Dual imaging detection system and switching method

Abstract

The invention provides a dual-imaging detection system and a switching method, and the system comprises a host which is provided with an accommodation cavity which is recessed inwards and is used for installing a transmission imaging system or a back scattering imaging system, and the bottom of the accommodation cavity is provided with a ray source beam outlet; the transmission imaging system is provided with a protection plate, a conical beam modulation structure and a conical protection structure arranged on the back surface of the protection plate, the conical beam modulation structure is embedded in a space formed by the protection plate and the conical protection structure, and the conical protection structure can be embedded into the accommodating cavity of the host; and the back scattering imaging system is provided with a back scattering detector, a chopping structure and a chopping protection structure arranged on the back surface of the back scattering detector, the chopping structure is embedded in a space formed by the back scattering detector and the chopping protection structure, and the chopping protection structure can be embedded into the accommodating cavity of the host. Through the modular design, the transmission / back scattering system can be interchanged for operation, the problem of single function of traditional equipment is solved, and the dual requirements for transmission / back scattering imaging detection in various narrow spaces are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of radiation imaging technology, in particular to a dual imaging detection system and switching method. BACKGROUND

[0002] X-ray imaging technology is generally divided into transmission imaging technology and backscatter imaging technology.

[0003] Transmission imaging technology is an imaging technology based on photoelectric effect, which has the characteristics of deep detection depth, clear image, high image resolution, etc. CT, DR and CR products derived from the principle of transmission imaging technology are widely used in medical imaging, industrial flaw detection, chip and battery detection, ore selection, food foreign object detection, security check and other fields.

[0004] Backscatter imaging technology is a single-sided imaging detection technology based on X-ray reverse Compton scattering effect, which has the characteristics of organic matter highlighting effect and shallow penetration. It is very suitable for detection of materials composed of low atomic number and high electron density characteristic elements and shallow detection of large targets, such as large objects, wall / ground explosives and eavesdropping devices.

[0005] In recent years, in order to further meet the needs of in-situ detection, handheld / portable transmission and backscatter imaging technology products based on X-ray have emerged. However, in actual detection applications, both handheld backscatter imaging devices and portable transmission imaging devices have many inconveniences, which are difficult to meet the needs of various uses and restrict their popularization and application in various scenarios. Therefore, it is necessary to provide an improved technical solution to overcome the shortcomings of the prior art. SUMMARY

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a dual imaging detection system and switching method, which includes a lightweight backscatter imaging system with low dose leakage and a transmission imaging system, and the host part can be handheld. The implementation method for quickly switching between backscatter imaging and transmission imaging using the host is provided. The imaging device with high imaging resolution can quickly meet the needs of transmission imaging and backscatter imaging detection, thereby solving at least one aspect of the shortcomings of the prior art portable transmission imaging system and handheld backscatter imaging system.

[0007] In a first aspect, the present application provides a dual imaging detection system, comprising:

[0008] a host having an inwardly recessed accommodating cavity for mounting a transmission imaging system or a backscatter imaging system, wherein the accommodating cavity is provided with a ray source beam outlet at the bottom.

[0009] The transmission imaging system has a protective plate, a cone beam modulation structure, and a cone protection structure arranged on the back of the protective plate. The cone beam modulation structure is embedded in the space formed by the protective plate and the cone protection structure. The cone protection structure is embeddable with the accommodating cavity of the main machine.

[0010] The backscattering imaging system has a backscattering detector, a chopping structure, and a chopping protection structure arranged on the back of the backscattering detector. The chopping structure is embedded in the space formed by the backscattering detector and the chopping protection structure. The chopping protection structure is embeddable with the accommodating cavity of the main machine.

[0011] In some embodiments, the main machine includes a frame and an accommodating cavity recessed inward from the middle of the frame. The accommodating cavity is arranged as a prism structure composed of several trapezoidal conical surface-shaped partitions. The partitions include a first partition, a second partition, a third partition, and a fourth partition connected in sequence. The first partition and the third partition are symmetrically arranged, and the second partition and the fourth partition are symmetrically arranged.

