Rotary CT Scanning Device and System

Abstract

A rotary CT scanning device and system, the rotary CT scanning device comprising: a frame; a rotary assembly rotatably connected to the frame, the rotary assembly including a slip ring, wherein a detection object passes through the slip ring in a direction parallel to the axial direction of the slip ring; a plurality of imaging assemblies connected to the slip ring, each imaging assembly including an X-ray emitting radiation source and a matching detector array, wherein the plurality of imaging assemblies are spaced apart along the axial direction of the slip ring and are staggered in the circumferential direction of the slip ring. The above solution can improve the detection efficiency of the rotary CT scanning device.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of CT scanning equipment, and in particular to a rotating CT scanning equipment and system. Background Art

[0002] The existing rotating computed tomography (CT) detection equipment on the market, such as medical CT, usually uses an X-ray source and a detector array. Usually, the X-ray source and the detector array are fixed on a rotating frame. During detection, the rotating frame rotates at a high speed, and the object to be detected passes axially at a uniform speed from the middle area of ​​the rotating frame, thereby realizing the spiral slice detection of the object to be detected. The improvement of the detection speed can only be solved by shortening the imaging time and increasing the rotation speed, but the imaging time cannot be shortened indefinitely, so the detection speed is difficult to significantly improve, that is, the detection efficiency is low. Summary of the invention

[0003] The technical problem solved by the embodiments of the present invention is that the detection efficiency of existing rotating CT scanning equipment is low.

[0004] To solve the above technical problems, an embodiment of the present invention provides a rotating CT scanning device, comprising: a frame; a rotating component rotatably connected to the frame, the rotating component comprising a slip ring, wherein an object to be detected passes through the slip ring along a direction parallel to the axial direction of the slip ring; a plurality of imaging components connected to the slip ring, each imaging component comprising a ray source emitting X-rays and a matching detector array, wherein the plurality of imaging components are distributed at intervals along the axial direction of the slip ring and staggered along the circumferential direction of the slip ring.

[0005] Optionally, the spacing between detector arrays in adjacent groups of imaging assemblies along the axial direction of the slip ring is less than or equal to the slice spacing of tomographic imaging.

[0006] Optionally, the staggered angle of the ray sources in adjacent groups of imaging components along the circumferential direction is 360° / N, where N is the total number of imaging components.

[0007] Optionally, N=3.

[0008] Optionally, the plurality of imaging components include a first imaging component, a second imaging component and a third imaging component which are sequentially spaced apart along the axial direction of the slip ring, and each imaging component includes an X-ray source and a detector array; or, the first imaging component and the second imaging component each include an X-ray source and a detector array, and the third imaging component includes a ray source and a first detector array and a second detector array which are arranged along the axial direction of the slip ring.

[0009] Optionally, each imaging component is configured with a collimator for restricting the radiation range of the X-rays emitted by the radiation source. When the third imaging component includes a radiation source and a first detector array and a second detector array arranged along the axial direction of the slip ring, the third imaging component is configured with at least two working states. In the first working state, the radiation range of the X-rays emitted by the radiation source in the third imaging component only covers the first detector array and only the first detector array works. In the second working state, the radiation range of the X-rays emitted by the radiation source of the third imaging component covers the first detector array and the second detector array, and the first detector array and the second detector array work together. Among them, the change in the radiation coverage range of the X-rays emitted by the radiation source in the third imaging component in different working states is achieved by changing the collimation of the collimator.

[0010] Optionally, each imaging component is configured with a collimator for restricting the radiation range of the X-rays emitted by the radiation source. Each imaging component includes a radiation source and a first detector array and a second detector array arranged along the axial direction of the slip ring. Each imaging component is configured with at least two working states. In the first working state, the radiation range of the X-rays emitted by the radiation source in each imaging component only covers the first detector array and only the first detector array works. In the second working state, the radiation range of the X-rays emitted by the radiation source of each imaging component covers the first detector array and the second detector array, and the first detector array and the second detector array work together; among them, in the default mode, each imaging component is in the first working state. In response to an abnormality in the analysis result of the image collected by any one of the imaging components, it enters the detailed inspection mode, determines the radiation source parameters in the detailed inspection mode according to the abnormality of the analysis result, and in the detailed inspection mode, each imaging component is in the second working state.

