Angle correction assembly, correction method and device for a scanning apparatus

Abstract

The present disclosure relates to the technical field of medical imaging equipment, and discloses an angle correction assembly, a correction method and device for a scanning device. In the angle correction assembly, a first end of a connecting piece is rotatably connected with a first reference part, a second end of the connecting piece is connected with a second reference part, and a line connecting reference points on the first reference part and the second reference part is parallel to the direction of gravity in a projection on a reference surface. The method comprises: acquiring a scanning image of the angle correction assembly by using the scanning device; determining a positional relationship of the reference points of the first reference part and the second reference part in a ball tube coordinate system based on the scanning image of the angle correction assembly; calculating a 0-position error amount of a ball tube of the scanning device based on the positional relationship of the reference points of the first reference part and the second reference part, wherein the 0-position error amount is an offset amount of an actual 0-position of the ball tube relative to an ideal 0-position; and correcting a scanning image of a target object based on the 0-position 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 an apparatus for a scanning device. Background Art

[0002] In modern medical imaging, scanning devices equipped with a tube, such as computed tomography (CT), are widely used in clinical diagnosis. These devices use X-rays generated by the tube to scan specific parts of the target (e.g., a patient), producing a cross-sectional image of that location. Image quality is crucial for clinical diagnosis and directly influences doctors' judgments and treatment decisions.

[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 mechanical installation errors, equipment aging and other factors, 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 leads to inaccurate image reconstruction, which in turn affects the diagnostic 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 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 intended to be an extensive review, nor to identify key / critical elements or to 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 an apparatus 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 surface 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 surface 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 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.

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

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

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

[0013] Determining, based on the scanned image of the angle correction component, a positional relationship between reference points of the first reference portion and the second reference portion in a tube coordinate system;

[0014] Calculating a zero-position error of a tube of the scanning device based on a positional relationship between reference points of the first reference portion and the second reference portion, wherein the zero-position error is an offset of an actual zero position of the tube relative to an ideal zero 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] The position relationship of the reference points of the first reference part and the second reference part in the ball tube coordinate system is determined based on the scan image of the angle correction component, including: determining the first coordinate value of the first reference part and the second reference part in the first coordinate axis and the second coordinate value of the first reference part and the second reference part in the second coordinate axis based on the scan image of the angle correction component.

[0018] In some embodiments, the first reference part and the second reference part are cylindrical, and the first coordinate value of the first reference part and the second reference part in the first coordinate axis and the second coordinate value of the first reference part and the second reference part in the second coordinate axis are determined based on the scan image of the angle correction component, including:

[0019] The geometric profile of the first reference part and the second reference part on the scan image is obtained based on the scan image of the angle correction component.

[0020] The center coordinate value of the geometric profile of the first reference part and the second reference part on the scan image is determined as 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 of the reference points of the first reference part and the second reference part in the second coordinate axis.

[0021] In some embodiments, the 0 position error amount of the ball tube of the scanning device is calculated based on the position relationship of the reference points of the first reference part and the second reference part, including:

[0022] The first difference value of the first coordinate value of the reference points of the first reference part and the second reference part is calculated.

[0023] The second difference value of the second coordinate value of the reference points of the first reference part and the second reference part is calculated.

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

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

[0026] The scan image of the target object is corrected based on the 0 position error amount, including: deflecting the scan image of the target object by the 0 position error angle to obtain the corrected scan 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 the scanning device provided by the second aspect of the present disclosure when the program instructions are executed.

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

[0029] The calibration method for a scanning device provided in the disclosed embodiments employs an angle correction assembly whose projection onto a reference surface of a line connecting the centroids of the two reference components is parallel to the direction of gravity. This characteristic of the two reference components is exploited to calculate the tube's zero-position error based on the positional relationship between the reference points of the two components in the tube coordinate system, thereby accurately obtaining the tube's zero-position error. Based on the determined zero-position error, the scanned image of the target object can be corrected, effectively improving image quality and directional accuracy while significantly reducing image deflection.

