CN111272786A

CN111272786A - CT scanning imaging system

Info

Publication number: CN111272786A
Application number: CN202010239308.7A
Authority: CN
Inventors: 赵磊; 李跃; 赵鹏; 刘雅卓
Original assignee: 赵磊; 李跃; 赵鹏; 刘雅卓
Priority date: 2020-03-30
Filing date: 2020-03-30
Publication date: 2020-06-12

Abstract

The invention relates to the field of CT scanning equipment manufacturing, and discloses a CT scanning imaging system which mainly comprises a bearing platform, a scanning device, a data processing center and a control center, wherein the scanning device is arranged on the periphery of the bearing platform through a rotating device and comprises two or more scanning units, each scanning unit comprises a ray source and a detector plate arranged corresponding to the ray source, and each detector plate comprises one or more plate body units; the rotating device drives the scanning device to move around an object to be scanned placed on the bearing platform under the control of the control center, the scanning device collects scanning data of the object to be scanned and outputs a data signal to the data processing center, and the data processing center processes the data signal to generate a multi-angle two-dimensional image and establish a three-dimensional tomographic image. The invention can obtain larger scanning visual field and faster scanning speed, and has compact structure and higher working efficiency and accuracy.

Description

CT scanning imaging system

Technical Field

The invention relates to the field of manufacturing of CT scanning equipment, in particular to a CT scanning imaging system.

Background

The computed tomography technology based on X-ray radiation imaging, which is called CT technology for short, can obtain characteristic distribution data of scanned substances in a fault layer through CT data reconstruction, and can realize the identification of an object to be detected through analyzing the characteristic data. CT scanning technology has been widely used in the medical field because of its high sensitivity and accuracy, and with the wide application of this technology, in addition to the medical field, it has recently come to be used for security inspection in public places, for example: and identifying the suspicion substances commonly found in the luggage. In the existing security inspection equipment, not only the number of the scanning devices is small, but also the arrangement mode of the detector plate in each scanning device is single, so that the problems of low scanning speed and limited scanning range are caused. Therefore, in the field of security inspection of baggage articles, improving the scanning speed of a security inspection machine, reducing the occupied area of equipment, particularly the size of the detection range of the equipment, are all key factors influencing the large application of the computed tomography technology in the field of security inspection, and are a problem to be solved urgently.

Disclosure of Invention

The invention aims to solve the problems of low scanning speed and small scanning visual field range in the prior art, and provides a CT scanning imaging system.

In order to achieve the above object, in one aspect, the present invention provides a CT scanning imaging system, which mainly includes a supporting platform, a scanning device, a data processing center connected to the scanning device by data signals, and a control center communicating with the scanning device by control signals, wherein the scanning device is disposed on the periphery of the supporting platform by a rotating device, the scanning device includes two or more scanning units, the scanning units include a radiation source and a detector board disposed corresponding to the radiation source, and the detector board includes one or more board units;

the rotating device drives the scanning device to move around the object to be scanned placed on the bearing platform under the control of the control center, the scanning device collects scanning data of the object to be scanned and outputs a data signal to the data processing center, and the data processing center processes the data signal to generate a multi-angle two-dimensional image and establish a three-dimensional sectional image.

Preferably, the bearing platform is provided with a motor and a transmission mechanism which is driven by the motor and is used for placing the object to be scanned and driving the object to be scanned to move relative to the bearing platform;

or, a slide rail is arranged on the bearing platform, the rotating device is arranged on the bearing platform through the slide rail, and the rotating device can move relative to the object to be scanned on the bearing platform through the slide rail.

Preferably, the plate body unit includes 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; the outer effective edges of the daughter boards at two ends are in a quadrilateral rectangular shape, the focus of the radioactive source is positioned on the central axis of the rectangle, and the distance from the focus to the input surface is kept unchanged;

the plate body unit or the daughter board comprises an effective pixel area which is arranged at the central position and can receive the ray of the ray source and image, and an invalid frame which is arranged around the periphery of the effective pixel area;

the input surface is a surface of the plate body unit or the daughter board facing the ray source and used for receiving rays of the ray source.

Preferably, the rotating device comprises an outer frame and a rotating frame rotatably arranged on the inner side of the outer frame through a guide wheel assembly, and a fixing ring is arranged inside the rotating frame;

the ray source is directly fixed on the fixing ring, the fixing ring is provided with a fixing frame, and the detector plate is fixed on the fixing frame.

Preferably, the guide wheel assembly comprises a driving wheel and a driven wheel which are arranged between the outer frame and the rotating frame, the driving wheel drives a synchronous belt or a gear to drive through a motor, and the rotating frame and the fixing ring are driven to synchronously rotate relative to the outer frame.

Preferably, the rotating device comprises an inner ring and an outer ring which are concentrically arranged and can rotate relatively through a roller assembly, the inner ring rotates relative to the outer ring under the drive of a motor,

a fixing ring is arranged on the inner side of the inner ring;

Preferably, the number of the scanning devices is multiple, and the multiple scanning devices are sequentially arranged on the fixed ring.