[0011] Optionally, the radiation source parameters of each imaging component are different, and the moving speed of the object to be detected in the direction parallel to the axial direction of the slip ring is configured as: S = n*(D - a)*2; where S is the moving speed of the object to be detected in the direction parallel to the axial direction of the slip ring, n is the rotation speed of the slip ring, D is the distance between adjacent detectors in the axial direction of the slip ring, a is a constant, and a≥0.

[0012] An embodiment of the present invention further provides a rotating CT scanning system, including: any one of the above rotating CT scanning devices; a detection table that moves relative to the frame, the detection table is used to carry the object to be detected and carry the object to be detected through the slip ring in the direction parallel to the axial direction of the slip ring; an image processing device, which is used to receive the images collected by multiple imaging components and reconstruct the images detected by the multiple imaging components to obtain a scanned image.

[0013] Optionally, if the object to be detected is an article, the moving speed of the detection table in the direction parallel to the axis of the slip ring is configured to alternately switch between a first speed and a second speed, where the first speed is greater than the second speed. Here, the second speed refers to the moving speed of the detection table in the direction parallel to the axis of the slip ring when the images of each slice corresponding to each layer spacing can be completely acquired.

[0014] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0015] The rotating CT scanning device includes multiple imaging components connected to the slip ring. Each imaging component includes an X-ray source that emits X-rays and a matching detector. Moreover, the multiple imaging components are spaced apart along the axis of the slip ring and are staggered in the circumferential direction of the slip ring, so as to ensure the independence of the multiple imaging components, avoid interference between the imaging components, and each imaging component can simultaneously scan and image different parts of the object to be detected, thereby improving the detection efficiency. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of a rotating CT scanning device in an embodiment of the present invention from one perspective;

[0017] Figure 2 is a schematic structural diagram of a rotating CT scanning device in an embodiment of the present invention from another perspective;

[0018] Figure 3 is a schematic structural diagram of a rotating CT scanning system in an embodiment of the present invention in an application scenario;

[0019] Figure 4 is a schematic structural diagram of a rotating CT scanning system in an embodiment of the present invention in another application scenario;

[0020] Figure 5 is a schematic diagram of the collimator collimating X-rays in an embodiment of the present invention;

[0021] Description of the Reference Numerals:

[0022] 100 - Rotating CT scanning device; 1 - Frame; 2 - Slip ring; 31 - X-ray source; 32 - Detector array; 33 - Collimator; 4 - Detection table; 200 - Object to be detected; 311 - First X-ray source; 312 - Second X-ray source; 313 - Third X-ray source; 321 - First detector array; 322 - Second detector array; 323 - Third detector array; 324 - Fourth detector array; 40 - Region of the object to be measured. Detailed Embodiments

[0023] As described above, current CT scanning devices typically employ an X-ray source and an array of detectors. Usually, the X-ray source and the detector array are fixed on a rotating gantry. During detection, the rotating gantry rotates at high speed, and the object to be detected passes through the middle area of the rotating gantry axially at a constant speed, thereby achieving helical slice detection of the object to be measured. The improvement of the detection speed can only be achieved by shortening the imaging time and increasing the rotation speed. However, the imaging time cannot be infinitely shortened, so it is very difficult to significantly improve the detection speed, that is, the detection efficiency is relatively low.

[0024] To solve the above problems, in the embodiments of the present invention, a rotating CT scanning device includes multiple imaging components connected to a slip ring. Each imaging component includes an X-ray source that emits X-rays and a matching detector. Moreover, the multiple imaging components are spaced apart along the axial direction of the slip ring and are staggered in the circumferential direction of the slip ring, thereby ensuring the independence of the multiple imaging components and avoiding interference between the imaging components. And each imaging component can simultaneously scan and image different parts of the object to be detected, thereby improving the detection efficiency.

[0025] To make the above objects, features, and beneficial effects of the embodiments of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail with reference to the accompanying drawings.

[0026] Refer to Figure 1 , which shows a schematic structural diagram of a rotating CT scanning device in an embodiment of the present invention from a certain perspective, Figure 2 is a schematic structural diagram of a rotating CT scanning device in an embodiment of the present invention from another perspective; Figure 3 is a schematic structural diagram of a rotating CT scanning system in an embodiment of the present invention;

[0027] Figure 4 is a schematic structural diagram of a rotating CT scanning system in another application scenario in an embodiment of the present invention. The following will describe the specific structure of the rotating CT scanning device in combination with Figures 1 to 4 . Among them, Figures 1 to 4 the direction of the arrow in

[0028] In a specific implementation, the rotating CT scanning device 100 may include a frame 1, a rotating component, and multiple imaging components.

