A method for correcting the magnification of a DR image

Abstract

The application relates to a standing frame and a method for correcting the magnification of a DR image. The standing frame for correcting the magnification of a DR image comprises a base assembly, a standard part, a power assembly and a position sensing part. The base assembly is used for bearing a to-be-measured body. The position sensing part is arranged on the base and is used for determining the position of the to-be-measured body. The standard part is connected to the power assembly. The standard part can move to the position of the to-be-measured body under the drive of the power assembly to replace the to-be-measured body. When the standard part is at the position of the to-be-measured body, the calibration direction of the standard part is consistent with the to-be-measured direction of the to-be-measured body. The length of the standard part along the calibration direction is known. The standing frame in the application makes the standard part and the to-be-measured body be located at the same position, avoids the position error, ensures that the distance from the standard part to a detector is equal to the distance from the to-be-measured body to the detector, and then the DR image of the standard part is used to accurately correct the magnification of the to-be-measured body, reduces the correction deviation and ensures the correction effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical appliances, in particular to a method for correcting magnification of a DR image. BACKGROUND

[0002] In the existing direct digital X-ray photography (Digital Radiography) system, referred to as DR system, when an image of a spine or the like requiring fine measurement of length information is taken, a measured object and a scale are simultaneously located on a standing frame, the scale is placed at a position consistent with a measured position of the measured object, after the image is taken, the magnification of the image is corrected by using the scale graduation. In actual operation, the scale is often located between the measured object and a detector, the distance from the scale to the detector is not equal to the distance from the measured object to the detector, so that the correction of the magnification of the DR image is not accurate, and therefore the method is not applicable to accurate measurement of the spine or lower limb long bone. SUMMARY

[0003] Therefore, it is necessary to provide a method for correcting magnification of a DR image, which can improve correction accuracy.

[0004] The method for correcting magnification of a DR image is used in a system for correcting magnification of a DR image, the system for correcting magnification of a DR image comprises a ray source, a detector and a standing frame, the standing frame is located between the ray source and the detector, and the method for correcting magnification of a DR image comprises the following steps:

[0005] A first DR image of a measured object standing on a base assembly is acquired, and a position of the measured object on the base assembly is determined;

[0006] According to the determined position of the measured object, a power assembly is controlled to drive a standard part to move to the position of the measured object;

[0007] A second DR image of the standard part at the position of the measured object is acquired;

[0008] A magnification is determined according to the second DR image, and the magnification of the first DR image is corrected according to the determined magnification;

[0009] The standing frame comprises a base assembly, a standard part, a power assembly and a position sensing part; the base assembly is used for carrying the measured object; the position sensing part is arranged on the base assembly and is used for determining the position of the measured object; the standard part is connected to the power assembly, and the standard part can move to the position of the measured object to replace the measured object under the driving of the power assembly, and when the standard part is at the position of the measured object, a calibration direction of the standard part is consistent with a measurement direction of the measured object, wherein a part length of the standard part along the calibration direction is known.

[0010] The beneficial effects of the present application are as follows:

[0011] Compared with the prior art, the position sensing part is arranged on the standing frame to sense the to-be-measured body and accurately position the to-be-measured body when the to-be-measured body is located on the base assembly, and after the to-be-measured body leaves, the power assembly is controlled to drive the standard part to reach the position, that is, the standard part directly and accurately replaces the to-be-measured body, so that the standard part is located at the same position as the to-be-measured body, the position error is avoided, the distance from the standard part to the detector is equal to the distance from the to-be-measured body to the detector, and then the DR image of the standard part is used to accurately correct the magnification of the to-be-measured body, reduce the correction deviation, ensure the correction effect, and be more beneficial to accurate measurement of the spine or lower limb long bone of the to-be-measured body.

[0012] In one of the embodiments, the power assembly comprises a support arranged on the base assembly and capable of moving along a first direction relative to the base assembly, and the standard part is arranged on the support and moves along the first direction with the support and is capable of moving along a second direction relative to the support, and through the movement along the first direction and the movement along the second direction, the standard part can reach the position of the to-be-measured body.

[0013] In one of the embodiments, determining the magnification according to the second DR image comprises the following steps: measuring the image distance between two points on the standard part with a known actual distance on the second DR image, and calculating the magnification according to the ratio between the image distance and the actual distance. In the application, the standard part can move in two directions through the support, so that the movement path of the standard part can be planned according to the positioning of the to-be-measured body on the base assembly, and the standard part can reach the positioning of the to-be-measured body on the base assembly through the cooperation of the two-direction movement, which is more beneficial to realize the automatic control of the movement of the standard part.

