CT Scanning Imaging System

Abstract

The present invention relates to the field of CT scanning equipment manufacturing, and discloses a CT scanning imaging system, which mainly includes a carrying platform, a scanning device, a data processing center and a control center. The scanning device is arranged on the periphery of the carrying platform through a rotating device, and the scanning device includes two or more scanning units, and the scanning unit includes a ray source and a detector plate arranged corresponding to the ray source, and the detector plate includes one or more plate units; under the control of the control center, the rotating device drives the scanning device to move around the object to be scanned placed on the carrying platform, and the scanning device collects the scanning data of the object to be scanned and outputs the data signal to the data processing center, and generates a multi-angle two-dimensional image and establishes a three-dimensional tomographic image after being processed by the data processing center. The present invention can obtain a larger scanning field of view and a faster scanning speed, has a compact structure, and has high working efficiency and accuracy.

Description

Technical Field

[0001] The present invention relates to the field of CT scanning equipment manufacturing, in particular to a CT scanning imaging system. Background Art

[0002] Computer tomography technology based on X-ray radiation imaging, referred to as "CT technology", can obtain the characteristic distribution data of the scanned material in the section through CT data reconstruction, and can realize the identification of the object to be detected by analyzing the characteristic data. CT scanning technology has been widely used in the medical field due to its high sensitivity and accuracy. With the widespread application of this technology, in addition to the medical field, it has also begun to be used for security inspections in public places in recent years, such as: identifying common suspicious substances in luggage. In the existing security inspection equipment, not only is the number of scanning devices set up small, but the detector board in each scanning device is set in a single way, resulting in problems such as slow scanning speed and limited scanning range. Therefore, in the field of luggage security inspection, improving the scanning speed of the security inspection machine, reducing the equipment footprint, and especially the size of the equipment's detection range are all key factors that affect the large-scale application of computer tomography technology in the security inspection field, and are problems that need to be solved urgently. Summary of the invention

[0003] The purpose of the present invention is to overcome the problems of slow scanning speed and small scanning field of view in the prior art, and to provide a CT scanning imaging system. By increasing the number of scanning devices, scanning units and plate units in the scanning units, a larger scanning field of view and a faster scanning speed are obtained. The system has a compact structure and high working efficiency and accuracy.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a CT scanning imaging system, which mainly includes a carrying platform, a scanning device, a data processing center connected with the scanning device for data signals, and a control center communicating with the scanning device for control signals, wherein the scanning device is arranged at the periphery of the carrying platform through a rotating device, and the scanning device includes two or more scanning units, wherein the scanning unit includes a radiation source and a detector plate corresponding to the radiation source, and the detector plate includes one or more plate units;

[0005] Under the control of the control center, the rotating device drives the scanning device to move around the object to be scanned placed on the supporting platform. The scanning device collects scanning data of the object to be scanned and outputs data signals to the data processing center. After processing by the data processing center, multi-angle two-dimensional images are generated and three-dimensional tomographic images are established.

[0006] Preferably, the carrying platform is provided with a motor and a conveying mechanism driven by the motor for placing the object to be scanned and driving the object to be scanned to move relative to the carrying platform;

[0007] Alternatively, a slide rail is provided on the carrying platform, and the rotating device is arranged on the carrying platform via the slide rail. The rotating device can move relative to the object to be scanned placed on the carrying platform via the slide rail.

[0008] Preferably, the plate unit comprises two or more sub-plates, the sub-plates are arranged side by side at the same height position in the axial direction of the maximum ray range of the scanning unit, and the input surfaces of the two or more sub-plates face the same direction; a rectangle is formed with the outer effective edges of the sub-plates at both ends as four sides, the focus of the ray source is located on the central axis of the rectangle, and the distance from the focus to the input surface remains unchanged;

[0009] The plate unit or the sub-plate comprises an effective pixel area arranged at a central position and capable of receiving the radiation from the radiation source and forming an image, and an ineffective frame arranged around the periphery of the effective pixel area;

[0010] The input surface is a surface of the plate unit or the sub-plate facing the ray source and used for receiving rays from the ray source.

[0011] Preferably, the rotating device comprises an outer frame and a rotating frame rotatably arranged inside the outer frame through a guide wheel assembly, and a fixing ring is arranged inside the rotating frame;

[0012] The ray source is directly fixed on the fixing ring, a fixing frame is provided on the fixing ring, and the detector plate is fixed on the fixing frame.

[0013] Preferably, the guide wheel assembly includes a driving wheel and a driven wheel arranged between the outer frame and the rotating frame, and the driving wheel is driven by a synchronous belt or gear through a motor to drive the rotating frame and the fixed ring to rotate synchronously relative to the outer frame.

[0014] Preferably, the rotating device comprises an inner ring and an outer ring which are arranged concentrically, and the inner ring and the outer ring can rotate relative to each other through a roller assembly, and the inner ring rotates relative to the outer ring when driven by a motor.

[0015] A fixing ring is provided on the inner side of the inner ring;

[0016] The ray source is directly fixed on the fixing ring, a fixing frame is provided on the fixing ring, and the detector plate is fixed on the fixing frame.

[0017] Preferably, there are multiple scanning devices, and the multiple scanning devices are sequentially arranged on the fixing ring.

[0018] Preferably, a slip ring is provided on the rotating frame, and a contact for connecting to an external power source is provided on the slip ring, and the external power source supplies power to the scanning device through the slip ring;

[0019] The scanning device is communicatively connected with the data processing center and the control center via the slip ring.