[0029] The rotating component is rotatably connected to the frame 1. The rotating component includes a slip ring 2. Among them, the object to be detected 200 passes through the inside of the slip ring 2 along a direction parallel to the axial direction of the slip ring 2. For example, the object to be detected 200 passes through the central area of the slip ring 2.

[0030] Multiple imaging components are connected to the slip ring 2. Each imaging component includes an X-ray source 31 that emits X-rays and a matching detector array 32. Among them, the multiple imaging components are distributed at intervals along the axial direction of the slip ring 2 and are staggered in the circumferential direction of the slip ring 2. The multiple imaging components are arranged in a spiral stepped pattern.

[0031] As can be seen from the above solution, the rotating CT scanning device includes multiple imaging components connected to the slip ring 2. Each imaging component includes an X-ray source 31 that emits X-rays and a matching detector 32. Moreover, the multiple imaging components are distributed at intervals along the axial direction of the slip ring 2 and are staggered in the circumferential direction of the slip ring 2, so as to ensure the independence of the multiple imaging components, avoid interference between the imaging components, and each imaging component can scan and image different parts of the object to be detected 200 simultaneously, thereby improving the detection efficiency.

[0032] In some non-limiting embodiments, the interval between the detectors in adjacent imaging components along the axial direction of the slip ring 2 is less than or equal to the slice thickness of the tomographic imaging. The slice thickness of the tomographic imaging can be less than or equal to the section thickness of the tomographic imaging. Among them, the section thickness of the tomographic imaging refers to the thickness of the slice of the tomographic imaging. In this way, the comprehensiveness of the detection of the object to be detected 200 can be ensured, effectively avoiding omissions, and contributing to the omission-free detection of the object to be detected 200 according to the detection requirements.

[0033] In some non-limiting embodiments, the stagger angle of the X-ray sources 31 in adjacent imaging components in the circumferential direction is 360° / N, where N is the total number of groups of imaging components.

[0034] The more the number of the X-ray sources 31 and the detector arrays 32, the larger the detection range at one time and the higher the detection efficiency. In the annular CT detection device, generally the object to be detected is placed at or near the center of the rotating slip ring 2 to facilitate detection and optimize the external dimensions of the device. Therefore, due to the requirement that the ray center must pass through the center of the slip ring 2, the X-ray sources 31 and the detector arrays 32 can only be arranged on the diameter passing through the center of the slip ring 2. Based on this, in some embodiments, N is an odd number. Configuring the number of imaging components to be odd can minimize the mutual interference between adjacent imaging components and ensure the imaging quality.

[0035] In a typical application scenario, N = 3. At this time, the angle by which multiple imaging components are offset in the circumferential direction of the slip ring 2 is 120 degrees. For ease of understanding, along the movement direction of the object to be detected 200, the three imaging components are respectively denoted as the first imaging component, the second imaging component, and the third imaging component. Taking the interval between the detectors in adjacent imaging components along the axial direction of the slip ring 2 as the slice thickness for tomographic imaging as an example. The first imaging component is located at the forefront of the slip ring 2. The second imaging component is installed axially backward from the first imaging component by the slice thickness, and is offset 120 degrees relative to the first imaging component in the circumferential direction of the slip ring 2, that is, the second imaging component is misaligned with the first imaging component by 120 degrees in the circumferential direction of the slip ring 2. The third imaging component is installed axially backward from the second imaging component by the slice thickness, and is offset 120 degrees relative to the second imaging component in the circumferential direction of the slip ring 2.

[0036] When detecting with a single X-ray source, the central angle occupied by the detector array on the radius is basically about 100 degrees. To avoid interference between the X-ray sources 31, take into account the size of the object to be measured, the external dimensions of the rotary CT scanning device 100 and other factors, the number of imaging components is selected as 3 groups. In this way, it can be directly used without changing the parameters and external dimensions of the single X-ray source, and at the same time, neither the object to be detected 200 nor the external dimensions of the device will be affected.

[0037] It can be understood that the number of imaging component groups can also be increased by increasing the external dimensions of the device, reducing the size of the detector array, etc., such as selecting 5 groups or more. It can be configured specifically according to the type of the actual object to be detected 200 or the actual requirements of the application scenario.

[0038] In a specific implementation, each detector array 32 may include multiple detectors arranged in an array.