Preferably, a slip ring is arranged on the rotating frame, a contact for connecting with an external power supply is arranged on the slip ring, and the external power supply supplies power to the scanning device through the slip ring;

and the scanning device is in communication connection with the data processing center and the control center through the slip ring.

Preferably, a high voltage generator is arranged in the fixed ring, the high voltage generator is connected with the external power supply through the slip ring, and the high voltage generator is connected with the ray source;

and/or a heat dissipation module used for dissipating heat of the ray source is arranged in the fixed ring.

Preferably, the high voltage generator and the radiation source heat sink are integrated with the radiation source to form a combined radiation source.

Preferably, the plate body unit or the daughter board is provided with a data wireless transmission module corresponding to the data processing center, and the scanning device collects scanning data of the object to be scanned and directly outputs a data signal to the data processing center through the data wireless transmission module.

Preferably, a beam limiter is arranged at a ray exit position of the ray source, and a ray range in which rays of the ray source pass through the beam limiter and reach an input surface of the plate unit is the same as the area of the effective pixel region.

Preferably, the fixed ring is provided with a flat panel detector controller and a data processing module, the scanning data of the object to be scanned, which is acquired by the scanning device, is subjected to primary processing by the flat panel detector controller and the data processing module, and then the data signal is output to the data processing center, and after secondary processing is performed by the data processing center, a multi-angle two-dimensional image is generated and a three-dimensional tomographic image is established.

Preferably, the rotating frame is provided with an encoder for recording the real-time rotating position of the rotating frame, and the encoder is in communication connection with the data processing center and the control center respectively.

Preferably, the relative position relationship of any two scanning units in the scanning device includes:

when the number of the plate units in any two scanning units in the scanning device is the same, in the same scanning unit in the same scanning device, in a contour line formed by the projection of the ray range on a first plane P1 where the central connecting line of the ray source and the plate unit is located, a first inscribed circle T1 is formed between one of the contour lines located on the outermost side and a contour line formed by the projection of a straight line where the plate unit is located on the first plane P1, and the first inscribed circles T1 in any two scanning units are coincident;

work as in scanning device arbitrary two in the scanning unit the plate body unit's quantity is different, and is same in two arbitrary scanning units in scanning device, one of them scanning unit the ray range is in the ray source with in the contour line that the projection on the first plane P1 that the line of center between the two of plate body unit belongs to, be located two contour lines of the outside and one of another scanning unit the straight line of plate body unit place can form second inscribed circle T2 between the contour line that the projection on first plane P1 formed.

Preferably, the frame includes the frame and passes through preceding, back dustcoat board that the frame supported, preceding, back dustcoat board is last to be equipped with preceding, back inner shroud respectively, preceding, back inner shroud lock forms and is used for the protection treat the interior safety cover of scanned object, the central symmetry circle of interior safety cover set up the position with first inscribed circle T1 or second inscribed circle T2 corresponds, the diameter of interior safety cover < first inscribed circle T1 or second inscribed circle T2's diameter.

Preferably, the data processing center comprises a data processing unit, an identification unit, a display unit and an alarm unit which are respectively in communication connection with the control center.

Preferably, the bearing platform and the scanning device are assembled in a lead box for preventing ray leakage, an inlet and an outlet for enabling the object to be scanned to enter and exit are formed in the lead box, and a lead curtain is arranged at the inlet and the outlet.

Through the technical scheme, the CT scanning imaging system is provided, the number of the plate units in the scanning device, the scanning unit and the scanning unit is increased, a larger scanning visual field and a faster scanning speed are obtained, the structure is compact, and the working efficiency and the accuracy are higher.

Drawings

FIG. 1 is a schematic diagram of an overall structure of a CT scanning imaging system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a relative position relationship between a radiation source and a detector plate in a conventional scanning unit;

FIG. 3 is a schematic view of FIG. 2 taken along line A;

FIG. 4 is a schematic diagram of a probe card including two daughter boards according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a detector board including three daughter boards according to another embodiment of the present invention;

fig. 6 and 7 are schematic diagrams illustrating an arrangement structure of any two scanning units in the same scanning device according to an embodiment of the present invention, wherein the number of the plate units is the same;

fig. 8 and 9 are schematic views of the arrangement structure of any two scanning units in the same scanning device in different numbers according to another embodiment of the present invention;

fig. 10 is a schematic view of the structure in the direction B of fig. 1.