[0012] In some embodiments, the partitions are arranged on the beam exit port of the ray source of the main machine and extend to the edge of the shell of the main machine. The surfaces of the first partition and the third partition are each provided with a positioning pin to position the transmission imaging system or the backscattering imaging system.

[0013] In some embodiments, the cone beam modulation structure of the transmission imaging system modulates the cone beam emitted by the X-ray source into a cone beam of (60°-70°) x (25°-45°).

[0014] In some embodiments, the cone protection structure is provided with two transmission positioning grooves, and the positioning pins of the partitions are embeddable in the transmission positioning grooves.

[0015] In some embodiments, a lead plate is embedded inside the protective plate, and the thickness of the lead plate is between 0.4mm and 0.6mm.

[0016] In some embodiments, the transmission imaging system and the backscattering imaging system further include a camera assembly and a light supplement lamp group. The camera assembly is used for on-site shooting of evidence, and the light supplement lamp group is used for shooting light supplement.

[0017] The transmission imaging system further includes an outline lamp group fixed to the periphery of the beam exit port of the cone beam modulation structure, which is used to indicate the irradiation range of the cone beam.

[0018] In some embodiments, the cone beam entrance of the backscattering imaging system is embedded inside the chopping protection structure and flush with the bottom surface of the chopping protection structure, the other surface of the chopping protection structure is embedded in the back surface of the backscattering detector; the side surface of the chopping protection structure is respectively provided with two backscattering positioning grooves, which can be coupled with the positioning pins of the main machine, so that the cone beam entrance is embedded with the beam exit of the ray source.

[0019] In some embodiments, the main machine further comprises a display screen group located directly above the main machine, for providing a human-computer interaction interface and receiving and displaying a three-dimensional image of the surface of the measured target object.

[0020] In a second aspect, the application provides a switching method of a dual imaging detection system, which selects and configures a transmission imaging system or a backscattering imaging system according to actual needs, switches the equipment system to a backscattering imaging mode when the system detects that the backscattering detector is configured, and switches the equipment system to a transmission imaging mode when the system detects that the backscattering detector does not exist.

[0021] Compared with the prior art, the dual imaging detection system and the switching method provided by the application have the following beneficial effects:

[0022] The technical scheme provided by the application realizes dual-mode integration through modular design, and the transmission / backscattering system can be operated interchangeably, solves the problem of single function of the traditional equipment, has the advantages of light weight, handheld operation, low dose, high imaging resolution and the like, meets the dual needs of transmission imaging and backscattering imaging detection in a narrow space, and can quickly realize target backscattering imaging detection and transmission imaging detection. In addition, the integration design of the accommodation cavity of the main machine and the beam exit of the ray source is compatible with the transmission imaging system and the backscattering imaging system, ensures that the two modes share the same main machine platform, reduces redundant cost, and facilitates technical iteration and market promotion. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure schematic diagram of the main machine provided by the application is shown in the figure;

[0024] Figure 2 The structure schematic diagram of the transmission imaging system provided by the application is shown in the figure;

[0025] Figure 3 The assembly structure schematic diagram of the transmission imaging system and the main machine provided by the application is shown in the figure;

[0026] Figure 4 The radiation field distribution diagram in the working mode of the transmission imaging system is shown in the figure;

[0027] Figure 5Penetration effect diagram of 40mm steel plate in working mode of the transmission imaging system;

[0028] Figure 6 Imaging resolution test diagram in working mode of the transmission imaging system;

[0029] Figure 7 Structural schematic diagram of the backscattering imaging system provided in the present application;

[0030] Figure 8 Structural schematic diagram of the assembly of the backscattering imaging system provided in the present application and the host computer.

