Angle correction assembly and correction method and device for scanning equipment

Abstract

The invention relates to the technical field of medical imaging equipment, and discloses an angle correction assembly and a correction method and device for scanning equipment. The first end of a connecting piece in the angle correction assembly is freely and rotatably connected with a first reference part, and the second end of the connecting piece is connected with a second reference part; the projection of the connecting line of the reference points on the first reference part and the second reference part on the reference surface is parallel to the gravity direction; the method comprises the following steps: acquiring a scanned image of the angle correction assembly by scanning equipment; determining a position relation of reference points of the first reference part and the second reference part in a bulb tube coordinate system based on the scanning image of the angle correction assembly; based on the position relation of the reference points of the first reference part and the second reference part, the zero-position error amount of the bulb tube of the scanning equipment is calculated, and the zero-position error amount is the offset of the actual zero position of the bulb tube relative to the ideal zero position; and correcting the scanned image of the target object based on the zero-bit error amount.

Description

Technical Field

[0001] The present disclosure relates to the technical field of medical imaging equipment, for example, to an angle correction component, a correction method and a device for a scanning device. Background Art

[0002] In modern medical imaging technology, scanning devices equipped with tubes, such as computed tomography (CT) devices, are widely used in clinical diagnosis. These devices use X-rays generated by the tube to scan specific parts of the scanned target (such as patients), thereby obtaining a tomographic structural image of the location. The quality of the image is crucial for clinical diagnosis, and the quality of the image will directly affect the doctor's judgment and treatment decision.

[0003] In addition to image quality, the direction of the image is equally important. If the image is deflected, it will seriously affect the doctor's judgment of the location of the lesion, which may lead to misdiagnosis or missed diagnosis. In this type of scanning equipment, the tube should be directly above the rotation axis at the 0 position to ensure the correct direction of the image. However, due to factors such as mechanical installation errors and equipment aging, the actual 0 position of the tube often deviates from the ideal 0 position, causing the image to deflect. This 0-position error not only affects the direction of the image, but also causes inaccurate image reconstruction, which in turn affects the diagnosis results. Therefore, correcting the 0-position error of the tube is a key step in improving image quality and directional accuracy. However, the related art lacks an effective means to improve image quality and directional accuracy by correcting the 0-position error of the tube.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0006] The embodiments of the present disclosure provide an angle correction component, a correction method and a device for a scanning device, which can effectively improve image quality and directional accuracy and significantly reduce image deflection.

[0007] According to a first aspect of the present disclosure, there is provided an angle correction assembly, comprising: a first reference portion, a second reference portion and a connecting member, the connecting member comprising a first end and a second end opposite to each other, the first end being connected to the first reference portion in a freely rotatable manner, the second end being connected to the second reference portion, and being capable of ensuring that, under the action of gravity, the projection of a line connecting reference points on the first reference portion and the second reference portion on a reference plane is parallel to the direction of gravity, the reference points on the first reference portion and the second reference portion can be identified in the scanned images of the first reference portion and the second reference portion, and the reference plane is a virtual plane perpendicular to the rotation axis of the tube.

[0008] In some embodiments, the first reference portion and the second reference portion are cylinders, the connecting member can ensure that the axes of the first reference portion and the second reference portion are parallel, and the reference points of the first reference portion and the second reference portion are respectively located on the axes of the first reference portion and the second reference portion.

[0009] In some embodiments, the connecting member includes a plurality of connecting rods arranged in parallel, the first ends of the plurality of connecting rods are sleeved on the first reference portion and are spaced apart along the axial direction of the first reference portion, and the second ends of the plurality of connecting rods are sleeved on the second reference portion and are spaced apart along the axial direction of the second reference portion.

[0010] In some embodiments, the angle correction assembly further includes a support fixedly connected to the first reference portion and used to connect to a phantom support on the scanning bed.

[0011] According to a second aspect of the present disclosure, a correction method for a scanning device is provided. The correction method uses the angle correction component provided by the first aspect of the present disclosure. The correction method includes:

[0012] Acquire a scanned image of the angle correction component using a scanning device;

[0013] Based on the scanned image of the angle correction component, determining the positional relationship between the reference points of the first reference part and the second reference part in the tube coordinate system;

[0014] Calculating the 0-position error of the tube of the scanning device based on the positional relationship between the reference points of the first reference part and the second reference part, wherein the 0-position error is the offset of the actual 0-position of the tube relative to the ideal 0-position;

[0015] The scanned image of the target object is corrected based on the 0-bit error amount.

