General X-ray machine image distortion correction device
By designing a universal X-ray machine image distortion correction device, the combination of calibration plate and base is used to solve the problem of image distortion correction of C-arm X-ray machine image in different models and usage situations, achieving efficient and simple correction effect.
Patent Information
- Application Number
- CN202420919171.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-04-29
AI Technical Summary
The prior art cannot effectively solve the problem of image distortion correction of C-arm X-ray machines in different models and usage situations, and the existing correction devices are complex in use, slow in speed and low in accuracy.
A general-purpose X-ray machine image distortion correction device is designed, including a calibration plate and a base. By placing the correction device between the X-ray source and the imager of the X-ray machine, multiple X-ray images under different working states of the calibration plate are captured by the X-ray machine to generate distortion parameter files, which are used to correct the calibrated X-ray image.
It realizes efficient distortion correction of C-arm X-ray machine images under different models and usage conditions, simplifies the operation process, improves correction efficiency and accuracy, and reduces the impact on the equipment.
Smart Images
Figure CN222939505U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical instruments, in particular to an image distortion correction device and system for a general X-ray machine. Background Art
[0002] In the field of modern medicine, the diagnosis and technical use of X-rays are becoming more and more popular. In recent years, with the increasingly wide application of small C-arm X-ray machines in orthopedic surgeries, doctors are becoming more and more dependent on X-ray images to obtain important information related to patients in real time. Due to its advantages such as convenient use, fast imaging, and relatively small floor space, the C-arm X-ray machine is used in various surgeries to display the actual images of patients during the operation. Since the C-arm X-ray machine often moves the base position and the imaging system vibrates during actual use, its imaging quality also decreases with the use time of the device, and the X-ray images taken will produce a certain degree of distortion, that is, aberration, which causes the positions of each pixel in the original image to shift, does not conform to the perspective imaging law, and results in the image being unable to be applied to high-precision navigation and positioning occasions. Therefore, how to correct or reduce the aberration in the X-ray machine perspective imaging process has also become one of the problems that must be solved by the high-precision navigation and positioning surgical robot system. At the same time, the imaging interfaces of C-arm X-ray machines of various manufacturers are inconsistent, and the generated image resolutions are not completely the same. Therefore, an image distortion correction device applicable to all C-arm X-ray machines is needed.
[0003] Some current correction devices and methods have disadvantages such as complex use processes, slow speeds, and low accuracies, and cannot perform aberration correction on images generated by C-arm X-ray machines of different models and different usage situations. Summary of the Invention
[0004] The technical problem to be solved by the utility model is: to provide a general X-ray machine image distortion correction device, which solves the problems of complex use processes, slow speeds, low accuracies, etc. of the existing correction methods, and cannot perform aberration correction on images generated by C-arm X-ray machines of different models and different usage situations.
[0005] To solve the above technical problems, the utility model adopts the following technical solutions:
[0006] A general X-ray machine image distortion correction device includes a calibration plate and a base. The calibration plate is placed on the base; the calibration plate is movably and adjustably connected to the base, and various working states in which the calibration plate is supported on the base at different angles are obtained by adjusting the calibration plate; by placing the correction device between the X-ray source and the imager of the X-ray machine, multiple X-ray images corresponding to various working states of the calibration plate are collected by using the X-ray machine, and the multiple X-ray images are used to perform aberration correction on the X-ray image to be calibrated.
[0007] In some embodiments, the calibration plate has the property of transmitting X-rays; small balls that do not transmit X-rays or have poor transmission are provided on the front surface of the calibration plate; the small balls are arranged at equal intervals in rows and columns, so that when an X-ray machine is used to photograph the calibration plate, a small ball grid image is formed on the obtained X-ray image.
[0008] In some embodiments, a marking pattern is provided on the front surface of the calibration plate for the user to judge whether the calibration plate is entirely within the shooting range of the X-ray machine when observing the X-ray image, and to provide a direction guide for manually moving and correcting the position of the device; the marking pattern is formed by small balls distributed in a "cross" shape; the small balls arranged in rows and columns are stainless steel balls or tungsten steel balls; the small balls of the marking pattern are stainless steel balls or tungsten steel balls.