[0031] Explanation of reference numerals:

[0032] 100, host computer; 110, ray source beam outlet; 120, frame body; 130, partition plate; 131, first partition plate; 132, second partition plate; 133, third partition plate; 134, fourth partition plate; 140, positioning peg; 150, hand-held part; 160, display screen group; 170, cable inlet and outlet;

[0033] 200, transmission imaging system; 210, protection plate; 220, cone-shaped beam modulation structure; 230, cone-shaped protection structure; 240, transmission positioning slot;

[0034] 300, backscattering imaging system; 310, backscattering detector; 320, chopping structure; 330, chopping protection structure; 340, cone-shaped beam inlet; 350, backscattering positioning slot;

[0035] 410, camera assembly; 420, light supplement lamp group; 430, outline lamp group. DETAILED DESCRIPTION

[0036] As disclosed in the background art, in recent years, in order to further adapt to the needs of in-situ detection, X-ray-based handheld / portable transmission and backscattering imaging technology products have been developed, but in actual detection applications, the handheld backscattering imaging device alone has the following obvious disadvantages, which are specifically manifested as:

[0037] (1) Poor penetration ability, which can only meet the use demand of penetrating less than 12mm of stainless steel under 140kV; even the transmission imaging scheme of handheld backscattering imaging instrument + FPD, the limit penetration is not less than 26mm, and the image resolution is not less than 2lp / mm;

[0038] (2) Insufficient resolution, such as the low resolution of 2mm spatial resolution and 0.15mm wire resolution in the prior art, which cannot provide more accurate visual detection effect.

[0039] In addition, the portable transmission EOD detection scheme usually adopts a portable X-ray machine + FPD flat panel detector to realize the transmission imaging of the measured target. This imaging mode also has the following disadvantages in actual use: although the technology is mature, the transmission depth is deep, for example, 140kV can penetrate 40mm of stainless steel, but the device is large in size, heavy in weight and high in power, up to hundreds of watts or thousands of watts, radiation protection is difficult, which is not conducive to the imaging arrangement in narrow space and has large radiation leakage, thereby greatly increasing the risk of radiation exposure of on-site workers and regional mobile personnel.

[0040] Recently, some companies have launched a handheld transmission device different from the dental film machine. The device adopts an appearance similar to that of the backscatter imaging instrument, and uses the ray source of the handheld backscatter imaging instrument. The difference is that the chopper system and the backscatter detector of the original handheld backscatter imaging instrument are removed, the FOV of the handheld backscatter ray source is adjusted, and a protective plate with FOV area indication is added. However, the device only has transmission imaging function and cannot realize the dual detection requirements of backscattering and transmission. Moreover, the cost is high and not suitable for market promotion.

[0041] Based on the disadvantages of the prior art, the present application provides a dual imaging detection system and switching method. The advantages and principles of the present application can be easily understood by those skilled in the art from the content disclosed in the specification. The present application can also be implemented or applied in different specific embodiments, and various modifications or changes can be made to the details in the specification without departing from the spirit of the present application.

[0042] As described in the embodiments of the present application, the cross-sectional view of the device structure is partially enlarged without general proportion for convenience of description, and the schematic diagram is only an example which should not limit the scope of protection of the present application. In addition, three-dimensional spatial dimensions including length, width and depth should be included in actual production.

[0043] Here, expressions such as "between" can mean including both end values, and expressions such as "multiple" can mean two or more, unless otherwise explicitly specified. In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features.

[0044] Embodiment one:

[0045] As Figures 1-8As shown, this embodiment provides a dual imaging detection system, including a host 100. The host 100 can be configured with a transmission imaging system 200 or a backscatter imaging system 300 according to actual needs, so as to integrate the transmission imaging and backscatter imaging functions into a single handheld device, thereby solving the problem of single function of traditional portable devices.

[0046] See also Figure 1 The host 100 mainly includes an integrated radiation source, a control circuit, a display screen group 160, a battery pack, a partition 130, a handheld host housing, and control buttons. Among them, the battery pack is used to provide the energy required for the operation of the entire device. In this embodiment, a lithium battery pack is preferably used, specifically a polymer lithium battery with a capacity of no more than 99mAh. Among them, the integrated radiation source is fixed in the handheld host. The high voltage of the radiation source is adjustable in the range of 50kV to 160kV, and the tube current is adjustable from 10uA to 100uA. The cone beam modulation structure 220 modulates the X-ray beam into a cone-shaped beam output angle of (60° to 70°) × (25° to 45°). Among them, the control circuit includes but is not limited to the radiation source drive control circuit, the camera component drive control circuit, the power supply charge and discharge management and subsystem power distribution circuit, the WIFI & Bluetooth module, the FPGA + ARM processor circuit, etc., which are not detailed here. The main unit housing is used to assemble the various components of the device, supporting the entire handheld device. It also provides a handle for the operator to hold, along with control buttons for triggering the X-ray beam and an emergency stop button. The housing is constructed from ABS or other engineering plastics to ensure both lightweight and high strength. The handheld unit 150 is located on either side of the main unit 100, close to the operator. Its structure and position are adjusted for ease of use.