[0016] In some embodiments, the tube coordinate system includes a first coordinate axis and a second coordinate axis, the first coordinate axis is a coordinate axis pointing from the tube to the detector, and the second coordinate axis is perpendicular to the first coordinate axis and perpendicular to the rotation axis of the tube;

[0017] Based on the scanning image of the angle correction component, the positional relationship between the reference points of the first reference part and the second reference part in the tube coordinate system is determined, including: based on the scanning image of the angle correction component, determining the first coordinate value of the reference points of the first reference part and the second reference part in the first coordinate axis and the second coordinate value in the second coordinate axis.

[0018] In some embodiments, the first reference portion and the second reference portion are cylindrical, and based on the scanned image of the angle correction component, determining the first coordinate value of the reference point of the first reference portion and the second coordinate value of the reference point of the first reference portion and the second reference portion in the first coordinate axis and the second coordinate value in the second coordinate axis includes:

[0019] Based on the scanned image of the angle correction component, acquiring geometric contours of the first reference portion and the second reference portion on the scanned image;

[0020] The center coordinate values ​​of the geometric outlines of the first reference part and the second reference part on the scanned image are determined as the first coordinate values ​​of the reference points of the first reference part and the second reference part in the first coordinate axis and the second coordinate values ​​in the second coordinate axis.

[0021] In some embodiments, calculating the zero-position error of the tube of the scanning device based on the positional relationship between the reference points of the first reference part and the second reference part includes:

[0022] Calculate a first difference between first coordinate values ​​of reference points of the first reference portion and the second reference portion;

[0023] Calculate a second difference between second coordinate values ​​of reference points of the first reference portion and the second reference portion;

[0024] Based on the first difference and the second difference, the 0-position error of the tube of the scanning device is calculated using a trigonometric function relationship, wherein the 0-position error angle is the angle between the actual 0-position of the tube and the ideal 0-position relative to the rotation center.

[0025] In some embodiments, the 0-position error amount is a 0-position error angle, and the 0-position error angle is the angle between the actual 0-position of the tube and the ideal 0-position relative to the rotation center;

[0026] Correcting the scanned image of the target object based on the 0-bit error amount includes: deflecting the scanned image of the target object by a 0-bit error angle to obtain a corrected scanned image.

[0027] According to a third aspect of the present disclosure, a correction device for a scanning device is provided, the correction device comprising a processor and a memory storing program instructions, the processor being configured to execute the correction method for a scanning device provided by the second aspect of the present disclosure when running the program instructions.

[0028] The angle correction component, correction method and device for scanning equipment provided by the embodiments of the present disclosure can achieve the following technical effects:

[0029] In the correction method for scanning equipment provided by the embodiment of the present disclosure, the projection of the centroid line of the two reference parts of the angle correction component used on the reference surface is parallel to the gravity direction. By utilizing this characteristic of the two reference parts, the 0-position error of the tube is calculated by the positional relationship of the reference points of the two reference parts in the tube coordinate system, and the accurate 0-position error of the tube can be obtained. Based on the determined 0-position error, the scanned image of the target object can be corrected, which can effectively improve the image quality and direction accuracy, and significantly reduce the deflection phenomenon of the image.

[0030] The foregoing general description and the following description are exemplary and explanatory only and are not intended to limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0032] Figure 1 is a schematic diagram of a correction system for a scanning device provided by an embodiment of the present disclosure;

[0033] Figure 2 is a structural schematic diagram of an angle correction component provided by an embodiment of the present disclosure;

[0034] Figure 3 The embodiment of the present disclosure provides Figure 2 Side view of

[0035] Figure 4 is a schematic diagram of the relationship between the actual 0 position and the ideal 0 position of a tube of a scanning device provided by an embodiment of the present disclosure;

[0036] Figure 5 is a schematic diagram of a calibration method for a scanning device provided by an embodiment of the present disclosure;

[0037] Figure 6 is a schematic diagram of another calibration method for a scanning device provided by an embodiment of the present disclosure;

[0038] Figure 7 is a schematic diagram of another calibration method for a scanning device provided by an embodiment of the present disclosure;

[0039] Figure 8 It is a schematic diagram of a correction device for a scanning device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0040] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0041] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0042] Unless otherwise stated, the term "plurality" means two or more.

