CN217820095U

CN217820095U - Multi-view static CT device

Info

Publication number: CN217820095U
Application number: CN202220014226.7U
Authority: CN
Inventors: 李保磊; 魏增辉; 孙翠丽; 韩毅; 莫阳; 牛素鋆; 徐圆飞
Original assignee: Beijing Hangxing Machinery Manufacturing Co Ltd
Current assignee: Beijing Hangxing Machinery Manufacturing Co Ltd
Priority date: 2022-01-04
Filing date: 2022-01-04
Publication date: 2022-11-15
Anticipated expiration: 2032-01-04

Abstract

The utility model relates to a static CT device of multi-view belongs to radiation imaging technical field, has solved current static CT equipment and need increase extra weight load in order to keep overall stability, leads to equipment heavy and the too big problem of volume. A multi-view static CT device comprises imaging units with different views, wherein the imaging units are arranged along the conveying direction of an object; the imaging unit comprises a ray source and a detector assembly, and the detector assembly and the ray source are correspondingly arranged. The utility model discloses a set up the imaging unit at different visual angles on object direction of delivery to with the imaging unit setting in transfer passage's periphery, can make the object accomplish static scanning formation of image simultaneously at transfer passage's the in-process of marcing, guarantee the CT formation of image of object on different visual angles.

Description

Multi-view static CT device

Technical Field

The utility model relates to a radiation imaging technology field especially relates to a static CT device of many visual angles.

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 current security inspection CT equipment is mainly divided into spiral CT equipment and static CT equipment based on a slip ring technology. Helical CT devices typically arrange the source and detector on a rotating gantry, and solve the problem of continuous gantry rotation through slip ring technology. Since the centrifugal forces to which the components are subjected increase with the square of the rotational speed, an increase in the scanning speed places high demands on the performance of the gantry. In addition, the angle precision and the position precision of the stand during the rotation process have great influence on the imaging quality. This results in high machining accuracy, high cost of the whole apparatus, and difficulty in realizing high-speed imaging with a large aperture.

The static CT device adopts the mode that a ray source and a detector are static and do not rotate in the scanning process. Therefore, compared with spiral CT, the method has the advantages of high scanning speed, low cost and the like, and has important significance in safety inspection and medical imaging.

Existing static CT devices are based on mechanical design, geometric correction, imaging parameter measurement and simplicity of the reconstruction algorithm, and usually employ the arrangement of the radiation source and the detector on a ring-shaped frame surrounding the object, however, the detector and the radiation source are removed, the frame is mostly free, and additional weight load is required to maintain the overall stability of the device, resulting in a heavy and bulky device.

SUMMERY OF THE UTILITY MODEL

In view of the foregoing analysis, the present invention is directed to a multi-view static CT apparatus for solving the problem that the existing static CT apparatus needs to add extra weight load to maintain overall stability, resulting in heavy and bulky apparatus.

The purpose of the utility model is realized mainly through the following technical scheme:

a multi-view static CT device comprises imaging units with different views, wherein the imaging units are arranged along the conveying direction of an object; the imaging unit comprises a ray source and a detector assembly, and the detector assembly and the ray source are correspondingly arranged.

Optionally, the detector assembly includes a plurality of sets of detectors, and the arrangement of the detectors includes a U shape, an L shape, and an arc shape.

Optionally, the different viewing angles include two or more of a low viewing angle, a top viewing angle, a side viewing angle, and a diagonal viewing angle.

Optionally, the arrangement sequence of the imaging units with different viewing angles along the conveying direction of the object is a low viewing angle, a side viewing angle, a top viewing angle and a diagonal viewing angle.

Optionally, the radiation source includes a plurality of radiation source focuses, and adjacent radiation source focuses are arranged at equal intervals or at unequal intervals; the detector assembly comprises a single-row detector or a multi-row detector opposite to the ray source, and the detector comprises one or more of a single-energy detector, a double-energy detector and a photon counting detector.

Optionally, a conveying channel is further included, in which the objects pass.

Optionally, in the imaging unit of each view angle, the radiation source and the detector are located on the same imaging plane, and the imaging plane is perpendicular to the conveying direction of the object or is arranged obliquely with respect to the conveying direction of the object.

