An imaging method, system, electronic device, and application for expanding the lateral field of view.

Abstract

This invention relates to the fields of radiation imaging and CT technology, specifically disclosing an imaging method, system, electronic device, and application for expanding the lateral field of view. The method includes the following steps: S1, the center of the rotating stage is moved a distance *d* in a horizontal direction perpendicular to the optical axis, and then a first scan is performed to obtain a first projected image set; S2, after the first scan, the center of the rotating stage is moved a distance *2d* in a horizontal direction perpendicular to the optical axis, opposite to the direction of the first movement, and the rotating stage is rotated clockwise by an angle *Δθ*, and then a second scan is performed to obtain a second projected image set; S3, a virtual detector is established; S4, the pixels of the original detector are mapped to the pixels of the virtual detector to complete the stitching of the two scan data, obtaining a complete projected image set of the workpiece; S5, image reconstruction is performed under the imaging geometry of the virtual detector. This invention provides clearer imaging, requires less computation time, and is versatile.

Description

Technical Field

[0001] This invention relates to the fields of radiation imaging and CT technology, and more specifically to an imaging method and system, electronic device and application for expanding the lateral field of view. Background Technology

[0002] Computer Tomography (CT) technology acquires X-ray projection images of objects from different angles and uses specific image reconstruction algorithms to obtain the three-dimensional structure of the objects. Compared with optical imaging technology, CT technology can provide information on the internal structure of objects and has become the most important non-destructive testing technology. The application fields of CT technology are no longer limited to the initial medical diagnosis, but are gradually expanding into many fields such as industrial inspection, geological analysis, and cultural relics archaeology.

[0003] In conventional X-ray CT scanning, the detector's field of view needs to cover the entire inspected workpiece laterally. Therefore, the lateral size of the inspectable workpiece is limited by the size of the X-ray image detector; for example, front array detectors are typically less than 50 cm, and linear array detectors are typically less than 100 cm. In aerospace, shipbuilding, and rail transportation fields, the size of the inspected workpiece is often much larger than the size of the image detector. If CT reconstruction is performed directly using laterally truncated scan data, significant truncation artifacts will occur, severely interfering with subsequent data analysis. To expand the lateral field of view, various offset CT scanning methods have been proposed, mainly divided into single-sided offset and double-sided offset methods using a rotating stage.

[0004] The method based on single-sided offset of the rotary stage involves moving the center of the rotary stage a certain distance along a horizontal direction perpendicular to the optical axis before scanning. The scanning field of view only covers slightly more than half of the workpiece's lateral field of view. The theoretical basis of single-sided offset is that circular track CT scanning has data redundancy. The projection data of the other side of the workpiece can be calculated from the projection data of one side, thus obtaining the complete projection data of the workpiece. However, the data redundancy condition only strictly holds in the central plane of the circular track scanning method. It approximately holds in small cone angles (generally ≤±3°) outside the central plane. The CT reconstruction image quality deviating from the central plane will significantly decrease with the increase of the longitudinal cone angle, resulting in geometric distortion and artifacts. To improve image quality, the single-sided offset scanning method based on the rotary stage needs to reduce the longitudinal cone angle, thus necessitating an increase in the number of scans and scanning time.

[0005] The method based on double-sided offset rotation involves moving the center of the rotation along a horizontal direction perpendicular to the optical axis for the first scan, and then moving it in the opposite direction by the same distance for the second scan. A data rearrangement algorithm is used to rearrange the cone-beam projection data into parallel-beam projection data, allowing the images from the two scans to be stitched together into a complete projected image of the workpiece. This is a precise image stitching method, resulting in higher CT reconstruction quality than the single-sided offset rotation method. However, because data rearrangement requires three-dimensional interpolation of the projection angles and image rows and columns, the computational load is very high. Furthermore, since the number of sampling angles is generally much smaller than the number of image rows and columns, limited angle interpolation can lead to a decrease in image resolution.

[0006] Furthermore, the above two offset scanning methods can only be used for circular track CT scans and cannot be directly applied to spiral track CT scans. When applied to different CT scan tracks, different rearrangement interpolation algorithms are required, which makes them not universal. Summary of the Invention

[0007] The purpose of this invention is to provide an imaging method, system, electronic device, and application for expanding the lateral field of view. This imaging method not only solves the problems of geometric distortion and artifacts in CT images caused by data redundancy approximation when using a single-sided offset rotating stage for image augmentation, as well as the problems of large computational load and long computation time when using a double-sided offset rotating stage for image augmentation, but also has universality.

