structure is snapped onto the cylindrical opening, thereby completing the sealing of the cylindrical opening. Furthermore, in this embodiment, all the plugging heads 31 used to seal the cylindrical openings of multiple detection sub-units 11 can be a one-piece structure. Therefore, after the liquid scintillator 12 is completely filled into the detection sub-units 11 in this embodiment, the sealing of all cylindrical openings can be completed directly.

[0052] When assembling the liquid scintillation detection device according to the embodiment of the present invention, the following steps may be employed:

[0053] Fixing multiple detection sub-units 11 side by side to form a liquid scintillation detector frame container;

[0054] The circuit board 22 on which the silicon photomultiplier tube 21 is mounted is sealed and bonded to the liquid scintillation detector frame container;

[0055] Place the liquid scintillation detector frame container and the signal acquisition unit 2 bonded together vertically so that the second opening is on top;

[0056] Fill the liquid scintillator 12 into each detection sub-unit 11 in sequence through the second opening;

[0057] After the filling is completed, the second openings of all the detection sub-units 11 are sealed by the plugging heads 31 .

[0058] See also Figure 6 As shown, an embodiment of the present invention provides an imaging system, comprising at least four groups of the above-mentioned liquid scintillation detection devices 100, electronics, and an image reconstruction module, wherein each group of liquid scintillation detection devices 100 comprises two tightly stacked liquid scintillation detection devices 100, and the detection subunits in the two stacked liquid scintillation detection devices 100 are perpendicular to each other;

[0059] During imaging, all liquid scintillation detection devices 100 are stacked and arranged on both sides of the object 200 to be imaged, and at least two groups of liquid scintillation detection devices 100 are arranged on each side of the object 200 to be imaged.

[0060] In an actual imaging scenario, the imaging system of this embodiment is configured such that at least two groups of liquid scintillator detection devices 100 arranged on one side of the object to be imaged 200 are used to detect cosmic rays passing through the detection subunits, obtain the first position points where the cosmic rays pass through each group of liquid scintillator detection devices 100, and obtain the path of the cosmic rays incident based on the multiple first position points; and at least two groups of liquid scintillator detection devices 100 arranged on the other side of the object to be imaged 200 are used to detect cosmic rays passing through the detection subunits, obtain the second position points where the cosmic rays pass through each group of liquid scintillator detection devices 100, and obtain the path of the cosmic rays exit based on the multiple second position points.

[0061] See also Figure 7 As shown, the present invention also provides a method for imaging using the above system, comprising:

[0062] At least two groups of liquid scintillation detection devices 100 are arranged on both sides of the object 200 to be imaged;

[0063] The signal acquisition unit 2 of the liquid scintillator detection device 100 collects light signals when cosmic rays pass through; wherein the cosmic rays can be cosmic rays existing in nature, preferably, muons;

[0064] The electronics obtains the acquisition results of the signal acquisition unit 2 and determines whether there is a detection sub-unit 11 in each liquid scintillator detection device 100 through which cosmic rays pass. The principle of determining which detection sub-unit 11 the cosmic rays pass is as follows: the liquid scintillator in the detection sub-unit 11 generates a light signal when the cosmic ray passes through. The light signal is received by the silicon photomultiplier tube 21 in contact with the liquid scintillator to generate an electrical signal and send it to the electronics. When the electronics receives the corresponding electrical signal, it can determine the detection sub-unit 11 in the liquid scintillator detection device 100 that generates the electrical signal.

[0065] The electronics reconstructs the path of the cosmic ray based on the detection subunit 11 through which the cosmic ray passes; wherein the path of the cosmic ray includes the angle and position information of the cosmic ray incident, and the angle and position information of the cosmic ray exit;

[0066] Based on the path of the cosmic ray, the atomic numbers of different positions of the object to be imaged 200 where the cosmic ray passes are inferred;

[0067] The image reconstruction module obtains an object image with different colors according to the detection subunits 11 through which the cosmic rays pass and the atomic numbers at different positions, wherein different atomic numbers correspond to different colors.