Optionally, in the low-view imaging unit, the radiation source is located at the bottom of the conveying channel.

Optionally, in a top view imaging unit, the source of radiation is located at the top of the conveyor channel.

Optionally, in the side-view imaging unit, the source of radiation is located at a side of the conveyor path.

Optionally, in the imaging unit with diagonal viewing angle, the radiation sources are located on two adjacent faces of the conveying channel.

Compared with the prior art, the utility model discloses can realize one of following beneficial effect at least:

(1) Existing static CT systems are based on mechanical design, geometric correction, imaging parameter measurement and simplicity of the reconstruction algorithm, and typically employ the placement of the source and detector on a ring-shaped frame around the object, however, the removal of the detector and source leaves much of the frame free, and additional weight loading is required to maintain the overall stability of the apparatus, resulting in a heavy and bulky apparatus. The utility model discloses through simply arranging the imaging unit that can acquire projection data under a plurality of visual angles at the periphery of the conveying channel, on one hand, the requirement of acquiring projection data under a plurality of visual angles of an object is satisfied; on the other hand, no additional weight load needs to be added in order to maintain the overall stability of the device. Therefore, the static CT system of the utility model has simple structure, light weight and small volume.

Additionally, the utility model discloses a static CT system is different from multi-view security check machine, can acquire a plurality of projection data under a plurality of visual angles through multi focus source, not only is the DR image under a plurality of visual angles to acquire the three-dimensional information of scanning object through the reconstruction algorithm.

(2) The utility model discloses a plurality of ray sources that the dispersion set up can gather the DR image under the different visual angles when single ray source opens, can acquire the DR image of object under a plurality of visual angles through a plurality of imaging unit, combines CT equipment to the control of every ray source of imaging unit, and the image that will gather is rebuild and is integrated, can obtain good CT and rebuild the result.

(3) The scattered ray source of laying and the detector that corresponds with the ray source have effectively simplified equipment structure, have reduced CT imaging device's equipment cost, through the static scanning at the object in-process of marcing, can in time know the form of scanning the object through the DR image that the in-process obtained of marcing, have avoided whole just can obtain the scanning result of object after passing through, have effectively realized prejudge locking and quick formation of image scanning.

(4) The utility model discloses a set up different imaging unit's mode to structural style (linear type, broken line type) and the position of laying (the bottom of object, top and lateral part) through adopting specific ray source, and rather than the structural style of corresponding detector (like U-shaped, L shape or other forms), can select the type and the combination of the imaging unit who uses in a flexible way as required, realize the scanning to the different visual angles of object.

The utility model discloses in, can also make up each other between the above-mentioned each technical scheme to realize more preferred combination scheme. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention.

Drawings

The drawings, in which like reference numerals refer to like parts throughout, are for the purpose of illustrating particular embodiments only and are not to be considered limiting of the invention.

Fig. 1 is a schematic structural view of a low-viewing-angle imaging unit in embodiment 1;

fig. 2 is a schematic structural view of a top-view angle imaging unit in embodiment 2;

FIG. 3 is a schematic structural diagram of a side view angle imaging unit in embodiment 3;

FIG. 4 is a schematic structural diagram of an imaging unit with a diagonal viewing angle in embodiment 4;

fig. 5 is a schematic structural diagram of a multi-view static CT apparatus in embodiment 5.

Reference numerals:

1-a delivery channel;

2-a ray source;

3-a detector.

Detailed Description

The following detailed description of the preferred embodiments of the invention, which is to be read in connection with the accompanying drawings, forms a part of the invention, and together with the embodiments of the invention, serve to explain the principles of the invention and not to limit the scope of the invention.

The utility model discloses a concrete embodiment discloses a static CT device of many visual angles, include: a delivery channel; a plurality of imaging units with different viewing angles are arranged along the conveying direction of the object, and the imaging units are arranged on the periphery of the conveying channel; each imaging unit comprises a plurality of scattered ray sources and a detector which corresponds to the ray sources.

The utility model provides a static CT device of multi-view mainly is applied to static CT equipment on, specifically scans the object of marcing on transfer passage through the mode of static formation of image.