Description of the reference numerals

100 load-bearing platform 200 data processing center 300 control center 400 rotating means 401 capstan 402 drive wheel 403 motor 410 outer frame 411 frame 412 outer frame 412 back outer cover plate 413 fixed ring 431 fixed ring 432 flat panel detector controller 433 data processing module 500 scanning unit 510 radiation source 511 beam limiter 520 detector plate 521 plate body unit 5211 first daughter board 5212 second daughter board 5213 inner cover 600 lead box 710 lead curtain 1000 to-be-scanned object P1 first plane T1 first inscribed circle T2 second inscribed circle D diameter

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the present invention, the use of directional terms such as "upper, lower, left, right" generally means upper, lower, left, right as viewed with reference to the accompanying drawings, unless otherwise specified; "inner and outer" generally refer to the inner and outer relative to the profile of the components themselves; "distal and proximal" generally refer to distance relative to the contour of the components themselves.

As shown in fig. 1, the present invention provides a CT scanning imaging system, which mainly includes a supporting platform 100, a scanning device, a data processing center 200 connected to the scanning device via data signals, and a control center 300 in communication with the scanning device via control signals, wherein the scanning device is disposed on the periphery of the supporting platform 100 via a rotating device 400. The scanning apparatus may include two or more scanning units 500, in the embodiment shown in fig. 1, the scanning apparatus includes two scanning units 500, the scanning unit 500 includes a radiation source 510 and a detector board 520 disposed corresponding to the radiation source 510, and the detector board 520 includes one or more board units 521. The rotating device drives the scanning device to move around the object 1000 to be scanned placed on the bearing platform 100 under the control of the control center 300, the scanning device collects scanning data of the object 1000 to be scanned and outputs a data signal to the data processing center 200, and the data signal is processed by the data processing center 200 to generate a multi-angle two-dimensional image and establish a three-dimensional tomographic image.

In order to enable the scanning device and the carrying platform 100 to move relatively while the scanning device moves around the object 1000 to be scanned placed on the carrying platform 100, so as to enable a plurality of objects 1000 to be scanned placed on the carrying platform 100 to be continuously scanned, in practical applications, a motor and a conveying mechanism driven by the motor and used for placing the object 1000 to be scanned and driving the object 1000 to be scanned to move relative to the carrying platform 100 may be disposed on the carrying platform 100 to form a sliding table. Such as: the sliding table top can be composed of rotating rollers which are horizontally and densely arranged and easily penetrate through rays and a synchronous belt sleeved outside the rollers. Particularly, the driving shaft and the synchronous belt can be driven to rotate by arranging the driving motor, and the encoder of the driving motor outputs the rotating speed of the synchronous belt in real time to the driver to control the rotating speed of the driving motor. The sliding table drags the object 1000 to be scanned into the ray view field, the scanning system finishes 180-degree or 360-degree scanning to obtain luggage body data, or the sliding table drags luggage to enter the ray view field, and the scanning system starts synchronous scanning until the object 1000 to be scanned leaves the scanning area to obtain spiral cylindrical body data, and then subsequent processing is carried out. In addition to the above implementation manner using the sliding table, a sliding rail may also be disposed on the carrying platform 100, the rotating device is disposed on the carrying platform 100 through the sliding rail, and the rotating device can horizontally move relative to the object 1000 to be scanned placed on the carrying platform 100 through the sliding rail while rotating.

As shown in fig. 2 in conjunction with fig. 3, in the prior art, one scanning unit 500 includes a radiation source 510 and a detector board 520 disposed corresponding to the radiation source 510. Each detector board 520 may be comprised of one or more board units 521, and in this embodiment, one detector board 520 is comprised of two board units 521. In contrast to the embodiment of the present invention as shown in fig. 4, the board unit 521 includes two sub-boards, a first sub-board 5211 and a second sub-board 5212, the first sub-board 5211 and the second sub-board 5212 are 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 sub-boards face to the same direction, that is: all toward source 510; the outer effective edges of the first sub-board 5211 and the second sub-board 5212 are formed in a rectangular shape with four sides, the focal point of the radiation source 510 is located on the central axis of the rectangular shape, and the distance from the focal point to the input surface is kept constant. It should be noted that the plate body unit 521 or the daughter board includes an effective pixel region disposed at a central position and capable of receiving the radiation of the radiation source 510 and forming an image, and an invalid frame surrounding the periphery of the effective pixel region; the input surface is a surface of the plate body unit 521 or the daughter board facing the radiation source for receiving the radiation of the radiation source. As can be seen from fig. 2 and fig. 4 combined with fig. 3, with the scanning unit structure shown in fig. 2 and fig. 3, including one radiation source 510 and two correspondingly disposed detector boards 520, each detector board 520 is a single board unit 521, and the effective scanning area of the scanning unit 500 is a cylinder with a diameter D and a height L1. With the scanning unit structure shown in fig. 4, which also includes a radiation source 510 and two corresponding detector boards 520, each detector board 520 is composed of a first sub-board 5211 and a second sub-board 5212, the effective scanning area is a cylinder with a diameter D and a height L2, and compared with the two, the value of D is unchanged, and the length of L2 is approximately twice as long as L1. Similarly, referring to fig. 5, in the scanning unit shown in fig. 5, one radiation source 510 and two corresponding detector boards 520 are also included, and each detector board 520 is composed of a first sub-board 5211, a second sub-board 5212 and a third sub-board 5213, that is, each board unit 521 includes three sub-boards arranged side by side, and with the scanning unit of the structure shown in fig. 5, the effective scanning area is a cylinder with a diameter D and a height L3, that is, in the present embodiment, the value of D is unchanged, and the length of L3 is approximately three times that of L1. As can be seen from the above, compared with the prior art, in one scanning unit of the present invention, the range of the effective scanning area of the scanning unit can be enlarged by arranging two or more sub-boards in parallel in one board unit 521, so as to obtain a better scanning effect.