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

[0031] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0032] Figure 1 is a schematic diagram of a correction system for a scanning device provided in 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 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 This 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 enable a person skilled in the art to more fully understand the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure is described in detail below with reference to the accompanying drawings, which are only used for reference and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be simplified to facilitate the drawings.

[0041] The terms "first", "second", and the like in the description and claims of the embodiments of the present disclosure and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0042] Unless otherwise specified, the term "a plurality of" means two or more.

[0043] In the embodiments of the present disclosure, the character " / " represents an "or" relationship between the objects before and after it. For example, A / B represents: A or B.

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

[0045] The term "corresponding" can refer to an association relationship or a binding relationship. A and B correspond to each other means that there is an association relationship or a binding relationship between A and B.

[0046] The embodiments of the present disclosure provide a correction system for a scanning device, as shown in Figure 1 The correction system includes an angle correction assembly 1000 and a scanning device 2000, and the angle correction assembly 1000 is arranged in a 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 gantry 100 configured with a ball tube 200 for scanning. The ball tube 200 can generate X-rays and emit X-rays to a scanned target.

[0047] In combination with Figures 1 to 3As shown, the angle correction assembly 1000 comprises a first reference part 1001, a second reference part 1002, and a connecting part 1003. The connecting part 1003 comprises opposite first and second ends. The first end is rotatably connected to the first reference part 1001, and the second end is connected to the second reference part 1002. The second reference part 1002 is configured to be able to ensure that, under the action of gravity, the projection of the line connecting the reference points on the first reference part 1001 and the second reference part 1002 on a reference plane is parallel to the direction of gravity. The reference points on the first reference part 1001 and the second reference part 1002 can be identified in the scan image 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 ball tube 200. The scan image is obtained by setting the angle correction assembly 1000 at a suitable position of the scanning device 2000, scanning the first reference part and the second reference part by the scanning device 2000, and then performing image reconstruction on the scan data. It can be understood that the state of the angle correction assembly 1000 described in the embodiments of the present application is the use state of the angle correction assembly.

[0048] When the cross-sectional profiles of the first reference part 1001 and the second reference part 1002 are regular shapes (such as cylinders, spheres, and squares, etc.), the reference points of the first reference part 1001 and the second reference part 1002 can be the center points of the cross-sectional profiles of the first reference part 1001 and the second reference part 1002, respectively. The cross-sectional profiles can be reflected in the scan images of the first reference part 1001 and the second reference part 1002.

[0049] In some embodiments, the first reference part 1001 and the second reference part 1002 are cylinders, and the connecting part 1003 can ensure that the axes of the first reference part 1001 and the second reference part 1002 are parallel. The reference points of the first reference part 1001 and the second reference part 1002 are located on the axes of the first reference part 1001 and the second reference part 1002, respectively. When the angle correction assembly 1000 is set in the scanning region 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 ball tube 200. Further, when the angle correction assembly is placed, the axis of the first reference part 1001 can be collinear with the rotation axis of the ball 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, this 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 being sleeved on the first reference portion 1001 and spaced apart along the axis of the first reference portion 1001, and the second ends of the plurality of connecting rods being sleeved on the second reference portion 1002 and spaced apart along the axis of the second reference portion 1002. The plurality of connecting rods can provide multi-point support, making the reference portion more stable when freely hanging. This helps ensure that the reference portion can accurately hang along the direction of gravity, thereby improving the accuracy of the measurement. Figure 3 For example, there are two connecting members 1003, which are arranged in parallel. When the first reference portion 1001 and the second reference portion 1002 are cylindrical, the first ends of the two connecting rods are sleeved on the first reference portion 1001 and spaced apart along the axis of the first reference portion 1001. The second ends of the two connecting rods are sleeved on the second reference portion 1002 and spaced apart along the axis of the second reference portion 1002.