[0039] In some embodiments, the multiple imaging components include a first imaging component, a second imaging component, and a third imaging component that are sequentially spaced apart along the axial direction of the slip ring 2. Each imaging component includes an X-ray source 31 and a detector array 32. There can be multiple configuration methods for the X-ray source parameters of each imaging component, and different configuration methods can achieve different detection purposes. The following are examples for illustration.

[0040] For example, the ray source parameters of the first imaging component group, the second imaging component group, and the third imaging component group can be configured to be the same. The moving speed S of the object to be detected 200 along the direction parallel to the axis of the slip ring 2, the rotation speed n of the slip ring 2, and the interval D between the detector arrays 32 in adjacent imaging component groups along the axis of the slip ring 2 satisfy the following relationship: S = n*(D - a)*3. a is a constant and a ≥ 0. Among them, the moving speed of the object to be detected 200 along the direction parallel to the axis of the slip ring 2 is the same as the linear moving speed of the detection table 4 carrying the object to be detected 200. At this time, compared with the prior art that uses one imaging component group, the detection efficiency can be doubled, that is, the rotational CT scanning device provided by the present invention is three times the detection efficiency of the prior art that uses one imaging component group.

[0041] For another example, the ray source parameters of the first imaging component group, the second imaging component group, and the third imaging component group are all different. The moving speed S of the object to be detected 200 along the direction parallel to the axis of the slip ring 2, the rotation speed n of the slip ring 2, and the interval D between the detector arrays 32 in adjacent imaging component groups along the axis of the slip ring 2 satisfy the following relationship: S = n*(D - a). a is a constant and a ≥ 0. Among them, the moving speed of the object to be detected 200 along the direction parallel to the axis of the slip ring 2 is the same as the linear moving speed of the detection table 4 carrying the object to be detected 200. At this time, the detection focuses of the three imaging component groups are different, and three detection effects can be obtained. The three detection effects form a complementary relationship, ensuring the clarity of imaging and the accuracy of discrimination for objects with different densities.

[0042] For yet another example, any two adjacent groups of the first imaging component group, the second imaging component group, and the third imaging component group are turned on, and the remaining group is turned off. For example, the first imaging component group and the second imaging component group are turned on, and the third imaging component group is turned off; alternatively, the second imaging component group and the third imaging component group can be turned on, and the first imaging component is turned off.

[0043] When the ray source parameters of any two turned-on imaging component groups are the same, the moving speed S of the object to be detected 200 along the direction parallel to the axis of the slip ring 2, the rotation speed n of the slip ring 2, and the interval D between the detector arrays 32 in adjacent imaging component groups along the axis of the slip ring 2 satisfy the following relationship: S = n*(D - a)*2. a is a constant and a ≥ 0. Among them, the moving speed of the object to be detected 200 along the direction parallel to the axis of the slip ring 2 is the same as the linear moving speed of the detection table 4 carrying the object to be detected 200. At this time, compared with the prior art that uses one imaging component group, the detection efficiency can be increased by one time, that is, the rotational CT scanning device provided by the present invention is twice the detection efficiency of the prior art that uses one imaging component group.

[0044] When the ray source parameters of any two sets of imaging components that are turned on are different, the moving speed S of the object to be detected 200 along the direction parallel to the axial direction of the slip ring 2, the rotation speed n of the slip ring 2, and the interval D between the detector arrays 32 in adjacent imaging components along the axial direction of the slip ring 2 satisfy the following relationship: S = n*(D - a). a is a constant, and a≥0. In this way, two sets of detection results can be obtained, and the two detection effects form a complementary relationship, ensuring the clear imaging and discrimination accuracy of objects with different densities.

[0045] In some other embodiments, both the first imaging component and the second imaging component include a ray source 31 and a detector array 32, and the third imaging component includes a ray source 31 and a first detector array and a second detector array arranged along the axial direction of the slip ring 2.

[0046] Furthermore, the intervals between the detector array 32 in the first imaging component, the detector array 32 in the second imaging component, the first detector array and the second detector array in the third imaging component along the axial direction of the slip ring 2 are evenly distributed.

