Micro-dose double-view-angle X-ray pedestrian and article synchronous inspection device

Abstract

The utility model relates to the technical field of X-ray inspection, and provides a micro-dose double-view-angle X-ray pedestrian and article synchronous inspection device which comprises an X-ray emitting device, a control device, an X-ray detection device, a safety inspection channel and an image processing and control device. The control device comprises a front collimator, a middle collimator, a rear collimator and a shielding device, the X-ray detection device comprises two groups of detector arrays, and each detector array comprises a plurality of scintillators used for converting X-rays into optical signals and a plurality of photomultipliers used for amplifying and detecting the optical signals. And the plurality of scintillators and the plurality of photomultipliers are arranged in a one-to-one correspondence manner. By means of the technical scheme, the problem that in the prior art, a collimation device of a ray source adopts a single-direction collimation structure, so that image overlapping is prone to occurring under the condition that pedestrians and packages are dense is solved.

Description

Technical Field

[0001] This utility model relates to the field of X-ray inspection technology, specifically to a micro-dose dual-view X-ray synchronous inspection device for pedestrians and objects. Background Technology

[0002] Not only are airports and customs checkpoints in need of body screening equipment, but public places such as subways, government buildings, and commercial buildings also face the demand for security checks. To meet the requirements of civilized, non-invasive, rapid, and widespread detection, existing security technologies mostly employ THz detection, millimeter-wave detection, and X-ray transmission and backscattering techniques. However, X-ray backscattering technology has a long detection time, making it difficult to adapt to the needs of densely populated areas. Therefore, low-dose X-ray transmission scanning technology has become the mainstream development direction in China.

[0003] Existing technology discloses a micro-dose X-ray rapid inspection system for pedestrians and objects. This system uses a single-loop movement channel design, where personnel walk through the channel for security checks. However, the collimation device of the X-ray source in this system uses a single-direction collimation structure, which easily leads to image overlap when pedestrians and packages are densely packed. This image overlap directly affects the accuracy of detection, especially when simultaneously inspecting objects and people, as details in the image may be obscured or confused, potentially resulting in the failure to accurately identify dangerous or prohibited items. Furthermore, the single-view inspection method cannot provide comprehensive information about the object, limiting the system's detection capabilities. Utility Model Content

[0004] This invention proposes a low-dose, dual-view X-ray device for simultaneous inspection of pedestrians and objects. By adding a dual-view detection method and improving the collimation structure, it can effectively reduce image overlap, improve imaging precision and accuracy, meet the needs of simultaneous and efficient inspection of pedestrians and objects, and maintain low-dose radiation to ensure safety.

[0005] The technical solution of this utility model is as follows:

[0006] A micro-dose dual-view X-ray synchronous inspection device for pedestrians and objects includes an X-ray emitting device, a control device, an X-ray detection device, a security inspection channel, and an image processing and control device. The security inspection channel is located between the X-ray emitting device and the X-ray detection device. The X-ray emitting device is equipped with an X-ray source. The control device includes a front collimator, an intermediate collimator, a rear collimator, and a shield for shielding scattered rays. The front collimator is located at the X-ray source outlet. The intermediate collimator is located on the side of the front collimator away from the X-ray source. The rear collimator is located in front of the X-ray detector device. The shield is located around the X-ray detector device. The X-ray detection device includes two sets of detector arrays. The detector arrays include several scintillators for converting X-rays into light signals and several photomultiplier tubes for amplifying and detecting light signals. The scintillators and photomultiplier tubes are arranged in a one-to-one correspondence.

[0007] Furthermore, the X-ray emitting device has a maximum energy of 140 keV.

[0008] Furthermore, the vertical angle of the front collimator is 45 degrees, the horizontal angle of the intermediate collimator is 30 degrees, the intermediate collimator is a slit cone structure with a width of 3-6 mm, the ray direction thickness of the intermediate collimator is 5-8 cm, and the window width of the rear collimator is 1.2 mm.