[0020] Preferably, a high voltage generator is provided in the fixing ring, the high voltage generator is connected to the external power source through the slip ring, and the high voltage generator is connected to the radiation source;

[0021] And / or, a heat dissipation module for dissipating heat from the radiation source is provided in the fixing ring.

[0022] Preferably, the high voltage generator and the heat dissipation module are integrated with the ray source to form a combined ray source.

[0023] Preferably, a data wireless transmission module corresponding to the data processing center is provided on the board unit or the sub-board, and the scanning device collects the scanning data of the object to be scanned and directly outputs the data signal to the data processing center through the data wireless transmission module.

[0024] Preferably, a beam limiter is provided at the ray exit position of the ray source, and the ray range of the ray from the ray source reaching the input surface of the plate unit after passing through the beam limiter is the same as the area size of the effective pixel region.

[0025] Preferably, a flat-panel detector controller and a data processing module are provided on the fixed ring. The scanning data of the object to be scanned collected by the scanning device is processed once by the flat-panel detector controller and the data processing module, and then a data signal is output to the data processing center. After secondary processing by the data processing center, a multi-angle two-dimensional image is generated and a three-dimensional tomographic image is established.

[0026] Preferably, the rotating frame is provided with an encoder for recording the real-time rotation position of the rotating frame, and the encoder is communicatively connected with the data processing center and the control center respectively.

[0027] Preferably, the relative position relationship between any two scanning units in the scanning device includes:

[0028] When the number of the plate units in any two of the scanning units in the scanning device is the same, in the same scanning unit in the same scanning device, among the contour lines formed by the projection of the center line connecting the ray source and the plate unit on the first plane P1 where the ray range is located, a first inscribed circle T1 is formed between one of the outermost contour lines and the contour line formed by the projection of the straight line where the plate unit is located on the first plane P1, and the first inscribed circles T1 in any two of the scanning units overlap;

[0029] When the number of plate units in any two scanning units in the scanning device is different, in any two scanning units in the same scanning device, among the contour lines formed by the projection of the ray range of one of the scanning units on the first plane P1 where the center line connecting the ray source and the plate unit is located, a second inscribed circle T2 can be formed between the two outermost contour lines and the contour line formed by the projection of a straight line where one of the plate units of the other scanning unit is located on the first plane P1.

[0030] Preferably, the outer frame includes a frame and front and rear outer cover plates supported by the frame, the front and rear outer cover plates are respectively provided with front and rear inner cover plates, the front and rear inner cover plates are buckled to form an inner protective cover for protecting the object to be scanned, the setting position of the central symmetry circle of the inner protective cover corresponds to the first inscribed circle T1 or the second inscribed circle T2, and the diameter of the inner protective cover is less than the diameter of the first inscribed circle T1 or the second inscribed circle T2.

[0031] Preferably, the data processing center comprises a data processing unit, an identification unit, a display unit and an alarm unit which are communicatively connected to the control center respectively.

[0032] Preferably, the carrying platform and the scanning device are assembled in a lead box for preventing radiation leakage, the lead box is provided with an entrance and an exit for the object to be scanned to enter and exit, and the entrance and the exit are provided with lead curtains.

[0033] Through the above technical solution, a CT scanning imaging system is provided, which obtains a larger scanning field of view and a faster scanning speed by increasing the number of scanning devices, scanning units and plate units in the scanning units, has a compact structure, and has high working efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the overall structure of a CT scanning imaging system in one embodiment of the present invention;

[0035] Figure 2 A schematic diagram of the relative position relationship between the ray source and the detector plate in an existing scanning unit;

[0036] Figure 3 for Figure 2 A-direction schematic diagram;

[0037] Figure 4 It is a schematic diagram of the structure that a detector board includes two sub-boards in one embodiment of the present invention;

[0038] Figure 5 It is a schematic structural diagram of a detector board including three sub-boards in another embodiment of the present invention;

[0039] Figure 6 and Figure 7 It is a schematic diagram of a configuration structure when the number of plate units in any two scanning units in the same scanning device is the same in one embodiment of the present invention;

[0040] Figure 8 and Fig. 9 It is a schematic diagram of a configuration structure when the number of plate units in any two scanning units in the same scanning device is different in another embodiment of the present invention;

[0041] Fig.10 for Figure 1 Schematic diagram of the B-direction structure.

[0042] Description of Reference Numerals

[0043] 100 carrying platform 200 data processing center 300 control center 400 rotating device 401 driving wheel 402 driven wheel 403 motor 410 outer frame 411 frame 412 front outer cover plate 413 rear outer cover plate 420 rotating frame 421 contact 422 high voltage generator 430 fixing ring 431 fixing frame 432 flat panel detector controller 433 data processing module 500 scanning unit 510 ray source 511 beam limiter 520 detector plate 521 plate unit 5211 first sub-plate 5212 second sub-plate 5213 third sub-plate 600 inner protective cover 700 lead box 710 lead curtain 1000 object to be scanned P1 first plane T1 first inscribed circle T2 second inscribed circle D diameter DETAILED DESCRIPTION

[0044] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0045] In the present invention, unless otherwise specified, directional words such as "up, down, left, right" generally refer to up, down, left, right as shown in the reference drawings; "inside, outside" generally refer to inside and outside relative to the outline of each component itself; "far, near" generally refer to far or near relative to the outline of each component itself.