In order to facilitate the movement of the scanning device around the object 1000 to be scanned placed on the carrying platform 100, as shown in fig. 1, specifically, the rotating device 400 includes an outer frame 410 and a rotating frame 420 rotatably disposed inside the outer frame 410 through a guide wheel assembly, and a fixing ring 430 is disposed inside the rotating frame 420. The radiation source 510 is directly fixed on the fixing ring 430, a fixing frame 431 is disposed on the fixing ring 430, and the detector plate 520 is fixed on the fixing frame 431. The guide wheel assembly includes a driving wheel 401 and a driven wheel 402 disposed between the outer frame 410 and the rotating frame 420, wherein the number of the driven wheels 402 can be set to be plural, and in practical applications, the number of the driven wheels can be specifically determined according to the size of the outer frame 410 and the rotating frame 420. The driving wheel 401 can drive a synchronous belt or a gear drive by the motor 403, and drive the rotating frame 420 and the fixing ring 430 to rotate synchronously relative to the outer frame 410.

Besides the above structure, the scanning device can move around the object 1000 to be scanned placed on the carrying platform 100, and other structures can be used. Such as: in other embodiments, the rotating device may also adopt a structural form similar to a large-sized bearing, and specifically, the rotating device may include an inner ring and an outer ring which are concentrically arranged and can rotate relative to each other through a roller assembly, the inner ring rotates relative to the outer ring under the driving of a motor, and a fixing ring 430 is arranged on the inner side of the inner ring; the radiation source 510 is directly fixed on the fixing ring 430, a fixing frame 431 is disposed on the fixing ring 430, and the detector plate 520 is fixed on the fixing frame 431.

Referring to fig. 1, in order to supply power quickly and effectively, a slip ring (not shown) is disposed on the rotating frame 420, a contact 421 for connecting with an external power source is disposed on the slip ring, the external power source is connected to the contact 421 of the slip ring, and the slide rail transmits voltage to the rotating frame 420 to supply power to the scanning device. In order to make the structure of the CT scanning imaging system more compact and realize the integration of each function, the scanning device may also be communicatively connected to the data processing center 200 and the control center 300 through the slip ring. In addition, a high voltage generator 422 is further disposed in the fixed ring 430, the high voltage generator 422 is connected to the external power source 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 the scanning operation in a relatively suitable working environment, a heat dissipation module for dissipating heat from the radiation source 510 is disposed in the fixed ring 430. In a preferred embodiment, the high voltage generator 422 and the radiation source heat sink and the radiation source 510 may be integrally provided as a combined radiation source, as desired. In the embodiment shown in fig. 1, the radiation source 510 is a bulb, the bulb is directly fixed on the fixing ring 430, the fixing ring 430 can be driven by the rotating frame 420 to rotate, and the high voltage generator 422 and the heat dissipation module integrated with the bulb are used for generating the high voltage required by the bulb and dissipating heat for the bulb.

In order to facilitate transmission and processing of scanning data, a data wireless transmission module corresponding to the data processing center 200 is disposed on the plate body unit 521 or the daughter board, and the scanning device collects scanning data of the object to be scanned 1000 and directly outputs a data signal to the data processing center 200 through the data wireless transmission module.

In addition, the radiation beam is emitted from the radiation source 510 in a direction controlled by the radiation beam. A beam limiter 511 is arranged at a ray exit position of the ray source 510, and a ray range of the ray source 510 reaching an input surface of the plate unit 521 after passing through the beam limiter 511 is the same as the area of the effective pixel region. In the embodiment shown in fig. 1, the radiation source 510 is a bulb, the beam limiter 511 mounted on the radiation outlet of the bulb is made of lead material, and the radiation outlet of the beam limiter makes the ray field reaching the input surface of the flat panel unit the same size as the input surface of the flat panel unit, thereby reducing the radiation of ineffective rays.

