Image precision evaluation ruler for radiation

Abstract

The utility model discloses an image precision evaluation ruler for radiation, which comprises a transparent plastic ruler capable of being used in cooperation with lying imaging and standing imaging, and the surface of the transparent plastic ruler is provided with scale grooves and number grooves which are distributed at intervals in the length direction of the transparent plastic ruler. The scale grooves and the number grooves are filled with metal substances capable of absorbing X-rays. The two supporting devices are supported below the two ends of a transparent plastic ruler which is used in cooperation with lying imaging, so that the transparent plastic ruler is in a transverse inclined state according to the characteristics of the legs of the patient; and the vertical clamping device is used for clamping and fixedly matching with a transparent plastic ruler used for standing imaging so as to enable the transparent plastic ruler to be in a vertical state. According to the image precision evaluation ruler for radiation, clinical radiation technicians and doctors can intuitively judge the imaging effect and the splicing precision of images, and the phenomena of overlapping, missing, distortion and the like of spliced images are effectively prevented.

Description

Technical Field

[0001] This utility model relates to a ruler for evaluating the accuracy of radiographic images. Background Technology

[0002] During joint replacement surgery, it is often necessary to assess the patient's bone condition and the postoperative effect of the artificial joint. However, limitations imposed by the flat-panel detector and X-ray tube beam coverage of digital radiography (DR) systems prevent this from being completed in a single exposure. Current solutions involve stitching together two conventional DR images taken from different angles. This raises the issue of evaluating the accuracy of the stitching, as the different beam angles of the X-ray tubes in the two exposures can lead to overlapping, missing images, and distortion in the stitched image.

[0003] Therefore, it is necessary to design a precision evaluation scale for radiographic images to improve the aforementioned shortcomings. Utility Model Content

[0004] The purpose of this invention is to provide a ruler for evaluating the accuracy of radiographic images, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides a radiographic image accuracy evaluation ruler, including a transparent plastic ruler with an accuracy of 0.5-1cm that can be used for both lying and standing imaging. The surface of the transparent plastic ruler is provided with graduated grooves and numerical grooves that are spaced apart along the length of the transparent plastic ruler. Each graduated groove and each numerical groove is filled with a metallic substance that can absorb X-rays.

[0006] Two height-adjustable support devices are provided, which are positioned below both ends of a transparent plastic ruler used in conjunction with supine imaging, allowing the ruler to tilt laterally according to the patient's leg characteristics; and

[0007] A vertical clamping device is provided, which clamps and fixes a transparent plastic ruler used for standing imaging so that the transparent plastic ruler is in a vertical position.

[0008] Preferably, the transparent plastic ruler includes an imaging layer and a reinforcing layer located on both sides of the imaging layer. Both the imaging layer and the reinforcing layer are made of transparent acrylic material, and the scale groove and the number groove are distributed on one side of the imaging layer.

[0009] Preferably, each of the two support devices includes an upper plate, a lower plate, two upper scissor lifting arms, two lower scissor lifting arms, two horizontal connecting rods, and a horizontal drive rod. One upper end of each of the two upper scissor lifting arms is hinged to the upper plate, and the other upper end of each upper scissor lifting arm is slidably limited within an upper groove on the upper plate. One lower end of each of the two lower scissor lifting arms is hinged to the lower plate, and the other lower end of each lower scissor lifting arm is slidably limited within a lower groove on the lower plate. The two horizontal connecting rods are located between the two upper scissor lifting arms and simultaneously between the two lower scissor lifting arms. Each horizontal connecting rod has its two ends connected to a lower end of one upper scissor lifting arm and an upper end of one lower scissor lifting arm, respectively. The horizontal drive rod vertically passes through the two horizontal connecting rods and is threadedly connected to them. An anti-slip elastic pad is fixed to the top surface of each upper plate, and the anti-slip elastic pads of the two support devices are at different heights. The metal material is tin, lead, or iron.

[0010] Preferably, the surface of each of the anti-slip elastic pads is distributed with toothed anti-slip textures.