[0046] like Figure 1 As shown, the present invention provides a CT scanning imaging system, which mainly includes a carrying platform 100, a scanning device, a data processing center 200 connected with the scanning device for data signals, and a control center 300 communicating with the scanning device for control signals. The scanning device is arranged on the periphery of the carrying platform 100 through a rotating device 400. The scanning device may include two or more scanning units 500. Figure 1 In the illustrated embodiment, the scanning device includes two scanning units 500, each of which includes a ray source 510 and a detector plate 520 corresponding to the ray source 510, and the detector plate 520 includes one or more plate units 521. Under the control of the control center 300, the rotating device drives the scanning device to move around the object to be scanned 1000 placed on the carrying platform 100, and the scanning device collects scanning data of the object to be scanned 1000 and outputs data signals to the data processing center 200, and after being processed by the data processing center 200, a multi-angle two-dimensional image is generated and a three-dimensional tomographic image is established.

[0047] In order to enable the scanning device to move around the object 1000 to be scanned placed on the carrier platform 100 while enabling relative movement between the scanning device and the carrier platform 100, so as to realize continuous scanning of multiple objects 1000 to be scanned placed on the carrier platform 100, in practical applications, a motor and a transmission mechanism driven by the motor for placing the object 1000 to be scanned and driving the object 1000 to be scanned relative to the carrier platform 100 can be set on the carrier platform 100 to form a sliding table. For example, the sliding table can be composed of horizontally densely arranged rotating rollers that are easy to penetrate rays and a synchronous belt sleeved on the outside of the rollers. Specifically, a driving motor can be set to drive the driving shaft and the synchronous belt to rotate, and the encoder of the driving motor outputs the rotation speed of the synchronous belt to the driver in real time for controlling the rotation speed of the driving motor. The sliding table drags the object 1000 to be scanned into the field of view of the ray, and the scanning system completes a 180° or 360° scan to obtain the luggage body data, or while the sliding table drags the luggage into the field of view of the ray, the scanning system starts synchronous scanning until the object 1000 to be scanned leaves the scanning area, and the spiral cylindrical body data is obtained for subsequent processing. In addition to the above implementation method using the sliding table, a slide rail can also be set on the carrying platform 100, and the rotating device is set on the carrying platform 100 through the slide rail. While the rotating device rotates, it can move horizontally relative to the object 1000 to be scanned placed on the carrying platform 100 through the slide rail.

[0048] like Figure 2 Combined with Figure 3 As shown, in the prior art, a scanning unit 500 includes a radiation source 510 and a detector plate 520 corresponding to the radiation source 510. Each detector plate 520 may be composed of one or more plate units 521. In this embodiment, a detector plate 520 is composed of two plate units 521. Figure 4 In the embodiment shown, the plate unit 521 includes two sub-plates, a first sub-plate 5211 and a second sub-plate 5212. The first sub-plate 5211 and the second sub-plate 5212 are arranged side by side at the same height position in the axial direction of the maximum radiation range of the scanning unit 500, and the input surfaces of the two sub-plates face the same direction, that is, all face the radiation source 510; a rectangle is formed with the outer effective edges of the first sub-plate 5211 and the second sub-plate 5212 as the four sides, the focus of the radiation source 510 is located on the central axis of the rectangle, and the distance from the focus to the input surface remains unchanged. It should be noted that the plate unit 521 or the sub-plate includes an effective pixel area arranged at the center position that can receive the radiation from the radiation source 510 and form an image, and an invalid border surrounding the periphery of the effective pixel area; the input surface is the surface of the plate unit 521 or the sub-plate facing the radiation source 510 for receiving the radiation from the radiation source. Figure 2 Combined with Figure 3 Comparison Figure 4 It can be seen that the use of Figure 2 and Figure 3 The scanning unit structure shown in the figure includes a ray source 510 and two corresponding detector plates 520, each of which is a separate plate unit 521. The effective scanning area of ​​the scanning unit 500 is a cylinder with a diameter of D and a height of L1. Figure 4 The scanning unit structure shown in FIG. 1 also includes a ray source 510 and two corresponding detector plates 520. Each detector plate 520 is composed of a first sub-plate 5211 and a second sub-plate 5212. The effective scanning area is a cylinder with a diameter of D and a height of L2. Compared with the two, the value of D remains unchanged, but the length of L2 is approximately twice that of L1. Figure 5 ,exist Figure 5 The scanning unit shown in the figure also includes a radiation source 510 and two corresponding detector plates 520, and each detector plate 520 is composed of a first sub-plate 5211, a second sub-plate 5212 and a third sub-plate 5213, that is, each plate unit 521 includes three sub-plates arranged side by side, using Figure 5The scanning unit of the structure shown has an effective scanning area of ​​a cylinder with a diameter of D and a height of L3, that is, in this embodiment, the value of D remains unchanged, and the length of L3 is approximately three times that of L1. It can be seen from the above content that, compared with the prior art, in a scanning unit of the present invention, two or more sub-plates are arranged side by side in a plate unit 521 to expand the range of the effective scanning area of ​​the scanning unit, thereby obtaining a better scanning effect.

