CN117969570A - Detection system - Google Patents

Abstract

The application relates to the technical field of detection, and provides a detection system which comprises a scanner and an X-ray source, wherein the scanner comprises an annular shell, the annular shell is provided with a back scattering window and a transmission window which are arranged at intervals along the circumferential direction, at least part of the X-ray source is positioned in the annular shell, and the X-ray source and the scanner can rotate relatively so as to enable ray beams to respectively pass through the back scattering window and the transmission window, thereby realizing back scattering and transmission integrated imaging, and improving the accuracy of the detection system.

Description

Detection system

Technical Field

The application relates to the technical field of detection, in particular to a detection system.

Background

The X-ray imaging technology can carry out analysis imaging according to imaging factors such as density distribution, effective atomic number distribution and the like of a detected object, and can be used for detecting prohibited articles such as explosives, firearms and the like.

X-ray imaging comprises back-scattering imaging and transmission imaging, and two independent detection systems are generally required to be adopted for back-scattering imaging and transmission imaging respectively, so that the problem of low detection precision exists.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a detection system, which can improve the accuracy of the detection system.

An embodiment of the present application provides a detection system including:

A scanner including an annular housing formed with a back-scattering window and a transmission window disposed at intervals in a circumferential direction;

An X-ray source, at least part of which is located within the annular housing, the X-ray source and the scanner being rotatable relative to each other to pass a beam of radiation through the backscatter window and the transmission window, respectively.

In some embodiments, the detection system includes a motor, the scanner includes a base, the annular housing is coupled to the base, and the motor is drivingly coupled to the base to drive the scanner in rotation.

In some embodiments, the detection system includes a shielding box coupled to the annular housing to collectively define a receiving cavity within which the X-ray source is disposed.

In some embodiments, the shielding case and the annular case are spliced relatively to form the accommodating chamber, one of an end face of the shielding case facing the annular case and an end face of the annular case facing the shielding case is formed with a groove, and the other of an end face of the shielding case facing the annular case and an end face of the annular case facing the shielding case is formed with a flange, the flange being accommodated in the groove.

In some embodiments, the detection system includes a collimator disposed within the receiving cavity, the beam of the X-ray source being collimated by the collimator and exiting the backscatter window and the transmission window.

In some embodiments, the number of the back scattering windows is a plurality, and the plurality of the back scattering windows are arranged at intervals along the circumferential direction of the annular shell.

In some embodiments, the number of the back scattering windows is an even number, and the even number of the back scattering windows is symmetrical in pairs in the radial direction.

In some embodiments, the number of the transmission windows is plural, and the plural transmission windows are arranged at intervals along the circumferential direction of the annular shell.

In some embodiments, the number of the transmission windows is an even number, and the even number of the transmission windows is symmetrical in pairs along the radial direction.

In some embodiments, the number of the back scattering windows is plural, and plural back scattering windows and plural transmission windows are alternately arranged at intervals in the circumferential direction.

In some embodiments, the axis of the beam of radiation from the X-ray source is perpendicular to the axis of rotation of the scanner.

In the detection system provided by the embodiment of the application, since the back scattering window and the transmission window are arranged at intervals along the circumferential direction of the annular shell, the ray beam can respectively pass through the back scattering window and the transmission window in the relative rotation process of the X-ray source and the scanner; in the case where the beam passes through the back-scattering window, back-scattering imaging can be performed; with the beam passing through the transmission window, transmission imaging can be performed; thus, integrated imaging of back scattering and transmission can be realized through the annular shell, so that the accuracy of the detection system is improved.

Drawings

FIG. 1 is a schematic diagram of a portion of a detection system according to some embodiments of the present application, with broken lines representing X-ray beams;

FIG. 2 is a schematic view of the structure of an annular shell according to some embodiments of the present application;

FIG. 3 is a schematic diagram of backscatter detection of some embodiments of the present application, where the broken line represents an X-ray beam;

FIG. 4 is a schematic illustration of transmission detection of some embodiments of the application, with the broken lines representing X-ray beams;

FIG. 5 is a schematic diagram of a scanner and shield can connection according to some embodiments of the present application;

FIG. 6 is a schematic view of the structure of an annular shell according to other embodiments of the present application;

FIG. 7 is a schematic diagram of a probing cycle according to some embodiments of the present application;

fig. 8 is a schematic diagram of a detection system according to some embodiments of the application.

