CN210294115U - CT detection device and system - Google Patents
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- CN210294115U CN210294115U CN201920288898.5U CN201920288898U CN210294115U CN 210294115 U CN210294115 U CN 210294115U CN 201920288898 U CN201920288898 U CN 201920288898U CN 210294115 U CN210294115 U CN 210294115U
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Abstract
The utility model discloses a CT detection device and a system, wherein, the device comprises a ray source, a rotating disk and a CT detector; the CT detector comprises N detection plates; the ray source is arranged at one end of the rotating disk; the N detection plates are arranged at the other end of the rotating disk, and a connecting line of a central point of an imaging area of each detection plate and a ray source focus of a ray source is vertical to the outer surface where the central point of the imaging area of each detection plate is located; the central detection plate is used as a reference, and the rest detection plates are symmetrically distributed along the connecting line of the central point of the imaging area of the central detection plate and the focal point of the ray source. The utility model discloses from the angle consideration of rebuilding the algorithm, realize the problem based on spiral scanning T-FDK algorithm (herein be abbreviated as ST-FDK) data complete utilization to realize the miniaturized problem of equipment.
Description
Technical Field
The utility model belongs to the technical field of the safety inspection, especially, relate to a CT detection device and system.
Background
Among X-ray-based explosive inspection technologies, X-ray computed tomography imaging (CT) technology has been highly regarded in the field of security inspection because of its own unique advantages. The eds (explicit Detection system) type security inspection equipment uniquely certified by the Federal Aviation Administration (FAA) in the united states is CT equipment, and the position of the X-ray CT technology in the field of security inspection is known.
The X-ray CT security inspection technology is used for reconstructing CT projection data to obtain a tomographic image of a scanned object, and analyzing characteristic data in the tomographic image to realize identification of dangerous goods in the scanned object.
In a conventional CT apparatus, the detector devices are distributed as shown in fig. 1, where 1 is a radiation source, 2 is a rotatable disk surface supporting the radiation source and the detector, and 3 is the detector. The method is characterized in that: the detectors are continuously arranged and distributed in the same standard circumference taking the target point of the ray source as the circle center, so that the dosage ranges of the X-ray beams received by the detector parts are similar in the same time, the workload of subsequent algorithm processing can be reduced, the spatial resolution of the center and the edge in the same tomographic image are similar, and in addition, the standard reconstruction algorithm of a standard arc-shaped detector can be adopted. However, the size of the device in such a layout mode is relatively large, which results in a much larger floor space than that of a conventional security check machine, which is one of the key factors limiting the application of X-ray CT security check devices in the security check field, especially for CT devices for hand-held baggage inspection, the field is sensitive to the size of the device, so it is necessary to design a miniaturized CT device, and the key point of miniaturization lies in the light path layout design of CT.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem be: the defects of the prior art are overcome, and a CT detection device and a CT detection system are provided, so that the problem of complete utilization of data based on a helical scanning T-FDK algorithm (ST-FDK for short) is solved from the perspective of a reconstruction algorithm, and the problem of equipment miniaturization is solved.
The utility model discloses the purpose is realized through following technical scheme: a CT detection apparatus, comprising: the device comprises a ray source, a rotating disk and a CT detector; the CT detector comprises N detection plates; the ray source is arranged at one end of the rotating disk; the N detection plates are arranged at the other end of the rotating disk, and a connecting line of a central point of an imaging area of each detection plate and a ray source focus of a ray source is vertical to the outer surface where the central point of the imaging area of each detection plate is located; the central detection plate is used as a reference, and the rest detection plates are symmetrically distributed along the connecting line of the central point of the imaging area of the central detection plate and the focal point of the ray source.
In the CT detecting apparatus, a connecting line between the central point of the imaging region of the central detecting plate and the central point of the imaging region of each of the other detecting plates is perpendicular to a connecting line between the central point of the imaging region of each of the other detecting plates and the focal point of the radiation source.
In the CT detection device, the included angle gamma between the connecting line of the central point of the imaging region of the central detection plate and the focal point of the ray source and the connecting line of the central point of the imaging region of the second detection plate on the left and the focal point of the ray source1Obtained by the following formula:
wherein, β1The included angle between the connecting line of the left boundary point of the central detector and the focal point of the ray source and the connecting line of the central point of the imaging area of the central detection plate and the focal point of the ray source, L is the width dimension of the detection plate, and the left detection plate adjacent to the central detection plate is defined as a second detection plate on the left.