[0014] In one of the embodiments, the power assembly further comprises a first power unit arranged between the base assembly and the support to drive the support to move along the first direction. The movement of the support driving the standard part in the first direction is realized through the first power unit.

[0015] In one of the embodiments, the base assembly comprises a base, the position sensing part is arranged on the base, the support comprises a first support rod and a second support rod, the first support rod and the second support rod are arranged intersectingly, the standard part is arranged on the first support rod, and the first power unit is arranged between the base and the second support rod. The support in the scheme is an L-shaped support, which is simple in structure, saves materials, and reduces cost.

[0016] In one of the embodiments, the first power unit comprises a first driving member, a first screw rod and a first nut. The first screw rod is arranged on the base and extends along the first direction and rotates under the drive of the first driving member. The first nut is connected to the second support rod away from the first support rod and is sleeved on the first screw rod. The first nut drives the support along the first direction under the rotation of the first screw rod. The first power unit adopts the screw rod and nut cooperation movement mode, so that the movement of the support and the standard part in the first direction is more accurate and stable.

[0017] In one of the embodiments, the base assembly comprises a base and at least two support frames. The position sensing member is arranged on the base. The two support frames are arranged at the two ends of the base and are distributed along the vertical direction of the first direction. The two ends of the support are arranged on the two support frames respectively. The first power unit is arranged between the support and at least one of the support frames. The support is supported at the two ends, so as to improve the stability of the support when moving in the first direction.

[0018] In one of the embodiments, the first power unit comprises a first driving member, a first screw rod and a first nut. The first screw rod is arranged on the base and extends along the first direction and rotates under the drive of the first driving member. The first nut is connected to the second support rod away from the first support rod and is sleeved on the first screw rod. The first nut drives the support along the first direction under the rotation of the first screw rod. The first power unit adopts the screw rod and nut cooperation movement mode, so that the movement of the support and the standard part in the first direction is more accurate and stable.

[0019] In one of the embodiments, the power assembly further comprises a second power unit. The second power unit is arranged between the support and the standard part and is connected to the standard part to drive the standard part to move along the second direction. The second power unit realizes the movement of the support in the second direction.

[0020] In one of the embodiments, the second power unit comprises a second driving member, a second screw rod and a second nut. The second screw rod is arranged on the support and extends along the second direction and rotates under the drive of the second driving member. The second nut is connected to the standard part and is sleeved on the second screw rod. The second nut drives the standard part to move along the second direction under the rotation of the second screw rod. The second power unit adopts the screw rod and nut cooperation mode, so that the movement of the standard part in the second direction is more accurate and stable. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0022] Figure 1 A schematic view of a three-dimensional structure of a standing frame for correcting the magnification of a DR image provided by the present application.

[0023] Figure 2 A schematic view of a local part of a cooperation between a first power unit and a second supporting rod provided by the present application.

[0024] Figure 3 A schematic view of a local part of a cooperation between a second power unit and a measuring scale provided by the present application.

[0025] Figure 4 A schematic view of a local part of a receiving groove on a base provided by the present application.

[0026] Figure 5 A schematic view of a first nut structure provided by the present application.

[0027] Figure 6 A schematic view of a local part of a first supporting rod provided by the present application.

[0028] Figure 7 A schematic view of a local part of a cooperation between a second nut and a measuring scale provided by the present application.

[0029] Figure 8 A schematic view of another three-dimensional structure of a standing frame for correcting the magnification of a DR image provided by the present application.

[0030] Figure 9 A workflow diagram of a standing frame for correcting the magnification of a DR image provided by the present application.

[0031] Reference signs:

[0032] 100, measuring scale; 200, supporting frame; 210, first supporting rod; 211, first receiving cavity; 212, first opening; 220, second supporting rod; 300, first power unit; 310, first driving member; 320, first screw rod; 330, first nut; 331, rectangular sliding groove; 400, second power unit; 410, second driving member; 420, second screw rod; 430, second nut; 500, base; 510, receiving groove; 520, groove opening; 530, anti-disengagement part; 540, rectangular protrusion; 600, supporting frame; 610, supporting rod; 620, connecting rod. DETAILED DESCRIPTION

[0033] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0034] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0036] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0038] The following is a further detailed description of the stand and method for correcting the magnification of DR images of the present invention in conjunction with the accompanying drawings and specific embodiments:

[0039] The stand for correcting the magnification of DR image is used in the system for correcting the magnification of DR image, and the system for correcting the magnification of DR image further comprises a radiation source and a detector, and the stand is located between the radiation source and the detector and is used for measuring and carrying a body to be measured. The stand comprises a base assembly and a standard piece. The base assembly comprises a base 500 used for carrying the body to be measured. The standard piece is preferably a measuring scale 100 with scales. The arrangement direction of the scales of the measuring scale 100 is the calibration direction of the standard piece. In other embodiments, the standard piece can be other objects without scales, but at least part of the length of the object in the calibration direction is known, and the part of the length of the object is marked so as to be recognized on the DR image.