[0052] In some embodiments, the angle correction assembly 1000 further includes a support 1004, which is fixedly connected to the first reference portion 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] Combine Figure 4 As shown, A represents the actual zero position of tube 200, A' represents the ideal zero position of tube 200, o represents the rotation axis of tube 200, and circle C represents the rotation path of tube 200. The ideal zero position of tube 200 is directly above the rotation axis. The actual zero position of tube 200 typically deviates from the ideal zero position. Coordinate system xoy represents the actual coordinate system of tube 200, and coordinate system x'oy' represents the ideal coordinate system of tube 200.

[0054] exist Figure 4 In this example, (x1, y1) represents the coordinates of the reference point of first reference unit 1001 in the actual coordinate system of tube 200, and (x2, y2) represents the coordinates of the reference point of second reference unit 1002 in the actual coordinate system of tube 200. For ease of understanding and description, the x-axis in coordinate system xoy is defined as the first coordinate axis, and the y-axis in coordinate system xoy is defined as the second coordinate axis. The first coordinate axis is the axis pointing from tube 200 toward the detector, and the second coordinate axis is perpendicular to the first coordinate axis and to the rotation axis of 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 present disclosure provides a calibration device 400 for a scanning device. Calibration device 400 can utilize scanning device 2000 to obtain a scanned image of a corresponding object. Specifically, calibration device 400 can utilize scanning device 2000 to obtain a scanned image of angle calibration assembly 1000, determine the zero-bit error of tube 200 based on the scanned image obtained by scanning device 2000, and subsequently calibrate scanned images of other objects based on the zero-bit error.

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

[0057] In combination with the calibration system for a scanning device provided in an embodiment of the present disclosure, an embodiment of the present disclosure provides a calibration method for a scanning device, the calibration method is performed by a calibration 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 using a scanning device.

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

[0060] In the disclosed embodiment, the angle correction assembly is pre-placed within the scanning area of ​​a scanning device. The correction assembly is scanned using a tube and detector within the scanning device's gantry to obtain scan data. The correction device then creates an image based on the scan data to generate a scanned image of the angle correction assembly. It will be appreciated that the scanned image includes images of two reference portions.

[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 disclosed embodiment, the scanned image includes coordinate values ​​of multiple points on the reference portion in the spherical tube coordinate system. The positional relationship between the reference points of the first reference portion and the second reference portion in the spherical tube coordinate system is determined based on the coordinate values ​​of the multiple points on the reference portion 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 portion and the second reference portion within the scanned image is also 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 zero-position error is the offset of the actual zero position of the tube relative to the ideal zero position. The offset can reflect the degree of offset of the actual zero position of the tube relative to the ideal zero position.

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

[0066] The calibration method for a scanning device provided in the disclosed embodiments employs an angle correction assembly in which the projection of the line connecting the reference points of the two reference parts onto the reference surface is parallel to the direction of gravity. This characteristic of the two reference parts is exploited to calculate the tube's zero-position error based on the positional relationship between the two reference parts' centers of mass in the tube coordinate system, thereby accurately obtaining the tube's zero-position error. Based on the determined zero-position error, the scanned image of the target object can be corrected, effectively improving image quality and directional accuracy while significantly reducing image deflection.

[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 perpendicular 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, the 0-position error amount of the tube of the scanning device is calculated based on the positional relationship between the reference points of the first reference part and the second reference part, 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 calculating the 0-position error amount of the tube of the scanning device using a trigonometric function relationship based on the first difference and the second difference.

[0070] Combine Figure 6 As shown, an embodiment of the present disclosure provides another calibration method for a scanning device, the calibration method for a scanning device comprising:

[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 an 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, 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 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 second 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.

