CN210803741U - Dual-energy CT detection system based on novel detection device - Google Patents
Dual-energy CT detection system based on novel detection device Download PDFInfo
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- CN210803741U CN210803741U CN201920388516.6U CN201920388516U CN210803741U CN 210803741 U CN210803741 U CN 210803741U CN 201920388516 U CN201920388516 U CN 201920388516U CN 210803741 U CN210803741 U CN 210803741U
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Abstract
The utility model provides a dual-energy CT detection system based on novel detection device, includes ray source (2), detection device (3), conveyer (4), rotary mechanism (5), structure bed frame (6), through installing traditional dual-energy detection device in low energy detector subassembly (302), high energy detector subassembly (303) of base plate both sides change into homonymy installation, reduced effective signal's loss, changed detection system's device structure, when practicing thrift the cost, promoted detection system's detection performance.
Description
Technical Field
The utility model relates to a dual-energy CT detection system based on novel detection device belongs to safety inspection equipment field.
Background
At present, an X-ray Computed Tomography (CT) technique is widely used in security inspection of baggage or cargo in airports, customs, and the like, and a security inspection CT system can form a three-dimensional image of an object to be inspected, which is more beneficial to accurately judging the object. In recent years, the emerging dual-energy CT technology can also obtain atomic number information of a detected object by special dual-energy system design detection, and can accurately judge drugs and explosives. The general CT system consists of a ray source, a slip ring, a computer, a control system, a conveyor belt, a detection device, a data acquisition system and the like. Wherein the detection means have a significant impact on the performance and cost of the overall CT system.
In traditional dual-energy CT detection system, dual-energy CT detection system comprises low energy detector subassembly, high energy detector subassembly, the filter plate between the two and the installation above subassembly and can be with the base plate PCB who uses printed circuit board as the basis of detecting signal drawing forth, and low energy detector subassembly wherein sets up and is being close to ray source one side and high energy detector subassembly sets up and keeping away from ray source one side, and the filter plate sets up between the two. In the conventional detector structure, because a ray signal needs to pass through the low-energy detector, the PCB and the filter, and a part of the high-energy detector can be really collected by the collecting end, there are many problems, such as additional loss of effective signals caused by the penetration process; the packaging process of the double-layer detector has high difficulty and high cost.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem be: aiming at the problems that effective ray signals can be additionally lost and the packaging cost performance of a double-layer detector is low in the acquisition process of the existing detection system in the prior art, the double-energy CT detection system based on the novel detection device is provided.
The utility model provides an above-mentioned technical problem realize through following technical scheme:
the utility model provides a dual-energy CT detection system based on novel detection device, includes ray source 2, detection device 3, conveyer 4, rotary mechanism 5, structure bed frame 6, rotary mechanism 5 is the ring annular structure, rotary mechanism 5 is installed in 6 intermediate position of structure bed frame, 4 both ends of conveyer link to each other with the roller bearing at 6 both ends of structure bed frame, and 5 planes of perpendicular to rotary mechanism just pass 5 hollow portions of rotary mechanism, ray source 2 installs in 5 homonymies of rotary mechanism with the detection device unit subassembly that a plurality of detection device 3 constitute, and the installation central point puts about conveyer 4 symmetries, wherein:
the detection device 3 comprises a PCB substrate 301, a low-energy detector assembly 302, a high-energy detector assembly 303 and a filter plate 304, wherein the low-energy detector assembly 302 and the high-energy detector assembly 303 are respectively installed on the same side of the PCB substrate 301, the distances between the installation positions and a ray source are the same, and the filter plate 304 is installed on the upper surface of the high-energy detector assembly 303.
The ray source 2 is an X-ray machine or a ray accelerator.
The detection device assembly is arc-shaped.
The rotating mechanism 5 drives the ray source 2 and the detecting device 3 to rotate at a unilateral speed of one circle/second to 6 circles/second.
The low-energy detector assembly 302 and the high-energy detector assembly 303 have the same width and the same or different lengths.
The conveying distance of the conveying device 4 is not more than one half of the larger projection length of the low-energy detector assembly 302 and the high-energy detector assembly 303 when the rotating mechanism 5 rotates for one circle.
The low-energy detector assembly 302 includes a scintillator for converting a radiation signal into visible light, and a photodiode for converting a visible light signal into an electrical signal, wherein the scintillator is made of cesium iodide or cadmium tungstate.
The high-energy detector assembly 303 comprises a scintillator for converting a ray signal into visible light and a photodiode for converting a visible light signal into an electric signal, wherein the scintillator is made of cesium iodide or cadmium tungstate.
The filter 304 is made of aluminum, iron, copper, lead or a combination thereof.
The thickness of the scintillator in the low-energy detector assembly 302 is 0.2-1.5mm, and the thickness of the scintillator in the high-energy detector assembly 303 is 2-5 mm.