In order to more effectively integrate and apply the scanning data, the fixed ring 430 is further provided with a flat panel detector controller 432 and a data processing module 433, and since signals of the multi-path flat panel unit 521 need to be received uniformly and then packed to be sent, image data generated by the x-ray received by the flat panel unit 521 is processed by the controller and then sent to the data processing module 433 for data processing. The data processing module 433 then transmits the preprocessed data through the wireless transmitting end of the data processing module 433, or may also utilize the power supply and signal channel of the slip ring to realize the transmission of the power supply voltage, the image signal and the control signal. That is, the scanning data of the object 1000 to be scanned acquired by the scanning device is processed by the flat panel detector controller 432 and the data processing module 433 for the first time, and then the data signal is output to the data processing center 200, and after the data processing center 200 performs the second processing, a multi-angle two-dimensional image is generated and a three-dimensional tomographic image is established. The data processing center 200 may be included in the CT scanning imaging system, or may be a data processing center disposed outside the CT scanning imaging system. 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 scanning image data. The data processing center 200 receives the scan data and performs data reconstruction, display, recognition, alarm, and the like.

It should be noted that, as for the reconstruction method of data of the CT scanning imaging system provided by the present invention, generally, there are many cone beam CT reconstruction methods, including an accurate cone beam reconstruction algorithm, an approximate cone beam reconstruction algorithm, an iterative method, and the like. The core content of the invention is that different scanning units are constructed by adding radioactive sources, then different scanning units are arranged according to a certain mode, the purpose of increasing the receiving plate of the detector by two times or more is achieved, simultaneously, the physical interval between the plates is eliminated, the full data coverage of a scanning area is realized, a three-dimensional image with enough information can be reconstructed, and the further automatic identification is realized. So that a multi-panel detector is essentially equivalent to a larger-area detector panel, and the reconstruction thereof can refer to the conventional reconstruction theory and method. Since the more detailed data processing procedures and methods are not the main subject of the present invention, they will not be described herein.

As can be seen from the above, each scanning apparatus in the CT scanning imaging system provided by the present invention may include two or more scanning units 500, each scanning unit 500 further includes a radiation source 510 and a detector board 520 disposed corresponding to the radiation source 510, and the detector board 520 includes one or more board units 521. Each board unit 521 may be formed of a plurality of sub-boards arranged in parallel. With reference to fig. 6 to 9, the following further describes the arrangement manner and the positional relationship of the relative positional relationship between any two scanning units in the same scanning device, in two cases, the arrangement numbers of the plate body units in any two scanning units in the same scanning device are the same or different.

When the number of plate units 521 disposed in any two of the scanning units 500 in the scanning apparatus is the same, as shown in fig. 6 in combination with the embodiment shown in fig. 7, two scanning units in the same scanning apparatus are both composed of one radiation source 510 and a detector plate 520 disposed corresponding to the radiation source 510, and the number of plate units 521 disposed in the detector plate 520 of two scanning units is the same, and is both one. In the contour lines formed by the projections of the ray ranges of the scanning device shown in fig. 7 on the first plane P1 where the centers of the ray source 510 and the plate element 521 are connected, 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 of the plate element 521 on the first plane P1, and the first inscribed circles T1 in any two scanning units coincide with each other.

When the number of the plate body units 521 in any two of the scanning units 500 in the scanning apparatus is different, as shown in fig. 8 in combination with fig. 9, in the embodiment, two scanning units in the same scanning apparatus are both composed of one radiation source 510 and a detector plate 520 disposed corresponding to the radiation source 510, the number of the detector plates 520 of the two scanning units is different, where the number of the plate body units 521 in one detector plate 520 is one, and the number of the plate body units 521 in the other detector plate 520 is two. As shown in fig. 9, a second inscribed circle T2 can be formed between two contour lines located at the outermost side among contour lines formed by the projection of the ray range of the scanning apparatus on the first plane P1 where the centers of the ray source 510 and the plate element 521 are connected, and a contour line formed by the projection of a straight line of one plate element 521 of another scanning element on the first plane P1.

As shown in fig. 10 in combination with fig. 1, an inner protective cover 600 is provided in the CT scanning imaging system to protect an object 1000 to be scanned and prevent other impurities from entering a scanning area, and a space inside the protective cover 600 is the scanning area. Specifically, as shown in fig. 10, 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, 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 (not shown in the figure), the front inner cover plate and the rear inner cover plate are fastened to form an inner protection cover 600 for protecting the object to be scanned, a central symmetry circle of the inner protection cover 600 is disposed at a position corresponding to the first inscribed circle T1 or the second inscribed circle T2, and a diameter of the inner protection cover 600 is slightly smaller than a diameter of the first inscribed circle T1 or the second inscribed circle T2.

Further, in order to facilitate processing and displaying of the scan data, when the scan imaging system fails, an operator is timely reminded of performing emergency processing, and 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 in communication connection with the control center 300.

As shown in fig. 10, for safety, in order to prevent unnecessary radiation leakage, the supporting platform 100 and the scanning device are mounted in a lead box 700 for preventing radiation leakage, an inlet and an outlet for allowing the object to be scanned to enter and exit are opened on the lead box 700, and a lead curtain 710 is provided at the inlet and the outlet for preventing radiation leakage.