[0047] Continue to see Figure 1 The host 100 includes a frame 120 and a housing cavity concave inward from the middle of the frame 120 for installing the transmission imaging system 200 or the backscatter imaging system 300. A ray source beam outlet 110 is provided at the bottom of the housing cavity.

[0048] Continue to see Figure 1In an optional embodiment, the accommodating cavity is provided as a prism structure composed of several trapezoidal conical surface-shaped partitions 130, which are arranged on the ray source beam outlet 110 of the main machine 100 and extend to the edge of the shell of the main machine 100, forming a physical barrier, which can protect the internal electronic devices when switching between backscattering and transmission modes. The partition 130 includes a first partition 131, a second partition 132, a third partition 133 and a fourth partition 134 connected in sequence along the side, wherein the first partition 131 and the third partition 133 are symmetrically arranged, and the second partition 132 and the fourth partition 134 are symmetrically arranged. Further, the partition 130 is made of a material with low density and high strength, such as carbon fiber plate, for protecting the circuit board and other electronic devices inside the main machine 100. The prism partition structure made of carbon fiber material not only ensures the mechanical strength but also reduces the weight, and the trapezoidal conical surface design can maximize the utilization of internal space. Further, a cable access port 170 is provided on one of the partitions for the cable connecting the main machine 100 and the electronic devices on the protective plate 210 or the chopping structure 320 to pass through smoothly. Specifically, the cable access port 170 is provided on the second partition 132 in the upper region of the partition 130, i.e., in the upper part of the whole machine, to facilitate wiring. Further, the cable access port 170 can be provided with an EMI shielding ring to suppress radio frequency interference.

[0049] Continuing to refer to Figure 1 In an optional embodiment, the surfaces of the first partition 131 and the third partition 133 are provided with positioning pins 140 for coupling with other modules, so that the ray beam can smoothly pass through the transmission or backscattering sub-module structure, i.e., the positioning pins 140 can position the transmission imaging system 200 or the backscattering imaging system 300. Specifically, the positioning pins 140 are connected with the conical protection structure 230 of the transmission imaging system 200, which is provided with two transmission positioning grooves 240, and the positioning pins 140 of the partition 130 can be embedded in the transmission positioning grooves 240. The positioning pins 140 are connected with the chopping protection structure 330 of the backscattering imaging system 300, which is provided with two backscattering positioning grooves 350 on the side surface, which can be coupled with the positioning pins 140 of the main machine 100 to make the conical beam inlet 340 fit with the ray source beam outlet 110.

[0050] Continuing to refer to Figure 1 In an optional embodiment, the display screen group 160 is located above the shell of the main machine 100, which is used to provide a human-computer interaction interface and receive and display the stereoscopic images of the surface of the measured target object. Specifically, it displays the backscattering and transmission images of the measured target object transmitted back to the hand-held main machine end from the transmission imaging system 200 and the backscattering imaging system 300, and the display screen displays the dual-mode images in real time to support on-site quick decision-making.

[0051] Referring toFigures 2 to 6 The transmission imaging system 200 has a protective plate 210, a cone beam modulation structure 220, and a cone protection structure 230 arranged at the back of the protective plate 210. The cone beam modulation structure 220 is a general structure in the existing transmission imaging technology, which is not described herein. The cone beam modulation structure 220 is embedded in the space formed by the protective plate 210 and the cone protection structure 230. Specifically, the ray entrance of the cone beam modulation structure 220 is embedded in the bottom surface of the cone protection structure 230 and is fixed by a screw. The other surface of the cone beam modulation structure 220 is embedded in the surface of the protective plate 210 and is fixed by a screw, preventing the cone beam modulation structure 220 from shaking and protecting the structure from being damaged by collision.