[0008] This invention is achieved through the following technical solution: An imaging method for expanding the lateral field of view includes the following steps: S1. Mount the workpiece on the rotary table and use a displacement table to move the center of the rotary table a distance in the positive horizontal direction perpendicular to the optical axis. d Then, the first scan is performed to obtain the first set of projected images; S2. After completing the first scan, the rotary stage returns to the initial angle of the first scan, and then the displacement stage moves the center of the rotary stage a distance of 2 in the horizontal direction perpendicular to the optical axis. d The direction is opposite to the first movement direction; rotate the turntable clockwise by an angle. Then a second scan is performed to obtain a second set of projected images; the purpose of this is to ensure that the viewing angles of the two scans remain consistent in the workpiece coordinate system. S3. Establish a virtual detector, which is perpendicular to the line connecting the X-ray source and the rotation axis, and the center of the virtual detector lies on the line connecting the X-ray source and the rotation axis. The distance from the X-ray source to the virtual detector is equal to the original source-image distance. s 2. Same; S4. Map the pixel P(x,z) of the original detector to the pixel P'(x',z') of the virtual detector to complete the stitching of the two scan data and obtain the complete projected image set of the workpiece. S5. Under the imaging geometry of the virtual detector, use the stitched complete workpiece projection image set at the new source-object distance. Imaging reconstruction is performed to obtain imaging data of the complete workpiece.

[0009] The second scan of this invention differs from the existing rotary stage with double-sided offset. In this invention, the center of the rotary stage is moved a distance of 2 in a horizontal direction perpendicular to the optical axis. d Rotate the turntable clockwise by an angle Then, a second scan is performed, using a rotary stage to precisely match the two offset viewing angles. Combined with a virtual detector mapping method, lateral field of view stitching is achieved. No angle interpolation or rearrangement of data into parallel beam projection is required. Only two-dimensional interpolation of rows and columns is needed during image stitching, thus greatly reducing image stitching time. Moreover, it does not depend on data redundancy conditions, so no new artifacts are introduced during CT reconstruction. It can be used for both ordinary digital radiography (DR) and CT scan imaging. This method is independent of the specific CT scanning method, so it can be directly applied to various CT scanning scenarios such as circular tracks, spiral tracks, and straight tracks. The algorithm has strong versatility.

[0010] Further, in step S1, based on the detector width w d Lateral radius of the workpiece to be tested r Source distance s 1 and source-image distance s 2. The offset distance is constructed with the goal of fully utilizing the detector width and avoiding the influence of equipment installation errors. d The computational model.

[0011] Further, in step S1, the offset distance d The calculation model is shown below: .

[0012] Furthermore, in step S2, The calculation model is as follows: ; in, The distance the center of the rotary table moves in the horizontal direction perpendicular to the optical axis. d Then, the angle between the optical axis and the line connecting the ray source and the rotation axis.

[0013] In step S4, the mapping relationship between P(x,z) and P'(x',z') satisfies: ; ; ; in, s 2 represents the source-image distance; The distance the center of the rotary table moves in the horizontal direction perpendicular to the optical axis. d Then, the angle between the optical axis and the line connecting the X-ray source and the rotation axis, β is the component of the angle between the line connecting the pixel and the light source and the optical axis in the virtual detector coordinate system on the x' axis; In step S5, The calculation model is as follows: ; in, s 1 represents the source-object distance. d This is the offset distance.

[0014] Furthermore, the radiation source includes X-rays, neutrons, or protons.

[0015] Furthermore, imaging methods include radiation imaging or CT scans.