Description of the reference numerals

A detection system 100; a scanner 10; a housing chamber 10a; an annular shell 11; a back-scattering window 11a; a transmission window 11b; a first opening 11c; a flange 111; a base 12; a transmission rod 13; an X-ray source 20; a motor 30; a shield case 40; a groove 40a; a collimator 50; a backscatter detector 60; a transmission detector 70; a processor 80.

Detailed Description

Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the application but are not intended to limit the scope of the application.

The various features and embodiments described in the detailed description may be combined in any suitable manner, for example, different embodiments may be formed by different combinations of features/embodiments, where not contradictory, and various possible combinations of features/embodiments in the present application are not described further in order to avoid unnecessary repetition.

The present application provides a detection system 100, referring to fig. 1 to 4, comprising a scanner 10 and an X-ray source 20, the scanner 10 comprising an annular housing 11, the annular housing 11 being formed with a back-scattering window 11a and a transmission window 11b arranged at intervals in a circumferential direction, at least part of the X-ray source 20 being located within the annular housing 11, the X-ray source 20 and the scanner 10 being rotatable relative to each other such that a radiation beam passes through the back-scattering window 11a and the transmission window 11b, respectively.

The X-ray source 20 is adapted to emit an X-ray beam. The back-scatter window 11a is used to emit a beam of radiation to achieve back-scatter imaging. The transmission window 11b is used to transmit the radiation beam for transmission imaging. The back scattering imaging can acquire density distribution information of the detection object so as to distinguish inorganic matters from organic matters, and can further distinguish conventional organic matters, drugs, trinitrotoluene (Trinitrotoluene, TNT) and the like, and the transmission imaging can acquire effective atomic number distribution information of the detection object so as to distinguish various matters and clearly image.

In the detection system 100 provided by the embodiment of the application, since the back scattering window 11a and the transmission window 11b are arranged at intervals along the circumferential direction of the annular shell 11, the ray beams can respectively pass through the back scattering window 11a and the transmission window 11b in the relative rotation process of the X-ray source 20 and the scanner 10; in the case where the ray beam passes through the back-scattering window 11a, back-scattering imaging can be performed; in the case where the radiation beam passes through the transmission window 11b, transmission imaging can be performed; in this manner, integrated back-scattering and transmission imaging may be achieved by the annular housing 11, thereby improving the accuracy of the detection system 100.

The X-ray source 20 and the scanner 10 are capable of relative rotation, and in some embodiments, it may be that the X-ray source 20 rotates and the scanner 10 remains stationary. In other embodiments, it may be that the X-ray source 20 remains stationary and the scanner 10 rotates.

In some embodiments, referring to fig. 1, the detection system 100 includes a motor 30, the scanner 10 includes a base 12, an annular housing 11 is connected to the base 12, and the motor 30 is in driving connection with the base 12 to rotate the scanner 10. The motor 30 drives the scanner 10 to rotate and the X-ray source 20 remains stationary. The base 12 can enhance the stability of the scanner 10, and is connected with the motor 30 through the base 12, and the power of the motor 30 is transmitted to the annular shell 11 through the base 12.

For example, referring to fig. 1, the scanner 10 includes a transmission rod 13, where the transmission rod 13 is disposed on the base 12, and a projection of the transmission rod 13 along an axial direction coincides with an axis of the annular housing 11. That is, the transmission rod 13 and the annular housing 11 are coaxial, so that the balance of the annular housing 11 during rotation can be maintained. Further, the driving end of the motor 30 is connected to the driving rod 13 and provides a stable power source, so that the annular housing 11 is stably rotated. The motor 30 may drive the scanner 10 to rotate a plurality of times to increase the number of times the beam passes through the back-scattering window 11a and the transmission window 11b, thereby increasing the number of times the scanner 10 detects the detection object and improving the accuracy of the detection system 100.

It should be noted that, in the embodiment of the present application, the number of times refers to two or more times.