[0049] In order to facilitate the scanning device to move around the object 1000 to be scanned placed on the carrying platform 100, Figure 1 As shown, specifically, the rotating device 400 includes an outer frame 410 and a rotating frame 420 rotatably arranged inside the outer frame 410 through a guide wheel assembly, and a fixed ring 430 is arranged inside the rotating frame 420. The ray source 510 is directly fixed on the fixed ring 430, and a fixed frame 431 is arranged on the fixed ring 430, and the detector plate 520 is fixed on the fixed frame 431. The guide wheel assembly includes a driving wheel 401 and a driven wheel 402 arranged between the outer frame 410 and the rotating frame 420, wherein the number of the driven wheels 402 can be set to multiple, and in actual applications, it can be specifically determined according to the required size of the outer frame 410 and the rotating frame 420. The driving wheel 401 can be driven by a synchronous belt or gear drive through a motor 403, so as to drive the rotating frame 420 and the fixed ring 430 to rotate synchronously relative to the outer frame 410.

[0050] In addition to the above structure, the scanning device can also be realized by other structural forms. For example, in other embodiments, the rotating device can also adopt a structure similar to a large bearing. Specifically, the rotating device can include an inner ring and an outer ring arranged concentrically, which can rotate relative to each other through a roller assembly. The inner ring rotates relative to the outer ring under the drive of a motor, and a fixing ring 430 is provided on the inner side of the inner ring; the ray source 510 is directly fixed on the fixing ring 430, and a fixing frame 431 is provided on the fixing ring 430. The detector plate 520 is fixed on the fixing frame 431.

[0051] Combination Figure 1As shown, in order to quickly and effectively supply power, a slip ring (not shown in the figure) is provided on the rotating frame 420, and a contact 421 for connecting to an external power supply is provided on the slip ring. The external power supply is connected to the contact 421 of the slip ring, and the slide rail transmits voltage to the rotating frame 420 to power the scanning device. In order to make the structure of the CT scanning imaging system more compact and realize the integration of various functions, the scanning device can also be connected to the data processing center 200 and the control center 300 through the slip ring. In addition, a high-voltage generator 422 is also provided in the fixed ring 430. The high-voltage generator 422 is connected to the external power supply through the slip ring, and the high-voltage generator 422 is connected to the radiation source 510. In order to further ensure that the scanning imaging system performs scanning operations in a more suitable working environment, a heat dissipation module for dissipating heat from the radiation source 510 is provided in the fixed ring 430. In a preferred embodiment, as needed, the high-voltage generator 422 and the heat dissipation module can be integrated with the radiation source 510 to form a combined radiation source. Figure 1 In the illustrated embodiment, the radiation source 510 is a tube, which is directly fixed on a fixing ring 430. The fixing ring 430 can rotate driven by a rotating frame 420. A high-voltage generator 422 and a heat dissipation module integrated with the tube are used to generate the high voltage required by the tube and to dissipate heat for the tube.

[0052] In order to facilitate the transmission and processing of scanning data, the board unit 521 or the sub-board is provided with a data wireless transmission module corresponding to the data processing center 200. The scanning device collects the scanning data of the object 1000 to be scanned and directly outputs the data signal to the data processing center 200 through the data wireless transmission module.

[0053] In addition, in order to effectively control the emission direction of the ray beam and enable the rays emitted by the ray source 510 to be effectively used to the greatest extent, a beam limiter 511 is provided at the ray exit position of the ray source 510, and the ray range of the rays of the ray source 510 that reach the input surface of the plate unit 521 after passing through the beam limiter 511 is the same as the area size of the effective pixel area. Figure 1 In the illustrated embodiment, the radiation source 510 is a tube, and the beam limiter 511 installed at the radiation outlet of the tube is made of lead material. The radiation outlet of the beam limiter makes the radiation field reaching the input surface of the flat unit the same size as the input surface of the flat unit, thereby reducing the radiation of invalid radiation.

[0054] In order to make the scan data more effectively integrated and applied, the fixed ring 430 is also provided with a flat panel detector controller 432 and a data processing module 433. Since the signals of the multi-channel plate unit 521 need to be uniformly received and then packaged before being sent, the image data generated by the plate unit 521 receiving the x-ray is first processed by the controller and then sent to the data processing module 433 for data processing. The data processing module 433 then transmits the pre-processed data through the wireless transmitting end of the data processing module 433, or the power supply and signal channel of the slip ring can be used to realize the transmission of the power supply voltage, image signal and control signal. In other words, the scan data of the object 1000 to be scanned collected by the scanning device is processed once by the flat panel detector controller 432 and the data processing module 433, and then the data signal is output to the data processing center 200. After the data processing center 200 performs secondary processing, a multi-angle two-dimensional image is generated and a three-dimensional tomographic image is established. The data processing center 200 can be included in the CT scanning imaging system, or it can be a data processing center set outside the system. Regardless of whether the data processing center 200 is an internal system or an external structure, the data processing center 200 can communicate with the data processing module 433 through a wireless terminal, including sending various control signals and receiving feedback signals and scanned image data. After receiving the scanned data, the data processing center 200 performs data reconstruction, display, recognition, alarm and other processing.

[0055] It should be noted that, for the data reconstruction method of the CT scanning imaging system provided by the present invention, under normal circumstances, there are many methods for cone beam CT reconstruction, including accurate cone beam reconstruction algorithm, approximate cone beam reconstruction algorithm, iterative method, etc. The core content of the present invention is to construct different scanning units by adding a ray source 510, and then arrange the different scanning units in a certain way, so as to achieve the purpose of doubling or multiplying the detector receiving plate, while eliminating the physical interval between the plates, achieving full data coverage of the scanning area, and reconstructing a three-dimensional image with sufficient information to achieve further automatic recognition. Therefore, multiple flat-panel detectors are essentially equivalent to a detector plate with a larger area, and their reconstruction can refer to traditional reconstruction theories and methods. In view of the fact that more specific data processing processes and methods do not belong to the key content to be protected by the present invention, they will not be repeated here.