[0009] Furthermore, the height of both sets of detector arrays is 1.7m to 2.2m, and the two sets of detector arrays are arranged in parallel to each other.

[0010] Furthermore, the security checkpoint includes a traction device, a conveyor belt, and rollers, and is surrounded by stainless steel railings for regulating personnel and luggage.

[0011] Furthermore, the security checkpoint adopts a single-channel circular movement mode, with entrance and exit positions at the front and rear sections of the security checkpoint, respectively. The entrance of the security checkpoint is equipped with a face and identity verification device for verifying the identity of personnel.

[0012] Furthermore, the front collimator is made of lead, and the intermediate collimator is made of stainless steel.

[0013] Furthermore, the scintillator is made of cerium-doped yttrium silicate or cerium-doped yttrium silicate lutetium material, and the photomultiplier tube is a silicon photomultiplier tube.

[0014] The working principle and beneficial effects of this utility model are as follows:

[0015] 1. This invention, by setting up two sets of detector arrays, allows the system to simultaneously acquire X-ray imaging information of the inspected object from different angles. The dual-view design significantly reduces image overlap problems caused by a single view, because in the case of overlapping pedestrians or objects, images from different angles can complement and correct each other, helping to improve the overall detection accuracy.

[0016] 2. This invention provides more precise X-ray beam control through a combination of a front collimator, an intermediate collimator, and a rear collimator. The front and intermediate collimators are used to adjust the direction and divergence angle of the X-ray beam multiple times, ensuring that the X-ray beam covers areas at different angles when passing through the detection channel. The rear collimator further optimizes the angle at which the X-ray enters the detector. This multi-stage collimation device reduces irregular scattering, ensuring that the X-ray reaches the detector accurately and avoiding image overlap and blurring caused by scattered or irregular X-rays. At the same time, the shield prevents scattered X-rays from entering the detector area, avoiding invalid X-rays interfering with image formation, thereby further reducing image overlap and clutter, and ensuring a cleaner signal received by the detector.

[0017] 3. This utility model adopts the "scintillator + photomultiplier tube" mode to count and collect high-speed data of X-rays in energy segments, which can reduce the power of the X-ray source, up to 1 / 5 of the power of X-ray machines in other human security inspection systems, greatly reducing the absorbed dose of human body and objects (the single security inspection time of human body and objects is less than 2 seconds, and the dose is less than 0.05μSv), which is more beneficial to the radiation safety of personnel and surrounding areas. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a side view of the present invention;

[0021] Figure 3 This is a front view of the present utility model;

[0022] Figure 4 This is a schematic diagram of the X-ray coverage area in this utility model.

[0023] In the diagram: 1. X-ray emitting device; 2. X-ray detection device; 3. Security checkpoint; 4. Face and identity verification device; 11. X-ray source; 12. Front collimator; 13. Center collimator; 21. Detector array; 31. Conveyor belt; 51. Shielding device; 131. X-ray slit. Detailed Implementation

[0024] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0025] like Figures 1-4 As shown, this embodiment proposes a micro-dose dual-view X-ray pedestrian and object synchronous inspection device, including an X-ray emitting device 1, a control device, an X-ray detection device 2, a security inspection channel 3, and an image processing and control device. The security inspection channel 3 is located between the X-ray emitting device 1 and the X-ray detection device 2. The X-ray emitting device 1 is equipped with an X-ray source 11. The control device includes a front collimator 12, an intermediate collimator 13, a rear collimator, and a shield 51 for shielding scattered rays. The front collimator 12 is located at the exit of the X-ray source 11, the intermediate collimator 13 is located on the side of the front collimator 12 away from the X-ray source 11, the rear collimator is located in front of the X-ray detector device, and the shield 51 is located around the X-ray detection device 2. The X-ray detection device 2 includes two sets of detector arrays 21. The detector arrays 21 include several scintillators for converting X-rays into light signals and several photomultiplier tubes for amplifying and detecting light signals. The scintillators and photomultiplier tubes are arranged in a one-to-one correspondence.