[0047] Under the condition of ensuring the normal operation of the rotary CT scanning device 100, in order to minimize the unnecessary radiation of X-rays to the object to be detected, in some embodiments, each imaging component is configured with a collimator 33 for restricting the radiation range of the X-rays emitted by the ray source 31. As Figure 5 Shown in the schematic diagram of the collimation of X-rays by a collimator in an embodiment of the present invention given, the X-rays radiated by the ray source 31 of each imaging component can be adjusted and restricted within a set range by the collimator 33, and a measured object area 40 is formed to avoid the scattering of X-rays (also called X-rays), so as to reduce the radiation dose to the object to be detected 200. By collimating the X-rays emitted by the ray source 31 through the collimator 33, the detector array 32 covered by the collimated X-rays can be adjusted.

[0048] X-rays are high-energy rays with wave-particle duality, being both light waves and photons. Therefore, when two or more beams of X-rays intersect, interference will occur. This interference includes the interference of light waves with the same frequency and the impact between photons, which will affect the clarity and accuracy of imaging. The impact of photons will change the movement trajectory of photons, causing the scattering of photons, thus generating noise during imaging and affecting the accuracy of the image. And it is very difficult to completely eliminate these impacts algorithmically. In the embodiment of the present invention, the multi-group imaging components are arranged with axial intervals and circumferential displacements, realizing the double-displacement arrangement of the multi-group imaging components in the axial and circumferential directions, so that the X-rays emitted by the ray source 31 are basically non-intersecting with each other after collimation, effectively avoiding the interference and scattering phenomena of the rays and improving the imaging effect.

[0049] Taking the collimator 33 of the third imaging component as an example, the collimator 33 can switch between two collimation states. In the first collimation state, after collimating the X-rays emitted by the radiation source 31, the collimator 33 only covers the first detector array, and only the first detector array works at this time. In the second collimation state, after collimating the X-rays emitted by the radiation source 31, the collimator 33 covers the first detector array and the second detector array. At this time, the first detector array and the second detector array work together. Among them, the change in the radiation coverage range of the X-rays emitted by the radiation source of the third imaging component in different working states is achieved by changing the collimation of the collimator.

[0050] In some embodiments, when the third imaging component includes a radiation source 31 and a first detector array and a second detector array arranged along the axial direction of the slip ring 2, the third imaging component is at least configured with two working states. In the first working state, the radiation range of the X-rays emitted by the radiation source 31 in the third imaging component only covers the first detector array and only the first detector array works. In the second working state, the radiation range of the X-rays emitted by the radiation source 31 in the third imaging component covers the first detector array and the second detector array, and the first detector array and the second detector array work together.

[0051] As Figure 4 shown, for the convenience of distinguishing the radiation sources and detector arrays in different imaging components, Figure 4 the radiation source in the first imaging component is denoted as the first radiation source 311, and the detector array is denoted as the third detector array 323; the radiation source in the second imaging component is denoted as the second radiation source 312, and the detector array is denoted as the fourth detector array 324; the radiation source in the third imaging component is denoted as the third radiation source 313, and the detector arrays are denoted as the first detector array 321 and the second detector array 322. The object to be detected 200 is taken as an item for illustration. During the CT detection process of the object to be detected 200, the first radiation source 311 of the first imaging component forms a spiral detection trajectory L1 around the object to be detected 200, the second radiation source 312 of the second imaging component forms a spiral detection trajectory L2 around the object to be detected 200, and the third radiation source 313 of the third imaging component forms a spiral detection trajectory L3 around the object to be detected 200.

[0052] There can be multiple configuration methods for the radiation source parameters of the first imaging component, the second imaging component, and the third imaging component. Examples are given below. The radiation source parameters include tube voltage, tube current, focal spot size, etc.

[0053] For example, the ray source parameters of the first set of imaging components and the second set of imaging components are configured to be the same and different from those of the third set of imaging components, and the first detector array and the second detector array work together. The moving speed S of the object to be detected 200 in the direction parallel to the axis of the slip ring 2, the rotational speed n of the slip ring 2, and the interval D between the detector arrays 32 in adjacent sets of imaging components along the axis of the slip ring 2 satisfy the following relationship: S = n*(D - a)*2. a is a constant and a ≥ 0. Here, the unit of the rotational speed n can be revolutions per second, the unit of the interval D can be millimeters, and the unit of the moving speed S of the object to be detected 200 in the direction parallel to the axis of the slip ring 2 is millimeters per second. It should be noted that the units of the rotational speed n, the interval D, and the moving speed S of the object to be detected 200 in the direction parallel to the axis of the slip ring 2 can also be other units. For example, the rotational speed n is revolutions per minute, the unit of the interval D is millimeters, and the unit of the moving speed S of the object to be detected 200 in the direction parallel to the axis of the slip ring 2 is millimeters per minute.