[0016] An imaging system for expanding the lateral field of view, comprising: A data storage module is used to store basic data, including the detector width. w d Lateral radius of the workpiece to be tested r Source distance s 1 and source-image distance s 2; The rotation angle calculation module is used to calculate the rotation angle based on a set offset distance. d and source distance s 1. Calculate the rotation angle required for the second scan. ; The execution unit includes a displacement stage, a rotary stage, and a detector. The displacement stage is used to execute horizontal movement commands issued by the control unit, the rotary stage is used to execute rotation commands issued by the control unit, and the detector is used to complete the first and second scans. The control unit is used to control the horizontal movement and rotation of the displacement stage and rotary stage, as well as the scanning action of the detector. The data acquisition module is used to acquire a set of projected images, which includes a first set of projected images and a second set of projected images. The model building module is used to build virtual detectors on the actual scanning system architecture; The image stitching module is used to map the pixels P(x,z) of the original detector to the pixels P'(x',z') of the virtual detector, and to stitch together the first and second projected image sets to obtain a projected image of the complete workpiece. The imaging reconstruction module is used to reconstruct the image of the complete workpiece by applying the geometric parameters corresponding to the virtual detector.

[0017] Furthermore, it also includes: Offset distance calculation module, used for detector width w d Lateral radius of the workpiece to be tested r Source distance s 1 and source-image distance s 2. To fully utilize the detector width and avoid the influence of equipment installation errors, the offset distance is calculated. d The range of values ​​for .

[0018] The above-described imaging system is used in the preparation of imaging products. These imaging products include DR imaging products or CT scan imaging products.

[0019] An electronic device, comprising: Memory; Processor; and Computer programs; The computer program is stored in the memory and configured to be executed by the processor to implement the imaging method described above.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The invention utilizes a rotary stage to precisely match the viewing angle difference between two offset imaging operations, thus eliminating the need for angle interpolation or rearranging the data into a parallel beam projection. During image stitching, only two-dimensional interpolation of rows and columns is required, thereby greatly reducing image stitching time.

[0021] 2. In theory, this invention can increase the lateral field of view by N times through N offsets. Since this method is a precise stitching method and does not rely on data redundancy conditions, it will not introduce new artifacts during CT reconstruction.

[0022] 3. The applications of this invention include, but are not limited to, DR imaging and CT scanning imaging. It can be used for ordinary radiation imaging as well as directly applied to various CT scanning scenarios such as circular tracks, spiral tracks, and linear tracks, demonstrating the algorithm's strong versatility. Furthermore, it can be used for any projection imaging method, including but not limited to X-ray, neutron, and proton projection imaging, indicating the invention's versatility. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the offset scanning method of the imaging method of the present invention, wherein (a) is the first offset scan; and (b) is the second offset scan. Figure 2 This refers to the difference in viewing angle between two offset scans in the workpiece coordinate system of this invention. Figure 3 This is the mapping relationship between the detector and the virtual detector during the first biasing of the present invention, where (a) is the geometric mapping relationship of the XY plane; and (b) is the geometric mapping relationship of the YZ plane. Figure 4 This is the projected image of the first offset in Example 1; Figure 5 This is the projected image of the second offset in Example 1; Figure 6 This is the image stitched together from the two offset projection images in Example 1; Figure 7 The following is a comparison of CT images reconstructed by Embodiment 1 of the present invention and existing unilateral bias methods, wherein (a) is a CT image reconstructed based on the imaging method described in Embodiment 1 of the present invention; and (b) is a CT image reconstructed based on the unilateral bias method. Figure 8 This is a schematic diagram of the imaging system described in Example 2. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0025] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known structures, materials, or methods have not been specifically described in order to avoid obscuring the invention. Example 1:

[0026] The existing technology has the following problems: (1) When the image is augmented by using data redundancy approximation for single-sided offset of the rotary stage, it will cause geometric distortion and artifacts in the CT image; (2) The double-sided offset of the rotary stage requires rearrangement of the projection data and angle interpolation, which is computationally intensive and takes a long time; (3) The rearrangement interpolation algorithms for double-sided offset of the rotary stage are different for different CT scanning tracks and are not universal.

[0027] To address the above problems, this embodiment provides an imaging method for expanding the lateral field of view, comprising the following steps: S1. Mount the workpiece on the rotary table, and move the center of the rotary table a distance along the horizontal direction (positive x-axis) perpendicular to the optical axis. d Then, the first scan is performed to obtain the first set of projected images.