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

[0076] The center coordinate value of the geometric outline 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 outline 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 the second coordinate values ​​of the 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 zero-position error is a zero-position error angle, which is the angle between the actual zero-position of the tube and the ideal zero-position relative to the rotation center. Correcting the scanned image of the target object based on the zero-position error includes: deflecting the scanned image of the target object by the zero-position error angle to obtain a corrected scanned image.

[0083] Combine Figure 7 As shown, an embodiment of the present disclosure provides another calibration method for a scanning device, the calibration method for a scanning device comprising:

[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 the second coordinate values ​​of the 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] Combine Figure 4 As shown, (x1, y1) represents the coordinates of the reference point of the first reference part in the actual spherical tube coordinate system, and (x2, y2) represents the coordinates of the reference point of the second reference part in the actual spherical tube coordinate system. The zero-position error angle is represented by α, and the zero-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 part and the second reference part, and (y2-y1) represents the second difference in the second coordinate values ​​of the reference points of the first reference part and the second reference part.

[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] Combine Figure 8 As shown, an embodiment of the present disclosure provides another calibration device 400 for a scanning device. The calibration device 400 includes a processor 401 and a memory 402. Optionally, the calibration device 400 may further include a communication interface 403 and a bus 404. The processor 401, the communication interface 403, and the memory 402 may communicate with each other via the bus 404. The communication interface 403 may be used for information transmission. The processor 401 may call the logic instructions in the memory 402 to execute the calibration method for the scanning device of the above embodiment.

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

[0095] Memory 402, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of the present disclosure. Processor 401 executes the program instructions / modules stored in memory 402 to perform functional applications and data processing, thereby implementing the calibration method for a scanning device in the above-described embodiments.

[0096] Memory 402 may include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function; the data storage area may store data generated based on the use of the terminal device. Memory 402 may also include high-speed random access memory and 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 solutions of the embodiments of the present disclosure may 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 embodiments of the present disclosure. The aforementioned storage medium may be a non-transitory storage medium, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, among other media capable of storing program code.

[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 variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace 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 claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include plural forms. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of one or more associated listings. In addition, when used in this application, the term "comprise" and its variations "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 of these. In the absence of further restrictions, an element defined by the sentence "comprising a..." does not exclude the presence of other identical elements in the process, method or device that includes the element. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments can be referenced 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 be found in 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 to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. The technicians will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can 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 merely illustrative. For example, the division of the units can be merely a logical functional division. In actual implementation, there may be other division methods, 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, and can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown 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 to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of the present disclosure may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0102] The flowcharts and block diagrams in the accompanying drawings show the possible implementation architectures, functions and operations of the systems, methods and computer program products according to the embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, program segment or part of the code, and the module, program segment or part of the code contains one or more executable instructions for implementing the specified logical functions. In some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in an order different from that 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, or 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 function or action, 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 relative to each other, the first end is freely rotatably connected to the first reference part, and the second end is connected to the second reference part, and can ensure that the projection of the line connecting the reference points on the first reference part and the second reference part on the reference surface is parallel to the direction of gravity under the action of gravity, and 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 surface 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 piece 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, 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 according to any one of claims 1 to 4, the method comprises: Acquiring a scanned image of the angle correction component using a scanning device; Determining, based on the scanned image of the angle correction component, a positional relationship between reference points of the first reference portion and the second reference portion in a tube coordinate system; Calculating a zero-position error of the tube of the scanning device based on a positional relationship between reference points of the first reference portion and the second reference portion, wherein the zero-position error is an offset of an actual zero position of the tube relative to an ideal zero 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, wherein: The first reference portion and the second reference portion are cylindrical; Determining, based on the scanned image of the angle correction component, a first coordinate value of a reference point of the first reference portion and the second reference portion in the first coordinate axis and a second coordinate value in the second coordinate axis, comprising: Based on the scanned image of the angle correction component, obtaining 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 portion and the second reference portion on the scanned image are determined 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.

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

9. The calibration method according to claim 5, wherein: 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 according to any one of claims 5 to 9 when running the program instructions.

Images