[0054] In this way, the images collected by the detector array 32 of the first set of imaging components and the second detector array are combined to obtain a complete image of the object to be detected 200. The images collected by the first detector array and the second detector array in the third set of imaging components can be combined to obtain another complete image of the object to be detected 200. Since the ray source parameters of the first set of imaging components and the second set of imaging components are the same and different from those of the third set of imaging components, when the ray source parameters are different, different-density objects can be adapted, and thus the focus of the clarity of the obtained images is different, so that the two sets of images can form a complementary relationship to ensure clear imaging and discrimination of different-density objects. And compared with the existing rotational CT scanning device that only includes one ray source 31 and one detector array 32, the detection efficiency can be doubled. That is, the rotational CT scanning device in the embodiment of the present invention has twice the detection efficiency of the existing rotational CT scanning device that only includes one ray source 31 and one detector array 32.

[0055] For another example, the ray source parameters of the first set of imaging components, the second set of imaging components, and the third set of imaging components can be configured to be the same, and the first detector array in the third set of imaging components close to the second set of imaging components works. The moving speed S of the object to be detected 200 in the direction parallel to the axis of the slip ring 2, the rotational speed n of the slip ring 2, and the interval D between the detector arrays 32 in adjacent sets of imaging components along the axis of the slip ring 2 satisfy the following relationship: S = n*(D - a)*3. a is a constant and a ≥ 0.

[0056] In this way, the images collected by the first imaging component group, the second imaging component group, and the third imaging component group are combined to obtain a complete image of the object 200 to be detected. Moreover, compared with the existing rotating CT scanning device that only includes one ray source and one detector array 32, the detection efficiency can be doubled. That is to say, the rotating CT scanning device in the embodiment of the present invention has three times the detection efficiency of the existing rotating CT scanning device that only includes one ray source and one detector array 32.

[0057] Again, for example, the ray source parameters of the first imaging component group, the second imaging component group, and the third imaging component group are configured to be different, and the first detector array close to the second imaging component in the third imaging component group operates. The moving speed S of the object 200 to be detected along the direction parallel to the axis of the slip ring 2, the rotation speed n of the slip ring 2, and the interval D between the detector arrays 32 in adjacent imaging component groups along the axis of the slip ring 2 satisfy the following relationship: S = n * (D - a). a is a constant, and a ≥ 0. At this time, the detector arrays 32 of the first imaging component group, the detector arrays 32 of the second imaging component group, and the first detector array of the third imaging component group image respectively, generating three groups of complete detection three-dimensional images, and the three-dimensional images of each group have different focuses, forming a complementary relationship to ensure clear imaging and accurate discrimination of objects with different densities.

[0058] In some other embodiments, each imaging component group is configured with a collimator 33 for restricting the radiation range of the X-rays emitted by the ray source 31. Each imaging component group includes a ray source 31 and a first detector array and a second detector array arranged along the axis of the slip ring 2. Each imaging component group is configured with at least two working states. In the first working state, the radiation range of the X-rays emitted by the ray source 31 in each imaging component group only covers the first detector array and only the first detector array operates. In the second working state, the radiation range of the X-rays emitted by the ray source 31 in each imaging component group covers the first detector array and the second detector array, and the first detector array and the second detector array operate together. Among them, in the default mode, each imaging component group is in the first working state. In response to an abnormality in the analysis result of the image collected by any imaging component group, it enters the detailed inspection mode, and determines the ray source parameters in the detailed inspection mode according to the abnormality of the analysis result. In the detailed inspection mode, each imaging component group is in the second working state. The ray source parameters in the detailed inspection mode may be different from or the same as the ray source parameters in the default mode, and can be specifically configured according to actual requirements.

[0059] Thus, in the default mode, since only the first detector array in each set of imaging components works, the radiation to the object to be detected 200 can be reduced, and on the other hand, power consumption can be saved. When the analysis result of the image collected by any set of imaging components is abnormal, the detailed inspection mode is entered, and each set of imaging components is in the second working state, so that a comprehensive inspection of the object to be detected 200 can be realized to ensure the accuracy of the detection result. This embodiment can be adapted to the scenario where the detection object is an item, and the item to be detected can be luggage, rod-shaped parts, pipe fittings, and other irregular objects with small but long dimensions, or in the routine physical examination of the human body. Since the item usually has a certain volume and shape and is not prone to sudden changes, in some scenarios where items need to be detected, the default mode can be used to roughly detect the object to be detected 200. If the detected item is abnormal during the rough inspection, it is switched to the detailed inspection. In this way, the screening and confirmation of abnormal situations can be realized, while saving power consumption and ensuring the accuracy of the screening result.