[0056] As can be seen from the above, each scanning device in the CT scanning imaging system provided by the present invention may include two or more scanning units 500, each of which includes a ray source 510 and a detector plate 520 corresponding to the ray source 510, and the detector plate 520 includes one or more plate units 521. Each plate unit 521 may also be composed of a plurality of sub-plates arranged in parallel. Figures 6 to 9The following further illustrates the setting method and position relationship of the relative position relationship of any two scanning units in the same scanning device by taking the two situations that the setting numbers of plate units in any two scanning units in the same scanning device are the same or different.

[0057] When the number of the plate units 521 in any two scanning units 500 in the scanning device is the same, Figure 6 Combined with Figure 7 In the embodiment shown, two scanning units in the same scanning device are composed of a radiation source 510 and a detector plate 520 corresponding to the radiation source 510, and the number of plate units 521 in the detector plates 520 of the two scanning units is the same, that is, one. Figure 7 The ray range of the scanning device shown is a contour line formed by the projection of the center line connecting the ray source 510 and the plate unit 521 on the first plane P1, and a first inscribed circle T1 is formed between one of the outermost contour lines and the contour line formed by the projection of the straight line where the plate unit 521 is located on the first plane P1, and the first inscribed circles T1 in any two of the scanning units coincide.

[0058] When the number of the plate units 521 in any two scanning units 500 in the scanning device is different, Figure 8 Combined with Fig. 9 In the embodiment shown, two scanning units in the same scanning device are both composed of a radiation source 510 and a detector plate 520 corresponding to the radiation source 510. The number of detector plates 520 provided in the two scanning units is different. The number of plate body units 521 provided in one detector plate 520 is one, and the number of plate body units 521 provided in the other detector plate 520 is two. Fig. 9 The ray range of the scanning device shown is a contour line formed by the projection of the center line connecting the ray source 510 and the plate unit 521 on the first plane P1, and a second inscribed circle T2 can be formed between the two outermost contour lines and the contour line formed by the projection of a straight line where the plate unit 521 of another scanning unit is located on the first plane P1.

[0059] like Fig.10 Combined with Figure 1 As shown, an inner protective cover 600 is provided in the CT scanning imaging system to protect the object 1000 to be scanned and prevent other debris from entering the scanning area. The space inside the inner protective cover 600 is the scanning area. Fig.10As shown, the outer frame 410 includes a frame 411 and a front outer cover plate 412 and a rear outer cover plate 413 supported by the frame 411, and the front outer cover plate 412 and the rear outer cover plate 413 are respectively provided with front and rear inner cover plates (not shown in the figure), and the front and rear inner cover plates are buckled to form an inner protective cover 600 for protecting the object to be scanned, and the setting position of the central symmetry circle of the inner protective cover 600 corresponds to the first inscribed circle T1 or the second inscribed circle T2, and the diameter of the inner protective cover 600 is slightly smaller than the diameter of the first inscribed circle T1 or the second inscribed circle T2.

[0060] Furthermore, in order to facilitate the processing and display of scanning data and promptly remind operators to perform emergency processing when a failure occurs in the scanning imaging system, the data processing center 200 includes a data processing unit, an identification unit, a display unit and an alarm unit (not shown in the figure) which are respectively communicatively connected to the control center 300.

[0061] like Fig.10 As shown, for safety reasons and to prevent unnecessary radiation leakage, the support platform 100 and the scanning device are assembled in a lead box 700 for preventing radiation leakage. The lead box 700 is provided with an entrance and an exit for the object to be scanned to enter and exit. The entrance and the exit are provided with lead curtains 710 for preventing radiation leakage.

[0062] Furthermore, in order to obtain a larger scanning field of view and a faster scanning speed, in the CT scanning imaging system provided by the present invention, the number of the scanning devices can be multiple, and the multiple scanning devices can be sequentially arranged on the same fixed ring 430 without interfering with each other. Of course, multiple rotating frames 420 that can rotate synchronously can also be arranged, and different scanning devices can be respectively fixed on the fixed ring 430 corresponding to each rotating frame 420, and the arrangement positions of the scanning devices arranged on different rotating frames 420 should be evenly distributed in this circumferential direction. In order to effectively distribute the scanning data of different scanning devices arranged in the same scanning imaging system, the rotating frame 420 is provided with an encoder for recording the real-time rotation position of the rotating frame 420, and the encoder is respectively connected to the data processing center 200 and the control center 300 for communication, and records the real-time position of the rotating frame 420 when rotating.

[0063] The specific application, working mode and process of the CT scanning imaging system provided by the present invention are described below in combination with different embodiments. In the following embodiment, the CT scanning imaging system is used to scan luggage during security inspection.

[0064] Specifically, the CT working process can be divided into two types: one is scanning when the luggage is stationary, and the other is scanning when the luggage is moving. The following describes these two methods respectively.