[0028] Among them, the horizontal movement distance d Execute according to the input command, preferably, move the horizontal distance. d It needs to be set within a certain range: According to the detector width w d Lateral radius of the workpiece to be tested r Source distance s 1. Source-image distance s 2. Calculate the center offset distance of the rotary table using formula (1). d The range of values, in order to make full use of the detector width and avoid the influence of equipment installation errors, is generally... d The value is slightly less than ; ……………………(1); S2. After completing the first scan, the rotary stage returns to the initial angle of the first scan, and then the displacement stage moves the center of the rotary stage a distance of 2 in the horizontal direction perpendicular to the optical axis. d The direction is opposite to the first movement direction (negative x-axis), rotate the rotary table clockwise by an angle. Then a second scan is performed to obtain a second set of projected images. Rotation angle The purpose is to ensure that the viewing angles of the two scans remain consistent in the workpiece's coordinate system, thereby guaranteeing accurate stitching of the two projected image sets and minimizing the viewing angle difference. Satisfies formula (2); ……………………………(2); in, The distance the center of the rotary table moves in the horizontal direction perpendicular to the optical axis. d Then, the angle between the optical axis and the line connecting the ray source and the rotation axis.

[0029] The first offset scan and the second offset scan are as follows Figure 1 As shown; the difference in viewing angle between the two offset scans in the workpiece coordinate system is as follows: Figure 2 As shown.

[0030] S3, such as Figure 3As shown, a virtual detector is established, which is perpendicular to the line connecting the X-ray source and the rotation axis, and the center of the virtual detector lies on the line connecting the X-ray source and the rotation axis; the distance from the virtual detector to the X-ray source is... S 2.

[0031] S4. Map the pixel P(x,z) of the original detector to the pixel P'(x',z') of the virtual detector to complete the stitching of the two scan data and obtain the complete projected image set of the workpiece. Figure 3 The figure shows the geometric relationship during the first offset, based on Figure 3 The pixel mapping at the first offset shown satisfies formulas (3) to (5); …………………………………(3); …………………………………(4); ……………………………………(5); in, s 2 represents the source-image distance; The distance the center of the rotary table moves in the horizontal direction perpendicular to the optical axis. d Then, the angle between the optical axis and the line connecting the X-ray source and the rotation axis, β is the x' component of the angle between the pixel-light source line and the optical axis in the virtual detector coordinate system.

[0032] Similarly, the pixel mapping geometric relationship can be analyzed based on the geometric relationship and it can be found that the pixel mapping geometric relationship during the second offset also satisfies formula (3)~formula (5). The difference is that the detector data of the first offset is mapped to the negative half-axis of the virtual detector, and the detector data of the second offset is mapped to the positive half-axis of the virtual detector. The projection image of the complete workpiece is obtained after the two offset data are spliced ​​together.

[0033] S5. Under the imaging geometry of the virtual detector, the source-object distance of the virtual detector. s '1 satisfies formula (6), and uses the spliced ​​complete workpiece projection image set at the new source object distance. The data of the complete workpiece is then reconstructed.

[0034] ………………………………(6).

[0035] in, s 1 represents the source-object distance. d This is the offset distance.

[0036] The radiation sources include X-rays, neutrons, or protons. Imaging methods include radiation imaging or CT scans.

[0037] This invention utilizes a rotary stage to precisely match the viewing angle difference between two offset imaging operations, thus eliminating the need for angle interpolation or rearranging the data into a parallel beam projection. During image stitching, only two-dimensional interpolation of rows and columns is required, thereby greatly reducing image stitching time.

[0038] The following example of offset spiral CT scanning based on viewpoint matching illustrates the technical solution of this embodiment: The simulated workpiece is a commonly used model in the CT field, consisting of a large ellipsoid and equally spaced stacked thin ellipsoids. Its maximum lateral dimension is 69mm and its maximum longitudinal dimension is 92mm. The detector width is 400 pixels, the height is 500 pixels, and the pixel size is 200μm. The light source is an ideal X-ray point source, with a source-object distance of... s 1=750mm, source-image distance s At a magnification ratio of 1125mm, the detector's field of view cannot cover the workpiece's lateral and longitudinal fields of view. According to this invention, the lateral field of view is expanded by two offsets of the rotary stage, while the longitudinal field of view is increased by using a helical orbital scan. This solves the problem of insufficient field of view. This case requires the following steps: 1) Set the offset distance of the center of the rotary table in the horizontal direction perpendicular to the optical axis. d =25mm, initial stage angle of 0°, step angle of 1°, pitch of 50mm, total number of projections 1080, then the first CT scan simulation is performed to obtain the first projection image set, such as Figure 4 As shown.