[0060] In practice, in application places such as airport security checks and logistics security checks, security inspection items (i.e., the object to be detected 200) are usually distinguished and identified based on density. There are a wide variety of security inspection items in luggage and parcels, with complex components and a wide density range. Security inspection items include food, beverages, clothing, toys, electronic products, etc. To obtain accurate and clear inspection results, different X-ray source energies are required. High-density objects to be detected 200 require a high X-ray source voltage to increase the X-ray energy and penetration ability to obtain clearer images and improve the accuracy of detection.

[0061] In some non-limiting embodiments, the detector widths of the first detector array and the second detector array in each set of imaging components can be the same, that is, the detection widths of the first detector array and the second detector array are the same. Here, the detector width refers to the size of the detector array 32 along the axial direction of the slip ring 2.

[0062] In some embodiments, when each set of imaging components includes a radiation source 31 and a first detector array and a second detector array arranged along the axial direction of the slip ring 2, the radiation source parameters of each set of imaging components are different, and the moving speed of the object to be detected 200 along the direction parallel to the axial direction of the slip ring 2 is configured as: S = n*(D - a)*2, where a is a constant and a≥0. In this way, each set of imaging components is relatively independent and independently collects images of the object to be detected 200. And because the radiation source parameters are different from each other, the focuses of the collected images are different and complement each other to improve the discrimination accuracy of the clarity of objects with different densities.

[0063] In some other embodiments, when each imaging component group includes a radiation source and a first detector array and a second detector array arranged along the axial direction of the slip ring 2, the radiation source parameters of each imaging component group can be configured to be the same, and the moving speed of the object to be detected 200 along the direction parallel to the axial direction of the slip ring 2 is configured as: S = n*(D - a)*2N, where a is a constant and a≥0, and N is the total number of imaging component groups.

[0064] Combined with Figures 1 to 5 , an embodiment of the present invention further provides a rotational CT scanning system, including a rotational CT scanning device, a detection table 4, and an image processing device. The rotational CT scanning device can adopt the rotational CT scanning device provided in any of the above embodiments of the present invention. For the specific structure of the rotational CT scanning device, reference can be made to the description in the above embodiments, and details will not be elaborated here.

[0065] The detection table 4 moves relative to the frame 1. The detection table 4 is used to carry the object to be detected 200 and carry the object to be detected 200 through the slip ring 2 along the direction parallel to the axial direction of the slip ring 2. The image processing device is used to receive the images collected by multiple imaging component groups and reconstruct the images detected by the multiple imaging component groups to obtain a scanned image.

[0066] In specific implementation, a servo motor or the like can be used to drive the movement of the detection table 4. The movement speed of the detection table 4 can be configured according to actual detection requirements. Since the object to be detected 200 is located on the detection table 4, the moving speed of the object to be detected 200 is the same as the moving speed of the detection table 4. For the configuration of the movement speed of the detection table 4, reference can be made to the description of the moving speed of the object to be detected 200 along the direction parallel to the axial direction of the slip ring 2 in the above embodiments, and details will not be elaborated here.

[0067] In specific implementation, during the operation of the rotational CT scanning system, each imaging component moves with the slip ring 2, and the object to be detected 200 moves along the axial direction of the slip ring 2 together with the detection table 4. Therefore, the movement trajectory of each imaging component relative to the object to be detected 200 is a helix. Each imaging component group completes scanning and imaging according to its respective helix trajectory. The image processing device combines the scanned images of each imaging component group on its respective helix trajectory to obtain a complete image of the object to be detected 200.

[0068] The rotational CT scanning system provided by the embodiment of the present invention can be used in medical scenarios, such as detecting the human body, pets, etc., and can also be used in security inspection scenarios to detect luggage and articles, and can also be used in industrial inspections to detect industrial products, express deliveries, and other articles on the production line. It can be understood that it can also be used in some other scenarios, and no further examples will be given here.