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 multiple scanning devices can be sequentially disposed on the same fixed ring 430 without interfering with each other. Of course, it is also possible to provide a plurality of rotating frames 420 capable of rotating synchronously, and fix different scanning devices on the fixing rings 430 correspondingly arranged on each rotating frame 420, respectively, and the arrangement positions of the scanning devices arranged on the different rotating frames 420 should be uniformly distributed in the circumferential direction. In order to effectively distribute the scanning data of different scanning devices in the same scanning imaging system, an encoder for recording the real-time rotation position of the rotating frame 420 is arranged on the rotating frame 420, and the encoder is respectively in communication connection with the data processing center 200 and the control center 300 and records the real-time position of the rotating frame 420 during rotation.

The following describes specific applications, working modes and processes of the CT scanning imaging system provided by the present invention with reference to different embodiments. In the following embodiments, the CT scanning imaging system is used for scanning baggage during security screening.

Specifically, the CT operation can be divided into two modes, one is scanning in a stationary state of the baggage and the other is scanning in a traveling state of the baggage, which are described below.

Scanning of luggage at rest

1. Placing the luggage to be scanned in the effective scanning area;

2. all sources are set to the same appropriate KV and mA, i.e.: the dose is the same, and all the detector plates are set to be the same parameter;

3. starting a motor and driving the rotating frame to rotate;

4. starting rays of the ray source, receiving the x rays by each plate body unit to generate scanning data, and sending the scanning data to the data processing center;

5. the data processing center receives and packages data sent by the plate body units in the detector plates, and sends the data through a wireless terminal or a slip ring signal channel;

6. according to the requirement of image resolution, the rotating frame rotates 180 degrees or one circle and then finishes scanning;

7. and the external image processing system receives the data to complete the processing of noise reduction, reconstruction, automatic identification and the like.

Scanning of luggage in progress

1. Placing the luggage to be scanned outside the effective scanning area;

2. setting all radioactive sources to be the same and proper KV and mA, namely, the doses are the same, and setting all detector boards to be the same parameters;

3. the traveling speed of the carriage platform is set according to the width L of the effective scanning area (i.e., the aforementioned L1, L2, L3). According to the image resolution requirement, the baggage is generally arranged to advance for a distance of L every 180 degrees or one circle of rotation of the rotating frame;

4. starting a motor and driving the rotating frame to rotate;

5. starting rays of the ray source, enabling plate body units in each detector plate to start receiving the x rays, generating scanning data and sending the scanning data to the data processing center;

6. the bearing platform drags the luggage into the scanning area at a constant speed;

7. the data processing center receives and packages data sent by the plate body units in the detector plates, and sends the data through a wireless terminal or a slip ring signal channel;

8. and the external image processing system receives the data and synchronously starts to perform noise reduction, reconstruction, automatic identification and other processing.

Multi-energy spectrum scanning:

the above is a single energy scanning mode, when the system is configured with a dual or multi-scanning device, the dual or multi-energy scanning mode can be performed to obtain higher density contrast, and the following is a specific working process (only scanning in the process of luggage is taken as an example)

1. Placing the luggage to be scanned outside the effective scanning area;

2. setting different KV and mA radioactive sources of different scanning devices, such as 160KV/10mA and 120KV/20mA respectively, wherein KV and mA of all radioactive sources in the same scanning device are required to be the same, and setting the same parameters of a detector board in the same scanning device;

3. determining the traveling speed of the carrying platform according to the width L (i.e. the aforementioned L1, L2, L3) of the effective scanning area of the single system, and setting the traveling speed of the baggage to be L for every 180 degrees or one circle of the rotating frame according to the requirement of image resolution;

4. starting a motor and driving the rotating frame to rotate;

5. starting rays of the ray source, and enabling plate body units in each detector plate to start receiving the X rays to generate scanning data and sending the scanning data to the data processing center;

8. and the external image processing system receives the data, and respectively carries out noise reduction, reconstruction, automatic identification and other processing on the data of the two or more scanning devices to obtain luggage information under different scanning energies and further carry out comprehensive processing.

It can be seen that in the dual or multi-energy scanning mode, the dual or multi-scanning device can complete the scanning at the same speed as the single scanning device.

Horizontal tomography and three-dimensional reconstruction:

this scanning mode is only applicable to all scanning units arranged in parallel, i.e. all sources are arranged on the same line, parallel to the axis of the cylinder of the active scanning area. The plate body units in all the detector plates are assembled in a continuous arc. The specific operation process comprises the following steps:

1. placing the luggage to be scanned outside the effective scanning area;

3. setting the moving speed of the bearing platform according to the resolution requirement of the tomographic image;

4. keeping the rotating frame still;

6. the bearing platform drags the luggage to pass through the scanning area at a constant speed;

8. and after the external image processing system receives the data, overlapping and reconstructing the images of all the horizontal faults to further obtain the three-dimensional image. And further performs data processing such as automatic identification according to the data.