[0043] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0044] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0045] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0046] The present disclosure provides a calibration system for a scanning device, such as Figure 1 As shown, the correction system includes an angle correction component 1000 and a scanning device 2000, and the angle correction component 1000 is arranged in the scanning area of ​​the scanning device 2000. The scanning device 2000 can be a computed tomography (CT) device, a digital subtraction angiography (DSA) device, a digital radiography (DR) device, etc. The scanning device 2000 includes a rack 100, and the rack 100 is equipped with a tube 200 for scanning. The tube 200 can generate X-rays and emit X-rays to the scanned target.

[0047] Combination Figures 1 to 3As shown, the angle correction component 1000 includes a first reference part 1001, a second reference part 1002 and a connecting member 1003. The connecting member 1003 includes a first end and a second end opposite to each other. The first end is connected to the first reference part 1001 in a freely rotatable manner, and the second end is connected to the second reference part 1002. The second reference part 1002 can ensure that the projection of the line connecting the reference points on the first reference part 1001 and the second reference part 1002 on the reference plane is parallel to the gravity direction under the action of gravity, and the reference points on the first reference part 1001 and the second reference part 1002 can be identified in the scanned images of the first reference part 1001 and the second reference part 1002. Here, the reference plane is a virtual plane perpendicular to the rotation axis of the tube 200. The scanned image is obtained by scanning the first reference part and the second reference part by the scanning device 2000 to obtain scanned data after the angle correction component 1000 is set at a suitable position of the scanning device, and then reconstructing the scanned data. It can be understood that the state of the angle correction component 1000 described in the embodiment of the present application is the use state of the angle correction component.

[0048] When the cross-sectional profiles of the first reference portion 1001 and the second reference portion 1002 are regular shapes (such as a cylinder, a sphere, a square, etc.), the reference points of the first reference portion 1001 and the second reference portion 1002 may be the center points of the cross-sectional profiles of the first reference portion 1001 and the second reference portion 1002. The cross-sectional profiles may be reflected on the scanned images of the first reference portion 1001 and the second reference portion 1002.

[0049] In some embodiments, the first reference part 1001 and the second reference part 1002 are cylinders, and the connecting member 1003 can ensure that the axes of the first reference part 1001 and the second reference part 1002 are parallel, and the reference points of the first reference part 1001 and the second reference part 1002 are respectively located on the axes of the first reference part 1001 and the second reference part 1002. When the angle correction component 1000 is set in the scanning area of ​​the scanning device 2000, the axes of the first reference part 1001 and the second reference part 1002 are parallel to the rotation axis of the tube 200. Further, when the angle correction component is placed, the axis of the first reference part 1001 can be colinear with the rotation axis of the tube 200, but it is not necessary.

[0050] In the embodiment of the present disclosure, the first reference part 1001 and the second reference part 1002 are designed as cylinders. Since the reference point of the cylinder can be located at the center point of its cross-sectional profile, it means that the position of the reference point can be calculated more intuitively and accurately, which simplifies the complexity of the algorithm and improves the calculation efficiency. When the first reference part 1001 is fixed and the other second reference part 1002 is freely hanging, the shape of the cylinder facilitates the free rotation design of the connecting part and the first reference part, simplifies the design difficulty of the correction component, and ensures that the relative position relationship between the first reference part 1001 and the second reference part 1002 always meets the design requirements, that is, the projection of the line connecting the reference points of the first reference part 1001 and the second reference part 1002 on the reference surface is parallel to the direction of gravity. The shape of the cylinder has clear boundaries and smooth edges, so it is easier to be accurately identified and located in the image processing stage, thereby improving the accuracy of the measurement.

[0051] In some embodiments, the connecting member 1003 includes a plurality of connecting rods arranged in parallel, the first ends of the plurality of connecting rods are sleeved on the first reference portion 1001 and are spaced apart along the axis direction of the first reference portion 1001, and the second ends of the plurality of connecting rods are sleeved on the second reference portion 1002 and are spaced apart along the axis direction of the second reference portion 1002. The plurality of connecting rods can provide multi-point support, making the reference portion more stable when it is freely hanging. This helps to ensure that the reference portion can accurately hang along the direction of gravity, thereby improving the accuracy of the measurement. Figure 3 For example, the number of the connecting members 1003 is two, and the two connecting members 1003 are arranged in parallel. When the first reference part 1001 and the second reference part 1002 are cylindrical, the first ends of the two connecting rods are sleeved on the first reference part 1001 and are spaced apart along the axis direction of the first reference part 1001, and the second ends of the two connecting rods are sleeved on the second reference part 1002 and are spaced apart along the axis direction of the second reference part 1002.