In the CT detection device, the included angle gamma between the connecting line of the central point of the imaging area of the central detection plate and the focal point of the ray source and the connecting line of the central point of the imaging area of the kth detection plate on the left side and the focal point of the ray sourcekObtained by the following formula:
wherein, βkIs the included angle between the connecting line of the left boundary of the kth detector on the left and the focal point of a ray source and the connecting line of the central point of the imaging area of a central detecting plate and the focal point of the ray source,
β in the CT detectorkAnd βk-1The following equation:
βk＝2*γk-1-βk-1，
wherein, βk-1The included angle between the connecting line of the left boundary of the kth-1 left detector and the focal point of a ray source and the connecting line of the central point of the imaging area of a central detection plate and the focal point of the ray source is gammak-1Is an included angle between the connecting line of the central point of the imaging area of the central detection plate and the focal point of the ray source and the connecting line of the central point of the imaging area of the (k-1) th detection plate on the left side and the focal point of the ray source,
in the above CT detection apparatus, the radiation source is a CT radiation source.
A CT system, comprising: the system comprises a CT detection device, a conveyor belt, a data processing computer, a conveyor belt motor, a slip ring motor and a motion control computer; the CT detection device comprises a ray source, a rotating disk and a CT detector; the radiation source and the CT detector are arranged on the rotating disk, the CT detector is connected with the data processing computer, and the conveyer belt motor and the slip ring motor are both connected with the motion control computer; the motion control computer controls the conveyor belt motor to drive the conveyor belt to move at a constant speed, and controls the slip ring motor to rotate at a constant speed; the detected object is placed on the conveyor belt, the conveyor belt drives the detected object to enter the detection channel, and the rotating disc rotates around the conveyor belt at a constant speed; the ray source emits rays, the CT detector receives ray photon signals from the CT ray source, and the data processing computer completes the acquisition and storage of CT projection data and all data processing.
Compared with the prior art, the utility model following beneficial effect has:
the utility model provides an except considering based on compact structure design, still based on complete utilization of projection data and the improvement of rebuilding algorithm, well-known, circular orbit's T-FDK rebuilds algorithm, data have some data to abandon after rearranging and do not use. And adopt the light path overall arrangement that utility model provided, when utilizing T-FDK to rebuild the algorithm, the projection data that the detector gathered still can utilize completely. This conclusion is equally applicable to the spiral track T-FDK, ST-FDK reconstruction algorithm.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic diagram of a prior art detector arrangement;
fig. 2 is a schematic structural diagram of a CT detection apparatus provided in an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a positional relationship between N detection plates and a focal point of a radiation source according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of fan beam rearrangement provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram of Cone-parallel rearrangement provided by an embodiment of the present invention;
fig. 6 is a top view of a rearrangement geometry provided by an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a CT system according to an embodiment of the present invention;
fig. 8 is another schematic structural diagram of a CT detection apparatus according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Fig. 2 is a schematic structural diagram of a CT detection apparatus provided in an embodiment of the present invention; fig. 3 is a schematic diagram of a positional relationship between N detection plates and a focal point of a radiation source according to an embodiment of the present invention. As shown in fig. 2 and 3, the CT detecting apparatus includes: a radiation source 1, a rotating disk 2 and a CT detector 3.
Wherein, the CT detector 3 includes N detection plates; each detection plate has its own corresponding imaging area center point 5.
The radiation source 1 is arranged at one end of the rotating disc 2. The rotating disc 2 comprises a centre of rotation 4.