[0052] In an optional embodiment, the cone protection structure 230 can be embedded in the accommodating cavity of the main machine 100. The cone protection structure 230 is provided with two transmission positioning grooves 240, and the positioning pins 140 of the partition plate 130 can be embedded in the transmission positioning grooves 240. The coupling mechanism of the positioning pins 140 and the transmission positioning grooves 240 realizes “foolproof” replacement of the module, without the need for calibration, preventing imaging distortion or radiation leakage caused by incorrect installation. The cone beam modulation structure 220 of the transmission imaging system 200 modulates the cone beam emitted by the X-ray source into a cone beam of (60°-70°) x (25°-45°), so as to optimize the radiation field distribution and balance the penetration depth and resolution. Further, the protective plate 210 and the cone beam modulation structure 220 are made of high-atomic-number alloy materials such as Cu and Pb, which are used to absorb scattered X-rays in transmission applications and reduce the radiation exposure of the operator. The material of the cone protection structure 230 is preferentially selected from materials with low density and high strength, such as carbon fiber. The material of the cone beam modulation structure 220 is preferentially selected from high-density metal materials, such as tungsten, lead, or tungsten rubber, which are used to modulate the cone beam emitted by the X-ray source into a cone beam of 70° x 35°.

[0053] In an optional embodiment, the transmission imaging system 200 further includes a camera assembly 410, a light supplement lamp group 420, and a contour lamp group 430. The camera assembly 410 is arranged at an upper position of the protective plate 210 and is used for on-site shooting of evidence. The light supplement lamp group 420 is also arranged at the upper position of the protective plate 210 and can be arranged adjacent to the camera assembly 410, and is used for shooting light supplement. The contour lamp group 430 is fixed around the beam exit of the cone beam modulation structure 220, as shown in FIG. 4. Figure 3, for indicating the irradiation range of the cone beam, further, the outline lamp set 430 includes four outline lamps, each of which is symmetrically arranged at the periphery of the beam exit port to provide accurate contour positioning. The lead plate with a thickness of 0.4mm-0.6mm is embedded in the inside of the protective plate 210 to reduce the influence of scattered radiation of air or other objects in front of the system on the operator. Further, the thickness of the lead plate is 0.5mm, which can more effectively absorb scattered radiation and reduce the radiation dose at the operating position to a safe threshold. The size of the protective plate 210 can be selected but is not limited to 40cmx25cm, which is adjusted according to the size of the human torso. According to the simulation results, the radiation field distribution at the operating position in the transmission mode is as shown in Figure 5 , there is an ultra-low radiation area in the radiation field behind the system, and the area is comparable to the area of the protective plate.

[0054] Referring to Figure 7 and Figure 8 , the backscatter imaging system 300 has a backscatter detector 310, a chopping structure 320, and a chopping protection structure 330 arranged on the back of the backscatter detector 310. The chopping structure 320 is embedded in the space formed by the backscatter detector 310 and the chopping protection structure 330, and the chopping protection structure 330 can be fitted into the accommodating cavity of the main machine 100. The material of the chopping protection structure 330 is preferably low-density and high-strength carbon fiber material. The chopping structure 320 is a general structure in the existing backscatter imaging technology, which will not be described here.

[0055] In an optional embodiment, the cone beam entrance 340 of the backscatter imaging system 300 is embedded in the inside of the chopping protection structure 330 and flush with the bottom surface of the chopping protection structure 330, and the other surface of the chopping protection structure 330 is embedded in the back of the backscatter detector 310. The side surface of the chopping protection structure 330 is respectively provided with two backscatter positioning grooves 350, which can be coupled with the positioning pins 140 of the main machine 100 to make the cone beam entrance 340 fit with the beam exit port 110 of the ray source. The cone beam entrance 340 is the first entrance of the cone beam emitted by the ray source. The cone beam enters the chopping structure 320 through the cone beam entrance 340, forms a pen-shaped beam after passing through the chopping structure 320, and is emitted from the beam exit port of the chopping structure 320 to irradiate the surface of the object.