Compared with the prior art, the utility model the advantage lie in:
the utility model provides a pair of dual-energy CT detection system based on novel detection device changes traditional double-deck detector subassembly into installing on the base plate, has reduced the loss of effective signal in the detection process, sets up original low energy detector subassembly, the high energy detector subassembly that sets up in the base plate both sides in base plate homonymy both ends simultaneously.
Drawings
Fig. 1 is a schematic structural view of a CT dual-energy system provided by the utility model;
fig. 2 is a schematic structural view of the detecting device provided by the utility model;
FIG. 3 is a schematic view of a plurality of detection devices being spliced together;
Detailed Description
A dual-energy CT detection system based on a novel detection device is shown in figure 2 and comprises a ray source 2, a detection device 3, a conveying device 4, a rotating mechanism 5, a structural base frame 6 and a computer system 7. The ray source 2 is fixed on the rotating mechanism 5 and can be an X-ray machine or an accelerator and other devices which can be driven by electric energy to generate rays; as shown in fig. 3, in a complete dual-energy CT system, a plurality of detecting devices 3 are required to be spliced into a circular arc-shaped detecting device assembly, and are installed on the rotating mechanism 5 opposite to the other side of the radiation source 2; the rotating mechanism 5 is a circular ring structure, can drive the radiation source 2 and the detecting device assembly to rotate at a high speed, and provides reliable signal communication and power supply for all rotating devices; the conveying device 4 can convey the detected object to move along the vertical direction of the rotating plane of the rotating mechanism 5; the computer system 7 can be a computer or a plurality of computer sets, can receive the high-low energy image signals detected by the detection device 3, and can perform three-dimensional reconstruction and high-low energy image fusion processing based on the signals to form dual-energy three-dimensional images for users to interpret dangerous goods or intelligently interpret and alarm, and can also control the whole electromechanical system and be responsible for interaction with the users; the structural base frame 6 provides reliable structural support for all components of the complete machine.
The detection device 3 includes a PCB substrate 301, a low energy detector assembly 302, a high energy detector assembly 303, and a filter 304. As shown in fig. 1, the low energy detector assembly 302 and the high energy detector assembly are arranged on the same side of the PCB substrate 301 and are located at two ends of the whole system in the conveying direction; the low-energy detector assembly 302 consists of a scintillator and a diode, imaging pixels of the low-energy detector assembly can be area array pixels or single-row or multi-row pixels, and the low-energy detector assembly is arranged on the near-ray source side of the PCB substrate 301; the high-energy detector assembly 303 is composed of a scintillating material and a diode, imaging pixels of the high-energy detector assembly 303 can be area array pixels or single-row or multi-row pixels, the high-energy detector assembly 303 and the low-energy detector assembly 302 are arranged on the side of a near-ray source of the PCB substrate 301, the high-energy detector assembly 303 and the low-energy detector assembly are basically the same in width and can be the same or different in length; the filter 304 is disposed above the high-energy detector assembly 303, and is made of a radiation absorbing material, which may be one of aluminum, iron, copper, and lead, or an alloy of at least one of aluminum, iron, copper, and lead.
The high-energy detector assembly 303 and the low-energy detector assembly 302 respectively receive image information of the projection of the object to be detected after being filtered by the filter 304, and transmit the image information to the computer system 7 through the rotating mechanism 5;
meanwhile, the computer system 7 of the system performs three-dimensional reconstruction and high-low energy image fusion according to the image information of the projection of the object to be detected, wherein the three-dimensional reconstruction method adopts an iteration method or a filtering back projection method, the image information of the longer one of the high-energy detector assembly 303 and the low-energy detector assembly 302 is used as a main projection to determine the image resolution of the fused image, the image information of the shorter one is fused into the main projection, and the atomic number and the density of the object to be detected are calculated and displayed by a base material decomposition method or a double-effect resolution method.
The following is further illustrated with reference to specific examples:
in the detection device 3, the selected high-energy detector assembly 303 and the low-energy detector assembly 302 have the length of 300 mm and the width of 80 mm, the rotating speed of the rotating mechanism 5 is 4 circles per second, and the filter 304 is made of tungsten-nickel alloy.
When the dual-energy CT system 1 operates, the ray bundle is continuously emitted from the ray source 2, the rotating mechanism 5 drives the ray source 2 and the detecting device 3 to rotate at a uniform speed along a single direction, and the rotating speed is generally 1 to 6 circles/second. Meanwhile, the conveying device 4 drives the object to be detected to move along the vertical direction of the rotation plane of the rotating mechanism 5 and pass through the center of the rotation plane, the speed V of the conveying device 4 is related to the length L of the longer one of the high-energy detector assembly 303 and the low-energy detector assembly 302 in the detector device 3, and theoretically, the moving distance of the conveying device 4 in each rotation of the rotating mechanism 5 should not exceed one half of the projection distance covered by L. When the projection of the detected object enters the coverage area of the detection device 3, the high-energy detector assembly 303 and the low-energy detector assembly 302 respectively receive the image information of the projection, the information can be transmitted to the computer system 7 through the rotating mechanism 5, and three-dimensional reconstruction and high-low energy image fusion are performed, wherein the three-dimensional reconstruction method can be an iteration method or a filtering back projection method, and the like, at this time, the image information of the longer one of the high-energy detector assembly 303 and the low-energy detector assembly 302 is used as a main projection to determine the image resolution of the fused image, the image information of the shorter one is fused into the main projection, the atomic number and the density of the detected object are accurately calculated through a dual-energy image processing algorithm such as a decomposition-based material method or a double-effect decomposition method, and the atomic number and the density of the. It should be noted that, when the high-energy image information and the low-energy image information are fused, the imaging distance between the high-energy detector assembly 303 and the low-energy detector assembly 302 needs to be measured, because the detection of the same position of the object to be detected by the two assemblies does not occur simultaneously.
