A CL fast imaging scanning method, system, device and storage medium

Abstract

The application discloses a CL fast imaging scanning method, system and device and a storage medium, and comprises the following steps: S1, arranging N groups of ray sources and detector pairs, and making the line connecting each ray source focal point and the corresponding detector center pass through the center of the to-be-reconstructed field of view; S2, synchronously controlling N ray sources and N detectors to move along the respective circumferential trajectories by 1 / N circumferences relative to the to-be-detected target; synchronously collecting projection images by the N detectors during the movement, and synchronously recording the ray source focal point coordinates and the detector center coordinates corresponding to the projection image collection time; S3, splicing the projection image data collected by the N detectors respectively into complete circumferential data in the order of circumferential angles; and S4, performing three-dimensional reconstruction by adopting a three-dimensional reconstruction algorithm. According to the application, the N groups of ray sources and detectors work cooperatively, and the projection data of a complete circumference can be obtained by moving relatively by 1 / N circumferences, so that the scanning and imaging efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of X-ray nondestructive testing and three-dimensional imaging, specifically to a CL rapid imaging scanning method, system, device, and storage medium. Background Technology

[0002] In aerospace, automotive electronics, and high-end communications, printed circuit boards (PCBs) serve as the core connection and support components of electronic systems, and their manufacturing quality directly affects the reliability and lifespan of the entire device. With the rapid development of electronic products towards higher integration, higher density, and multilayering, the quality inspection of back-drilled holes in large-size, high-density PCBs, the inspection of BGA (Ball Grid Array) solder joint defects, and the non-destructive testing of internal microstructures have become crucial aspects of ensuring product quality. Currently, the mainstream method for high-precision non-destructive testing of such flat objects is computed tomography (CL). This technology effectively overcomes the image overlap defects of traditional two-dimensional X-ray inspection, acquiring three-dimensional structural information of the object under test.

[0003] Existing high-resolution tomography (CL) scans typically employ a circular trajectory scanning imaging mode. This involves the X-ray source and detector performing synchronized, counter-clockwise circular movements around the central axis of the current field of view (FOV) to acquire multi-angle projection data for reconstructing the three-dimensional information of the FOV region. In this mode, the X-ray source emits X-rays at a large emission angle along the normal direction of the plate-like target, ensuring that the detector receives effective X-rays at all positions along the circular trajectory, thus achieving complete angular data acquisition.

[0004] However, the existing CL scanning schemes described above have the following significant shortcomings: On the one hand, conventional CL systems employ a single X-ray source and a single detector working together. Reconstructing a field of view (FOV) requires the detector and X-ray source to complete a full circle along a circular trajectory, or the plate-like target itself to rotate a full circle, to acquire all the angular projection data needed for 3D reconstruction. Since each angle requires a certain exposure and signal readout time during X-ray projection acquisition, the complete circular motion results in a long scanning time for a single FOV, severely limiting detection efficiency. This is especially true for large PCB boards that require area-by-area stitching imaging, where the overall detection time is difficult to meet the production line's cycle time requirements.

[0005] On the other hand, in existing schemes, the X-ray source typically emits X-rays at a large emission angle (e.g., 100°) along the normal direction of the plate-shaped target. The aim is to ensure that the detector remains within the emission angle coverage of the X-ray source at all positions during its circular motion. In this configuration, since the emission angle of a single X-ray source covers almost half the space, if multiple X-ray sources operate simultaneously near the same field of view, the X-ray beams from each source will inevitably overlap and intersect, causing the detector to receive interference signals from non-corresponding X-ray sources, thus preventing the acquisition of a clear projection image. Therefore, in this configuration, a single X-ray source is difficult to use in conjunction with multiple detectors. Even if multiple X-ray sources are used simultaneously, mutual interference will prevent normal imaging, limiting further improvements in scanning efficiency.

[0006] In summary, how to effectively improve the scanning and imaging speed of the CL system while ensuring imaging quality, shorten the detection time of a single FOV, and avoid mutual interference when multiple X-ray sources are working simultaneously has become a technical challenge that urgently needs to be solved in this field. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, one of the objectives of this invention is to provide a fast CL imaging scanning method, which uses N sets of X-ray sources and detectors to work together and can obtain projection data of the complete circle by moving 1 / N circles relative to each other, thereby greatly improving the scanning imaging efficiency.