The static CT equipment comprises a multi-view static CT device and an object conveying component of a common CT device, wherein the object travels on a conveying channel formed by the conveying component and is scanned in the traveling process. The object conveying part comprises a moving motor and a conveying belt in security inspection CT or a moving motor and a CT scanning bed on medical CT, and a ray shielding device consisting of a lead door curtain is arranged on an inlet and an outlet of a conveying channel of the object.

The imaging units at a plurality of different visual angles arranged along the conveying direction of the object can scan the object at multiple angles and multiple visual angles, and the characters of the scanned object can be analyzed and judged in time through DR images obtained by a single ray source in the scanning process, so that the scanning efficiency is improved.

The utility model provides a static CT device of multi-view angle is fixed on the position of predetermineeing of CT equipment, and the region that surrounds the formation by the static CT device of multi-view angle is the transfer passage of object business turn over promptly.

Specifically, each imaging unit comprises a plurality of X-ray source focuses distributed dispersedly, the X-ray sources are preferably cold cathode X-ray tubes based on carbon nano tubes or hot cathode X-ray tubes based on grid control technology, the X-ray source focuses in the imaging units are distributed on one or more planes along the conveying channel, and can be arranged in a straight line or an arc line, and the adjacent focuses can be distributed at equal intervals or in a non-equal interval mode.

Each ray source can be set with tube voltage, high-low voltage switching, adjacent focus high-low voltage switching, etc., the detector assembly in each imaging unit comprises a single-row detector opposite to the ray source, or a multi-row detector, and the adopted detector can be any one or combination of multiple single-energy detectors, dual-energy detectors and photon counting detectors.

When a single ray source is started, the acquired projection data are DR images under a single visual angle, and the DR images of the object under multiple visual angles can be acquired through the multiple imaging units.

The utility model discloses in define the direction of motion of object in transfer passage to Z, according to right-hand coordinate system definition X and Y to. The ray sources in the multiple groups of imaging units and the detector assemblies distributed in an array form multiple imaging planes along the conveying channel, and each imaging plane can be parallel to an X-Y plane, namely forms an included angle of 90 degrees with the Z axis; or not parallel to the X-Y plane, i.e. not forming a 90 degree angle with the Z axis; in addition, a plurality of imaging planes which are not parallel to the X-Y plane can be in a non-parallel relationship with each other, namely, different inclination angles are arranged between each imaging plane and the Z axis.

Through the form of distributing ray sources and detector assemblies in a scattered manner, compared with the form of distributing ray sources and detectors in a whole ring, the arrangement number of the ray sources and the detectors can be reduced, and the equipment cost is reduced. The imaging units arranged along the conveying channel are combined, so that real-time imaging can be realized in the advancing process, and the imaging efficiency of the object is improved.

Scanning visual angle based on every imaging unit is different, the utility model provides a plurality of imaging unit set up along the direction of delivery interval of object on transfer passage, can obtain the DR image at different visual angles through the ray source among the imaging unit. Preferably, in order to obtain imaging results of different viewing angles in the scanning process and conveniently construct the overall scanning result from DR images of different viewing angles, the imaging viewing angles of each imaging unit on the conveying channel are different, and by the arrangement mode, the overlapping of imaging areas among the imaging units can be reduced to the greatest extent, and the invalid scanning of mutually overlapped areas is avoided.

The utility model provides a ray source and detector fixed mounting are in the frame of CT equipment, and the ray source and the detector in every imaging unit set up in transfer passage's periphery with the different form of laying, can form the formation of image of multiple ray angles such as first visual angle, top visual angle, side viewing angle and diagonal angle visual angle, specifically explain with the structure expansion of different visual angle imaging unit of different embodiments.

Example 1

Referring to fig. 1, the imaging unit in this embodiment includes a plurality of radiation sources 2 disposed on the periphery of a conveying passage 1, the periphery of the conveying passage 1 is specifically square, and the radiation sources 2 include a plurality of focal points, and the plurality of focal points are arranged in series along a straight line. The radiation source 2 is specifically arranged at the bottom of the conveying channel 1, and forms an imaging unit under a low visual angle.