[0068] The path of cosmic rays includes the path of cosmic ray incidence and the path of cosmic ray emission. This embodiment reconstructs the path of cosmic rays based on the detection subunit 11 through which the cosmic rays pass, including:

[0069] Based on the detection subunits 11 of the liquid scintillator detection device 100 passing through one side of the object 200 to be imaged when the cosmic ray is incident, two detection subunits 11 in each group of liquid scintillator detection devices 100 through which the cosmic ray passes are obtained. The point where the two detection subunits 11 intersect is the first position point on the plane where the group of liquid scintillator detection devices 100 is located. Based on the multiple first position points, the path of the cosmic ray incidence (the angle and position information of the cosmic ray incidence) is obtained;

[0070] According to the detection sub-units 11 of the liquid scintillator detection device 100 on the other side of the object to be imaged 200 when the cosmic rays are emitted, two detection sub-units 11 through which the cosmic rays pass are obtained in each group of liquid scintillator detection devices 100. The point where the two detection sub-units 11 intersect is the second position point on the plane where the group of liquid scintillator detection devices 100 is located. Based on multiple second position points, the path of the cosmic ray emission (the angle and position information of the cosmic ray emission) is obtained.

[0071] Among them, since each group of liquid scintillator detection devices 100 includes two liquid scintillator detection devices 100 with detection sub-units 11 perpendicular to each other, and the two liquid scintillator detection devices 100 are stacked in parallel, the two detection sub-units 11 in the group of liquid scintillator detection devices 100 through which the cosmic rays pass belong to the two liquid scintillator detection devices respectively, so that the two detection sub-units 11 through which the cosmic rays pass intersect at one point, which is the first position point or the second position point in this embodiment.

[0072] This embodiment infers the atomic numbers of different positions of the object to be imaged 200 as the cosmic rays pass through them based on the paths of the cosmic rays, which may include the following steps:

[0073] The scattering angle and scattering position of the cosmic ray are obtained according to the path of the cosmic ray incident and the path of the cosmic ray outgoing. The scattering position is the intersection of the incident ray and the extended outgoing ray of the cosmic ray. The scattering position can be obtained by using the nearest point method. (For example Figure 6 As shown, s is the scattering position and θ is the scattering angle)

[0074] The cosmic ray radiation length at the scattering position is obtained according to the scattering angle of the cosmic ray. The radiation length satisfies the following formula:

[0075]

[0076] Where θ RMS is the scattering angle of the cosmic ray, p is the momentum of the cosmic ray, β is the speed of the cosmic ray, c is the speed of light, L is the track length of the cosmic ray, L ris the radiation length; where the track length of the cosmic ray is the thickness of the object to be imaged;

[0077] Based on the radiation length of the cosmic ray, the atomic number of the cosmic ray at different positions of the object to be imaged 200 is inferred. The atomic number satisfies the following formula:

[0078]

[0079] Where A is the mass number of the atom and Z is the atomic number.

[0080] The above introduces the preferred embodiments of the present invention, which is intended to make the spirit of the present invention clearer and easier to understand, and is not intended to limit the present invention. Any modifications, replacements, and improvements made within the spirit and principles of the present invention should be included in the scope of protection outlined by the claims attached to the present invention.

Claims

1. A liquid scintillation detection device for an imaging system, characterized in that: include: A detection unit comprising a plurality of detection subunits fixed side by side, each of the detection subunits being a tubular structure and having a first opening and a second opening, wherein the detection subunits are filled with a liquid scintillator; and the cross-sectional width of the detection subunits is less than 1.5 cm; A signal acquisition unit, comprising a circuit board sealedly connected to the first opening of the detection subunit and a plurality of silicon photomultiplier tubes (SPTs) whose number and position match the number of the detection subunits; the detection unit and the SPTs are fixed to one side of the circuit board, and circuit components and leads connected to the SPTs are provided on the other side of the circuit board; the SPTs of the signal acquisition unit pass through the first opening, are disposed within the detection subunit, and are in contact with the liquid scintillator within the detection unit; The circuit board and the first opening of the detection subunit are sealed by ultraviolet curing adhesive; A plurality of infusion pipes are provided, the number of which matches the number of the detection subunits, and the infusion pipes are pipelines formed by gradually extending outward from the second opening.