[0026] X-ray emitting device 1 is used to penetrate pedestrians and objects, providing basic image information. A front collimator 12, located at the exit of the X-ray source 11, limits the emission angle of the rays, reduces unnecessary scattered rays, ensures the beam is concentrated on the inspection area, and improves image quality. An intermediate collimator 13, located on the side of the front collimator 12 away from the X-ray source 11, further adjusts and limits the emission direction and angle of the rays, ensuring precise transmission of the beam in the inspection channel and reducing image blur. A rear collimator, located in front of the X-ray detection device 2, further optimizes the directionality of the rays entering the detector array 21, ensuring the rays are within the receiving range of the detector array 21, preventing irregular rays from entering, and improving image clarity. A shield 51, located around the X-ray detection device 2, shields scattered rays, preventing ray interference with the inspection environment and equipment, protecting operators and the surrounding environment, and reducing interference from unwanted scattered rays. Two sets of detector arrays 21 are used to acquire X-ray imaging information of the inspected object from different angles. The scintillators in detector array 21 convert X-rays into optical signals, rapidly and efficiently converting X-ray image signals into optical signals to ensure detection sensitivity and accuracy. Photomultiplier tubes amplify and detect the optical signals, arranged in a one-to-one correspondence with the scintillators to ensure signal amplification and transmission accuracy, improving the detail and quality of the final image. The security inspection channel 3 is located between the X-ray emitting device 1 and the X-ray detection device 2, guiding pedestrians or objects being inspected through the X-ray beam for rapid inspection. The single-channel design simplifies the operation process and improves inspection efficiency. The image processing and control device reconstructs two sets of images based on data from the two detector arrays 21. Because materials have different attenuation coefficients for X-rays of different energies, images obtained at different energies will have different grayscale distributions. Through a dual-view design, a 3D-like reconstructed image can be obtained, resulting in stronger identification of contraband and faster inspection speed.

[0027] In this embodiment, the X-ray emitting device 1 has a maximum energy of 140 keV, the vertical angle of the front collimator 12 is 45 degrees, the horizontal angle of the intermediate collimator 13 is 30 degrees, the intermediate collimator 13 has a slit cone structure with a width of 3 to 6 mm, the thickness of the intermediate collimator 13 in the ray direction is 5 to 8 cm, and the window width of the rear collimator is 1.2 mm.

[0028] 140 keV X-ray energy falls within the low-to-medium energy range, suitable for transmission-based security inspection of people and objects. Using 140 keV energy not only ensures sufficient penetration and clear imaging but also reduces the radiation dose to the inspected object, meeting the dual requirements of security equipment for safety and detection effectiveness. The 45-degree vertical angle of the front collimator 12 controls the vertical divergence angle of the X-ray beam, ensuring the beam covers a specific vertical range to fully irradiate targets in the detection channel during scanning. This 45-degree vertical angle ensures the beam covers the entire height of people and objects, avoiding blind spots and increasing the detection coverage area, while reducing ineffective beam divergence and thus improving beam utilization. The 30-degree horizontal angle of the intermediate collimator 13 limits the horizontal divergence angle of the beam, precisely controlling the beam propagation path and avoiding unnecessary scattering or excessive divergence. This 30-degree horizontal angle ensures the beam is concentrated within the designated detection area, preventing beam diffusion into irrelevant areas and improving image clarity and accuracy. Furthermore, this also reduces energy loss of the X-rays, allowing more X-rays to be used in the effective imaging process. The slit cone structure of the intermediate collimator 13 is used to further focus the X-rays, forming a narrower beam. This cone slit design helps to concentrate the X-ray beam into a narrow area, thereby improving the directionality and resolution of the beam. At the same time, it can also split the X-rays emitted from the X-ray source 11 into two independent beams, which are emitted from two slits 131 at the emitting end of the X-ray emitting device 1, respectively. These two X-ray beams will be directed toward the detector arrays 21 on both sides after entering the detection channel, and will be sensed by different detector arrays 21. The slit cone design splits the X-ray beam into two beams in the horizontal direction, which can simultaneously cover two independent detection areas, thereby achieving dual-view imaging. This not only improves the imaging coverage, but also enhances the ability to capture details of complex targets (such as human bodies and packages). Through the beam splitting design, the two sets of detector arrays 21 can sense X-rays from different angles, reducing the risk of image overlap, especially in the case of dense pedestrians and objects, thereby improving the accuracy of imaging and overall detection efficiency. The thickness of the intermediate collimator 13 in the direction of the rays determines the path length of the rays within the collimator, which affects the divergence and concentration of the rays. A thickness of 5–8 cm provides sufficient collimation distance for the ray beam, allowing it to focus sufficiently before entering the detection area, thus ensuring the collimation and accuracy of the ray beam. This thickness also helps to reduce unwanted scattered rays, improving imaging accuracy. The rear collimator, located in front of the detector, is used to further filter or control the direction and intensity of the rays entering the detector. A window width of 1.2 mm ensures that only extremely narrow ray beams are allowed to enter the detector, thereby improving detection accuracy. The 1.2 mm width design ensures that only strictly collimated rays can enter the detector, reducing interference from scattered rays.This greatly improves the resolution and accuracy of the detected images, especially when detecting complex objects or the interior of the human body, helping to enhance the ability to distinguish fine objects.