In some embodiments, referring to fig. 1, the detection system 100 includes a shielding box 40, the shielding box 40 being connected to the annular housing 11 to collectively define a receiving cavity 10a, and the x-ray source 20 being disposed within the receiving cavity 10 a. In this way, on the one hand, the X-ray source 20 is disposed in the housing chamber 10a, so that the damage caused by the radiation of the X-ray source 20 can be reduced, and on the other hand, the adsorption of impurities such as dust on the X-ray source 20 can be reduced.

The shielding case 40 is not limited to a material, and may be tungsten, for example, which has a high density and atomic number, and can absorb the beam of the X-ray source 20 to reduce the radiation of the detection system 100.

In some embodiments, referring to fig. 1, the shielding case 40 and the annular case 11 are spliced opposite to each other to form the accommodating cavity 10a, one of an end surface of the shielding case 40 facing the annular case 11 and an end surface of the annular case 11 facing the shielding case 40 is formed with a groove 40a, the other of the end surface of the shielding case 40 facing the annular case 11 and the end surface of the annular case 11 facing the shielding case 40 is formed with a flange 111, and the flange 111 is accommodated in the groove 40 a. For example, referring to fig. 5, the annular housing 11 is formed with a first opening 11c in an axial direction, and the shielding case 40 closes the first opening 11c in an axial direction to be spliced with the annular housing 11 in an opposite axial direction to form the accommodating chamber 10a. The groove 40a has a positioning and limiting function on the flange 111, so that stability in the rotation process of the annular shell 11 can be enhanced.

In one embodiment, referring to fig. 5, an annular flange 111 is formed on an end surface of the annular housing 11 facing the shielding case 40, an annular groove 40a is formed on an end surface of the shielding case 40 facing the annular housing 11, and the flange 111 and the groove 40a cooperate to facilitate assembling and disassembling of the annular housing 11 and the shielding case 40.

In some embodiments, referring to fig. 3 and 4, the detection system 100 includes a collimator 50, where the collimator 50 is disposed in the accommodating chamber 10a, and the beam of the X-ray source 20 is collimated by the collimator 50 and then exits the back-scattering window 11a and the transmission window 11b. The collimator 50 is used for shaping the beam from the X-ray source 20, and adjusting the exit angle of the beam, so that the beam can completely irradiate the detection object, thereby improving the detection accuracy and quality of the scanner 10.

In some embodiments, referring to fig. 2 to 4, the number of the back scattering windows 11a is plural, and the back scattering windows 11a are spaced apart along the circumference of the annular shell 11. That is, after the annular housing 11 rotates one turn, the radiation beam sequentially irradiates the detection object through the plurality of back scattering windows 11a, thereby increasing the number of back scattering detections and improving the accuracy of the detection system 100.

It should be noted that, in the embodiments of the present application, the number includes two or more.

In some embodiments, referring to fig. 2 to 4, the number of the back scattering windows 11a is an even number, and the even number of the back scattering windows 11a are symmetrical in pairs along the radial direction. Specifically, two symmetrically disposed backscatter windows 11a constitute a pair of backscatter window groups, and an even number of backscatter windows 11a may constitute at least one group of backscatter window groups.

For example, referring to fig. 2, a set of back scattering windows, i.e. two back scattering windows 11a, are symmetrically distributed about the rotation axis of the annular housing 11, so that the overall structure of the annular housing 11 is optimized, and centrifugal forces at symmetrical positions of the annular housing 11 are equal during rotation, thereby canceling each other, and enhancing the stability of the scanner 10.

In some embodiments, referring to fig. 2 to 4, the number of the transmission windows 11b is plural, and the plural transmission windows 11b are arranged at intervals along the circumferential direction of the annular housing 11. That is, after the annular housing 11 rotates one turn, the radiation beam sequentially irradiates the detection object through the plurality of transmission windows 11b, thereby increasing the number of transmission detections, thereby improving the accuracy of the detection system 100.

In some embodiments, referring to fig. 2 to 4, the number of the transmission windows 11b is an even number, and the even number of the transmission windows 11b are symmetrical in pairs along the radial direction. Specifically, two symmetrically arranged transmission windows 11b constitute a pair of transmission window groups, and an even number of transmission windows 11b may constitute at least one transmission window group.