[0056] In an optional embodiment, the camera assembly 410 is located at the front end of the backscatter detector 310, which can be used for visible light forensics and also record the shooting process to correct the backscatter image through video images; the light supplement lamp group 420 is located beside the camera assembly 410, which is used to supplement light for shooting in weak light or dark detection conditions; the outline lamp group 430 is parallelly arranged with two, which are located at the front end of the backscatter detector 310 and are respectively located on both sides of the camera assembly 410, which are used to help the operator to master the imaging area covered by the rays in the backscatter imaging scanning process in real time, and the angle of the two laser beams emitted by the two outline lamps can be observed to correct the holding angle of the operator to the handheld backscatter imager in time.

[0057] Embodiment two:

[0058] The embodiment provides a switching method of a dual imaging detection system, which selects and configures a transmission imaging system 200 or a backscatter imaging system 300 according to actual needs, switches through hardware detection and a software system, switches to a communication protocol of the backscatter detector 310 when the system detects that the backscatter detector 310 is configured, switches the equipment to a backscatter imaging mode, switches the equipment to a transmission imaging mode when the system detects that the backscatter detector 310 does not exist. The software mode is automatically switched through preset software detection, manual intervention errors are reduced, and a plug-and-play workflow is realized.

[0059] Specifically, the protection plate 210 in the transmission imaging system 200 can switch the system from the backscatter imaging mode to the transmission imaging mode. The protection plate 210 and the internal cone beam modulation structure 220 are covered by a plastic part to form a prism structure, the bottom surface of the prism is a cone beam entrance surface, the entrance surface can be embedded into a beam exit surface of a ray source, at the same time, the side surface of the prism is parallelly installed with the above-mentioned trapezoidal partition plate 130, the transmission positioning groove 240 of the side surface is embedded into the positioning pin 140 of the trapezoidal protection plate, and after the entrance surface is combined with the ray source, the plastic part is fixed through buckling and the shell. The area of the protection plate 210 affects the radiation field distribution of the operation position, the difference between the radiation safety area and the protection plate area is very small through physical simulation, and the protection area should reach the size of the area of the human body trunk. The cone beam modulation structure 220 is used for modulating the X-ray beam into a cone beam with an angle range of 60°-70°*25°-45°, and the simulation shows that the scattering noise is lowest. The laser outline lamp for indicating the imaging / detection area is further arranged on the protection plate 210, which is used for indicating / prompting the operator the imaging detection range. In an optional embodiment, two transmission positioning grooves 240 are opened on the side surface of the cone protection structure 230, the positioning pin 140 on the partition plate 130 is embedded into the transmission positioning groove 240 when the transmission sub-module is assembled, the laser lamp and the camera group cable are connected into the equipment through the cable inlet and outlet 170, the cone beam entrance surface of the transmission sub-module is combined with the beam exit port 110 of the host computer 100, and the transmission imaging mode is formed.