[0029] In this embodiment, both detector arrays 21 are 1.7m to 2.2m high and arranged parallel to each other. The 1.7m to 2.2m height of the detector arrays 21 basically covers the height of most pedestrians, while also accommodating the detection needs of various items (such as packages and suitcases), ensuring that pedestrians and items throughout the detection channel are within the X-ray coverage area, effectively detecting the entire body of pedestrians and their belongings. The parallel arrangement of the two detector arrays 21 ensures that both detectors can simultaneously capture the X-ray signal of the target object from different angles, providing a dual-view imaging effect. This not only improves the comprehensiveness of the imaging but also helps to better identify hidden items or hazardous substances.

[0030] In this embodiment, the security checkpoint 3 includes a traction device, a conveyor belt 31, and rollers. Stainless steel railings are installed around the security checkpoint 3 to regulate personnel and luggage. The security checkpoint 3 adopts a single-channel circulating movement mode. The front and rear sections of the security checkpoint 3 are respectively provided with entrance and exit positions. A face and identity verification device 4 for verifying the identity of personnel is installed at the entrance of the security checkpoint 3.

[0031] A traction device is used to drive the movement of the conveyor belt 31. In this embodiment, the traction device can be an electric motor, which provides stable power to make the conveyor belt 31 move in a cycle, ensuring that the security inspection equipment can work continuously and reliably during long-term operation. The conveyor belt 31 is a strip-shaped transport tool used to move items in a horizontal or inclined direction. In this embodiment, the conveyor belt 31 is responsible for passing luggage or personnel through the X-ray inspection equipment. The conveyor belt 31 can ensure the stability and continuity of personnel or luggage passing through the security checkpoint, reduce stops and manual operations, and improve inspection speed. Rollers are the supporting and rotating components of the conveyor belt 31, located at both ends or below the conveyor belt 31. The rollers are driven to rotate by an electric motor, and the rotation of the rollers drives the conveyor belt 31 to move, enabling the conveyor belt 31 to operate smoothly. The face and identity verification device 4 is used to combine face recognition and identity information verification to ensure the authenticity of the identity of the personnel passing through. Through the face and identity verification device 4, the personnel entering the security checkpoint can be verified in real time, ensuring the security of the security checkpoint and preventing unauthorized personnel from entering.