[0011] Preferably, L-shaped plates are fixed on both sides of the bottom surface of the upper plate, and the L-shaped plates on both sides of the bottom surface of the upper plate are arranged in opposite directions. One upper end of the two upper scissor lifting arms is hinged to the vertical part of the corresponding L-shaped plate, and the other upper end of the two upper scissor lifting arms is slidably limited in the upper sliding groove on the vertical part of the corresponding L-shaped plate. A fixing member is fixed on the outer side of the vertical part of the L-shaped plate. The fixing member is rotatably connected to a connecting member. The connecting member is connected to a universal connection structure through a folding connecting member. The universal connection structure is connected to a clamping member. The inner wall of the clamping member is also provided with an elastic soft pad. The clamping member is located on one side of the anti-slip elastic soft pad on the top surface of the upper plate along the lying direction of the transparent plastic ruler.

[0012] Preferably, the fixing member includes a main body and a fixing arm extending vertically from one side of the main body. The upper and lower fixing arms are respectively fixed on the vertical part of the L-shaped plate on the upper and lower sides of the upper slide groove. The main body is rotatably connected to the connecting member. The other opposite side of the main body is a convex arc surface, and the connecting member has a concave arc surface that matches the convex arc surface.

[0013] Preferably, the folding connector includes two folding plates. The connector is damped and rotatably connected to one end of one folding plate, and the other end of the folding plate is damped and rotatably connected to one end of the other folding plate. The universal connection structure is fixedly connected to the other folding plate. The universal connection structure includes a first connecting post, a second connecting post, and a universal ball joint. The two ends of the first connecting post are fixedly connected to the universal ball joint and the other folding plate, respectively. The universal ball joint is limited within one end of the second connecting post, and the other end of the second connecting post is fixedly connected to the clamping member.

[0014] Preferably, the clamping member includes a base plate and two side plates connecting opposite sides of the base plate. The two side plates have corresponding holes. There are two arc-shaped elastic metal sheets between the two side plates. The elastic pads are provided on the opposite surfaces of the two arc-shaped elastic metal sheets and the top surface of the base plate. One end of each of the two arc-shaped elastic metal sheets is fixed to one end of the inner surface of the two side plates. The other end of each of the two arc-shaped elastic metal sheets is bent in the opposite direction and extends into a bent portion. The two bent portions pass through the corresponding holes and extend out of the two side plates. An operating part is fixed at the end of the two bent portions extending out of the two side plates. Multiple elastic locking plates are fixed at intervals on the two opposite side walls of each hole. A locking groove is formed between adjacent elastic locking plates. A locking part that can be selectively locked in the corresponding locking groove is fixed on the bent portion.

[0015] Preferably, each of the elastic plates is inclined toward the outside of the side plate.

[0016] Preferably, the vertical clamping device includes two L-shaped clamps arranged in opposite directions, with a clamping groove formed between the vertical portions of the two L-shaped clamps. The lower end of a vertically positioned transparent plastic ruler is inserted into the clamping groove. Each L-shaped clamp has horizontally spaced openings on its vertical portion. The openings on the vertical portions of the two L-shaped clamps correspond one-to-one, and bolts are inserted through two sets of corresponding openings. Each bolt is screwed with a locking nut.

[0017] Compared with the prior art, the beneficial effects of the image accuracy evaluation ruler for radiography of this utility model are as follows:

[0018] (1) A transparent plastic ruler with a scale groove and a digital groove is used. The transparent plastic ruler has an evaluation scale with an accuracy of 0.5-1cm and a scale digital display. When used with two height-adjustable support devices and a vertical clamping device, the scale and numerical information of the transparent plastic ruler can be clearly seen in the stitched image, so that clinical radiographers and doctors can intuitively judge the image imaging effect and stitching accuracy, effectively preventing the stitched image from overlapping, missing, or distorted.

[0019] (2) The scale groove and the number groove are filled with tin or lead, so that they can absorb a large amount of X-rays.