Dual-energy or multi-energy horizontal tomography and three-dimensional reconstruction:

this scanning mode is only applicable to two or more scanning devices in which all the scanning units are arranged in parallel, i.e. all the radiation sources are arranged on the same line, and the line is parallel to the axis of the cylinder of the active scanning area. The plate body units in all the detector plates are assembled in a continuous arc. The specific operation process comprises the following steps:

1. placing the luggage to be scanned outside the effective scanning area;

4. keeping the rotating frame still;

8. after the external image processing system receives the data, the data obtained by different scanning devices are respectively superposed to reconstruct the image of each horizontal fault, and further a three-dimensional image is obtained. And further performs data processing such as automatic identification according to the data.

As can be seen from the above, in the CT scanning imaging system provided by the present invention, when the CT scanning system includes two or more scanning devices configured with the same exposure dose kv and mA, or the flat panel unit of each scanning unit is assembled into two or more, the two or more single scanning devices are substantially operated in synchronization, so as to obtain double or multiple data acquisition amount, thereby improving the resolution of the system. Under the condition of only requiring to reach the system resolution of a single scanning device, the travelling speed of an object to be scanned can be increased by two times or more, then all the scanning devices work in a coordinated mode, and each scanning device can integrate and reconstruct a complete image only by collecting 1/n (n is the set group number of the scanning devices). Therefore, the speed of completing the scanning can be effectively improved. The axial scanning area of the scanning system can be changed to be two times or more than that of a single scanning device and/or a single scanning flat plate unit, the luggage dragging speed of the bearing platform can be improved by two times or more at the moment, and a scanning image with the same resolution can be obtained. When the high luggage dragging speed is not needed, a three-dimensional image with higher resolution can be reconstructed because more volume data are obtained in the same scanning visual field range.

When the scanning device is set to be in parallel configuration with two or more than two scanning units with the same exposure dose kv and mA, namely, the ray sources are on the same axis perpendicular to the scanning section, because the flat panel detectors are in arc continuous arrangement at the moment, the luggage in progress is scanned under the condition that the scanning frame is static, continuous multi-angle two-dimensional images of all luggage in the scanning field can be obtained, and a three-dimensional tomographic image can be reconstructed.

When two or more scanning devices are configured, different scanning devices can be set to different high voltages, the scanning speed cannot be improved at the moment, but CT scanning images with different energy spectrums can be obtained at the same time, and the density sensitivity of the scanned luggage is greatly improved. Different voltages can be used for multi-energy spectrum CT, so that the density resolution of objects in a low-energy area is improved, and the resolution ratio is higher particularly for explosives.

When all the scanning units of two or more scanning devices are arranged in parallel, namely the ray sources are on the same axis vertical to the scanning section, two or more scanning devices are set to different high voltages, the luggage in the process of travelling is scanned under the condition that the scanning frame is static, continuous multi-angle two-dimensional images of different energy spectrums of all the luggage in the scanning field can be obtained, a three-dimensional tomographic image can be reconstructed, and the density attribute of the scanned object can be judged.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, for example, the number of the scanning devices and the flat panel units can be adjusted as required to achieve the best results. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims

1. A CT scanning imaging system mainly comprises a bearing platform (100), a scanning device, a data processing center (200) connected with the scanning device through data signals and a control center (300) communicated with the scanning device through control signals, wherein the scanning device is arranged on the periphery of the bearing platform (100) through a rotating device (400), the CT scanning imaging system is characterized in that the scanning device comprises two or more scanning units (500), each scanning unit (500) comprises a ray source (510) and a detector board (520) arranged corresponding to the ray source (510), and each detector board (520) comprises one or more board body units (521);

the rotating device (400) drives the scanning device to move around the object (1000) to be scanned placed on the bearing platform (100) under the control of the control center (300), the scanning device collects scanning data of the object (1000) to be scanned and outputs a data signal to the data processing center (200), and the data processing center (200) processes the data signal to generate a multi-angle two-dimensional image and establish a three-dimensional tomographic image.

2. The CT scanning imaging system of claim 1, wherein the carrying platform (100) is provided with a motor and a conveying mechanism driven by the motor for placing the object to be scanned (1000) and driving the object to be scanned (1000) to move relative to the carrying platform (100);

or, a slide rail is arranged on the bearing platform (100), the rotating device (400) is arranged on the bearing platform (100) through the slide rail, and the rotating device (400) can move relative to the object to be scanned (1000) placed on the bearing platform (100) through the slide rail.

3. The CT scan imaging system according to claim 1, wherein the plate body unit (521) includes two or more sub-plates, the sub-plates being arranged side by side at the same height position in an axial direction of a maximum ray range of the scanning unit (500), input faces of the two or more sub-plates facing in the same direction; the outer effective edges of the daughter boards at two ends are four sides to form a rectangle, the focus of the radioactive source (510) is positioned on the central axis of the rectangle, and the distance from the focus to the input surface is kept unchanged;

the plate body unit (521) or the daughter board comprises an effective pixel area which is arranged at the center and can receive the rays of the ray source and image, and an invalid frame which is arranged around the periphery of the effective pixel area;

the input surface is a surface of the plate body unit (521) or the daughter board facing the radiation source (510) for receiving the radiation of the radiation source.