For example, referring to fig. 2, a group of transmission windows, i.e., two transmission windows 11b, are symmetrically distributed about the rotation axis of the annular housing 11, so that the overall structure of the annular housing 11 is optimized, and centrifugal forces at opposite positions of the annular housing 11 are equal during rotation, thereby canceling each other, and enhancing the stability of the scanner 10.

In some embodiments, referring to fig. 2 to 4, the number of the back scattering windows 11a is plural, and the plurality of back scattering windows 11a and the plurality of transmission windows 11b are alternately arranged at intervals in the circumferential direction. In this way, alternating back-scatter imaging and transmission imaging is facilitated.

For example, referring to fig. 6, the annular housing 11 is provided with two transmission windows 11b and four back-scattering windows 11a, and the transmission windows 11b and the back-scattering windows 11a are symmetrical in pairs in the circumferential direction. Thus, when the annular housing 11 is rotated once, the scanner 10 completes the transmission irradiation twice and the back-scattering irradiation four times on the detection object, thereby improving the detection performance of the scanner 10.

In other embodiments, referring to table 1, the number of photons per pixel is increased by increasing the number of back-scattering windows 11a, so as to adapt to different requirements of the detection environment.

TABLE 1

In the related art, the axial direction of the ray beam of the X-ray source is parallel to the rotation axis of the scanner, and the size and shape of the exit window of the ray beam need to be adjusted according to the projection shape of the ray beam on the scanner, so that part of the exit window is prevented from not passing through the ray beam, and the part of the detection object is prevented from being irradiated by the ray beam.

In some embodiments, the axis of the beam of radiation from the X-ray source 20 is perpendicular to the axis of rotation of the scanner 10. The design is not needed to adjust the size and shape of the emergent window according to the projection shape of the ray beam like the related technology. Therefore, the size and shape of the back-scattering window 11a and the transmission window 11b, which are easy to be formed, can be adopted, simplifying the manufacturing process of the scanner 10. Illustratively, the back-scattering window 11a may be a regular hole and the transmissive window 11b may be an elongated slit, thus facilitating the shaping of the annular housing 11.

Illustratively, the projection of the ray bundle onto the annular shell 11 has a length H in the axial direction, and the annular shell 11 has a length H in the axial direction, wherein H is equal to or greater than H. In this way, the beam always passes completely through the back-scattering window 11a and the transmission window 11b, ensuring the detection quality of the scanner 10.

In some embodiments, the projection of the beam onto the annular shell 11 has a length L in the circumferential direction, and the back-scattering window 11a and the transmission window 11b have a spacing S in the circumferential direction, where L.ltoreq.S.

Specifically, referring to fig. 7, taking the case where the annular housing 11 has two back-scattering windows 11a and two transmission windows 11b as an example, taking l=s, when the beam completely leaves the back-scattering windows 11a, it starts to pass through the transmission windows 11b; when the beam completely leaves the transmission window 11b, it starts to pass through the back-scattering window 11a. In this way, the back scattering period and the transmission period are independent of each other, so that interference is avoided, and in addition, the back scattering period and the transmission period are cyclically reciprocated, so that the ray bundle is continuously irradiated on the detection object in the detection process of the detection object, and the continuity of detection by the scanner 10 is realized.

The back scattering window 11a is referred to as a back scattering period from the start of the cut-in ray beam to the complete exit of the cut-in ray beam, and the transmission window 11b is referred to as a transmission period from the start of the cut-in ray beam to the complete exit of the cut-in ray beam. In fig. 7, t ₁ is represented as a transmission period, t ₂ is represented as a back-scattering period, and t is represented as a detection period.

In some embodiments, referring to FIG. 8, detection system 100 includes a backscatter detector 60, a transmission detector 70, and a processor 80. Wherein the backscatter detector 60 is configured to receive a backscatter signal generated upon irradiation of the detection object by the radiation beam, and the processor 80 processes the backscatter signal and generates a backscatter image. The transmission detector 70 is used for receiving transmission signals generated after the radiation beam irradiates the detection object, and the processor 80 processes the transmission signals and generates a transmission image. The back-scattered image and the transmission image may be displayed after being combined or separately displayed for viewing by an operator.