[0065] Scanning of luggage at rest:

[0066] 1. Place the luggage to be scanned in the aforementioned effective scanning area;

[0067] 2. Set all radiation sources 510 to the same appropriate KV and mA, that is, the dose is the same, and all detector panels are set to the same parameters;

[0068] 3. Start the motor and drive the rotating frame to start rotating;

[0069] 4. The radiation source 510 starts to emit radiation, and each panel unit receives the X-rays to generate scanning data and sends it to the data processing center;

[0070] 5. The data processing center receives the data sent by the board units in each detector board, packages it, and sends it through the wireless terminal or slip ring signal channel;

[0071] 6. According to the image resolution requirements, the scanning ends after the rotating frame rotates 180° or one circle;

[0072] 7. The external image processing system receives the data and performs noise reduction, reconstruction, automatic recognition and other processing.

[0073] Scanning of luggage in motion:

[0074] 1. Place the baggage to be scanned outside the aforementioned effective scanning area;

[0075] 2. Set all radiation sources 510 to the same appropriate KV and mA, i.e., the dose is the same, and all detector panels are set to the same parameters;

[0076] 3. According to the width L of the effective scanning area (i.e. L1, L2, L3 mentioned above), set the travel speed of the carrying platform. According to the image resolution requirements, it is usually set that the luggage moves forward a distance of L for every 180° or one revolution of the rotating frame;

[0077] 4. Start the motor and drive the rotating frame to start rotating;

[0078] 5. The radiation source 510 starts to emit radiation, and the plate units in each detector plate begin to receive X-rays, generate scanning data and send it to the data processing center;

[0079] 6. The carrying platform drags the luggage into the scanning area at a constant speed;

[0080] 7. The data processing center receives the data sent by the board units in each detector board, packages it, and sends it through the wireless terminal or slip ring signal channel;

[0081] 8. The external image processing system receives the data and starts noise reduction, reconstruction, automatic recognition and other processing synchronously.

[0082] Multi-energy spectrum scanning:

[0083] The above is a single energy scanning method. When the system is equipped with dual or multiple scanning devices, dual or multiple energy scanning methods can be used to obtain a higher density contrast. The following is the specific working process (taking the scanning of moving luggage as an example):

[0084] 1. Place the baggage to be scanned outside the aforementioned effective scanning area;

[0085] 2. Set the radiation sources 510 of different scanning devices to different KV and mA, such as 160KV / 10mA and 120kv / 20mA respectively. The KV and mA of all radiation sources 510 in the same scanning device must be the same, and the detector boards in the same scanning device are set to the same parameters;

[0086] 3. Determine the travel speed of the load-bearing platform based on the width L of the effective scanning area of ​​a single system (i.e., L1, L2, L3 mentioned above). According to the image resolution requirements, it is usually set that the distance the luggage moves forward is L for every 180° or one revolution of the rotating frame;

[0087] 4. Start the motor and drive the rotating frame to start rotating;

[0088] 5. The radiation from the radiation source 510 is activated, and the plate units in each detector plate begin to receive the x-rays to generate scanning data and send it to the data processing center;

[0089] 6. The carrying platform drags the luggage into the scanning area at a constant speed;

[0090] 7. The data processing center receives the data sent by the board units in each detector board, packages it, and sends it through the wireless terminal or slip ring signal channel;

[0091] 8. The external image processing system receives the data, performs noise reduction, reconstruction, automatic recognition and other processing on the data of two or more scanning devices, obtains the baggage information under different scanning energies, and further performs comprehensive processing.

[0092] It can be seen that under the dual or multi-energy scanning mode, the dual or multi-scanning device completes the scanning at the same speed as the single scanning device.

[0093] Horizontal tomography and 3D reconstruction:

[0094] This scanning mode is only applicable when all scanning units are arranged in parallel, that is, all ray sources 510 are arranged on the same straight line, and the straight line is parallel to the axis of the cylinder of the effective scanning area. At this time, the plate units in all detector plates are assembled as continuous arcs. Specific operation process:

[0095] 1. Place the baggage to be scanned outside the aforementioned effective scanning area;

[0096] 2. Set all radiation sources 510 to the same appropriate KV and mA, i.e., the dose is the same, and all detector panels are set to the same parameters;

[0097] 3. Set the speed of the carrying platform according to the resolution requirements of the tomographic image;

[0098] 4. Keep the rotating frame still;

[0099] 5. The radiation from the radiation source 510 is activated, and the plate units in each detector plate begin to receive the x-rays to generate scanning data and send it to the data processing center;

[0100] 6. The carrying platform drags the luggage through the scanning area at a constant speed;

[0101] 7. The data processing center receives the data sent by the board units in each detector board, packages it, and sends it through the wireless terminal or slip ring signal channel;

[0102] 8. After the external image processing system receives the data, it begins to overlay and reconstruct the images of each horizontal fault to further obtain a three-dimensional image, and then performs further data processing such as automatic recognition.

[0103] Dual-energy or multi-energy horizontal tomography and 3D reconstruction:

[0104] This scanning method is only applicable when all scanning units of two or more scanning devices are arranged in parallel, that is, all the ray sources 510 are arranged on the same straight line, and the straight line is parallel to the axis of the cylinder of the effective scanning area. At this time, the plate units in all detector plates are assembled as continuous arcs. Specific operation process:

[0105] 1. Place the baggage to be scanned outside the aforementioned effective scanning area;

[0106] 2. Set the radiation sources 510 of different scanning devices to different KV and mA, such as 160KV / 10mA and 120kv / 20mA respectively. The KV and mA of all radiation sources 510 in the same scanning device must be the same, and the detector boards in the same scanning device are set to the same parameters;

[0107] 3. Set the speed of the carrying platform according to the resolution requirements of the tomographic image;

[0108] 4. Keep the rotating frame still;

[0109] 5. The radiation from the radiation source 510 is activated, and the plate units in each detector plate begin to receive the x-rays to generate scanning data and send it to the data processing center;

[0110] 6. The carrying platform drags the luggage through the scanning area at a constant speed;

[0111] 7. The data processing center receives the data sent by the board units in each detector board, packages it, and sends it through the wireless terminal or slip ring signal channel;

[0112] 8. After the external image processing system receives the data, it begins to superimpose the data obtained by different scanning devices to reconstruct the images of each horizontal fault, and further obtain a three-dimensional image. Based on this, further automatic recognition and other data processing are performed.