[0052] In some embodiments, the angle correction assembly 1000 further includes a support 1004, and the support 1004 is fixedly connected to the first reference part 1001. A phantom support is provided on the scanning bed of the scanning device 2000, and the support 1004 can be connected to the phantom support.

[0053] Combination Figure 4 As shown, A represents the actual 0 position of the tube 200, A' represents the ideal 0 position of the tube 200, o represents the rotation axis of the tube 200, and circle C represents the rotation path of the tube 200. The ideal 0 position of the tube 200 is directly above the rotation axis, and the actual 0 position of the tube 200 usually has a certain deviation from the ideal 0 position. The coordinate system xoy is the actual coordinate system of the tube 200, and the coordinate system x'oy' is the ideal coordinate system of the tube 200.

[0054] exist Figure 4 In , (x1, y1) represents the coordinates of the reference point of the first reference part 1001 in the actual coordinate system of the tube 200, and (x2, y2) represents the coordinates of the reference point of the second reference part 1002 in the actual coordinate system of the tube 200. For ease of understanding and description, the x-axis in the coordinate system xoy is defined as the first coordinate axis, and the y-axis in the coordinate system xoy is defined as the second coordinate axis. The first coordinate axis is the coordinate axis in the direction from the tube 200 to the detector, and the second coordinate axis is perpendicular to the first coordinate axis and perpendicular to the rotation axis of the tube 200. x1 and x2 are the coordinate values ​​on the first coordinate axis, and y1 and y2 are the coordinate values ​​on the second coordinate axis.

[0055] The embodiment of the present disclosure provides a correction device 400 for a scanning device, and the correction device 400 can use the scanning device 2000 to obtain a scanned image of a corresponding object. Specifically, the correction device 400 can use the scanning device 2000 to obtain a scanned image of the angle correction component 1000, and determine the 0-bit error amount of the tube 200 based on the scanning device 2000, and then can correct the scanned images of other objects based on the 0-bit error amount.

[0056] In some embodiments, the calibration device 400 may be a part of the scanning device 2000 .

[0057] In combination with the correction system for a scanning device provided in an embodiment of the present disclosure, an embodiment of the present disclosure provides a correction method for a scanning device, and the execution subject of the correction method is a correction device, such as Figure 5 As shown, the calibration method for the scanning device includes:

[0058] S501, the correction device obtains a scanned image of the angle correction component by using a scanning device.

[0059] In the disclosed embodiment, the angle correction component has two reference parts, the projection of the line connecting the reference points of the two reference parts on the reference plane is parallel to the direction of gravity, and the reference plane is a virtual plane perpendicular to the rotation axis of the tube.

[0060] In the embodiment of the present disclosure, the angle correction component is pre-arranged in the scanning area of ​​the scanning device, and the correction component is scanned by the tube and the detector in the frame of the scanning device to obtain scanning data, and the correction device is imaged based on the scanning data to generate a scanning image of the angle correction component. It can be understood that the scanning image includes images of two reference parts.

[0061] S502: The correction device determines the positional relationship between the reference points of the first reference part and the second reference part in the tube coordinate system based on the scanned image of the angle correction component.

[0062] In the embodiment of the present disclosure, the scanned image includes the coordinate values ​​of multiple points of the reference part in the spherical tube coordinate system, and the positional relationship between the reference points of the first reference part and the second reference part in the spherical tube coordinate system is determined based on the coordinate values ​​of the multiple points of the reference part in the spherical tube coordinate system. The spherical tube coordinate system is also the image coordinate system of the scanned image. The positional relationship between the reference points of the first reference part and the second reference part in the scanned image is the positional relationship in the spherical tube coordinate system.

[0063] S503, the calibration device calculates the zero-position error of the tube of the scanning device based on the positional relationship between the reference points of the first reference part and the second reference part.