[0020] (3) A reinforcing layer is used to increase the mechanical strength and drop resistance of the transparent plastic ruler, preventing it from breaking due to drops. At the same time, the multi-layer design also reduces the bending deformation coefficient of the transparent plastic ruler, making the transparent plastic ruler more rigid and increasing the accuracy of evaluating imaging performance.

[0021] (4) The height of the anti-slip elastic pads of the two support devices is different so that the transparent plastic ruler is in a horizontal tilt state. The height of the two support devices is adjustable, so that the height of the upper plate and anti-slip elastic pads of the two support devices can be adjusted according to the leg characteristics of different patients, so as to make the transparent plastic ruler infinitely tilted and adjusted so that the transparent plastic ruler 1 is parallel to or at the same horizontal tilt angle as the patient's leg.

[0022] (5) The vertical clamping device can be used to stand the transparent plastic ruler upright next to the patient without the patient's support, which is beneficial for patients with difficulty walking or weak lifting strength to use for imaging; the lower end of the transparent plastic ruler can be inserted into the clamping groove and can be swung left and right to adjust the angle between the ruler and the patient's body, so as to achieve the parallelism between the ruler and the joint of the lesion, which is very convenient to adjust.

[0023] (6) The use of fasteners, connectors, folding connectors and universal connection structure allows the height and angle of the clamp to be adjusted as needed. The use of clamps can effectively prevent the transparent plastic rulers placed on the two support devices at different heights from falling off.

[0024] (7) The operating part, bending part, arc-shaped elastic metal sheet, elastic plate and holding part are used to adjust and fix the distance between the two arc-shaped elastic metal sheets to fix or loosen the transparent plastic ruler.

[0025] The present invention will become clearer from the following description and in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention. Attached Figure Description

[0026] Figure 1 This is a side view of the support device of this utility model.

[0027] Figure 2 This is a front view of the support device.

[0028] Figure 3 This is a schematic diagram showing the connection between the support device and the fixing parts, connectors, folding connectors, universal connection structures, and clamping parts.

[0029] Figure 4 This is a schematic diagram showing a transparent plastic ruler placed at different heights on two support devices.

[0030] Figure 5 A schematic diagram of the combination of fasteners, connectors, folding connectors, universal joint structures, and clamping components. Figure 1 .

[0031] Figure 6 A schematic diagram of the combination of fasteners, connectors, folding connectors, universal joint structures, and clamping components. Figure 2 .

[0032] Figure 7This is a schematic diagram of the clamping component.

[0033] Figure 8 for Figure 7 A magnified view of position A in the middle.

[0034] Figure 9 This is a schematic diagram of a transparent plastic ruler.

[0035] Figure 10 A diagram illustrating the combination of a transparent plastic ruler and a vertical clamping device. Figure 1 .

[0036] Figure 11 A diagram illustrating the combination of a transparent plastic ruler and a vertical clamping device. Figure 2 .

[0037] Attached figures and symbols: 1. Transparent plastic ruler; 11. Scale groove; 12. Number groove; 13. Imaging layer; 14. Reinforcing layer; 2. Support device; 21. Upper plate; 211. Upper sliding groove; 221. Lower plate; 221. Lower sliding groove; 23. Upper scissor lifting arm; 24. Lower scissor lifting arm; 25. Horizontal connecting rod; 26. Horizontal drive rod; 27. Anti-slip elastic pad; 28. L-shaped plate; 3. Vertical clamping device; 31. L-shaped clamping plate; 31. Opening; 32. Clamping groove; 33. Bolt; 34. Nut; 4. Fixing component; 41. Main body; 42. Fixing arm; 5. Connecting component; 6. Folding connecting component; 61. Folding plate; 7. Universal connection structure; 71. Connecting column one; 72. Connecting column two; 73. Universal ball head; 8. Clamping component; 81. Base plate; 82. Side plate; 83. Channel; 84. Arc-shaped elastic metal sheet; 85. Bending part; 851. Holding part; 86. Operating part; 87. Elastic clamping plate; 871. Detailed Implementation

[0038] Embodiments of the present invention will now be described with reference to the accompanying drawings, in which similar element reference numerals represent similar elements.