2. The device according to claim 1, characterized in that The filling tube is provided with a cylindrical opening, and a detachable plugging head is provided at the cylindrical opening, and the plugging head is used to seal the cylindrical opening.

3. The device according to claim 1, wherein: The plurality of detection sub-units are fixed side by side, adjacent detection sub-units are closely packed and in contact, and all the first openings are located in the same plane.

4. The device according to claim 3, characterized in that All the detection sub-units are located in the same plane, and the center points of the densely packed contact surfaces of two adjacent detection sub-units are in a centrosymmetric relationship.

5. An imaging system, characterized in that: Comprising at least four groups of liquid scintillation detection devices according to any one of claims 1 to 4, each group of the liquid scintillation detection devices comprising two closely stacked liquid scintillation detection devices, and the detection subunits in the two liquid scintillation detection devices being perpendicular to each other; During imaging, all the liquid scintillation detection devices are stacked and arranged on both sides of the object to be imaged, and at least two groups of the liquid scintillation detection devices are arranged on each side of the object to be imaged.

6. The system according to claim 5, wherein: During imaging, the system comprises at least two groups of liquid scintillator detection devices arranged on one side of the object to be imaged, for detecting cosmic rays passing through the detection subunits, obtaining first position points where the cosmic rays pass through each group of liquid scintillator detection devices, and obtaining the paths of the cosmic rays incident based on the multiple first position points. At least two groups of liquid scintillator detection devices arranged on the other side of the object to be imaged are used to detect cosmic rays passing through the detection subunits, obtain the second position points where the cosmic rays pass through each group of liquid scintillator detection devices, and obtain the path of cosmic ray emission based on multiple second position points.

7. A method for imaging using the system according to claim 5 or 6, characterized in that: include: At least two sets of liquid scintillation detection devices are arranged on both sides of the object to be imaged; The signal acquisition unit of the liquid scintillator detection device collects the light signal when the cosmic ray passes through; According to the acquisition results of the signal acquisition unit, it is determined that there are detection subunits in each liquid scintillator detection device through which cosmic rays pass; Reconstruct the path of the cosmic ray based on the detection subunits through which the cosmic ray passes; Based on the path of cosmic rays, the atomic numbers of different positions of the object to be imaged can be inferred when the cosmic rays pass through them. Depending on the detection subunits that the cosmic rays pass through and the atomic numbers at different positions, images of the object with different colors are obtained.

8. The method according to claim 7, wherein: The path of the cosmic ray includes the path of the cosmic ray incidence and the path of the cosmic ray exit. The reconstructing the path of the cosmic ray based on the detection subunits through which the cosmic ray passes includes: obtaining a first position point on the plane where each group of liquid scintillator detection devices is located when the cosmic ray incident on the object passes through the detection subunits of the liquid scintillator detection device on the side of the object to be imaged, and obtaining the path of the cosmic ray incident based on the multiple first position points; According to the detection subunits of the liquid scintillator detection device on the other side of the object to be imaged when the cosmic ray is emitted, the second position points on the plane where the cosmic ray passes through each group of liquid scintillator detection devices when the cosmic ray is emitted are obtained, and the path of the cosmic ray emission is obtained according to multiple second position points.

9. The method according to claim 8, wherein: The method of inferring the atomic numbers of different positions of the object to be imaged when the cosmic rays pass through the object based on the path of the cosmic rays includes: The scattering angle and scattering position of the cosmic ray are obtained according to the incident path and the emitted path of the cosmic ray; According to the scattering angle of cosmic rays, the radiation length of cosmic rays at the scattering position is obtained; Based on the cosmic ray radiation length at the scattering position, the atomic number of the cosmic ray at different positions of the object to be imaged can be inferred.

Images