[0040] In the prior art, the body to be measured and the measuring scale 100 are located on the stand at the same time, and the measuring scale 100 is placed at the same position as the body to be measured. After the image is taken, the scales of the measuring scale 100 are used to correct the magnification of the image. However, in actual operation, the measuring scale 100 is often located between the body to be measured and the detector, and the distance from the measuring scale 100 to the detector is not equal to the distance from the body to be measured to the detector, so that the correction of the magnification of the DR image is not accurate.

[0041] In order to solve the above problems, the stand for correcting the magnification of DR image further comprises a power assembly and a position sensing piece according to the application. Figures 1-8 In the embodiment, the stand for correcting the magnification of DR image further comprises a power assembly and a position sensing piece. The position sensing piece is arranged on the base 500 and is used for sensing and positioning the position of the body to be measured. The measuring scale 100 is connected to the power assembly and can move under the drive of the power assembly to reach the position of the body to be measured on the base 500 to replace the body to be measured.

[0042] In the embodiment, the position sensing piece is arranged on the stand to sense and accurately position the body to be measured when the body to be measured is located on the base 500. After the body to be measured leaves, the power assembly is controlled to drive the measuring scale 100 to reach the position and adjust the position of the measuring scale 100, so that the calibration direction of the measuring scale 100 is consistent with the measurement direction of the body to be measured, that is, the arrangement direction of the scales of the measuring scale 100 is consistent with the measurement direction of the body to be measured. That is, the measuring scale 100 directly and accurately replaces the body to be measured, so that the measuring scale 100 and the body to be measured are located at the same position, the position error is avoided, the distance from the measuring scale 100 to the detector is equal to the distance from the body to be measured to the detector, and then the DR image of the measuring scale 100 is used to accurately correct the magnification of the body to be measured, reduce the correction deviation, ensure the correction effect, and be more conducive to the accurate measurement of the spine or long bone of the lower limb of the body to be measured.

[0043] In the present application, the position of the body to be measured is not limited to the position directly contacted by the base 500 when the body to be measured stands on the base 500, but also includes the entire three-dimensional space range occupied by the body to be measured on the standing frame, that is, as long as the projection of the space on the base 500 falls within the range of the position directly contacted by the body to be measured and the base 500.

[0044] The arrival of the measuring scale 100 at the position of the body to be measured means that the measuring scale 100 arrives within the above-mentioned three-dimensional space range of the standing of the body to be measured, and the arrangement direction of the scale markings of the measuring scale 100 is consistent with the measurement direction of the body to be measured. The free end of the measuring scale 100 away from the support 200 can be in contact with the base 500 or suspended above the base 500.

[0045] The body to be measured generally stands on the base 500 and is perpendicular to the base 500. The measurement direction of the body to be measured is generally the standing direction of the body to be measured. In this case, when the measuring scale 100 arrives at the position of the body to be measured, the arrangement direction of the scale markings of the measuring scale 100 is consistent with the standing direction of the body to be measured, that is, the arrangement direction of the scale markings of the measuring scale 100 is perpendicular to the base 500. The arrangement direction of the scale markings of the measuring scale 100 is generally along the length direction of the measuring scale 100, that is, when the measuring scale 100 arrives at the position of the body to be measured, the measuring scale 100 is perpendicular to the base 500.

[0046] If the measurement direction of the body to be measured is not the standing direction of the body to be measured, but other directions at a certain angle with the standing direction of the body to be measured, the placement direction of the measuring scale 100 is adjusted so that when the measuring scale 100 arrives at the position of the body to be measured, the arrangement direction of the scale markings of the measuring scale 100 is consistent with the measurement direction of the body to be measured.

[0047] The placement direction of the measuring scale 100 before it arrives at the position of the body to be measured is not specified, as long as it is consistent with the measurement position of the body to be measured when the measuring scale 100 arrives at the position of the body to be measured.

[0048] At the same time, since the contact range of the body to be measured with the base 500 when the body to be measured stands on the base 500 can be large, in order to ensure the accuracy of the positioning of the position sensing member to the position of the body to be measured, in the present embodiment, the positioning of the position sensing member to the body to be measured is preferably at the center point of the contact range of the body to be measured with the base 500. Of course, in other embodiments, the positioning of the position sensing member to the body to be measured can also be at any other position within the contact range of the body to be measured with the base 500.