[0039] 2) After completing the first CT scan, the rotary stage returns to its initial angle from the first CT scan, and then the center of the rotary stage is moved a distance of 2 meters in a horizontal direction perpendicular to the optical axis. d =50mm, the direction is opposite to the first movement direction, rotate the rotary table clockwise by an angle. =3.818°, other parameters are the same as the first scan, then a second CT scan simulation is performed to obtain the second projection image set; such as Figure 5 As shown.

[0040] 3) Establish a virtual detector, map the detector data from the first offset to the negative half-axis of the virtual detector, and map the detector data from the second offset to the positive half-axis of the virtual detector. The two offset data sets are then stitched together to obtain a complete projected image set of the workpiece; for example... Figure 6 As shown.

[0041] 4) Source-object distance of the virtual detector s '1=750.417, source-image distance s 2=1125mm, using the stitched projection image set, spiral FDK reconstruction is performed under the new geometric parameters to obtain the CT data of the complete workpiece; such as Figure 7As shown, by Figure 7 It can be known that: Compared to traditional unilateral bias-based methods, the CT images reconstructed by this invention exhibit no geometric distortion in the stacked thin ellipsoids, and the grayscale distribution within the stacked thin ellipsoids is more uniform. Example 2:

[0042] like Figure 8 As shown, an imaging system for implementing the imaging method described in Embodiment 1 includes: A data storage module is used to store basic data, including the detector width. w d Lateral radius of the workpiece to be tested r Source distance s 1 and source-image distance s 2; The rotation angle calculation module is used to calculate the rotation angle based on a set offset distance. d and source distance s 1. Calculate the rotation angle required for the second scan. ; The execution unit includes a displacement stage, a rotary stage, and a detector. The displacement stage is used to execute horizontal movement commands issued by the control unit, the rotary stage is used to execute rotation commands issued by the control unit, and the detector is used to complete the first and second scans. The control unit is used to control the horizontal movement and rotation of the displacement stage and rotary stage, as well as the scanning action of the detector. The data acquisition module is used to acquire a set of projected images, which includes a first set of projected images and a second set of projected images. The model building module is used to build virtual detectors on the actual scanning system architecture; The image stitching module is used to map the pixels P(x,z) of the original detector to the pixels P'(x',z') of the virtual detector, and to stitch together the first and second projected image sets to obtain a projected image of the complete workpiece. The imaging reconstruction module is used to reconstruct the image of the complete workpiece by applying the geometric parameters corresponding to the virtual detector.

[0043] Preferably, it further includes: Offset distance calculation module, used for detector width w d Lateral radius of the workpiece to be tested r Source distance s 1 and source-image distance s 2. To fully utilize the detector width and avoid the influence of equipment installation errors, the offset distance is calculated. d The range of values ​​for .

[0044] When performing the imaging operation, a set offset distance is input. d The control unit determines the set offset distance. d Is it in the calculated offset distance? d If the value is outside the range, the offset distance needs to be reset. d If so, the rotation angle calculation module obtains the set offset distance. d and source distance s 1. Calculate the rotation angle required for the second scan. After the calculation is completed, the calculation result is fed back to the control unit, which can be a PLC or an industrial computer, etc.

[0045] Then the control unit controls the rotation stage to move its center a distance along a horizontal direction (positive x-axis) perpendicular to the optical axis. d Then, the first scan is performed to obtain the first projection image set, and the data acquisition module collects and stores the first projection image set.

[0046] Then the control unit controls the rotation stage to move, and the center of the rotation stage moves a distance of 2 in the horizontal direction perpendicular to the optical axis. d The direction is opposite to the first movement direction; rotate the turntable clockwise by an angle. Then a second scan is performed to obtain a second set of projected images; the data acquisition module acquires and stores the second set of projected images.

[0047] After completing the first and second scans, image stitching is performed. During image stitching, the pixels P(x,z) of the original detector are mapped to the pixels P'(x',z') of the virtual detector. The two bias data are then stitched together to obtain a projection image of the complete workpiece. Image reconstruction is then performed under the imaging geometry of the virtual detector.

[0048] The imaging system in this embodiment is used in applications including, but not limited to, DR imaging, CT scanning imaging in various modes such as circular track, spiral track, and linear track. Example 3:

[0049] An electronic device, comprising: Memory; Processor; and Computer programs; The computer program is stored in the memory and configured to be executed by the processor to implement the imaging method as described in Embodiment 1.