[0008] To achieve one of the objectives of this invention, the following solution is adopted: A fast CL imaging scanning method includes the following steps: S1: Arrange N sets of X-ray source and detector pairs, N≥2, so that the focal points of the N X-ray sources are evenly distributed on the first circumference, and the centers of the N detectors are evenly distributed on the second circumference. And ensure that the line connecting the focal point of each X-ray source to the center of the corresponding detector passes through the center of the field of view to be reconstructed, so as to obtain the initial spatial position data of each pair of X-ray sources and detectors; S2: Based on the initial spatial position data, synchronously control N radiation sources and N detectors to move 1 / N circles relative to the target along their respective circular trajectories; During the motion, N detectors simultaneously acquire projected images and simultaneously record the coordinates of the X-ray source focal point and the detector center at the acquisition time of each projected image, thus obtaining partial angular projected image data and corresponding partial angular position data within a 1 / N circumferential angle range. S3: Using the partial angle projection image data and the corresponding partial angle position data, the projection image data collected by each of the N detectors are stitched together in circumferential angle order to form complete circumferential data; The nth detector corresponds to the angular range of the (n-1) / Nth to n / Nth circumference, where n = 1, 2, ..., N, thus obtaining complete projected image data covering the entire circumference from 0° to 360° and the corresponding complete position data. S4: Using the complete projected image data and the corresponding complete position data, a three-dimensional reconstruction algorithm is used to perform three-dimensional reconstruction to obtain the three-dimensional image data of the current field of view to be reconstructed.

[0009] Furthermore, in step S1, the radiation source is an X-ray with a three-dimensional emission angle of 20° to 60°, and each radiation source is placed tilted towards the center so that the angle between the center line of its three-dimensional emission angle and the vertical direction is 10° to 50°. Each radiation source has only one detector corresponding to it within its three-dimensional emission angle range.

[0010] Further, in step S1, the diameter of the first circumference is The diameter of the second circumference is The system resolution R is determined by the physical pixel size P of the detector. and Determine using the following formula: Further, in step S1, the distance SOD from the focal point of the X-ray source to the center of the field of view to be reconstructed is 10mm to 90mm, and the distance ODD from the center of the field of view to the center of the detector is 70mm to 230mm.

[0011] Furthermore, in step S2, the synchronous control of N radiation sources and N detectors moving 1 / N circumferences relative to the target along their respective circular trajectories is achieved in the following manner: The target to be measured remains stationary, while N radiation sources and N detectors are controlled to move synchronously along their respective circular trajectories at the same angular velocity for 1 / N of a circle. Alternatively, N radiation sources and N detectors remain stationary, while the target to be measured is rotated 1 / N of a circle around its plane normal.

[0012] Further, in step S2, the synchronous control of N radiation sources and N detectors involves moving relative to the target along their respective circular trajectories for 1 / N circumferences, with a motion angular velocity... satisfy: Where f is the image acquisition frequency of the detector, and M is the total number of images that need to be acquired for the complete circle; Each detector synchronously acquires projected images and records position data according to the image acquisition frequency.

[0013] Furthermore, in step S3, when the projected image data collected by each of the N detectors are stitched together in circumferential angle order, the corresponding angle ranges of each detector do not overlap, and the projected data of each detector can be directly distinguished by angle without the need for overlapping area calibration or processing.

[0014] The second objective of this invention is to provide a CL rapid imaging scanning system, which uses N sets of X-ray sources and detectors to work together and can obtain projection data of a complete circle by moving 1 / N of a circle relative to each other, thereby greatly improving the scanning imaging efficiency.

[0015] To achieve the second objective of this invention, the following solution is adopted: A CL rapid imaging scanning system, comprising: The arrangement module is used to arrange N sets of X-ray source and detector pairs, N≥2, so that the focal points of the N X-ray sources are evenly distributed on the first circumference and the centers of the N detectors are evenly distributed on the second circumference; and the line connecting the focal point of each X-ray source and the center of the corresponding detector passes through the center of the field of view to be reconstructed, so as to obtain the initial spatial position data of each set of X-ray source and detector pairs. The motion control and data acquisition module is used to synchronously control N X-ray sources and N detectors to move 1 / N of a circle relative to the target under test along their respective circular trajectories based on the initial spatial position data. During the movement, the N detectors synchronously acquire projected images and synchronously record the X-ray source focal coordinates and detector center coordinates corresponding to the acquisition time of each projected image, thereby obtaining partial angle projected image data and corresponding partial angle position data within the 1 / N circular angle range. The data stitching module is used to stitch together the projection image data collected by each of the N detectors into complete circumferential data in circumferential angle order using the partial angle projection image data and the corresponding partial angle position data; wherein, the nth detector corresponds to the angle range from (n-1) / N to n / N of the circumference, n=1,2,…,N, to obtain complete projection image data and corresponding complete position data covering the complete circumference from 0° to 360°; The 3D reconstruction module is used to perform 3D reconstruction using the complete projected image data and the corresponding complete position data, and to obtain the 3D image data of the current field of view to be reconstructed.