[0009] In some embodiments, a connecting portion is provided on the back surface of the calibration plate, and a connecting portion is provided on the top of the base. The connecting portion of the calibration plate is movably connected to the connecting portion of the base, so that the calibration plate is movably connected to the base; the connecting portion of the calibration plate and the connecting portion of the base are protrusions or grooves, and the protrusion is embedded in the groove for relatively movable connection; alternatively, the calibration plate is movably connected to the base by a hinge connection or a pivot.
[0010] In some embodiments, the connecting portion of the calibration plate or the connecting portion of the base is a protrusion, and the protrusion is provided on top of the central support point; the central support point is a hemisphere or an arc body or a curved surface body, and supports between the calibration plate and the base; the protrusion is spherical; the hemisphere or arc body or curved surface body of the central support point is larger in size than the protrusion.
[0011] In some embodiments, a cavity is formed at the center of the top of the base; the cavity is used to accommodate the calibration plate, and is adapted to the calibration plate. The calibration plate is placed on the base in the cavity and can be adjusted to tilt at an angle within the cavity; the cavity is jointly surrounded by side walls and a bottom wall around; the connecting portion of the base is provided at the center of the bottom wall of the cavity; the central support point is provided at the center of the bottom wall of the cavity; a groove is provided on the back surface of the calibration plate, and the protrusion on top of the central support point is embedded in the groove to form a movable connection; the base has the property of transmitting X-rays.
[0012] In some embodiments, the calibration plate is horizontally supported on the base, parallel or flush with the top surface of the base; alternatively, the calibration plate is inclinedly supported on the top of the base, and the inclination angle of the calibration plate is adjustable, so as to obtain working states with various inclination angles. The side of the calibration plate that inclines downward abuts tightly against the support on the base; the calibration plate has a long side and a short side; the long side or the short side provides support to adjust the inclination angle of the calibration plate, so that the X-ray machine can photograph X-ray images of the calibration plate at different angles.
[0013] In some embodiments, on each of the two opposite sides of the top surface of the base, there is provided a sliding support member for supporting the calibration plate to be horizontally placed; the two sliding support members slide relative to the top surface of the base, and the relative sliding is guided and limited by a sliding groove and a positioning post; the two sliding support members slide inward to abut against both sides of the horizontally placed calibration plate to support the calibration plate, and slide outward to disengage from the calibration plate; the sliding groove and the positioning post are respectively arranged on the base and the sliding support member, and the positioning post is inserted into the sliding groove.
[0014] In some embodiments, the calibration plate is a polygon with a long side and a short side; a cavity is provided at the top of the base, and the cavity is jointly surrounded by the upright side walls and the horizontal bottom wall around; the cavity is used to accommodate the calibration plate and is adapted to the calibration plate; the upright side walls and the horizontal bottom wall of the cavity respectively have a long side and a short side, corresponding to the positions of the long side and the short side of the calibration plate; a groove is provided on the back surface of the calibration plate, a central support point protrudes upward from the center of the horizontal bottom wall of the cavity of the base, and a protrusion is provided on the top of the central support point, and the protrusion is embedded in the groove on the back surface of the calibration plate; the calibration plate can swing relative to the base around the protrusion to adjust the tilt angle, and its long side or short side abuts tightly against the corresponding side of the side wall or the bottom wall of the cavity of the base to obtain various working states of the calibration plate placed at various tilt angles.
[0015] The present utility model also provides a general X-ray machine image distortion correction system, including an X-ray machine and a computer control center, the X-ray machine includes an X-ray source and an imager; the computer control center includes a processor and a calibration algorithm module; the system further includes a correction device as described in any one of the above embodiments; the correction device is placed between the X-ray source and the imager; multiple X-ray images corresponding to various working states of the calibration plate are obtained by using the X-ray machine to take pictures; by importing the multiple X-ray images corresponding to various working states of the calibration plate into the calibration algorithm module to generate a distortion parameter file, the processor corrects the distortion of the X-ray image to be calibrated based on the generated distortion parameter file.
[0016] The beneficial effects of the present utility model are:
[0017] The general X-ray machine image distortion correction device of the present utility model is simple, easy to use and highly efficient, reducing the burden on operators, capable of correcting the distortion of images generated by C-arm X-ray machines of different models and different usage situations, and having no impact on the equipment itself, without the need to be installed on the C-arm X-ray machine, improving the accuracy of the images. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1-2 is a perspective view corresponding to the front or back surface of the calibration plate in an embodiment of the present utility model.
[0019] Figure 3-4It is a perspective view of two position states of the sliding support member of the base in the embodiment of the present utility model.