[0060] Specifically, the chopper structure 320 and the backscatter detector 310 can switch the system from the transmission imaging mode to the backscatter imaging mode. The chopper structure 320 and the backscatter detector 310 structure are covered by a plastic part to form a prism structure, the bottom surface of the prism is a chopper surface of the cone beam beam entrance, the chopper surface can be embedded into the beam exit surface of the ray source, at the same time, the side surface of the prism is installed in parallel with the above-mentioned trapezoidal partition plate 130, the backscatter positioning groove 350 of the side surface is embedded into the positioning pin 140 of the trapezoidal partition plate, after the chopper structure surface is embedded into the ray source, the plastic part is fixed by buckling and the shell. The detector structure is provided with a laser profile lamp for the imaging / detection area, which is used to indicate / prompt the operator the imaging detection range; the backscatter imaging mode needs to replace the transmission sub-module with the detector and the chopper sub-module. The system is automatically switched to the backscatter imaging mode by automatically detecting the presence of the detector by software. The detector and the chopper module are like Figure 4 The beam exit structure of the chopper structure 320 is locked on the back surface of the backscatter detector 310 by a screw, the beam exit of the chopper structure 320 is embedded into the beam exit of the backscatter detector 310 synchronously, which prevents the chopper structure 320 and the backscatter detector 310 from being misaligned, thereby causing the ray beam to fail to pass through the system smoothly, and making the equipment unable to form a backscatter image normally. The cone beam entrance 340 is the first entrance of the cone beam emitted by the ray source, the cone beam enters the chopper structure 320 through the cone beam entrance 340, forms a pen-shaped beam after being emitted from the beam exit of the chopper structure 320, and irradiates the surface of the object. The cone beam entrance 340 is embedded into the inside of the chopper protection structure 330 and is flush with the bottom surface of the chopper protection structure 330, the other surface of the chopper protection structure 330 is embedded into the back surface of the backscatter detector 310 and is fastened by a screw. The side surface of the chopper protection structure 330 has two backscatter positioning grooves 350, when the detector chopper module is assembled, the backscatter positioning grooves 350 are coupled with the positioning pins 140 of the main machine 100, so as to ensure that the cone beam entrance 340 can be completely embedded into the cone beam exit, and prevent radiation leakage. The material of the chopper protection structure 330 is preferentially selected to be carbon fiber material with low density and high strength. The backscatter detector 310 is provided with a visible light camera, which is used for on-site evidence collection by the operator, and is provided with a fill light, so that the operator can collect evidence and take pictures in the case of dark environment.

[0061] The above-mentioned switching manual operation process can be optimized according to the actual use process, and the following basic operation process is provided: long press the emergency stop button of the main machine to cut off the high voltage of the ray source; release the chopper of the transmission module, pull out the module along the axis of the positioning pin 140; embed the backscatter positioning groove 350 of the backscatter module into the positioning pin 140, and hear the "click" sound to indicate mechanical locking; the system automatically detects the 1mA pull-up current of the backscatter detector 310, and the interface is switched to the backscatter mode icon.

[0062] In summary, the dual imaging detection system and switching method provided by this application have the following beneficial effects:

[0063] 1. Dual-mode integrated design: The innovative integration of transmission imaging and backscatter imaging into a single handheld device solves the single-function problem of traditional portable devices. By replacing the transmission protection plate or backscatter detector module, the imaging mode can be quickly switched without additional complex operations, adapting to different inspection scenarios (such as security inspection and industrial flaw detection);

[0064] 2. Lightweight and optimized portability: The main unit is made of high-strength, low-density materials such as carbon fiber, combined with a miniaturized radiation source (high voltage 50-160kV, tube current 10-100μA) and a compact battery (≤99mAh), significantly reducing the weight and volume of the device and improving its ease of operation in confined spaces. The radiation shield design (Cu / Pb alloy) is combined with a cone-beam modulation structure (tungsten, aluminum, etc.) to reduce radiation leakage while maintaining the device's lightness.

[0065] 3. Intelligent mode switching and safety improvement: The software automatically detects the detector status (whether the backscatter detector is present or not), switches the imaging mode in real time, and simplifies the operation process. Radiation field simulation optimizes the size of the protective plate (40cm×25cm) to ensure that tissues and organs susceptible to radiation damage are within the safe zone, reducing the risk of exposure to operators.

[0066] 4. Enhanced imaging performance: The transmission mode supports penetration of 40mm stainless steel at 140kV, with a spatial resolution of 3lp / mm, which is superior to traditional handheld backscatter + FPD solutions (penetration <26mm). The backscatter mode retains the highlighting effect of organic matter and is suitable for shallow layer detection (such as explosives and eavesdropping devices). It also integrates laser marker lights and a fill light camera to improve environmental adaptability.

[0067] 5. Cost Control and Compatibility: Dual-mode functionality is achieved by reusing core hardware (radiation source, display, and control circuitry), reducing overall system costs. Compatibility with existing handheld backscatter imager structures facilitates technological iteration and market adoption. Therefore, this application effectively overcomes the shortcomings of existing technologies and possesses high industrial value.