[0016] The third objective of this invention is to provide a CL rapid imaging scanning device, which obtains projection data of a complete circle by working in coordination with N sets of X-ray sources and detectors and moving relative to each other by 1 / N circumferences, thereby greatly improving the scanning imaging efficiency.

[0017] To achieve the third objective of this invention, the following solution is adopted: A fast CL imaging scanning apparatus includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is a fast CL imaging scanning program, and when the processor executes the fast CL imaging scanning program, it implements the steps of the fast CL imaging scanning method as described in one of the objectives of this invention.

[0018] The fourth objective of this invention is to provide a storage medium that, through the coordinated operation of N sets of X-ray sources and detectors, can obtain projection data of a complete circle by moving relative to each other by 1 / N circumferences, thereby significantly improving scanning imaging efficiency.

[0019] To achieve the fourth objective of this invention, the following solution is adopted: A storage medium, which is a computer-readable storage medium, stores a computer program thereon, the computer program being a CL fast imaging scanning program, which, when executed by a processor, implements the steps of the CL fast imaging scanning method as described in one of the objectives of this invention.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention significantly improves scanning imaging efficiency. Existing CL systems using a single X-ray source and a single detector require the X-ray source and detector to move a full circle (360°) relative to the target, or for the target to rotate once, in order to acquire all the angular projection data required for 3D reconstruction of a field of view. This invention arranges N pairs of X-ray sources and detectors, with the focal points of the N X-ray sources evenly distributed on the first circle and the centers of the N detectors evenly distributed on the second circle. The N pairs of X-ray sources and detectors are controlled to move synchronously relative to the target for only 1 / N of a circle. Simultaneously, the N detectors synchronously acquire projection images within their respective angular ranges. After stitching, all projection data covering a full circle from 0° to 360° can be obtained, reducing the scanning time to 1 / N of that of traditional methods. Under the same rotation speed conditions, the imaging efficiency is increased by N times, effectively solving the problem of excessively long overall time consumption when inspecting large-size PCBs region by region.

[0021] 2. This invention simplifies the data stitching method. In this invention, the nth detector corresponds to the continuous angle range from (n-1) / N to n / N of the circumference, where n = 1, 2, ..., N. The angle ranges of the N detectors are seamlessly connected in sequence. Complete circumferential data from 0° to 360° can be formed by directly stitching the circumferential angles in sequence. The stitching logic is clear and the calculation is simple, without the need for complex registration or fusion algorithms.

[0022] 3. This invention achieves efficient collaborative operation of multiple sets of X-ray sources and detectors. By employing a one-to-one correspondence between N X-ray sources and N detectors, all detectors simultaneously acquire projected images during synchronous motion. This fully utilizes the parallel acquisition capabilities of multiple detectors, acquiring all projected data for a complete circle within the time frame of one 1 / N-circle movement, thus significantly improving acquisition efficiency.

[0023] 4. This invention guarantees the quality of 3D reconstruction. The complete circular projection data acquired by this invention contains angular information covering 0° to 360°, which is completely equivalent to the data obtained by existing single-source single-detector systems after moving a complete circle in terms of angular coverage and information content. Therefore, it can ensure that the image quality of 3D reconstruction is not reduced due to the improvement in efficiency.