[0064] In the embodiment of the present disclosure, the 0-position error is the offset of the actual 0-position of the tube relative to the ideal 0-position, and the offset can reflect the degree of offset of the actual 0-position of the tube relative to the ideal 0-position.

[0065] S504, the correction device corrects the scanned image of the target object based on the 0-bit error amount.

[0066] In the correction method for scanning equipment provided by the embodiment of the present disclosure, the projection of the reference point connection line of the two reference parts of the angle correction component used on the reference surface is parallel to the gravity direction. By utilizing this characteristic of the two reference parts, the 0-position error of the tube is calculated by the positional relationship of the center of mass of the two reference parts in the tube coordinate system, and the accurate 0-position error of the tube can be obtained. Based on the determined 0-position error, the scanned image of the target object can be corrected, which can effectively improve the image quality and direction accuracy, and significantly reduce the deflection phenomenon of the image.

[0067] In some embodiments, the tube coordinate system includes a first coordinate axis and a second coordinate axis, wherein the first coordinate axis is a coordinate axis pointing from the tube to the detector, and the second coordinate axis is perpendicular to the first coordinate axis and to the rotation axis of the tube. Figure 4 As shown, the first coordinate axis is the x-axis in the coordinate system xoy, and the second coordinate axis is the y-axis in the coordinate system xoy.

[0068] Based on the scanning image of the angle correction component, the positional relationship between the reference points of the first reference part and the second reference part in the tube coordinate system is determined, including: based on the scanning image of the angle correction component, determining the first coordinate value of the reference points of the first reference part and the second reference part in the first coordinate axis and the second coordinate value in the second coordinate axis.

[0069] In some embodiments, based on the positional relationship between the reference points of the first reference part and the second reference part, the 0-position error amount of the tube of the scanning device is calculated, including: calculating a first difference between the first coordinate values ​​of the reference points of the first reference part and the second reference part; calculating a second difference between the second coordinate values ​​of the reference points of the first reference part and the second reference part; and based on the first difference and the second difference, calculating the 0-position error amount of the tube of the scanning device using a trigonometric function relationship.

[0070] Combination Figure 6 As shown, the embodiment of the present disclosure provides another calibration method for a scanning device, and the calibration method for a scanning device includes:

[0071] S601, the correction device obtains a scanned image of the angle correction component using a scanning device.

[0072] S602: The correction device determines, based on the scanned image of the angle correction component, first coordinate values ​​of reference points of the first reference portion and the second reference portion in the first coordinate axis and second coordinate values ​​in the second coordinate axis.

[0073] In the embodiment of the present disclosure, the first coordinate value of the reference point of the first reference part and the second reference part in the first coordinate axis and the second coordinate value in the second coordinate axis can reflect the positional relationship between the reference points of the first reference part and the second reference part in the spherical tube coordinate system.

[0074] In the embodiment of the present disclosure, the scanned image includes coordinate values ​​of multiple points of the first reference part and the second reference part in the spherical tube coordinate system. Here, the first coordinate value of the reference point of the first reference part in the first coordinate axis and the second coordinate value in the second coordinate axis can be determined based on the coordinate values ​​of the multiple points of the first reference part in the spherical tube coordinate system; the first coordinate value of the reference point of the second reference part in the first coordinate axis and the second coordinate value in the second coordinate axis can be determined based on the coordinate values ​​of the multiple points of the second reference part in the spherical tube coordinate system.

[0075] In some embodiments, the first reference portion and the second reference portion are cylindrical, and based on the scanned image of the angle correction component, determining the first coordinate value of the reference point of the first reference portion and the second reference portion in the first coordinate axis and the second coordinate value in the second coordinate axis includes: based on the scanned image of the angle correction component, obtaining the geometric contour of the first reference portion and the second reference portion on the scanned image; determining the center coordinate value of the geometric contour of the first reference portion and the second reference portion on the scanned image as the first coordinate value of the reference point of the first reference portion and the second reference portion in the first coordinate axis and the second coordinate value in the second coordinate axis.

[0076] The center coordinate value of the geometric contour of the first reference part on the scanned image includes a first coordinate value of the center point in the first coordinate axis and a second coordinate value in the second coordinate axis. The first coordinate value of the center point of the first reference part in the first coordinate axis and the second coordinate value in the second coordinate axis are respectively the first coordinate value of the reference point of the first reference part in the first coordinate axis and the second coordinate value in the second coordinate axis. Here, the first coordinate value of the center point of the first reference part in the first coordinate axis is the average value of the first coordinate values ​​of multiple points of the first reference part in the first coordinate axis; the second coordinate value of the center point of the first reference part in the second coordinate axis is the average value of the second coordinate values ​​of multiple points of the first reference part in the second coordinate axis.