[0039] Please refer to Figure 1-11 The aforementioned image accuracy evaluation ruler for radiography includes a transparent plastic ruler 1 with an accuracy of 0.5-1cm that can be used for both lying and standing imaging, two height-adjustable support devices 2, and a vertical clamping device 3.

[0040] The transparent plastic ruler 1 has graduated grooves 11 and number grooves 12 spaced along its length. Each groove 11 and each number groove 12 is filled with a metal substance that absorbs X-rays. The metal substance is tin, lead, or iron. Tin, lead, or iron can absorb large amounts of X-rays, resulting in a black appearance on the medical imaging device. The absorbed areas are represented as text or graduations in the image. The numbers and graduations on the transparent plastic ruler 1 are displayed on the image. The transparent plastic ruler 1 includes an imaging layer 13 and reinforcing layers 14 on both sides of the imaging layer 13. The reinforcing layers 14 increase the mechanical strength and drop resistance of the transparent plastic ruler 1, preventing breakage due to drops. The multi-layer design also reduces the bending deformation coefficient of the transparent plastic ruler 1, making it more rigid and increasing the accuracy of evaluating imaging performance. Both the imaging layer 13 and the reinforcing layer 14 are made of transparent acrylic or other transparent high-strength materials. The graduated grooves 11 and number grooves 12 are located on one side of the imaging layer 13.

[0041] The two support devices 2 are supported below both ends of the transparent plastic ruler 1 used for supine imaging, so that the transparent plastic ruler 1 is in a horizontally tilted state according to the characteristics of the patient's legs. Each of the two support devices 2 includes an upper plate 21, a lower plate 22, two upper scissor lifting arms 23, two lower scissor lifting arms 24, two horizontal connecting rods 25, and a horizontal drive rod 26. One upper end of each of the two upper scissor lifting arms 23 is hinged to the upper plate 21, and the other upper end of each of the two upper scissor lifting arms 23 is slidably limited in the upper sliding groove 211 of the upper plate 21. One lower end of each of the two lower scissor lifting arms 24 is hinged to the lower plate 22, and the other lower end of each of the two lower scissor lifting arms 24 is slidably limited in the lower sliding groove 221 of the lower plate 22. Two horizontal connecting rods 25 are located between the two upper scissor lifting arms 23 and simultaneously between the two lower scissor lifting arms 24. Each horizontal connecting rod 25 is connected to one lower end of an upper scissor lifting arm 23 and one upper end of a lower scissor lifting arm 24 at both ends. A horizontal drive rod 26 passes vertically through the two horizontal connecting rods 25 and is threadedly connected to the two horizontal connecting rods 25. By rotating the horizontal drive rod 26, the two upper scissor lifting arms 23 and the two lower scissor lifting arms 24 can be raised or lowered, thereby adjusting the height of the upper plate 21 and the anti-slip elastic pad 27. Each upper plate 21 has a non-slip elastic pad 27 fixed to its top surface. The heights of the non-slip elastic pads 27 on the two support devices 2 are different, so that the transparent plastic ruler 1 is in a horizontally tilted state. The heights of the upper plates 21 and the non-slip elastic pads 27 on the two support devices 2 can be adjusted according to the leg characteristics of different patients, so as to infinitely adjust the tilt angle of the transparent plastic ruler 1, so that the transparent plastic ruler 1 is parallel to or at the same horizontal angle as the patient's leg. The surface of each non-slip elastic pad 27 is distributed with toothed anti-slip texture to prevent the transparent plastic ruler 1 from sliding and falling off due to the different heights of the non-slip elastic pads 27 on the two support devices 2.