The detector assembly comprises a detector 3. Specifically, the detector 3 includes three sets of detectors arranged at the top and two sides of the conveying passage 1, the radiation source 2 and the three sets of detectors are arranged on a plane parallel to the X-Y plane, and an imaging plane formed by the radiation source and the three sets of detectors is perpendicular to the conveying direction of the object. The three groups of detectors 3 are arranged along the broken line and are arranged opposite to the ray source 2, so that the U-shaped arrangement of the detector assembly is formed.

In the advancing process of the object in the conveying channel 1, by controlling the starting of the ray source 2, the X-ray of the ray source 2 transmits the attenuated ray to the detector 3 after passing through the object, and the object in the conveying channel 1 can be completely projected onto the detector 3 after being irradiated by the ray source 2, so that a DR image under the action of starting the ray source 2 is obtained.

Example 2

Referring to fig. 2, the imaging unit in the present embodiment includes a plurality of radiation sources 2 disposed at the periphery of the conveying channel 1, the periphery of the conveying channel 1 is specifically square, and the radiation sources 2 include a plurality of focal points, and the plurality of focal points are arranged in series along a straight line. The radiation source 2 is specifically arranged at the top of the conveying channel 1 to form an imaging unit under a top view angle.

The detector assembly comprises a detector 3. Specifically, the detector 3 includes three sets of detectors arranged at the bottom and the side of the conveying passage 1, the radiation source 2 and the three sets of detectors 3 are arranged on an imaging plane, and the formed imaging plane is not perpendicular to the conveying direction of the object, that is, an inclined included angle is formed between the imaging plane formed by the radiation source 2 and the three sets of detectors and the X-Y plane. The three groups of detectors are arranged along a broken line, wherein the detectors at the bottom and the ray sources 2 at the top are arranged in a staggered mode in the vertical direction of the conveying channel 1, the two groups of detectors at the side are obliquely extended, and the imaging units under the top view angle are obliquely arranged relative to the conveying direction of the object. The three groups of detectors are arranged opposite to the ray source 2 to form a U-shaped arrangement of the detector components, so that the periphery of the conveying channel 1 forms a closed structure.

Example 3

Referring to fig. 3, the imaging unit in the present embodiment includes a plurality of radiation sources 2 disposed at the periphery of the conveying channel 1, the periphery of the conveying channel 1 is in a dome shape, and the radiation sources 2 include a plurality of focal spots, and the plurality of focal spots are arranged in series along a straight line. The lateral part at transfer passage 1 is specifically laid to source of radiation 2, constitutes the imaging unit under the angle of looking sideways, does not limit the concrete position that source of radiation 2 is located transfer passage 1 lateral part in this embodiment, and source of radiation 2 can set up in the left side of object direction of delivery, also can set up on the right side of object direction of delivery, and the homoenergetic reaches the technical purpose that lateral part visual angle was imaged.

The detector assembly comprises a detector 3. The detector 3 comprises three groups of detectors which are respectively arranged at the top and the bottom of the conveying channel 1 and the other side opposite to the ray source 2. Taking the case that the radiation source 2 is arranged on the left side of the conveying channel 1 as an example, the three groups of detectors are respectively arranged on the top, the bottom and the right side of the conveying channel 1, the radiation source 2 and the three groups of detectors are arranged on an imaging plane, and the formed imaging plane is inclined to the conveying direction of the object, that is, an inclined included angle is formed between the imaging plane formed by the radiation source 2 and the three groups of detectors and an X-Y plane. The three groups of detectors are arranged along a broken line, wherein the detectors on the right side are arranged along a straight line, and the detectors on the top are arranged along an arc line. Further, the detector on the right side is disposed obliquely to the object conveying direction, so that the imaging unit at the side view angle is disposed obliquely to the object conveying direction. The three groups of detectors are arranged opposite to the ray source 2 and are consecutive, so that the periphery of the conveying channel 1 forms a closed structure.