[0020] Figure 5 It is a perspective view of the use state where the calibration plate is horizontally placed in the image distortion correction device of the general X-ray machine in the embodiment of the present utility model.
[0021] Figure 6 It is a perspective view of the use state where the calibration plate is inclined and supported by one of its long sides in the image distortion correction device of the general X-ray machine in the embodiment of the present utility model.
[0022] Figure 7 It is a perspective view of the use state where the calibration plate is inclined and supported by one of its short sides in the image distortion correction device of the general X-ray machine in the embodiment of the present utility model.
[0023] Figure 8 It is a schematic structural diagram of the general X-ray machine image distortion correction system in the embodiment of the present utility model. Detailed implementation manners
[0024] Hereinafter, the exemplary embodiments of the present application will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be fully conveyed to those skilled in the art.
[0025] It should be understood that the terms used herein are only for the purpose of describing specific exemplary embodiments and are not intended to be limiting. Unless otherwise clearly indicated in the context, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, operations, elements, components, and / or combinations thereof.
[0026] Although terms such as first and second may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may only be used to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms do not imply an order or sequence when used herein. Thus, the elements, components, regions, layers, or sections discussed below may be referred to as second elements, components, regions, layers, or sections without departing from the teachings of the exemplary embodiments. For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figure relative to another element or feature, such as "inner", "outer", "inner side", "outer side", "below", "beneath", "above", "over", "front end", "rear side", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is flipped, an element described as "below" or "beneath" another element or feature will then be oriented "above" or "over" the other element or feature. Thus, the exemplary term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are accordingly interpreted.
[0027] Please refer to Figure 1-8 As shown, the present utility model relates to a general X-ray machine image distortion correction device 100 and a system 1000. Among them, the correction device 100 includes a calibration plate 10 and a base 20; the calibration plate 10 can be installed on the base 20 at different angles of inclination. The correction device 100 is placed between the X-ray source 210 and the imager 220 of the X-ray machine 200, and multiple images of the calibration plate 10 in different placement states are obtained by using the X-ray machine for distortion correction of the X-ray images to be calibrated. The correction device 100 of the present utility model obtains multiple X-ray machine captured images for correction by adjusting the different inclination angles of the calibration plate 10 placed on the base 20. The correction device 100 is simple and easy to use, has high efficiency, reduces the burden on the operator, can perform distortion correction on the images generated by C-arm X-ray machines of different models and usage conditions, and has no impact on the device itself. It does not need to be installed on the C-arm X-ray machine, improving the accuracy of the images.
[0028] Among them, the calibration plate 10 has good X-ray penetration performance and can be made of materials such as aluminum alloy and plastic. In some embodiments, the calibration plate 10 is a polygonal flat plate and has a long side 11 and a short side 12 to better utilize space and facilitate adjustment of various tilt angles; the long side 11 or the short side 12 provides support to adjust the tilt angle of the calibration plate 10 so that the X-ray machine can capture X-ray images at different angles. For example, the calibration plate 10 is an octagonal flat plate, which is formed by cutting off the four corners of a square flat plate and has 4 long sides 11 and 4 short sides 12. The long sides 11 and the short sides 12 are connected end to end in sequence. The long side 11 and the short side 12 are respectively used to provide support to adjust the tilt angle of the calibration plate 10 to capture 8 X-ray images at different angles. In this embodiment, the front surface (upper surface or top surface or top) of the calibration plate 10 is polygonal and has a large area, and is photographed with an X-ray machine. In other embodiments, the front surface (upper surface) of the calibration plate 10 may also be circular, elliptical, with a perimeter contour being a curve or an irregular shape. The calibration plate 10 has a small thickness, and the shape and size of its back surface (lower surface) may be the same as or different from those of the front surface.