[0024] 5. This invention has a wide range of applications and strong scalability. The value of N can be flexibly selected according to the actual detection efficiency requirements and equipment costs. When it is necessary to further improve the scanning speed, simply increase the number of X-ray sources and detectors (N) to further shorten the movement distance. It has good scalability and can adapt to the efficiency and cost requirements of different detection scenarios. Attached Figure Description

[0025] Figure 1 This is a flowchart of the CL fast imaging scanning method in an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the collaborative operation of multiple radiation sources and multiple detectors in an embodiment of the present invention; Figure 3 This is a schematic diagram showing the connection between the X-ray source and the corresponding detector passing through the center of the field of view (FOV) in an embodiment of the present invention. Figure 4 This is a schematic diagram of the emission angle of the X-ray source in an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating simultaneous imaging and data acquisition by four detectors when the target rotates 90 degrees, as described in an embodiment of the present invention. Figure 6 This is a block diagram of the CL rapid imaging scanning system in an embodiment of the present invention. Detailed Implementation

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] Example 1 like Figure 1-5 As shown, this embodiment of the invention provides a fast CL imaging scanning method, including the following steps: S1: Arrange N pairs of X-ray sources and detectors, N≥2, so that the focal points of the N X-ray sources are evenly distributed on the first circumference and the centers of the N detectors are evenly distributed on the second circumference; and make the line connecting the focal point of each X-ray source and the center of the corresponding detector pass through the center of the field of view to be reconstructed, so as to obtain the initial spatial position data of each pair of X-ray sources and detectors.

[0028] S2: Based on the initial spatial position data, N X-ray sources and N detectors are synchronously controlled to move 1 / N circumference relative to the target under test along their respective circular trajectories. During the movement, the N detectors synchronously acquire projected images and synchronously record the X-ray source focal coordinates and detector center coordinates corresponding to the acquisition time of each projected image, thereby obtaining partial angle projected image data and corresponding partial angle position data within the 1 / N circumference angle range.

[0029] S3: Using the partial angle projection image data and the corresponding partial angle position data, the projection image data collected by each of the N detectors are stitched together in circumferential angle order to form complete circumferential data; wherein, the nth detector corresponds to the angle range of the (n-1) / Nth to n / Nth circumference, n=1,2,…,N, to obtain complete projection image data and corresponding complete position data covering the complete circumference from 0° to 360°.

[0030] S4: Using the complete projected image data and the corresponding complete position data, a three-dimensional reconstruction algorithm is used to perform three-dimensional reconstruction to obtain the three-dimensional image data of the current field of view to be reconstructed.

[0031] The CL rapid imaging scanning method of the present invention will be further described in detail below.

[0032] The CL rapid imaging scanning method of this invention is mainly for the detection of flat objects such as large-size printed circuit boards (PCBs). When scanning and imaging plate-shaped targets, it uses multiple X-ray sources and multiple X-ray detectors in coordination, which can simultaneously collect data from different angles in the same field of view (FOV). Compared with traditional methods that can only collect data from a single angle at a time, this invention can significantly improve scanning and imaging efficiency.

[0033] The fast imaging scanning method for CL in this invention solves the problems of slow imaging scanning speed and low efficiency in existing CL systems, such as... Figure 2As shown, the system consists of multiple sets of X-ray sources and detectors. Each detector is tilted towards the center so that its rays illuminate only the detector it is paired with, ensuring that each detector receives rays from only one X-ray source. The line connecting the centers of the detectors and the X-ray sources passes through the center of the CL system (the center of the FOV of the target). N detectors and N multiple X-ray sources are evenly distributed on their respective circular trajectories. Therefore, when acquiring data for the corresponding FOV, this system only requires these N sets of detectors and X-ray sources to move simultaneously along a circular trajectory of 1 / N circumference relative to the target (traditional CL systems require the X-ray source and detector to move the entire circumference relative to the target) to acquire the full circumference data required for FOV reconstruction, thereby improving the efficiency of scanning imaging.

[0034] In some embodiments, the system consists of multiple sets of radiation sources and detectors. Each detector is paired with a radiation source. Instead of using a large emission angle to emit radiation along the normal direction of the plate-shaped target, the radiation source adopts an emission angle of 20-60 degrees. The radiation source is placed at an angle of 10-50 degrees towards the center of the three-dimensional emission angle, so that only its corresponding detector is within the three-dimensional emission angle, thus avoiding one detector receiving radiation from multiple radiation sources and causing mutual interference.