[0042] The vertical clamping device 3 clamps and fixes the transparent plastic ruler 1 used for standing imaging, so that the transparent plastic ruler 1 is in an upright state. The vertical clamping device 3 includes two L-shaped clamps 31, which are arranged in opposite directions. A clamping groove 32 is formed between the vertical parts of the two L-shaped clamps 31. The lower end of the upright transparent plastic ruler 1 is inserted into the clamping groove 32. Each L-shaped clamp 31 has horizontally spaced openings 311 on its vertical part. The openings 311 of the vertical parts of the two L-shaped clamps 31 are one-to-one, and bolts 33 are inserted through two sets of corresponding openings 311. Each bolt 33 is screwed with a locking nut 34. The transparent plastic ruler 1 is erected next to the patient by the two L-shaped clamps 31 in conjunction with the bolts 33 and nuts 34, without the need for the patient's support, which is beneficial for patients with difficulty walking or weak lifting strength to use for imaging. The lower end of the transparent plastic ruler 1 can be inserted into the clamping groove 32 and can be swung left and right to adjust the angle between the ruler and the patient's body, so as to make the ruler parallel to the joint of the lesion. The adjustment is very convenient.

[0043] L-shaped plates 28 are fixed to both sides of the bottom surface of the upper plate 21. The L-shaped plates 28 on both sides of the bottom surface of the upper plate 21 are arranged in opposite directions. One upper end of each of the two upper scissor lifting arms 23 is hinged to the vertical part of the corresponding L-shaped plate 28. The other upper end of each of the two upper scissor lifting arms 23 is slidably limited in the upper sliding groove 211 on the vertical part of the corresponding L-shaped plate 28. A fixing member 4 is fixed to the outer side of the vertical part of the L-shaped plate 28. The fixing member 4 is rotatably connected to a connecting member 5. The connecting member 5 can be rotated and adjusted by the rotatable connection. The connecting member 5 is connected to a universal connection structure 7 through a folding connecting member 6. The universal connection structure 7 is connected to a clamping member 8. The clamping member 8 can be universally adjusted in angle through the universal connection structure 7. The height of the clamping member 8 can be adjusted by the folding connecting member 6. The inner wall of the clamping member 8 is also provided with an elastic soft pad. The clamping member 8 is located on one side of the anti-slip elastic soft pad 27 on the top surface of the upper plate 21 along the lying direction of the transparent plastic ruler 1. By clamping the transparent plastic ruler 1 with the clamping member 8, it is possible to further prevent the transparent plastic ruler 1, which is placed on the two support devices 2 at different heights, from falling off.

[0044] The fixing member 4 includes a main body 41 and a fixing arm 42 extending vertically from one side of the main body 41. The upper and lower fixing arms 42 are respectively fixed on the vertical part of the L-shaped plate 28 on the upper and lower sides of the upper slide groove 211. The main body 41 is rotatably connected to the connecting member 5. The other opposite side of the main body 41 is a convex arc surface. The connecting member 5 has a concave arc surface that matches the convex arc surface, ensuring that the connecting member 5 rotates smoothly.

[0045] A folding connector 6 of a support device 2 includes two folding plates 61. The connector 5 is damped and rotatably connected to one end of one folding plate 61, and the other end of the folding plate 61 is damped and rotatably connected to one end of the other folding plate 61. The universal connection structure 7 is fixedly connected to the other folding plate 61.

[0046] Another support device 2 has a folding connector 6 including multiple folding plates 61. The connector 5 is damped and rotatably connected to one end of the lowermost folding plate 61. The other end of the lowermost folding plate 61 is damped and rotatably connected to one end of the adjacent upper folding plate 61. One end of each upper folding plate 61 is damped and rotatably connected to one end of the lower folding plate 61. The other end of each upper folding plate 61 is damped and rotatably connected to one end of the upper folding plate 61. The universal connection structure 7 is fixedly connected to the uppermost folding plate 61.

[0047] The universal connection structure 7 includes a first connecting post 71, a second connecting post 72, and a universal ball joint 73. The two ends of the first connecting post 71 are fixedly connected to the universal ball joint 73 and another folding plate 61, respectively. The universal ball joint 73 is limited within one end of the second connecting post 72, and the other end of the second connecting post 72 is fixedly connected to the clamping member 8.