The N detection plates are arranged at the other end of the rotating disk 2, and a connecting line of a central point of an imaging area of each detection plate and a radiation source focus 7 of the radiation source 1 is vertical to the outer surface where the central point of the imaging area of each detection plate is located; the central detection plate 8 is used as a reference, and the rest detection plates are symmetrically distributed along the connecting line of the central point of the imaging area of the central detection plate 8 and the focal point 7 of the ray source. Specifically, the N detection plates include a central detection plate 8 and the remaining detection plates, and the number of the detection plates located on the left side of the central detection plate 8 is
The number of the detection plates positioned on the right side of the central detection plate 8 is
The connecting line of the central point of the imaging area of the central detection plate 8 and the central point of the imaging area of each of the other detection plates is vertical to the connecting line of the central point of the imaging area of each of the other corresponding detection plates and the focal point 7 of the ray source. Specifically, as shown in fig. 3, a connection line between the central point of the imaging region of the central detection plate 8 and the central point of the imaging region of the left second detection plate 9 is perpendicular to a connection line between the central point of the imaging region of the left second detection plate 9 and the radiation source focal point 7. The connecting line of the central point of the imaging area of the central detection plate 8 and the central point of the imaging area of the left third detection plate 10 is perpendicular to the connecting line of the central point of the imaging area of the left third detection plate 10 and the focal point 7 of the ray source. The connecting line of the central point of the imaging area of the central detection plate 8 and the central point of the imaging area of the kth detection plate 11 on the left is vertical to the connecting line of the central point of the imaging area of the kth detection plate 11 on the left and the focal point 7 of the ray source. The connecting line of the central point of the imaging area of the central detection plate 8 and the central point of the imaging area of the right second detection plate 12 is vertical to the connecting line of the central point of the imaging area of the right second detection plate 12 and the focal point 7 of the ray source. The connecting line of the central point of the imaging area of the central detection plate 8 and the central point of the imaging area of the right third detection plate 13 is vertical to the connecting line of the central point of the imaging area of the right third detection plate 13 and the focal point 7 of the ray source. The connecting line of the central point of the imaging area of the central detection plate 8 and the central point of the imaging area of the kth detection plate 14 on the right is vertical to the connecting line of the central point of the imaging area of the kth detection plate 14 on the right and the focal point 7 of the ray source.
The distance from the central point of the imaging area of each detector plate to the focal point 7 of the ray source is in direct proportion to the cosine value of the included angle between the connecting line of the central point of the imaging area of the detector plate and the focal point 1 of the ray source and the connecting line of the central point of the imaging area of the central detection plate 8 and the focal point 7 of the ray source (namely along the direction of the central beam 6).
As shown in FIG. 3, the angle γ between the central point of the imaging area of the central detection plate 8 and the line connecting the focal point 7 of the radiation source and the central point of the imaging area of the second detection plate 9 on the left and the line connecting the focal point 7 of the radiation source1Obtained by the following formula:
wherein, β1Is the angle between the connecting line of the left boundary of the central detector and the radiation source focal point 7 and the connecting line of the imaging area central point of the central detection plate 8 and the radiation source focal point 7, L is the width dimension of the detection plate, and the left detection plate adjacent to the central detection plate 8 is defined as the second detection plate 9 on the left.
The included angle gamma between the connecting line of the central point of the imaging area of the central detection plate 8 and the radiation source focal point 7 and the connecting line of the central point of the imaging area of the kth detection plate 11 on the left and the radiation source focal point 7kObtained by the following formula:
wherein, βkIs the included angle between the connecting line of the left boundary of the kth detector on the left and the radiation source focal point 7 and the connecting line of the central point of the imaging area of the central detection plate 8 and the radiation source focal point 7,
βkand βk-1The following equation:
βk＝2*γk-1-βk-1，
wherein, βk-1Is the included angle between the connecting line of the left boundary of the (k-1) th detector on the left and the radiation source focal point 7 and the connecting line of the central point of the imaging area of the central detection plate 8 and the radiation source focal point 7, gammak-1Is the included angle between the connecting line of the central point of the imaging area of the central detecting plate 8 and the focal point 7 of the ray source and the connecting line of the central point of the imaging area of the kth-1 th detecting plate on the left and the focal point 7 of the ray source,
helical cone-beam scanning is the most common scanning mode in current commercial security inspection CT, and the most common reconstruction algorithm at present is still an analytic approximation reconstruction algorithm. Representative of these algorithms are the spiral FDK algorithm and the modified FDK algorithm, which may be collectively referred to as FDK-based algorithm. Under circular orbit scanning conditions, T-FDK is a classic improved algorithm in FDK algorithm, and the step of the T-FDK algorithm is to firstly carry out rearrangement of projection data from cone beam to oblique parallel beam, as shown in the following figures 4 and 5. The rearranged data is projected onto a rotation center virtual detector like a tent. FIG. 6 is a top view of a rearrangement geometry.