[0035] In some embodiments, such as Figure 3 As shown, the focal points of N X-ray sources are uniformly distributed in a region with a diameter of [missing information]. On the circumference of a circle, the centers of N detectors are also evenly distributed within a circle with a diameter of On the circumference of a circle. A radiation source and a detector are placed facing each other, with the line connecting the focal point of the radiation source and the center of the detector passing through the center of the FOV to be reconstructed. and This determines the system's resolution R. The distance from the X-ray source focal point to the center of the FOV to be reconstructed (SOD) is 10-90 mm, and the distance from the center of the FOV to the center of the detector (ODD) is 70-230 mm.

[0036] Under the aforementioned tilted ray conditions, assuming the physical pixel size of the detector is P, the system resolution is: In some embodiments, when adjusting the reconstruction resolution, the diameter is and Adjustments can be made as needed, meaning the positions of the X-ray sources and detectors can be changed accordingly through motion control, while ensuring that the focal points of each X-ray source are on a circle, the centers of each detector are also on a circle, and the line connecting the focal point of the X-ray source to the center of the corresponding detector passes through the center of the FOV.

[0037] In some embodiments, calibration is completed by using a calibration plate with a marker ball and employing the least squares calibration method to minimize the reprojection residual of the marker ball's imaging position on the detector, thus unifying all detector and X-ray source positions in the same coordinate system. By unifying the X-ray source and detector positions to the same coordinate system through calibration, reconstruction can be directly performed using the detector and X-ray source positions; image data is directly differentiated by angle, requiring no further calibration or overlap processing.

[0038] In some embodiments, the steps for acquiring X-ray projection data are as follows: 1. First, place the target (e.g., a PCB board) on the stage; 2. Simultaneously turn on N X-ray sources to emit X-rays; 3. Control the N X-ray sources and N detectors to move to the corresponding positions of the FOV to be measured; 4. Control the X-ray sources and detectors to perform synchronous circular motion relative to the target, while simultaneously controlling the N detectors to synchronously collect data (the angular velocity of the synchronous circular motion of the X-ray sources and detectors is...). (degrees / second), where 5. Repeat the previous step until 1 / N of the circular motion is completed, and you will get the complete data of one FOV; 6. Repeat steps 1-5 until all FOV data on the target is collected.

[0039] In some embodiments, there are two methods for scanning imaging, specifically: The first method involves a stationary plate-shaped target, with N radiation sources and N detectors moving synchronously along their respective circular trajectories at the same angular velocity for 1 / N of a circle. During this time, the N detectors simultaneously collect data and ultimately synthesize the complete data for one circle.

[0040] The second method involves keeping N radiation sources and N detectors stationary while rotating the plate-shaped target 1 / N of a circle around its plane normal. During this rotation, the N detectors simultaneously collect data and ultimately synthesize the complete data for one full circle.

[0041] In some embodiments, data for a 0-1 / N circumference is obtained from a first set of X-ray sources and detectors, data for a 1 / N-2 / N circumference is obtained from a second set of X-ray sources and detectors, and so on, with N sets of X-ray sources and detectors obtaining data for a complete circumference from 0 to 360 degrees. The data includes projected images acquired under various angular conditions, as well as the coordinates of the X-ray source (focal point) and detector (center) at the time of image acquisition.

[0042] In some embodiments, the classic FDK reconstruction method of the CL system can be used to perform three-dimensional reconstruction on the acquired data.

[0043] The following will use four sets of X-ray sources and detectors as examples to illustrate the CL rapid imaging scanning method of this invention.

[0044] like Figure 2 As shown, a detector array consists of four detectors with identical target surfaces, located on a circle with a diameter of 108.54 mm. The target surfaces of each detector are spaced exactly 90 degrees apart. Four X-ray sources are also located on a circle with a diameter of 27.14 mm, spaced 90 degrees apart. The distance from the focal point of the X-ray source to the center of the field of view (FOV) to be reconstructed (SOD) is 54.27 mm, and the distance from the center of the FOV to the center of the detector (ODD) is 217.08 mm. If the pixel size of the detector is 50 μm, then the system resolution (3D reconstruction accuracy) is 10 μm.

[0045] like Figure 4 As shown, the X-ray source is tilted towards the center, with its solid angle centerline tilting at an angle of 30 degrees (the angle between the solid angle and the vertical direction). The centerline of the emission solid angle is approximately aligned with the center of its corresponding detector. The solid emission angle is also 30 degrees, and the detector target surface corresponding to each emission source is completely contained within its emission angle. The line connecting the X-ray source focal point and the corresponding detector center passes through the center of the FOV to be reconstructed.