[0050] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An imaging method for extending the lateral field of view, characterized in that, Includes the following steps: S1, install the workpiece on the rotating table, according to the width of the detector w d , the lateral radius of the workpiece to be detected r , the source-object distance s 1 and the source-image distance s 2, a calculation model of the offset distance d is constructed to fully utilize the width of the detector and avoid the influence of equipment installation errors, the center of the rotating table is moved vertically along the horizontal positive direction by a distance d using the displacement table, and then a first scan is performed to obtain a first projection image set, wherein the calculation model of the offset distance d is as follows: ； S2, after the first scan is completed, the rotating table returns to the initial position of the first scan, and then the displacement table is used to move the center of the rotating table along the horizontal direction perpendicular to the optical axis by a distance 2 d , the direction is opposite to the first moving direction, the rotating table is rotated by an angle clockwise, and then a second scan is performed to obtain a second projection image set; wherein, the purpose is to keep the viewing angle direction consistent in the workpiece coordinate system in the two scans, The calculation model is as follows: ； wherein, is the distance of the center of the rotating table along the horizontal direction perpendicular to the optical axis d is the angle between the optical axis and the line connecting the ray source and the rotation axis after S3, a virtual detector is established, the virtual detector is perpendicular to the line connecting the ray source and the rotation axis, and the center of the virtual detector is on the line connecting the ray source and the rotation axis, the distance from the ray source to the virtual detector is the original source-image distance s 2 same; S4. Map the pixels P(x,z) of the original detector to the pixels P'(x',z') of the virtual detector to complete the stitching of the two scan data, and obtain the complete projected image set of the workpiece. The mapping relationship between P(x,z) and P'(x',z') satisfies: ； ； ； wherein, s 2 is the source-image distance; is the distance of the center of the rotating table moving along the horizontal direction perpendicular to the optical axis d is the angle between the optical axis and the line connecting the source and the rotation axis, and β is the component of the angle between the line connecting the pixel and the light source and the optical axis in the x' axis in the virtual detector coordinate system. S5. Under the imaging geometry of the virtual detector, use the stitched complete workpiece projection image set at the new source-object distance. Imaging reconstruction is performed to obtain imaging data of the complete workpiece, among which, The calculation model is as follows: ； in, s 1 represents the source-object distance. d This is the offset distance.

2. The imaging method for expanding the lateral field of view according to claim 1, characterized in that, The radiation sources include X-rays, neutrons, or protons; the imaging methods include radiation imaging or CT scans.

3. An imaging system for expanding the lateral field of view, characterized in that, include: A data storage module is used to store basic data, including the detector width. w d Lateral radius of the workpiece to be tested r Source distance s 1 and source-image distance s 2; Offset distance calculation module, used for detector width w d Lateral radius of the workpiece to be tested r Source distance s 1 and source-image distance s 2. To fully utilize the detector width and avoid the influence of equipment installation errors, the offset distance is calculated. d The range of values ​​for ; The rotation angle calculation module is used to calculate the rotation angle based on a set offset distance. d and source distance s 1. Calculate the rotation angle required for the second scan. ; The execution unit includes a displacement stage, a rotary stage, and a detector. The displacement stage is used to execute horizontal movement commands issued by the control unit, the rotary stage is used to execute rotation commands issued by the control unit, and the detector is used to complete the first and second scans. The control unit is used to control the horizontal movement and rotation of the displacement stage and rotary stage, as well as the scanning action of the detector. The data acquisition module is used to acquire a set of projected images, which includes a first set of projected images and a second set of projected images. The model building module is used to build virtual detectors on actual scanning systems; The image stitching module is used to map the pixels P(x,z) of the original detector to the pixels P'(x',z') of the virtual detector, and to stitch together the first and second projected image sets to obtain a projected image of the complete workpiece. The imaging reconstruction module is used to reconstruct the image of the complete workpiece by applying the geometric parameters corresponding to the virtual detector.

4. The application of the imaging system as described in claim 3 in the preparation of imaging products, characterized in that, The imaging products include DR imaging products or CT scan imaging products.

5. An electronic device, characterized in that, include: Memory; processor; as well as Computer programs; The computer program is stored in the memory and configured to be executed by the processor to implement the imaging method as described in any one of claims 1-2.

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