[0048] The clamping member 8 includes a base plate 81 and two side plates 82 connecting opposite sides of the base plate 81. Corresponding holes 83 are formed on the two side plates 82. Two arc-shaped elastic metal sheets 84 are located between the two side plates 82. Elastic pads are provided on the opposing surfaces of the two arc-shaped elastic metal sheets 84 and on the top surface of the base plate 81, protecting the transparent plastic ruler 1 when in contact with it. One end of each of the two arc-shaped elastic metal sheets 84 is fixed to one end of the inner surface of each of the two side plates 82. The other ends of each arc-shaped elastic metal sheet 84 are bent in the opposite direction, extending with bent portions 85. The two bent portions 85 pass through the corresponding holes 83 and extend beyond the two side plates 82. An operating part 86 is fixed to the end of each bent portion 85 extending beyond the two side plates 82. Each channel 83 has multiple elastic retaining plates 87 fixed to its two opposite sidewalls at intervals, with slots 871 formed between adjacent elastic retaining plates 87. A retaining part 851, which can be selectively engaged within the corresponding slot 871, is fixed to the bent portion 85. Flexible pallet The side plate 87 is inclined inwards towards the side plate 82, so that the holding part 851 can be engaged into the corresponding slot 871 when it moves inwards. Pulling the operating part 86 outwards allows the holding part 851 to slide into the outer slot 871, which increases the distance between the two arc-shaped elastic metal pieces 84, allowing the transparent plastic ruler 1 to be removed without friction and avoiding damage to the transparent plastic ruler 1. Pushing the operating part 86 inwards allows the holding part 851 to slide into the inner slot 871, which decreases the distance between the two arc-shaped elastic metal pieces 84, thus clamping and fixing the transparent plastic ruler 1.

[0049] In other embodiments, the support device 2 may not include the fastener 4, connector 5, folding connector 6, universal connection structure 7, and clamping member 8.

[0050] The present invention has been described above in conjunction with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations made in accordance with the essence of the present invention.

Claims

1. An image precision evaluation scale for radiology, characterized by comprising: include: A transparent plastic ruler with an accuracy of 0.5-1cm that can be used for both lying and standing imaging. The surface of the transparent plastic ruler has graduated grooves and digital grooves that are spaced apart along the length of the transparent plastic ruler. Each graduated groove and each digital groove is filled with a metal material that can absorb X-rays. Two height-adjustable support devices are supported below both ends of a transparent plastic ruler used in conjunction with lying imaging, so that the transparent plastic ruler is tilted laterally according to the characteristics of the patient's legs. as well as A vertical clamping device is provided, which clamps and fixes a transparent plastic ruler used for standing imaging so that the transparent plastic ruler is in a vertical position.

2. The image precision evaluation scale for radiology according to claim 1, wherein: The transparent plastic ruler includes an imaging layer and reinforcing layers on both sides of the imaging layer. Both the imaging layer and the reinforcing layer are made of transparent acrylic material, and the scale grooves and number grooves are distributed on one side of the imaging layer.

3. The image precision evaluation scale for radiotherapy according to claim 2, wherein: Each of the two support devices includes an upper plate, a lower plate, two upper scissor lifting arms, two lower scissor lifting arms, two horizontal connecting rods, and a horizontal drive rod. One upper end of each of the two upper scissor lifting arms is hinged to the upper plate, and the other upper end of each upper scissor lifting arm is slidably limited within an upper groove on the upper plate. One lower end of each of the two lower scissor lifting arms is hinged to the lower plate, and the other lower end of each lower scissor lifting arm is slidably limited within a lower groove on the lower plate. The two horizontal connecting rods are located between the two upper scissor lifting arms and simultaneously between the two lower scissor lifting arms. Each horizontal connecting rod has its ends connected to a lower end of one upper scissor lifting arm and an upper end of one lower scissor lifting arm, respectively. The horizontal drive rod vertically passes through the two horizontal connecting rods and is threadedly connected to them. Anti-slip elastic pads are fixed to the top surface of each upper plate, and the height of the anti-slip elastic pads on the two support devices is different. The metal material is tin, lead, or iron.