The cone beam rearrangement process is similar to the fan beam rearrangement into parallel beams, as shown in fig. 4 and 5, and the rearrangement formula is as follows:
(θ, t) are coordinates in parallel beam geometry and (β, γ) are coordinates in fan-beam and cone-beam geometry.
For the cone beam rearrangement process, the rearrangement formula is as follows:
the relationship between the height of the two sides of the "tent" and the intermediate height can be found as follows:
wherein gamma is the included angle between the rearranged parallel ray beam and the central ray beam before rearrangement. As described above, the rearranged data is projected onto the virtual detector at the rotation center position like a tent shape. When the filtering back projection algorithm is adopted for reconstruction, the filtering direction is the horizontal direction, and part of data needs to be omitted, so that the improvement of the quality of a reconstructed image and the improvement of the signal to noise ratio of the image are not facilitated, and the projection data on detection are fully utilized. The light path layout of the detector designed by the patent is not on a standard arc, and the distance from the central point of the imaging area of each detection plate to the focal point of a ray source is in direct proportion to the cosine value of the included angle between the connecting line of the central point of the imaging area of the detector plate and the focal point of the ray source and a central beam. This is the design idea of this patent.
Preferably, see FIG. 3, a side view along the direction of conveyor motion, let the left boundary of the central probe plate be β degrees from the central beam1The left boundary of the adjacent left second detection plate forms an angle of β with the central beam2By analogy, the left boundary of the adjacent left third detection plate forms an angle β with the central beam3Left of the adjacent left kth block probe plateThe boundary and central ray beam have an included angle of βk. The focal point of the radiation source is 7, the central detection plate (here, the first detection plate is defined), the left second detection plate is 9, the left third detection plate is 10, the left kth detection plate is 11, the right second detection plate is 12, the right third detection plate is 13, and the right kth detection plate is 14.
Fig. 7 is a schematic structural diagram of a CT system according to an embodiment of the present invention. As shown in FIG. 7, the CT system includes CT detection devices, a conveyor 50, a data processing computer 90, a conveyor motor 60, a slip ring motor 80, and a motion control computer 70. Wherein,
the CT detection device comprises a ray source 1, a rotating disk 2 and a CT detector 3;
the radiation source 1 and the CT detector 3 are arranged on the rotating disk 2, the CT detector 3 is connected with the data processing computer 90, and the conveyor belt motor 60 and the slip ring motor 80 are both connected with the motion control computer 70;
the motion control computer 70 controls the conveyor belt motor 60 to drive the conveyor belt to move at a constant speed, and the motion control computer 70 controls the slip ring motor 80 to rotate at a constant speed;
the detected object 40 is placed on the conveyor belt 50, the conveyor belt 50 drives the detected object 40 to enter the detection channel, and the rotating disc 2 rotates around the conveyor belt at a constant speed;
the ray source 1 emits rays, the CT detector 3 receives ray photon signals from the CT ray source 1, and the data processing computer 90 finishes the acquisition and storage of CT projection data and all data processing work.
This embodiment proposes to fully utilize projection data and to improve the reconstruction algorithm based on compact design considerations, and it is known that in the circular orbit T-FDK reconstruction algorithm, a part of the data is discarded after the data rearrangement. By adopting the light path layout provided by the embodiment, the projection data acquired by the detector can still be fully utilized when the T-FDK reconstruction algorithm is utilized. This conclusion can be generalized to helical scan reconstruction.
Fig. 8 shows another preferred embodiment, in the layout shown in fig. 8, the central beam is located in the middle of the two middle detection plates, in which case the total number of detection plates is even, and likewise, the distance from the central point of the imaging area of each detection plate to the focal point of the radiation source is proportional to the cosine of the angle formed by the connecting line of the central point of the imaging area of the detection plate and the focal point of the radiation source and the central beam. Those skilled in the art will recognize that such an arrangement is also within the scope of this patent.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the ordinary changes and replacements within the technical solution of the present invention should be covered by the protection scope of the present invention.
Claims (7)
1. A CT detection apparatus, comprising: the device comprises a ray source (1), a rotating disk (2) and a CT detector (3); wherein,
the CT detector (3) comprises N detection plates;
the ray source (1) is arranged at one end of the rotating disk (2);
the N detection plates are arranged at the other end of the rotating disk (2), and a connecting line of a central point of an imaging area of each detection plate and a ray source focus (7) of the ray source (1) is vertical to the outer surface where the central point of the imaging area of each detection plate is located; the central detection plate (8) is taken as a reference, and the rest detection plates are symmetrically distributed along the connecting line of the central point of the imaging area of the central detection plate (8) and the focal point (7) of the ray source.