[0032] In this embodiment, the precollimator 12 is made of lead, a material with very strong X-ray absorption. Lead effectively shields unwanted scattered rays, ensuring that the X-ray beam emitted from the X-ray source is concentrated in the predetermined area, reducing radiation leakage to the surrounding environment, protecting operators and the inspected object, and ensuring image quality. The intermediate collimator 13 is made of stainless steel, which has good mechanical strength, corrosion resistance, and low X-ray absorption, making it suitable as a structural component. The intermediate collimator 13, through its special slit cone structure, further precisely controls the X-ray beam and splits it into two X-ray beams. The strength and durability of stainless steel ensure that the intermediate collimator 13 does not deform or corrode during high-precision X-ray collimation, maintaining stable structural accuracy over a long period. Because stainless steel has low X-ray absorption, unnecessary energy loss is avoided, thereby improving detection efficiency and accuracy. The scintillator is made of cerium-doped yttrium silicate or cerium-doped yttrium lutetium silicate, and the photomultiplier tube is a silicon photomultiplier tube.

[0033] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A micro-dose dual-view X-ray synchronous inspection device for pedestrians and objects, comprising an X-ray emitting device (1), a control device, an X-ray detection device (2), a security inspection channel (3), and an image processing and control device, wherein the security inspection channel (3) is located between the X-ray emitting device (1) and the X-ray detection device (2), characterized in that, The X-ray emitting device (1) is provided with an X-ray source (11). The control device includes a front collimator (12), an intermediate collimator (13), a rear collimator, and a shield (51) for shielding scattered rays. The front collimator (12) is located at the exit of the X-ray source (11). The intermediate collimator (13) is located on the side of the front collimator (12) away from the X-ray source (11). The rear collimator is located in front of the X-ray detector device. The shield (51) is located around the X-ray detector device (2). The X-ray detector device (2) includes two sets of detector arrays (21). The detector arrays (21) include a number of scintillators for converting X-rays into light signals and a number of photomultiplier tubes for amplifying and detecting light signals. The number of scintillators and the number of photomultiplier tubes are arranged in a one-to-one correspondence.

2. The micro-dose dual-view X-ray simultaneous inspection device for pedestrians and objects according to claim 1, characterized in that, The X-ray emitting device (1) has a maximum energy of 140 keV.

3. The micro-dose dual-view X-ray simultaneous inspection device for pedestrians and objects according to claim 1, characterized in that, The vertical angle of the front collimator (12) is 45 degrees, the horizontal angle of the middle collimator (13) is 30 degrees, the middle collimator (13) is a slit cone structure with a width of 3 to 6 mm, the thickness of the middle collimator (13) in the ray direction is 5 to 8 cm, and the window width of the rear collimator is 1.2 mm.

4. The micro-dose dual-view X-ray simultaneous inspection device for pedestrians and objects according to claim 1, characterized in that, The height of both sets of detector arrays (21) is 1.7m to 2.2m, and the two sets of detector arrays (21) are arranged in parallel to each other.

5. The micro-dose dual-view X-ray simultaneous inspection device for pedestrians and objects according to claim 1, characterized in that, The security inspection channel (3) includes a traction device, a conveyor belt (31) and rollers, and stainless steel railings are provided around the security inspection channel (3) to regulate personnel and luggage.

6. The micro-dose dual-view X-ray simultaneous inspection device for pedestrians and objects according to claim 1, characterized in that, The security inspection channel (3) adopts a single-channel circular movement mode. The front and rear sections of the security inspection channel (3) are respectively provided with entrance and exit positions. The entrance of the security inspection channel (3) is provided with a face and identity verification device (4) for verifying and confirming the identity of personnel.

7. The micro-dose dual-view X-ray simultaneous inspection device for pedestrians and objects according to claim 1, characterized in that, The front collimator (12) is made of lead, and the intermediate collimator (13) is made of stainless steel.

8. The micro-dose dual-view X-ray simultaneous inspection device for pedestrians and objects according to claim 1, characterized in that, The scintillator is made of cerium-doped yttrium silicate or cerium-doped lutetium yttrium silicate, and the photomultiplier tube is a silicon photomultiplier tube.

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