[0113] It can be seen from the above that in the CT scanning imaging system provided by the present invention, when the CT scanning system includes two or more scanning devices set to the same exposure dose kv and mA, or when the flat panel units of each scanning unit are assembled into two or more, it is essentially two or more single scanning devices working synchronously, thereby obtaining double or multiple data collection volume, and improving the resolution of the system. In the case where only the system resolution of a single scanning device is required, the travel speed of the object to be scanned can be increased by two or more times, and then the scanning devices work in coordination, and each scanning device only collects 1 / n (n is the number of scanning device settings) data to integrate and reconstruct a complete image. Therefore, the speed of completing the scan can be effectively improved. The axial scanning area of ​​the scanning system will become twice or more than that of a single scanning device and / or a single scanning flat panel unit. At this time, the luggage dragging speed of the load-bearing platform can be increased by two or more times, and a scanning image with the same resolution can be obtained. When this high-speed luggage dragging speed is not required, a three-dimensional image with a higher resolution can be reconstructed within the same scanning field of view because more volume data is obtained.

[0114] When the scanning device is configured so that two or more scanning units with the same exposure dose kv and mA are arranged in parallel, that is, the radiation source 510 is on the same axis perpendicular to the scanning section, since the flat panel detectors are arranged in an arc shape in a continuous manner at this time, when the scanning frame is stationary, the moving luggage can be scanned, and continuous multi-angle two-dimensional images of all the luggage in the scanning field of view can be obtained, and a three-dimensional tomographic image can be reconstructed.

[0115] When two or more scanning devices are configured, different scanning devices can be set to different high voltages. The scanning speed will not be improved at this time, but CT scanning images with different energy spectra can be obtained at the same time, greatly improving the density sensitivity of scanning luggage. Different voltages can be used to perform multi-spectrum CT to improve the density resolution of objects in the low energy zone, especially for explosives, which should have a higher resolution.

[0116] When all scanning units of two or more scanning devices are configured in parallel, that is, the radiation source 510 is on the same axis perpendicular to the scanning section, the two or more scanning devices are set to different high voltages, and the moving luggage is scanned when the scanning frame is stationary. Continuous multi-angle two-dimensional images of different energy spectra of all luggage in the scanning field of view can be obtained and three-dimensional tomographic images can be reconstructed, which can help determine the density properties of the scanned object.

[0117] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications. For example, the number of settings of the scanning device and the flatbed unit can be adjusted as needed to achieve the best effect. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A CT scanning imaging system, mainly comprising a carrying platform (100), a scanning device, a data processing center (200) connected to the scanning device for data signals, and a control center (300) connected to the scanning device for control signals, wherein the scanning device is arranged on the periphery of the carrying platform (100) via a rotating device (400), and characterized in that: The scanning device comprises two or more scanning units (500), the scanning unit (500) comprises a ray source (510) and a detector plate (520) arranged corresponding to the ray source (510), the detector plate (520) comprises one or more plate units (521); The plate unit (521) comprises two or more sub-plates, the sub-plates being arranged side by side at the same height position in the axial direction of the maximum ray range of the scanning unit (500), and the input surfaces of the two or more sub-plates facing the same direction; a rectangle is formed with the outer effective edges of the sub-plates at both ends as four sides, the focus of the ray source (510) is located on the central axis of the rectangle, and the distance from the focus to the input surface remains unchanged; The plate unit (521) or the sub-plate comprises an effective pixel area arranged at a central position and capable of receiving the radiation from the radiation source and forming an image, and an ineffective frame arranged around the periphery of the effective pixel area; The input surface is a surface of the plate unit (521) or the sub-plate facing the ray source (510) and used for receiving rays from the ray source; The relative position relationship between any two scanning units (500) in the scanning device includes: When the number of the plate units (521) in any two of the scanning units (500) in the scanning device is the same, in the same scanning unit (500) in the same scanning device, among the contour lines formed by the projection of the ray range on the first plane (P1) where the center line connecting the ray source (510) and the plate unit (521) is located, a first inscribed circle (T1) is formed between one of the outermost contour lines and the contour line formed by the projection of the straight line where the plate unit (521) is located on the first plane (P1), and the first inscribed circles (T1) in any two of the scanning units (500) overlap; When the number of the plate units (521) in any two of the scanning units (500) in the scanning device is different, in any two of the scanning units (500) in the same scanning device, among the contour lines formed by the projection of the ray range of one of the scanning units (500) on the first plane (P1) where the center line connecting the ray source (510) and the plate unit (521) is located, a second inscribed circle (T2) can be formed between the two outermost contour lines and the contour line formed by the projection of a straight line where one of the plate units (521) of the other scanning unit (500) is located on the first plane (P1); The rotating device (400), under the control of the control center (300), drives the scanning device to move around the object to be scanned (1000) placed on the carrying platform (100); the scanning device collects scanning data of the object to be scanned (1000) and outputs data signals to the data processing center (200); after processing by the data processing center (200), a multi-angle two-dimensional image is generated and a three-dimensional tomographic image is established.