Specifically, referring to fig. 3 and 8, the radiation beam irradiates on the detection object to generate compton scattering, and generates a lateral back scattering signal, and the back scattering detector 60 collects the lateral back scattering signal, and the processor 80 performs back scattering imaging on the lateral back scattering signal to obtain lateral density distribution information. At the same time, the detection object moves in the first direction, the beam irradiates and generates longitudinal back-scattered signals, the back-scattered signals are collected by the back-scattered detector 60, and the processor 80 performs back-scattered imaging on the longitudinal back-scattered signals to acquire longitudinal density distribution information. Further, based on the lateral density distribution information and the longitudinal density distribution information, a density distribution map of the detection object can be obtained.

Specifically, referring to fig. 4 and 8, the radiation beam irradiates the object to be inspected and generates a transverse transmission signal, which is collected by the transmission detector 70, and is subjected to transmission imaging by the processor 80 to obtain transverse effective atomic distribution ordinal information. Simultaneously, the detection object moves along the first direction, the ray beam irradiates and generates a longitudinal transmission signal, the transmission detector 70 collects the longitudinal transmission signal, and the processor 80 performs transmission imaging on the longitudinal transmission signal to acquire longitudinal effective atomic distribution ordinal number information. Further, based on the transverse effective atomic distribution ordinal information and the longitudinal effective atomic distribution ordinal information, an effective atomic number distribution map of the detection object can be obtained.

Further, by detecting the density profile and the effective atomic number profile of the object, an image of the object can be drawn.

The X-ray source 20 may be a Mox140G Fan Beam type X-ray source 20 with a maximum exit energy of 140keV to enhance the back-scattered and transmitted signals. The backscatter detector 60 may employ a intensifying screen, a substrate PET, and the scintillator may be Gd2O2S: pr to enhance the ability to receive backscatter signals. The material of the transmission detector 70 may be cesium iodide (CsI) to improve sensitivity to light signals.

In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "an embodiment," and "exemplary" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

The various embodiments/implementations provided by the application may be combined with one another without contradiction. The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (11)

1. A detection system, comprising:

A scanner including an annular housing formed with a back-scattering window and a transmission window disposed at intervals in a circumferential direction;

An X-ray source, at least part of which is located within the annular housing, the X-ray source and the scanner being rotatable relative to each other to pass a beam of radiation through the backscatter window and the transmission window, respectively.

2. The detection system of claim 1, wherein the detection system comprises a motor, the scanner comprises a base, the annular housing is coupled to the base, and the motor is drivingly coupled to the base to drive the scanner in rotation.

3. The detection system of claim 1, comprising a shielding box coupled to the annular housing to collectively define a receiving cavity, the X-ray source disposed within the receiving cavity.

4. A detection system according to claim 3, wherein the shield case and the annular case are spliced relatively to form the accommodation chamber, one of an end face of the shield case facing the annular case and an end face of the annular case facing the shield case being formed with a groove, the other of an end face of the shield case facing the annular case and an end face of the annular case facing the shield case being formed with a flange, the flange being accommodated in the groove.

5. A detection system according to claim 3, characterized in that the detection system comprises a collimator arranged in the receiving chamber, the radiation beam of the X-ray source being collimated by the collimator and exiting the back-scattering window and the transmission window.

6. The detection system of claim 1, wherein the number of backscatter windows is a plurality, the plurality of backscatter windows being spaced circumferentially along the annular shell.

7. The detection system of claim 6, wherein the number of the back-scattering windows is an even number, and the even number of the back-scattering windows are symmetrical in pairs in the radial direction.

8. The detection system of claim 1, wherein the number of transmission windows is a plurality, the plurality of transmission windows being spaced apart along the circumference of the annular housing.

9. The detection system of claim 8, wherein the number of the transmission windows is an even number, and the even number of the transmission windows are symmetrical in pairs in the radial direction.

10. The detection system according to claim 8, wherein the number of the back-scattering windows is plural, and a plurality of the back-scattering windows and a plurality of the transmission windows are alternately arranged at intervals in the circumferential direction.

11. The detection system according to any one of claims 1 to 10, wherein an axis of a beam of radiation from the X-ray source is perpendicular to a rotational axis of the scanner.