Example 4

Referring to fig. 4, the imaging unit in this embodiment includes a radiation source 2 disposed at the periphery of a conveying channel 1, the periphery of the conveying channel 1 is specifically square, the radiation source 2 includes a plurality of focuses, the plurality of focuses are continuously disposed along a broken line to form an L-shaped radiation source, and the L-shaped radiation source is specifically disposed on two adjacent surfaces of the conveying channel 1, that is, two sides of the L-shape are respectively located on two adjacent surfaces of the conveying channel and are directly connected to each other. In this embodiment, the imaging unit is specifically arranged at the lower right corner of the conveying channel 1 to form an diagonal viewing angle, the specific position of the L-shaped radiation source on the conveying channel 1 is not limited in this embodiment, and the technical purpose of diagonal viewing angle imaging can be achieved at any corner of the conveying channel 1.

Detector subassembly sets up on conveying passage 1 and the opposite diagonal angle of L shape source, specifically, the corner laminating of L shape source is in conveying passage 1's corner position, the length of its every straight flange all is less than conveying passage 1's frame length, detector subassembly includes two sets of detectors relative with L shape source, and the length of laying of every group detector 3 is the same with conveying passage 1's frame length, two sets of detectors constitute L shape detector subassembly, and be provided with the clearance between L shape detector and the L shape source, through the relative setting of L shape detector and L shape source, can reduce the quantity that sets up of detector 3 and source 2, and can form the diagonal angle formation of image of relative stability.

The imaging plane formed by the L-shaped detector and the L-shaped ray source in the embodiment can be parallel to the X-Y plane, and can also be obliquely arranged relative to the conveying direction of the object, so that the technical purpose of diagonal imaging can be achieved.

Example 5

Referring to fig. 5, based on different setting forms of the imaging units in the above embodiments, the multi-view static CT apparatus in this embodiment includes the imaging units with different views, the imaging units with different views are sequentially arranged along the object conveying direction, and are turned on in a set order in combination with the radiation source 2, so that projection data corresponding to the object at multiple angles can be acquired, and a set reconstruction algorithm is adopted, so that a CT reconstruction result of the object can be obtained after the object passes through the conveying passage 1.

In this embodiment, the arrangement forms of the detectors 3, the types and the arrangement numbers of the detectors 3 of different imaging units, and the like may be set according to specific practice, may be the same U-shape, L-shape or other forms arranged at different viewing angles, or may be a combination of different forms, and need to meet the requirement of being matched with the radiation source 2 to receive the radiation passing through the object, so as to make the object form an image on the conveying passage 1.

The utility model also provides a static CT equipment of including above-mentioned static CT device of multi-view angle can know the property of object at the in-process that the object was marchd to in time make analysis and judgment, improved formation of image efficiency under the prerequisite that reduces equipment cost.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.

Claims

1. A multi-view static CT device is characterized by comprising imaging units with different views, wherein the imaging units are arranged along the conveying direction of an object;

the imaging unit comprises a ray source and a detector assembly, and the detector assembly is arranged corresponding to the ray source;

the detector assembly comprises a plurality of groups of detectors, and the arrangement modes of the detectors comprise U-shaped, L-shaped and arc-shaped;

the different visual angles comprise more than two of a low visual angle, a top visual angle, a side visual angle and a diagonal visual angle, and the imaging visual angles of the imaging units on the conveying channel are different;

in the imaging unit with a low visual angle, the ray source is positioned at the bottom of the conveying channel;

in the imaging unit of top view, the ray source is positioned at the top of the conveying channel;

in the imaging unit of side view angle, the ray source is located at the side of the conveying channel;

in the imaging unit with the diagonal view angle, the ray sources are positioned on two adjacent surfaces of the conveying channel.

2. The multi-view static CT apparatus of claim 1, wherein the radiation source comprises a plurality of radiation source foci, and adjacent radiation source foci are arranged at equal intervals or at unequal intervals; the detector assembly comprises a single-row detector or a multi-row detector opposite to the ray source, and the detector comprises one or more of a single-energy detector, a double-energy detector and a photon counting detector.

3. The multi-view static CT apparatus of claim 1 further comprising a transport channel in which objects pass.

4. The multi-view static CT apparatus of claim 3, wherein the source and the detector are located on the same imaging plane in the imaging unit of each view, and the imaging plane is perpendicular to the transporting direction of the object or inclined with respect to the transporting direction of the object.