2. The CT scanning imaging system according to claim 1, characterized in that: The carrying platform (100) is provided with a motor and a transmission mechanism driven by the motor and used for placing the object to be scanned (1000) and driving the object to be scanned (1000) to move relative to the carrying platform (100); Alternatively, a slide rail is provided on the carrying platform (100), the rotating device (400) is arranged on the carrying platform (100) via the slide rail, and the rotating device (400) can move relative to the object to be scanned (1000) placed on the carrying platform (100) via the slide rail.

3. The CT scanning imaging system according to claim 1, characterized in that: The rotating device (400) comprises an outer frame (410) and a rotating frame (420) rotatably arranged inside the outer frame (410) via a guide wheel assembly, and a fixing ring (430) is provided inside the rotating frame (420); The ray source (510) is directly fixed on the fixing ring (430), a fixing frame (431) is provided on the fixing ring (430), and the detector plate (520) is fixed on the fixing frame (431).

4. The CT scanning imaging system according to claim 3, characterized in that: The guide wheel assembly comprises a driving wheel (401) and a driven wheel (402) arranged between the outer frame (410) and the rotating frame (420); the driving wheel (401) is driven by a synchronous belt or gear through a motor (403), thereby driving the rotating frame (420) and the fixed ring (430) to rotate synchronously relative to the outer frame (410).

5. The CT scanning imaging system according to claim 1, characterized in that: The rotating device (400) comprises an inner ring and an outer ring which are arranged concentrically, and the inner ring and the outer ring can rotate relative to each other via a roller assembly, and the inner ring rotates relative to the outer ring when driven by a motor. A fixing ring is provided on the inner side of the inner ring; The ray source (510) is directly fixed on the fixing ring (430), a fixing frame (431) is provided on the fixing ring (430), and the detector plate (520) is fixed on the fixing frame (431).

6. The CT scanning imaging system according to claim 3, characterized in that: The scanning devices are arranged in a plurality, and the plurality of scanning devices are arranged in sequence on the fixing ring (430).

7. The CT scanning imaging system according to claim 3, characterized in that: The rotating frame (420) is provided with a slip ring, and the slip ring is provided with a contact (421) for connecting to an external power source, and the external power source supplies power to the scanning device through the slip ring; The scanning device is communicatively connected to the data processing center (200) and the control center (300) via the slip ring.

8. The CT scanning imaging system according to claim 7, characterized in that: A high voltage generator (422) is provided in the fixing ring (430), the high voltage generator (422) is connected to the external power source via the slip ring, and the high voltage generator (422) is connected to the radiation source (510); And / or, a heat dissipation module for dissipating heat from the radiation source (510) is provided in the fixing ring (430).

9. The CT scanning imaging system according to claim 8, characterized in that: The high voltage generator (422) and the heat dissipation module are integrated with the ray source (510) to form a combined ray source.

10. The CT scanning imaging system according to claim 1, characterized in that: The board unit (521) or the sub-board is provided with a data wireless transmission module arranged corresponding to the data processing center (200), and the scanning device collects scanning data of the object to be scanned and directly outputs a data signal to the data processing center (200) through the data wireless transmission module.

11. The CT scanning imaging system according to claim 1, characterized in that: A beam limiter (511) is provided at the ray exit position of the ray source (510); after the rays of the ray source (510) pass through the beam limiter (511), the ray range reaching the input surface of the plate unit (521) is the same as the area size of the effective pixel area.

12. The CT scanning imaging system according to claim 3, characterized in that: The fixed ring (430) is provided with a flat panel detector controller (432) and a data processing module (433). The scanning data of the object to be scanned (1000) collected by the scanning device is processed once by the flat panel detector controller (432) and the data processing module (433), and then outputs a data signal to the data processing center (200). After secondary processing by the data processing center (200), a multi-angle two-dimensional image is generated and a three-dimensional tomographic image is established.

13. The CT scanning imaging system according to claim 3, characterized in that: An encoder for recording the real-time rotation position of the rotating frame (420) is provided on the rotating frame (420), and the encoder is respectively connected to the data processing center (200) and the control center (300) for communication.

14. The CT scanning imaging system according to claim 3, characterized in that: The outer frame (410) comprises a frame (411) and a front outer cover plate (412) and a rear outer cover plate (413) supported by the frame (411); the front outer cover plate (412) and the rear outer cover plate (413) are respectively provided with a front inner cover plate and a rear inner cover plate; the front inner cover plates and the rear inner cover plates are buckled together to form an inner protective cover (600) for protecting the object to be scanned; the central symmetry circle of the inner protective cover (600) is arranged at a position corresponding to the first inscribed circle (T1) or the second inscribed circle (T2); and the diameter of the inner protective cover (600) is less than the diameter of the first inscribed circle (T1) or the second inscribed circle (T2).

15. The CT scanning imaging system according to claim 1, characterized in that: The data processing center (200) comprises a data processing unit, an identification unit, a display unit and an alarm unit which are respectively communicatively connected to the control center.

16. The CT scanning imaging system according to claim 1, characterized in that: The carrying platform (100) and the scanning device are assembled in a lead box (700) for preventing radiation leakage; the lead box (700) is provided with an entrance and an exit for allowing the object (1000) to be scanned to enter and exit; the entrance and the exit are provided with lead curtains (710).

Images