[0029] Small balls 14 that are X-ray-impermeable or have poor X-ray permeability are embedded in the front surface (upper surface) of the calibration plate 10, such as stainless steel or tungsten steel balls. The small balls 14 are arranged at equal intervals in rows and columns and can be imaged by an X-ray machine. When using an X-ray machine to photograph the calibration plate, a small ball grid image can be obtained. Concave holes can be correspondingly provided on the front surface of the calibration plate 10, and the bottom of each small ball 14 is embedded in the concave hole and clamped, and the bottom of the small ball 14 is fixed in the concave hole by tensioning, welding or bonding. Corresponding to the small balls 14 arranged at equal intervals in rows and columns, the concave holes are arranged at equal intervals in rows and columns. For example, the concave holes are non-through holes through the thickness of the calibration plate. In other embodiments, no concave holes are provided, and the small balls 14 are directly fixed at equal intervals in rows and columns on the front surface of the calibration plate 10, and the fixing method can be welding, bonding or other applicable fixing methods in the prior art. Markings 13 are provided on the front surface of the calibration plate 10. For example, small ball patterns distributed in a "cross" shape are provided at two diagonal corners (not limited to two diagonal corners) on the front surface of the calibration plate 10 as markings 13, so that the user can judge whether the placement of the calibration plate 10 is completely within the shooting range of the X-ray machine when observing the X-ray image, and provide a direction guide for manually moving and correcting the position of the device.
[0030] On the back of the calibration plate 10, there is a connecting portion 15. Corresponding to this, on the top surface of the base 20, there is a connecting portion 25. The connecting portions 15 and 25 cooperate to movably connect the calibration plate 10 to the base 20. For example, the connecting portion 15 on the back of the calibration plate 10 is a groove (it can also be a protrusion), and the connecting portion 25 on the top surface of the base 20 is a protrusion (it can also be a groove). The protrusion is inserted into the groove for movable connection without detachment (not limited to the protrusion being non-detachably connected to the groove, it can be just that the protrusion is inserted into the groove for limited rotational cooperation), enabling the calibration plate 10 to swing and adjust the angle with the connecting portion (protrusion) 25 as the center. The movable connection between the connecting portions 15 / 25 being a protrusion / groove can also adopt hinge connection, shaft connection, or other connection methods to movably connect the calibration plate 10 to the base 20.
[0031] The base 20 is made of a material with good X-ray permeability (such as plastic). On its upper surface, on the left and right (or any) sides, there is a sliding support member 23 each that can support the calibration plate 10 to be placed horizontally. The base 20 is generally frustum-shaped, but not limited to this shape. In the center of the upper surface (or top) of the base 20, there is a cavity 24 formed by the surrounding upright side walls and the horizontal bottom wall together. The cavity 24 is used to accommodate the calibration plate 10, and is adapted to the calibration plate 10, so that when the calibration plate 10 is placed on the base 20, it is located in the cavity 24 and can be adjusted for the tilt angle within the cavity 24. The cavity 24 is adapted to the calibration plate 10 and has a similar shape such as a polygon, but preferably is larger in size than the calibration plate 10 to facilitate the calibration plate 10 to be adjusted for movement within the cavity 24. For example, the cavity 24 is a polygon, and its upright side walls and horizontal bottom wall correspondingly have long sides 21 and short sides 22, corresponding to the long side 11 and short side 12 of the calibration plate 10 in position. The connecting portion (protrusion) 25 on the base 20 is provided at the center of the bottom wall of the cavity 24 and is a protrusion in the upward (the opening at the top of the cavity) direction.
[0032] As an embodiment, a support point 2 is provided at the center of the bottom wall of the cavity 24 of the base 20. The support point 2 protrudes from the center of the bottom wall and is used to support the calibration plate 10. In a non-limiting example, the central support point 2 is a hemisphere or an arc body or a curved surface body, protruding from the center of the bottom wall of the cavity 24. It can be an integral structure with the bottom wall or an independent component installed at the center of the bottom wall; the connecting portion (protrusion) 25 is provided at the central vertex position of the central support point 2 and can be an integral structure with the central support point 2. For example, the connecting portion (protrusion) 25 is a sphere. The central support point (hemisphere or arc body or curved surface body) 2 is larger than the connecting portion (protrusion) 25. The hemispherical or arcuate or curved surface of the larger central support point 2 can be used to form a rolling support for the back surface of the calibration plate 10. When the calibration plate 10 adjusts its angle, the back surface of the calibration plate 10 is supported by the hemispherical or arcuate or curved surface of the central support point 2 and rolls relatively, which is beneficial to the stable movement of the calibration plate 10 and reduces the movement resistance. The shape of the top connecting portion (protrusion) 25 is adapted to the connecting portion (groove) 15 of the calibration plate 10. The protrusion is embedded in the groove and can move relatively and be limited within the groove 15, so that the calibration plate 10 is movably connected to the base 20. The protrusion and the groove can be interchangeably arranged on the calibration plate 10 or the base 20 and connected to each other, so that the calibration plate 10 can swing and adjust at any angle around the protrusion 25 and the groove 15. One corresponding side of the calibration plate 10 and the central cavity 24 of the base abuts against each other, so that the calibration plate 10 is stable in the corresponding inclined state. The back surface of the calibration plate 10 is a plane, or can be provided with an arc or curved surface profile, and makes sliding contact with the lower part of the central support point 2.