4. The image precision evaluation scale for radiotherapy according to claim 3, wherein: Each of the aforementioned anti-slip elastic pads has a toothed anti-slip texture distributed on its surface.

5. The radio image accuracy evaluation scale as claimed in claim 3, wherein: L-shaped plates are fixed on both sides of the bottom surface of the upper plate. The L-shaped plates on both sides of the bottom surface of the upper plate are arranged in opposite directions. One upper end of the two upper scissor lifting arms is hinged to the vertical part of the corresponding L-shaped plate. The other upper end of the two upper scissor lifting arms is slidably limited in the upper sliding groove on the vertical part of the corresponding L-shaped plate. A fixing member is fixed on the outer side of the vertical part of the L-shaped plate. The fixing member is rotatably connected to a connecting member. The connecting member is connected to a universal connection structure through a folding connecting member. The universal connection structure is connected to a clamping member. The inner wall of the clamping member is also provided with an elastic soft pad. The clamping member is located on one side of the anti-slip elastic soft pad on the top surface of the upper plate along the lying direction of the transparent plastic ruler.

6. The radio image precision evaluation scale as claimed in claim 5, wherein: The fastener includes a main body and a fixing arm extending vertically from one side of the main body. The upper and lower fixing arms are respectively fixed to the vertical part of the L-shaped plate on the upper and lower sides of the upper slide groove. The main body is rotatably connected to the connector. The other opposite side of the main body is a convex arc surface, and the connector has a concave arc surface that matches the convex arc surface.

7. The radio image precision evaluation scale as claimed in claim 6, wherein: The folding connector includes two folding plates. The connector is rotatably connected to one end of one folding plate, and the other end of the folding plate is rotatably connected to one end of the other folding plate. The universal connection structure is fixedly connected to the other folding plate. The universal connection structure includes a first connecting post, a second connecting post, and a universal ball joint. The two ends of the first connecting post are fixedly connected to the universal ball joint and the other folding plate, respectively. The universal ball joint is limited within one end of the second connecting post, and the other end of the second connecting post is fixedly connected to the clamping member.

8. The image precision evaluation scale for radiotherapy according to claim 7, wherein: The clamping component includes a base plate and two side plates connecting opposite sides of the base plate. Corresponding holes are opened on the two side plates. There are two arc-shaped elastic metal sheets between the two side plates. The elastic pads are provided on the opposite surfaces of the two arc-shaped elastic metal sheets and the top surface of the base plate. One end of the two arc-shaped elastic metal sheets is fixed to one end of the inner surface of the two side plates respectively. The other end of the two arc-shaped elastic metal sheets is bent in the opposite direction and extends into a bent portion. The two bent portions pass through the corresponding holes and extend out of the two side plates respectively. An operating part is fixed at the end of the two bent portions extending out of the two side plates. Multiple elastic locking plates are fixed on the two opposite side walls of each hole at intervals. A locking groove is formed between adjacent elastic locking plates. A locking part that can be selectively locked in the corresponding locking groove is fixed on the bent portion.

9. The image precision evaluation scale for radiotherapy according to claim 8, wherein: Each of the aforementioned elastic plates is inclined toward the outside of the side plate.

10. The image precision evaluation scale for radiotherapy according to claim 4, wherein: The vertical clamping device includes two L-shaped clamps arranged in opposite directions, forming a clamping groove between the vertical parts of the two L-shaped clamps. The lower end of a vertically positioned transparent plastic ruler is inserted into the clamping groove. Each L-shaped clamp has horizontally spaced openings on its vertical part. The openings on the vertical parts of the two L-shaped clamps correspond one-to-one, and bolts are inserted through two sets of corresponding openings. Each bolt is screwed with a locking nut.

Images