[0069] If the object to be detected 200 is an item, the moving speed of the detection stage 4 in the direction parallel to the axial direction of the slip ring 2 is configured to alternately switch between a first speed and a second speed, where the first speed is greater than the second speed. Here, the second speed refers to the moving speed of the detection stage 4 in the direction parallel to the axial direction of the slip ring 2 when the images of each slice corresponding to each layer spacing can be completely acquired. Considering that an item usually has a certain size and has the characteristic of continuity and is not prone to sudden changes, by switching the moving speed of the detection stage 4 between the first speed and the second speed, sampling detection of the item can be achieved. While taking into account the detection accuracy, the detection efficiency can also be improved.

[0070] In some embodiments, in response to the image acquired by any one of the component imaging assemblies at the first speed indicating that the object to be detected 200 is abnormal, the moving speed of the detection stage 4 is switched to the second speed. In this way, when the object to be detected 200 is abnormal, switching the moving speed of the detection stage 4 to the second speed can ensure the integrity of the images of the object to be detected 200 acquired by the detector arrays 32 in each subsequent imaging assembly, which helps to determine and review abnormal situations.

[0071] In some other embodiments, in response to the images acquired by all the imaging assemblies at the second speed indicating that the object to be detected 200 is normal and reaching a set duration, the moving speed of the detection stage 4 is switched to the first speed.

[0072] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A rotating CT scanning device, characterized in that, include: frame; A rotating assembly is rotatably connected to the frame, wherein the rotating assembly comprises a slip ring, wherein the detected object passes through the slip ring in a direction parallel to the axial direction of the slip ring; A plurality of imaging components are connected to the slip ring, each imaging component comprises a ray source emitting X-rays and a matching detector array, wherein the plurality of imaging components are spaced apart along the axial direction of the slip ring and staggered along the circumferential direction of the slip ring, and each detector array comprises a plurality of detectors arranged in an array; Each imaging component is configured with a collimator for constraining the radiation range of the X-rays emitted by the ray source. Each imaging component includes a ray source and a first detector array and a second detector array arranged along the axial direction of the slip ring. Each imaging component is configured with at least two working states. In the first working state, the radiation range of the X-rays emitted by the ray source in each imaging component only covers the first detector array and only the first detector array works. In the second working state, the radiation range of the X-rays emitted by the ray source in each imaging component covers the first detector array and the second detector array, and the first detector array and the second detector array work together. In the default mode, each imaging component is in the first working state. In response to an abnormality in the analysis result of the image collected by any imaging component, a detailed inspection mode is entered. The ray source parameters in the detailed inspection mode are determined according to the abnormality of the analysis result. In the detailed inspection mode, each imaging component is in the second working state.

2. The rotating CT scanning device according to claim 1, characterized in that, The interval between the detector arrays in adjacent groups of imaging components along the axial direction of the slip ring is less than or equal to the slice distance of tomographic imaging.

3. The rotating CT scanning device according to claim 1, characterized in that, The staggered angle of the ray sources in adjacent groups of imaging components along the circumferential direction is 360° / N, where N is the total number of imaging components.

4. The rotating CT scanning device according to claim 3, characterized in that, N=3。 5. The rotating CT scanning device according to claim 1, characterized in that, The ray source parameters of each imaging component are different, and the movement speed of the detected object in a direction parallel to the axial direction of the slip ring is configured as: S=n*(Da)*2; Wherein, S is the moving speed of the detected object in a direction parallel to the axial direction of the slip ring, n is the rotation speed of the slip ring, D is the spacing of the detector arrays in adjacent imaging assemblies along the axial direction of the slip ring, a is a constant, and a≥0.

6. A rotating CT scanning system, characterized in that, include: The rotating CT scanning device according to any one of claims 1 to 5; A detection platform moves relative to the frame, and is used to carry the object to be detected, and to carry the object to be detected through the slip ring along a direction parallel to the axial direction of the slip ring; The image processing device is used to receive images collected by multiple imaging components and reconstruct the images detected by the multiple imaging components to obtain scanned images.

7. The rotating CT scanning system according to claim 6, characterized in that, If the object to be inspected is an object, the movement speed of the inspection platform along the direction parallel to the axial direction of the slip ring is configured to switch alternately between a first speed and a second speed, wherein the first speed is greater than the second speed, wherein the second speed refers to the movement speed of the inspection platform along the direction parallel to the axial direction of the slip ring when the image of the slice corresponding to each layer spacing can be completely collected.

Images