[0033] In other embodiments, the central support point 2 and the connecting portion (protrusion) 25 can be provided on the back surface of the calibration plate 10, and the connecting portion (groove) 15 is correspondingly provided on the base 20, specifically at the center of the bottom wall of the cavity 24 of the base 20.
[0034] The sliding support member 23 is a flat slider, which is adapted to the shape of the top edge of the cavity 24 of the base 20, and is slidably mounted on the top edge of the top surface of the base 20. By way of example, the top edge of the top surface of the base 20 is a plane, and the sliding support member 23 is a flat plate, which is horizontally mounted on the top edge of the top surface of the base 20. A sliding guiding structure is provided between the sliding support member 23 and the base 20. By way of example, the sliding guiding structure includes a positioning post 26 provided on one side edge of the base 20 and a sliding groove 230 provided on the sliding support member 23. The positioning post 26 is located within the sliding groove 230. The sliding support member 23 can slide back and forth in a direction close to or away from the cavity 24. When sliding, the positioning post 26 limits the relative movement direction and position of the sliding groove. The sliding direction of the sliding support member 23 is consistent with the setting direction of the sliding groove 24. By way of example, two parallel sliding grooves 230 are provided in the length direction of one sliding support member 23, and the length direction of each sliding groove 230 is perpendicular to the corresponding side of the cavity 24, so that the sliding support member 23 moves back and forth relative to the corresponding side of the cavity 24 along the sliding groove 230. A pair of positioning posts 26 can be provided in each sliding groove 230 to stably guide the sliding of the sliding support member 23. The positioning post 26 preferably has a larger size at the head end than the size of the sliding groove, so as to lock that the sliding support member 23 may not be separated from (but not limited to not being separated from) the edge of the base 20. The positioning post 26 can be a fastener such as a screw. Mounting holes (such as screw holes) are provided at corresponding positions on the edge of the base 20. The fastener (screw) passes through the sliding groove 230 of the sliding support member 23 and is screwed into the mounting hole (screw hole) for fixation. To facilitate the operation of the sliding support member 23, a groove 231 can be provided on the sliding support member 23 to facilitate pushing or pulling the sliding support member 23 with a finger.
[0035] As an embodiment, a pair of sliding support members 23 are respectively provided on the edges of a pair of opposite long sides of the cavity 24 of the base. The inner edge of the sliding support member 23 is adapted to the side surface (long side) of the calibration plate 10, the outer edge is adapted to the side surface (or upper surface) edge of the base 20, and the bottom surface of the sliding support member 23 is adapted to the upper surface (top surface) of the base 20, and can stably slide on the upper surface. When the pair of sliding support members 23 slide inward, they can abut against the opposite sides (long sides) of the calibration plate 10, and when sliding outward, they can keep the outer edge aligned with the side surface of the base 20.
[0036] Refer to Figure 5, in the state where the calibration plate 10 of the correction device 100 is placed horizontally for use, the calibration plate 10 is horizontally placed on the base 20, and the connection part (protrusion) 25 at the top of the central support point 2 is movably connected (embedded) to the connection part (groove) 15 on the back of the calibration plate 10; thereby connecting the calibration plate 10 to the base 20, and being supported by the central support point 2 on the cavity 24, maintaining a horizontal position and being flush (or parallel) with the horizontal surface of the edge of the base 20. Push the sliding support members 23 on both sides of the base 20 inward until they abut against both sides (long sides 11) of the calibration plate 10, so that the calibration plate 10 is maintained in the horizontally placed state for use. Place the correction device 100 between the X-ray source 210 and the imager 220 of the X-ray machine 200, and use the X-ray machine 200 to obtain an image of the calibration plate placed horizontally.