[0077] The center coordinate value of the geometric contour of the second reference part on the scanned image includes a first coordinate value of the center point in the first coordinate axis and a second coordinate value in the second coordinate axis. The first coordinate value of the center point of the second reference part in the first coordinate axis and the second coordinate value in the second coordinate axis are respectively the first coordinate value of the reference point of the second reference part in the first coordinate axis and the second coordinate value in the second coordinate axis. Here, the first coordinate value of the center point of the second reference part in the first coordinate axis is the average value of the first coordinate values ​​of multiple points of the second reference part in the first coordinate axis; the second coordinate value of the center point of the second reference part in the second coordinate axis is the average value of the second coordinate values ​​of multiple points of the second reference part in the second coordinate axis.

[0078] S603, the calibration device calculates a first difference between first coordinate values ​​of reference points of the first reference portion and the second reference portion.

[0079] S604, the calibration device calculates a second difference between second coordinate values ​​of reference points of the first reference portion and the second reference portion.

[0080] S605: The correction device calculates the zero-bit error of the tube of the scanning device based on the first difference and the second difference using a trigonometric function relationship.

[0081] S606, the correction device corrects the scanned image of the target object based on the 0-bit error amount.

[0082] In some embodiments, the 0-position error amount is a 0-position error angle, which is the angle between the actual 0-position of the tube and the ideal 0-position relative to the rotation center. Correcting the scanned image of the target object based on the 0-position error amount includes: deflecting the scanned image of the target object by the 0-position error angle to obtain a corrected scanned image.

[0083] Combination Figure 7 As shown, the embodiment of the present disclosure provides another calibration method for a scanning device, and the calibration method for a scanning device includes:

[0084] S701, the correction device obtains a scanned image of the angle correction component using a scanning device.

[0085] S702: The correction device determines, based on the scanned image of the angle correction component, first coordinate values ​​of reference points of the first reference portion and the second reference portion in the first coordinate axis and second coordinate values ​​in the second coordinate axis.

[0086] S703, the calibration device calculates a first difference between first coordinate values ​​of reference points of the first reference portion and the second reference portion.

[0087] S704, the calibration device calculates a second difference between second coordinate values ​​of reference points of the first reference portion and the second reference portion.

[0088] S705: The correction device calculates the zero-position error angle of the tube of the scanning device based on the first difference and the second difference using a trigonometric function relationship.

[0089] Combination Figure 4 As shown, (x1, y1) represents the coordinates of the reference point of the first reference part in the actual tube coordinate system, and (x2, y2) represents the coordinates of the reference point of the second reference part in the actual tube coordinate system. The 0-position error angle is represented by α, and the 0-position error angle can be calculated by the following formula:

[0090]

[0091] In the above formula, (x2-x1) represents the first difference in the first coordinate values ​​of the reference points of the first reference portion and the second reference portion, and (y2-y1) represents the second difference in the second coordinate values ​​of the reference points of the first reference portion and the second reference portion.

[0092] S706, the correction device deflects the scanned image of the target object by a 0-bit error angle to obtain a corrected scanned image.

[0093] Combination Figure 8 As shown, the embodiment of the present disclosure provides another correction device 400 for a scanning device, and the correction device 400 includes a processor (processor) 401 and a memory (memory) 402. Optionally, the correction device 400 may also include a communication interface (Communication Interface) 403 and a bus 404. Among them, the processor 401, the communication interface 403, and the memory 402 can communicate with each other through the bus 404. The communication interface 403 can be used for information transmission. The processor 401 can call the logic instructions in the memory 402 to execute the correction method for the scanning device of the above embodiment.

[0094] In addition, the logic instructions in the memory 402 described above may be implemented in the form of software functional units and when sold or used as independent products, may be stored in a computer-readable storage medium.

[0095] The memory 402 is a computer-readable storage medium that can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 401 executes the function application and data processing by running the program instructions / modules stored in the memory 402, that is, the calibration method for the scanning device in the above embodiment is implemented.

[0096] The memory 402 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 402 may include a high-speed random access memory and may also include a non-volatile memory.