[0068] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. A dual imaging detection system, characterized in that: include: The host (100) has an inwardly recessed accommodating cavity for installing a transmission imaging system (200) or a backscatter imaging system (300), and a ray source beam outlet (110) is provided at the bottom of the accommodating cavity; A transmission imaging system (200) comprises a protective plate (210), a cone-shaped beam modulation structure (220), and a cone-shaped protective structure (230) arranged on the back of the protective plate (210); the cone-shaped beam modulation structure (220) is embedded in a space formed by the protective plate (210) and the cone-shaped protective structure (230); and the cone-shaped protective structure (230) is engageable with a receiving cavity of the host (100); A backscatter imaging system (300) comprises a backscatter detector (310), a chopping structure (320), and a chopping protection structure (330) arranged on the back of the backscatter detector (310); the chopping structure (320) is embedded in a space formed by the backscatter detector (310) and the chopping protection structure (330); and the chopping protection structure (330) is engageable with a receiving cavity of the host (100).

2. The dual imaging detection system according to claim 1, characterized in that: The host (100) includes a frame (120) and a accommodating cavity that is concave inward from the middle of the frame (120), and the accommodating cavity is configured as a prism structure composed of a plurality of partitions (130) with trapezoidal conical surfaces; the partitions (130) include a first partition (131), a second partition (132), a third partition (133), and a fourth partition (134) whose sides are connected in sequence, wherein the first partition (131) and the third partition (133) are symmetrically arranged, and the second partition (132) and the fourth partition (134) are symmetrically arranged.

3. The dual imaging detection system according to claim 2, characterized in that: The partition (130) is arranged on the radiation source beam outlet (110) of the host (100) and extends to the edge of the housing of the host (100), wherein the surfaces of the first partition (131) and the third partition (133) are both provided with positioning pins to position the transmission imaging system (200) or the backscatter imaging system (300).

4. The dual imaging detection system according to claim 1, characterized in that: The cone beam modulation structure (220) of the transmission imaging system (200) modulates the cone beam emitted by the X-ray source into a cone beam of (60° to 70°)×(25° to 45°).

5. The dual imaging detection system according to claim 3, characterized in that: The conical protective structure (230) is provided with two transmission positioning grooves (240), and the positioning pins (140) of the partition (130) can be embedded in the transmission positioning grooves (240).

6. The dual imaging detection system according to claim 2, characterized in that: A lead plate is embedded in the protective plate (210), and the thickness of the lead plate is between 0.4 mm and 0.6 mm.

7. The dual imaging detection system according to claim 1, characterized in that: The transmission imaging system (200) and the backscatter imaging system (300) further include a camera assembly (410) and a fill light group (420), wherein the camera assembly (410) is used for on-site photography and evidence collection, and the fill light group (420) is used for photography and fill light. The transmission imaging system (200) further comprises a position light assembly (430), wherein the position light assembly (430) is fixed around the beam outlet of the cone beam modulation structure (220) and is used to indicate the irradiation range of the cone beam.

8. The dual imaging detection system according to claim 5, characterized in that: The cone beam inlet (340) of the backscatter imaging system (300) is embedded in the interior of the chopping protection structure (330) and is flush with the bottom surface of the chopping protection structure (330); the other side of the chopping protection structure (330) is embedded in the back of the backscatter detector (310); two backscatter positioning grooves (350) are respectively provided on the side surfaces of the chopping protection structure (330); the backscatter positioning grooves (350) can be coupled with the positioning pins (140) of the host (100) to enable the cone beam inlet (340) to be embedded with the ray source beam outlet (110).

9. The dual imaging detection system according to claim 1, characterized in that: The host (100) further comprises a display screen group (160), which is located directly above the host (100) and is used to provide a human-computer interaction interface and receive and display a stereoscopic image of the surface of the target object being measured.

10. A switching method for a dual imaging detection system, characterized in that: A transmission imaging system (200) or a backscatter imaging system (300) is selected and configured according to actual needs. When the system detects that a backscatter detector (310) is configured, the device system switches to a backscatter imaging mode. When the system detects that the backscatter detector (310) does not exist, the device system switches to a transmission imaging mode.

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