4. The CT scanning imaging system of claim 1, wherein the rotating device (400) comprises 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 fixing ring (430), a fixing frame (431) is arranged on the fixing ring (430), and the detector plate (520) is fixed on the fixing frame (431).

5. The CT scanning imaging system of claim 4, 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) drives a synchronous belt or a gear drive through a motor (403), and drives the rotating frame (420) and the fixed ring (430) to rotate synchronously relative to the outer frame (410).

6. The CT scanning imaging system of claim 1, wherein the rotating device (400) comprises an inner ring and an outer ring concentrically arranged and capable of relative rotation by a roller assembly, the inner ring being rotated relative to the outer ring by a motor,

a fixing ring is arranged on the inner side of the inner ring;

7. The CT scanning imaging system of claim 4, wherein the number of the scanning devices is plural, and the plural scanning devices are sequentially arranged on the fixed ring (430).

8. CT scan imaging system according to claim 4, wherein the rotating frame (420) is provided with a slip ring, the slip ring being provided with contacts (511) for connection to an external power supply, the external power supply supplying power to the scanning device via the slip ring;

the scanning device is in communication connection with the data processing center (200) and the control center (300) through the slip ring.

9. The CT scanning imaging system of claim 4, wherein a high voltage generator (422) is arranged in the fixed ring (430), the high voltage generator (422) is connected with the external power supply through the slip ring, and the high voltage generator (422) is connected with the radiation source (510);

and/or a heat dissipation module used for dissipating heat of the ray source (510) is arranged in the fixed ring (430).

10. The CT scanning imaging system of claim 9, wherein the high voltage generator (422) and the source heat sink are integrally provided as a combined source with the source (510).

11. The CT scanning imaging system of claim 3, wherein the plate unit (521) or the daughter board is provided with a data wireless transmission module corresponding to the data processing center (200), and the scanning device collects the 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.

12. The CT scanning imaging system according to claim 3, characterized in that a beam limiter (511) is arranged at a ray exit position of the ray source (510), and a ray range of the ray source (510) reaching the input surface of the plate unit (521) after passing through the beam limiter (511) is the same as the area of the effective pixel region.

13. The CT scanning imaging system of claim 4, wherein a flat panel detector controller (432) and a data processing module (433) are disposed on the fixed ring (430), the scanning data of the object (1000) to be scanned acquired by the scanning device is processed by the flat panel detector controller (432) and the data processing module (433) for one time, and then the data signal is output to the data processing center (200), and after the secondary processing is performed by the data processing center (200), a multi-angle two-dimensional image is generated and a three-dimensional tomographic image is built.

14. The CT scanning imaging system of claim 4, wherein the rotating frame (420) is provided with an encoder for recording the real-time rotating position of the rotating frame (420), and the encoder is respectively connected with the data processing center (200) and the control center (300) in a communication way.

15. The CT scanning imaging system of claim 1, wherein the relative positional relationship of any two scanning units (500) in the scanning apparatus comprises:

when the number of the plate elements (521) in any two scanning units (500) in the scanning device is the same, in the same scanning unit (500) in the same scanning device, one of the outermost contour lines and a contour line formed by the projection of a straight line of the plate element (521) on the first plane (P1) form a first inscribed circle (T1) in a contour line formed by the projection of the central connecting line of the radiation source (510) and the plate element (521) on the first plane (P1), and the first inscribed circles (T1) in any two scanning units (500) are coincident;

when the number of the plate elements (521) in any two scanning units (500) in the same scanning device is different, in any two scanning units (500) in the same scanning device, a second inscribed circle (T2) can be formed between two contour lines positioned on the outermost side and a contour line formed by projection of a straight line of one plate element (521) of the other scanning unit (500) on the first plane (P1) in contour lines formed by projection of the ray range of one scanning unit (500) on the first plane (P1) on which the central connecting lines of the ray source (510) and the plate element (521) are positioned.

16. The CT scanning imaging system of claim 15, wherein 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 plate and the rear inner cover plate are buckled to form an inner protective cover (600) for protecting the object to be scanned, a 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 a diameter of the inner protective cover (600) is less than a diameter of the first inscribed circle (T1) or the second inscribed circle (T2).

17. The CT scanning imaging system of claim 1, wherein the data processing center (200) comprises a data processing unit, an identification unit, a display unit and an alarm unit, each of which is communicatively connected to the control center.

18. The CT scanning imaging system of claim 1, wherein the carrying platform (100) and the scanning device are assembled in a lead box (700) for preventing ray leakage, an inlet and an outlet for the object to be scanned (1000) to enter and exit are opened on the lead box (700), and the inlet and the outlet are provided with a lead curtain (710).