2. The CT detection apparatus of claim 1, wherein: the connecting line of the central point of the imaging area of the central detection plate (8) and the central point of the imaging area of each of the other detection plates is vertical to the connecting line of the central point of the imaging area of each of the other corresponding detection plates and the focal point (7) of the ray source.
3. The CT detection apparatus of claim 1, wherein: the included angle gamma between the connecting line of the central point of the imaging area of the central detection plate (8) and the focal point (7) of the ray source and the connecting line of the central point of the imaging area of the second detection plate (9) on the left and the focal point (7) of the ray source1Obtained by the following formula:
wherein, β1The included angle between the connecting line of the left boundary point of the central detector and the ray source focal point (7) and the connecting line of the central point of the imaging area of the central detection plate (8) and the ray source focal point (7), L is the width dimension of the detection plate, and the left detection plate adjacent to the central detection plate (8) is defined as a second detection plate (9) on the left.
4. The CT detection apparatus of claim 1, wherein: an included angle gamma between a connecting line of a central point of an imaging area of the central detection plate (8) and the radiation source focal point (7) and a connecting line of a central point of an imaging area of the kth detection plate (11) on the left and the radiation source focal point (7)kObtained by the following formula:
wherein, βkThe included angle between the connecting line of the left boundary point of the kth detector on the left and the radiation source focal point (7) and the connecting line of the central point of the imaging area of the central detection plate (8) and the radiation source focal point (7) is shown as k, 2,3,4 …,
5. the CT detection device of claim 4, wherein βkAnd βk-1The following equation:
βk＝2*γk-1-βk-1，
wherein, βk-1The included angle between the connecting line of the left boundary point of the kth-1 left detector and the ray source focal point (7) and the connecting line of the central point of the imaging area of the central detection plate (8) and the ray source focal point (7) is gammak-1Imaging of the line connecting the central point of the imaging area of the central detection plate (8) and the focal point (7) of the ray source and the (k-1) th detection plate on the left sideThe angle between the central point of the region and the line connecting the focal points (7) of the ray sources, k being 2,3,4 …,
6. the CT detection apparatus of claim 1, wherein: the ray source (1) is a CT ray source.
7. A CT system, comprising: the CT detection device of any of claims 1 to 6, a conveyor belt (50), a data processing computer (90), a conveyor belt motor (60), a slip ring motor (80), and a motion control computer (70); wherein,
the CT detection device comprises a ray source (1), a rotating disk (2) and a CT detector (3);
the ray source (1) and the CT detector (3) are arranged on the rotating disk (2), the CT detector (3) is connected with a data processing computer (90), and the conveyer belt motor (60) and the slip ring motor (80) are both connected with the motion control computer (70);
the motion control computer (70) controls the conveyor belt motor (60) to drive the conveyor belt to move at a constant speed, and the motion control computer (70) controls the slip ring motor (80) to rotate at a constant speed;
the detected object (40) is placed on the conveyor belt (50), the conveyor belt (50) drives the detected object (40) to enter the detection channel, and the rotating disc (2) rotates around the conveyor belt at a constant speed;
the ray source (1) emits rays, the CT detector (3) receives ray photon signals from the CT ray source (1), and the data processing computer (90) finishes the acquisition and storage of CT projection data and all data processing work.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109738465A (en) * | 2019-03-07 | 2019-05-10 | 北京航星机器制造有限公司 | A kind of CT detection device and system |
| CN114047209A (en) * | 2021-12-24 | 2022-02-15 | 北京航星机器制造有限公司 | Distributed static CT system and imaging method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109738465A (en) * | 2019-03-07 | 2019-05-10 | 北京航星机器制造有限公司 | A kind of CT detection device and system |
| CN109738465B (en) * | 2019-03-07 | 2024-10-22 | 北京航星机器制造有限公司 | CT detection device and system |
| CN114047209A (en) * | 2021-12-24 | 2022-02-15 | 北京航星机器制造有限公司 | Distributed static CT system and imaging method |
| CN114047209B (en) * | 2021-12-24 | 2024-05-14 | 北京航星机器制造有限公司 | Distributed static CT system and imaging method |
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