After obtaining the dual-energy three-dimensional image, the user may interact with the computer system 7 to perform operations such as cutting, counting, viewing slices, changing transparency and dyeing on the image; and a dangerous article automatic identification technology based on artificial intelligence can be used, so that the computer system 7 can intelligently identify the images, and the dangerous article interpretation speed and the artificial efficiency are improved.
The details of the present invention not described in detail in the specification are well known to those skilled in the art.
Claims (10)
1. The utility model provides a dual energy CT detecting system based on novel detecting device which characterized in that: including ray source (2), detection device (3), conveyer (4), rotary mechanism (5), structure bed frame (6), rotary mechanism (5) are the ring annular structure, rotary mechanism (5) are installed in structure bed frame (6) intermediate position, conveyer (4) both ends link to each other with the roller bearing at structure bed frame (6) both ends, and perpendicular to rotary mechanism (5) plane just passes rotary mechanism (5) hollow portion, the detection device subassembly that ray source (2) and a plurality of detection device (3) are constituteed is installed in rotary mechanism (5) homonymy, and installation central point puts about conveyer (4) symmetry, wherein:
the detection device (3) comprises a PCB substrate (301), a low-energy detector assembly (302), a high-energy detector assembly (303) and a filter (304), wherein the low-energy detector assembly (302) and the high-energy detector assembly (303) are respectively installed on the same side of the PCB substrate (301), the distance between the installation position and a ray source is the same, and the filter (304) is installed on the upper surface of the high-energy detector assembly (303).
2. The dual-energy CT detection system based on the novel detection device as claimed in claim 1, wherein: the ray source (2) is an X-ray machine or a ray accelerator.
3. The dual-energy CT detection system based on the novel detection device as claimed in claim 1, wherein: the detection device assembly is arc-shaped.
4. The dual-energy CT detection system based on the novel detection device as claimed in claim 1, wherein: the rotating mechanism (5) drives the ray source (2) and the detecting device (3) to rotate at a unilateral speed of one circle/second to 6 circles/second.
5. The dual-energy CT detection system based on the novel detection device as claimed in claim 1, wherein: the low-energy detector assembly (302) and the high-energy detector assembly (303) have the same width and the same or different lengths.
6. The dual-energy CT detection system based on the novel detection device as claimed in claim 1, wherein: the conveying distance of the conveying device (4) is not more than one half of the larger projection length of the low-energy detector assembly (302) and the high-energy detector assembly (303) when the rotating mechanism (5) rotates for one circle.
7. The dual-energy CT detection system based on the novel detection device as claimed in claim 1, wherein: the low-energy detector assembly (302) comprises a scintillator for converting a ray signal into visible light and a photodiode for converting a visible light signal into an electric signal, wherein the scintillator is made of cesium iodide or cadmium tungstate.
8. The dual-energy CT detection system based on the novel detection device as claimed in claim 1, wherein: the high-energy detector assembly (303) comprises a scintillator for converting a ray signal into visible light and a photodiode for converting a visible light signal into an electric signal, wherein the scintillator is made of cesium iodide or cadmium tungstate.
9. The dual-energy CT detection system based on the novel detection device as claimed in claim 1, wherein: the filter (304) is made of aluminum, iron, copper, lead or a combination thereof.
10. The dual-energy CT detection system based on the novel detection device as claimed in claim 1, wherein: the thickness of a scintillator in the low-energy detector assembly (302) is 0.2-1.5mm, and the thickness of the scintillator in the high-energy detector assembly (303) is 2-5 mm.
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| CN201920388516.6U CN210803741U (en) | 2019-03-25 | 2019-03-25 | Dual-energy CT detection system based on novel detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116046815A (en) * | 2023-02-21 | 2023-05-02 | 上海福柯斯智能科技有限公司 | Dual-energy CT imaging method, device and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116046815A (en) * | 2023-02-21 | 2023-05-02 | 上海福柯斯智能科技有限公司 | Dual-energy CT imaging method, device and system |
| CN116046815B (en) * | 2023-02-21 | 2023-11-03 | 上海福柯斯智能科技有限公司 | Dual-energy CT imaging method, device and system |
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