[0037] Refer to Figure 6 , in the state where the calibration plate 10 of the correction device 100 is placed obliquely with one long side supported, the calibration plate 10 is placed obliquely on the base 20 towards one side of the long side 11. The connection part (protrusion) 25 at the top of the central support point 2 is movably connected (embedded) to the connection part (groove) 15 on the back of the calibration plate 10; thereby connecting the calibration plate 10 to the base 20, and being supported by the central support point 2 on the cavity 24, the calibration plate 10 is obliquely supported in the cavity 24, one long side 11 of the calibration plate 10 abuts downward against the corresponding side long side 21 of the cavity 24, and the other side of the calibration plate 10 warps upward, maintaining the inclined state for use. Move the sliding support members 23 on both sides of the base 20 outward to the edge of the upper surface of the base 20. Place the correction device 100 between the X-ray source 210 and the imager 220 of the X-ray machine 200, and use the X-ray machine 200 to obtain an X-ray image of the calibration plate placed obliquely with the long side supported.
[0038] Refer to Figure 7 , in the state where the calibration plate 10 of the correction device 100 is placed obliquely with one short side supported, the calibration plate 10 is placed obliquely on the base 20 towards one side of the short side 12. The connection part (protrusion) 25 at the top of the central support point 2 is movably connected (embedded) to the connection part (groove) 15 on the back of the calibration plate 10; thereby connecting the calibration plate 10 to the base 20, and being supported by the central support point 2 on the cavity 24, the calibration plate 10 is obliquely supported in the cavity 24, one short side 12 of the calibration plate 10 abuts downward against the corresponding side short side 22 of the cavity 24, and the other side of the calibration plate 10 warps upward, maintaining the inclined state for use. Move the sliding support members 23 on both sides of the base 20 outward to the edge of the upper surface of the base 20. Place the correction device 100 between the X-ray source 210 and the imager 220 of the X-ray machine 200, and use the X-ray machine 200 to obtain an X-ray image of the calibration plate placed obliquely with the short side supported.
[0039] Rotate the calibration plate 10 by an angle around the connecting part (protrusion / groove) 25 / 15, use one long side or short side as a support, and use the X-ray machine 200 to take multiple X-ray images of the calibration plate placed obliquely. For example, for a polygonal calibration plate 10 with four long sides 11 and four short sides 12, place the calibration plate 10 on the base 20 for active adjustment, place the correction device 100 between the X-ray source 210 and the imager 220 of the X-ray machine 200, and use the X-ray machine 200 to take 1 image of the calibration plate placed horizontally and 8 X-ray images of the calibration plate placed obliquely.
[0040] Referring to Figure 8 , the present utility model provides a general X-ray machine image distortion correction system 1000, including an X-ray machine 200 and a computer control center 300, the X-ray source 210 and the imager 220 of the X-ray machine 200; the correction device 100 is placed between the X-ray source 210 and the imager 220 of the X-ray machine 200. The computer control center 300 includes a processor 310 and a calibration algorithm module 320. The working principle of the general X-ray machine image distortion correction system is as follows:
[0041] Place the calibration plate 10 on the base 20 and actively adjust it to obtain the working states of the calibration plate placed horizontally or placed obliquely in multiple ways. Place the correction device 100 between the X-ray source 210 and the imager 220 of the X-ray machine 200, use the X-ray machine 200 to take pictures of the calibration plate in different working states, and correspondingly obtain 1 image of the calibration plate placed horizontally and multiple X-ray images of the calibration plate placed obliquely. Finally, import the collected images into the calibration algorithm module 320 of the computer control center 300 to generate a distortion parameter file, and the processor 310 of the computer control center 300 corrects the distortion of the X-ray image to be calibrated based on the generated distortion parameter file. The distortion correction method executed by the calibration algorithm module of the computer control center 300 is a prior art, for example, the Zhang Zhengyou calibration method can be used.
[0042] The correction device 100 and the system 1000 provided by the present utility model are simple to use and highly efficient, reducing the burden on operators. The correction device provided by the present utility model can correct the distortion of images generated by C-arm X-ray machines of different models and different usage situations, and at the same time has no impact on the equipment itself. It does not need to be installed on the C-arm X-ray machine, improving the accuracy of the images.
[0043] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present utility model. The protection scope of the present utility model is defined by the appended claims and their equivalent scope.