[0046] like Figure 5 As shown, with the center of the field of view (FOV) as the rotation center, the plate-shaped target is rotated 90 degrees in the xy plane. At each degree of rotation, four detectors simultaneously acquire X-ray projection images, and synchronously record the position of the X-ray source and the detector at the moment of image formation. After the target rotates 90 degrees, detector 1 obtains projection image data from 0-90 degrees, detector 2 obtains projection image data from 90-180 degrees, detector 3 obtains projection image data from 180-270 degrees, and detector 4 obtains projection image data from 270-360 degrees, resulting in a total of 360 angles of projection image data.

[0047] Compared to the traditional method where a single X-ray source and single detector require a full rotation (360 degrees) relative to the target, this application example only requires a 90-degree rotation relative to the target, resulting in a nearly four-fold increase in scanning imaging speed under the same rotational speed conditions.

[0048] Using the classic FDK algorithm, the current FOV can be reconstructed in three dimensions by using projection images from 360 angles and the position data of the X-ray source and detector at the imaging time.

[0049] Example 2 like Figure 6 As shown, this embodiment of the invention also provides a CL rapid imaging scanning system, comprising: The arrangement module is used to arrange N sets of X-ray source and detector pairs, N≥2, so that the focal points of the N X-ray sources are evenly distributed on the first circumference and the centers of the N detectors are evenly distributed on the second circumference; and the line connecting the focal point of each X-ray source and the center of the corresponding detector passes through the center of the field of view to be reconstructed, so as to obtain the initial spatial position data of each set of X-ray source and detector pairs. The motion control and data acquisition module is used to synchronously control N X-ray sources and N detectors to move 1 / N of a circle relative to the target under test along their respective circular trajectories based on the initial spatial position data. During the movement, the N detectors synchronously acquire projected images and synchronously record the X-ray source focal coordinates and detector center coordinates corresponding to the acquisition time of each projected image, thereby obtaining partial angle projected image data and corresponding partial angle position data within the 1 / N circular angle range. The data stitching module is used to stitch together the projection image data collected by each of the N detectors into complete circumferential data in circumferential angle order using the partial angle projection image data and the corresponding partial angle position data; wherein, the nth detector corresponds to the angle range from (n-1) / N to n / N of the circumference, n=1,2,…,N, to obtain complete projection image data and corresponding complete position data covering the complete circumference from 0° to 360°; The 3D reconstruction module is used to perform 3D reconstruction using the complete projected image data and the corresponding complete position data, and to obtain the 3D image data of the current field of view to be reconstructed.

[0050] Example 3 This invention also provides a CL rapid imaging scanning device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is a CL rapid imaging scanning program, and when the processor executes the CL rapid imaging scanning program, it implements the steps of the CL rapid imaging scanning method as described in Embodiment 1.

[0051] Example 4 This invention also provides a storage medium, which is a computer-readable storage medium storing a computer program thereon. The computer program is a CL fast imaging scanning program, which, when executed by a processor, implements the steps of the CL fast imaging scanning method as described in Embodiment 1.

[0052] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A fast imaging scanning method for CL (Clear Frame), characterized in that, Includes the following steps: S1: Arrange N sets of X-ray source and detector pairs, N≥2, so that the focal points of the N X-ray sources are evenly distributed on the first circumference, and the centers of the N detectors are evenly distributed on the second circumference. And ensure that the line connecting the focal point of each X-ray source to the center of the corresponding detector passes through the center of the field of view to be reconstructed, so as to obtain the initial spatial position data of each pair of X-ray sources and detectors; S2: Based on the initial spatial position data, synchronously control N radiation sources and N detectors to move 1 / N circles relative to the target along their respective circular trajectories; During the motion, N detectors simultaneously acquire projected images and simultaneously record the coordinates of the X-ray source focal point and the detector center at the acquisition time of each projected image, thus obtaining partial angular projected image data and corresponding partial angular position data within a 1 / N circumferential angle range. S3: Using the partial angle projection image data and the corresponding partial angle position data, the projection image data collected by each of the N detectors are stitched together in circumferential angle order to form complete circumferential data; The nth detector corresponds to the angular range of the (n-1) / Nth to n / Nth circumference, where n = 1, 2, ..., N, thus obtaining complete projected image data covering the entire circumference from 0° to 360° and the corresponding complete position data. S4: Using the complete projected image data and the corresponding complete position data, a three-dimensional reconstruction algorithm is used to perform three-dimensional reconstruction to obtain the three-dimensional image data of the current field of view to be reconstructed.