[0097] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned calibration method for a scanning device.

[0098] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes.

[0099] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0100] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0101] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0102] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. An angle correction component, characterized in that: include: A first reference part, a second reference part and a connecting member, the connecting member includes a first end and a second end opposite to each other, the first end is connected to the first reference part in a freely rotatable manner, the second end is connected to the second reference part, and can ensure that the projection of a line connecting the reference points on the first reference part and the second reference part on the reference plane is parallel to the direction of gravity under the action of gravity, the reference points on the first reference part and the second reference part can be identified in the scanned images of the first reference part and the second reference part, and the reference plane is a virtual plane perpendicular to the rotation axis of the tube.

2. The angle correction assembly according to claim 1, characterized in that: The first reference part and the second reference part are cylinders, the connecting member can ensure that the axes of the first reference part and the second reference part are parallel, and the reference points of the first reference part and the second reference part are respectively located on the axes of the first reference part and the second reference part.

3. The angle correction assembly according to claim 2, characterized in that: The connecting member includes a plurality of connecting rods arranged in parallel, wherein the first ends of the plurality of connecting rods are sleeved on the first reference part and are spaced apart along the axial direction of the first reference part, and the second ends of the plurality of connecting rods are sleeved on the second reference part and are spaced apart along the axial direction of the second reference part.

4. The angle correction assembly according to any one of claims 1 to 3, characterized in that: It also includes a support, which is fixedly connected to the first reference part and is used to connect to the phantom support on the scanning bed.

5. A calibration method for a scanning device, characterized in that: Using the angle correction assembly as described in any one of claims 1 to 4, the method comprises: Acquire a scanned image of the angle correction component using a scanning device; Based on the scanned image of the angle correction component, determining the positional relationship between the reference points of the first reference part and the second reference part in the tube coordinate system; Calculating the 0-position error of the tube of the scanning device based on the positional relationship between the reference points of the first reference part and the second reference part, wherein the 0-position error is the offset of the actual 0-position of the tube relative to the ideal 0-position; The scanned image of the target object is corrected based on the 0-bit error amount.

6. The calibration method according to claim 5, characterized in that: The tube coordinate system includes a first coordinate axis and a second coordinate axis, the first coordinate axis is a coordinate axis pointing from the tube to the detector, and the second coordinate axis is perpendicular to the first coordinate axis and perpendicular to the rotation axis of the tube; Based on the scanning image of the angle correction component, the positional relationship between the reference points of the first reference part and the second reference part in the tube coordinate system is determined, including: based on the scanning image of the angle correction component, determining the first coordinate value of the reference points of the first reference part and the second reference part in the first coordinate axis and the second coordinate value in the second coordinate axis.

7. The calibration method according to claim 6, characterized in that: The first reference portion and the second reference portion are cylindrical; Determining, based on the scanned image of the angle correction component, first coordinate values ​​of reference points of the first reference portion and the second reference portion in the first coordinate axis and second coordinate values ​​in the second coordinate axis, comprising: Based on the scanned image of the angle correction component, acquiring geometric contours of the first reference portion and the second reference portion on the scanned image; The center coordinate values ​​of the geometric outlines of the first reference part and the second reference part on the scanned image are determined as the first coordinate values ​​of the reference points of the first reference part and the second reference part in the first coordinate axis and the second coordinate values ​​in the second coordinate axis.

8. The calibration method according to claim 6, characterized in that: Calculating the zero position error of the tube of the scanning device based on the positional relationship between the reference points of the first reference part and the second reference part includes: Calculate a first difference between first coordinate values ​​of reference points of the first reference portion and the second reference portion; Calculate a second difference between second coordinate values ​​of reference points of the first reference portion and the second reference portion; Based on the first difference and the second difference, a zero-position error amount of the tube of the scanning device is calculated using a trigonometric function relationship.

9. The calibration method according to claim 5, characterized in that: The 0-position error is the 0-position error angle, which is the angle between the actual 0-position of the tube and the ideal 0-position relative to the rotation center. Correcting the scanned image of the target object based on the 0-bit error amount includes: deflecting the scanned image of the target object by a 0-bit error angle to obtain a corrected scanned image.

10. A calibration device for a scanning device, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the calibration method for a scanning device as claimed in any one of claims 5 to 9 when running the program instructions.

Images