Claims
1. A general X-ray machine image distortion correction device, comprising a calibration plate and a base, wherein the calibration plate is placed on the base; characterized in that: The back of the calibration plate is provided with a connection part, and the top of the base is provided with a connection part, and the connection part of the calibration plate is movably connected with the connection part of the base, so that the calibration plate is movably connected to the base; The calibration plate has X-ray transmission performance; small balls that are not X-ray transparent or have poor transmittance are arranged on the front of the calibration plate; the small balls are arranged in rows and columns with equal spacing, so that when the calibration plate is photographed by an X-ray machine, a small ball grid image is formed on the obtained X-ray image; The calibration plate is movably and adjustably connected to the base, and the calibration plate is adjusted to obtain a variety of working states in which the calibration plate is supported on the base at different angles; by placing the correction device between the X-ray source and the imager of the X-ray machine, the X-ray machine is used to capture and collect a plurality of X-ray images corresponding to the various working states of the calibration plate, and the plurality of X-ray images are used to perform distortion correction on the X-ray image to be calibrated.
2. The correction device according to claim 1, characterized in that The front of the calibration plate is provided with a marking pattern, which allows the user to determine whether the calibration plate is completely within the shooting range of the X-ray machine when observing the X-ray image, and provides direction guidance for manually moving the correction device; The marking pattern is formed by small balls distributed in a "cross" shape; The balls arranged in rows and columns are stainless steel balls or tungsten steel balls; the balls marking patterns are stainless steel balls or tungsten steel balls.
3. The correction device according to claim 1, characterized in that The connection part of the calibration plate and the connection part of the base are protrusions or grooves, and the protrusions are embedded in the grooves to be relatively movably connected; or, the calibration plate is movably connected to the base through a hinge connection or an axle.
4. The correction device according to claim 3, characterized in that The connection part of the calibration plate or the connection part of the base is a protrusion, and the protrusion is arranged on the top of the central supporting point; The central support point is a hemisphere, an arc or a curved surface, supported between the calibration plate and the base; The protrusion is spherical; the hemispherical body, arc body or curved body of the central supporting point is larger in size than the protrusion.
5. The correction device according to claim 4, characterized in that A cavity is formed at the top center of the base; the cavity is used to accommodate the calibration plate, and is adapted to the calibration plate. The calibration plate is placed on the base and located in the cavity, and the inclination angle can be adjusted in the cavity; The cavity is surrounded by side walls and a bottom wall; the connecting portion of the base is arranged at the center of the bottom wall of the cavity; The center support point is arranged at the center of the bottom wall of the cavity; the groove is arranged at the back of the calibration plate, and the protrusion at the top of the center support point is embedded in the groove to form a movable connection; The base is X-ray transparent.
6. The correction device according to any one of claims 1 to 5, characterized in that: The various working states of the calibration board include: The calibration plate is supported horizontally on the base, parallel or flush with the top surface of the base; or, The calibration plate is supported obliquely on the top of the base, and the inclination angle of the calibration plate can be adjusted to obtain working states of various inclination angles. The side of the calibration plate that is inclined downward is tightly supported on the base; The calibration plate has a long side and a short side; the long side or the short side provides support to adjust the inclination angle of the calibration plate, so that the X-ray machine can take X-ray images of the calibration plate at different angles.
7. The correction device according to claim 6, characterized in that A sliding support is provided on opposite sides of the top surface of the base for supporting the calibration plate to be placed horizontally; the two sliding supports slide relative to the top surface of the base, and the relative sliding is guided and limited by the slide groove and the positioning column; the two sliding supports slide inwardly to abut against the two sides of the horizontally placed calibration plate to support the calibration plate, and slide outwardly to separate from the calibration plate; The slide groove and the positioning column are respectively arranged on the base and the sliding support member, and the positioning column is inserted into the slide groove.
8. The correction device according to claim 7, characterized in that The calibration plate is a polygon with a long side and a short side; A cavity is provided on the top of the base, and the cavity is surrounded by vertical side walls and a horizontal bottom wall on all sides; the cavity is used to accommodate the calibration plate and is adapted to the calibration plate; The upright side walls and the horizontal bottom wall of the cavity have long sides and short sides corresponding to the positions of the long sides and short sides of the calibration plate; A groove is arranged on the back side of the calibration plate, and a central support point is arranged at the center of the horizontal bottom wall of the base cavity so as to protrude upward. A protrusion is arranged on the top of the central support point, and the protrusion is embedded in the groove on the back side of the calibration plate. The calibration plate can swing relative to the base around the protrusion to adjust the tilt angle, and its long side or short side is tightly supported on the corresponding side of the side wall or bottom wall of the base cavity to obtain various working states of the calibration plate with various tilt angles.