2. The CL rapid imaging scanning method according to claim 1, characterized in that, In step S1, the X-ray source uses X-rays with a three-dimensional emission angle of 20° to 60°, and each X-ray source is placed tilted towards the center so that the angle between the center line of its three-dimensional emission angle and the vertical direction is 10° to 50°. Each X-ray source has only one detector corresponding to it within its three-dimensional emission angle range.

3. The CL rapid imaging scanning method according to claim 1, characterized in that, In step S1, the diameter of the first circumference is The diameter of the second circumference is The system resolution R is determined by the physical pixel size P of the detector. and Determine by the following formula: 。 4. The CL rapid imaging scanning method according to claim 3, characterized in that, In step S1, the distance SOD from the focal point of the X-ray source to the center of the field of view to be reconstructed is 10mm to 90mm, and the distance ODD from the center of the field of view to be reconstructed to the center of the detector is 70mm to 230mm.

5. The CL rapid imaging scanning method according to claim 1, characterized in that, In step S2, the synchronous control of N radiation sources and N detectors to move 1 / N circumferences relative to the target along their respective circular trajectories is achieved in the following manner: The target to be measured remains stationary, while N radiation sources and N detectors are controlled to move synchronously along their respective circular trajectories at the same angular velocity for 1 / N of a circle. Alternatively, N radiation sources and N detectors remain stationary, while the target to be measured is rotated 1 / N of a circle around its plane normal.

6. The CL rapid imaging scanning method according to claim 1, characterized in that, In step S2, the synchronous control of N radiation sources and N detectors involves moving relative to the target along their respective circular trajectories for 1 / N of a circle, with a motion angular velocity... satisfy: Where f is the image acquisition frequency of the detector, and M is the total number of images that need to be acquired for the complete circle; Each detector synchronously acquires projected images and records position data according to the image acquisition frequency.

7. The CL rapid imaging scanning method according to claim 1, characterized in that, In step S3, when the projected image data collected by each of the N detectors are stitched together in circumferential angle order, the corresponding angle ranges of each detector do not overlap. The projected data of each detector can be directly distinguished by angle, without the need for calibration or processing of overlapping areas.

8. A CL rapid imaging scanning system, characterized in that, include: The arrangement module is used to arrange N sets of X-ray source and detector pairs, N≥2, so that the focal points of the N X-ray sources are evenly distributed on the first circumference and the centers of the N detectors are evenly distributed on the second circumference; and the line connecting the focal point of each X-ray source and the center of the corresponding detector passes through the center of the field of view to be reconstructed, so as to obtain the initial spatial position data of each set of X-ray source and detector pairs. The motion control and data acquisition module is used to synchronously control N X-ray sources and N detectors to move 1 / N of a circle relative to the target under test along their respective circular trajectories based on the initial spatial position data. During the movement, the N detectors synchronously acquire projected images and synchronously record the X-ray source focal coordinates and detector center coordinates corresponding to the acquisition time of each projected image, thereby obtaining partial angle projected image data and corresponding partial angle position data within the 1 / N circular angle range. The data stitching module is used to stitch together the projection image data collected by each of the N detectors into complete circumferential data in circumferential angle order using the partial angle projection image data and the corresponding partial angle position data; wherein, the nth detector corresponds to the angle range from (n-1) / N to n / N of the circumference, n=1,2,…,N, to obtain complete projection image data and corresponding complete position data covering the complete circumference from 0° to 360°; The 3D reconstruction module is used to perform 3D reconstruction using the complete projected image data and the corresponding complete position data, and to obtain the 3D image data of the current field of view to be reconstructed.

9. A CL rapid imaging scanning device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is a CL rapid imaging scanning program, characterized in that: When the processor executes the CL fast imaging scanning program, it implements the steps of the CL fast imaging scanning method as described in any one of claims 1-7.

10. A storage medium, said storage medium being a computer-readable storage medium, having stored thereon a computer program, said computer program being a CL rapid imaging scanning program, characterized in that: When the CL fast imaging scanning program is executed by the processor, it implements the steps of the CL fast imaging scanning method as described in any one of claims 1-7.

Images