[0049] In order to improve the integration of the standing frame, in the present embodiment, the power assembly is preferably arranged on the base assembly. The movement of the power assembly on the base assembly causes the measuring scale 100 to arrive at the position of the body to be measured.

[0050] The power assembly specifically comprises a support 200, a first power unit 300 and a second power unit 400. The support 200 is arranged on the base assembly through the first power unit 300 and can move along a first direction relative to the base assembly under the driving of the first power unit 300. The measuring scale 100 is arranged on the support 200 through the second power unit 400 and moves along the first direction with the support 200, and can move along a second direction relative to the support 200 under the driving of the second power unit 400. Through the movement along the first direction and the movement along the second direction, the measuring scale 100 can reach the position of the object to be measured on the base 500.

[0051] For the convenience of description, in the embodiment, the first direction is set as the Y direction, and the second direction is set as the X direction. Of course, in other embodiments, the first direction and the second direction are not limited to two orthogonal directions, but can be two non-parallel directions, as long as the measuring scale 100 can reach the position of the object to be measured through the movement along the two directions.

[0052] Reference Figure 1 With Figure 2 The first power unit 300 comprises a first driving member 310, a first lead screw 320 and a first nut 330. The first driving member 310 is preferably a motor. The first lead screw 320 is arranged on the base assembly and extends along the Y direction and rotates under the driving of the first driving member 310. The first nut 330 is connected with the support 200 and is sleeved on the first lead screw 320, and moves the support 200 along the Y direction under the rotation of the first lead screw 320, and the support 200 drives the measuring scale 100 to move along the Y direction. The first power unit 300 adopts the cooperation movement mode of the lead screw and the nut, so that the movement of the support 200 and the measuring scale 100 along the Y direction is more accurate and stable.

[0053] Reference Figure 3 The second power unit 400 comprises a second driving member 410, a second lead screw 420 and a second nut 430. The second driving member 410 is preferably a motor. The second lead screw 420 is arranged on the support 200 and extends along the X direction and rotates under the driving of the second driving member 410. The second nut 430 is connected with the measuring scale 100 and is sleeved on the second lead screw 420, and moves the measuring scale 100 along the X direction under the rotation of the second lead screw 420. The second power unit 400 adopts the cooperation movement mode of the lead screw and the nut, so that the movement of the measuring scale 100 along the X direction is more accurate and stable.

[0054] The measuring scale 100 can move along two directions through the support 200, so that the movement path of the measuring scale 100 can be planned according to the positioning of the object to be measured on the base assembly, and the object to be measured on the base assembly is reached through the cooperation of the two direction movements, which is more conducive to the automatic control of the movement of the measuring scale 100.

[0055] With reference to Figure 1 According to one embodiment of the present application, the position sensing member is preferably a pressure sensing member, more preferably a pressure pad (not shown in the figure), which is arranged on the base 500 and can sense and locate the force position of the body standing on the base 500 and determine the gravity center.

[0056] The support 200 comprises a first support rod 210 and a second support rod 220, which are arranged intersecting each other, preferably perpendicularly intersecting each other, and in this case the measuring scale 100 is arranged on the first support rod 210 through the second power unit 400, and the second support rod 220 is arranged on the base 500 through the first power unit 300. The support 200 in this embodiment is an L-shaped support 200, which is simple in structure, saves materials and reduces costs.

[0057] In this case, the specific cooperation mode of the second support rod 220 and the base 500 is that the first lead screw 320 is arranged on the base 500 and extends along the Y direction and rotates under the drive of the first driving member 310; the first nut 330 is connected with the end of the second support rod 220 away from the first support rod 210 and is sleeved on the first lead screw 320, and under the rotation of the first lead screw 320, the first nut 330 drives the support 200 to move along the Y direction.

[0058] In order to realize the installation of the first power unit 300 on the base 500, as shown in Figure 4 The base 500 is provided with a containing groove 510, the first lead screw 320 and the first nut 330 are contained in the containing groove 510, and the first lead screw 320 can rotate in the containing groove 510 and the first nut 330 can move in the containing groove 510. The slot opening 520 of the containing groove 510 extends along the Y direction, the end of the second support rod 220 away from the first support rod 210 is connected with the first nut 330 through the slot opening 520 of the containing groove 510, and when the first lead screw 320 in the containing groove 510 rotates under the drive of the first driving member 310, the first nut 330 drives the support 200 and the measuring scale 100 to move along the extension direction of the slot opening 520 of the containing groove 510, that is, along the Y direction.

[0059] In order to limit the first nut 330 circumferentially and prevent it from rotating with the first lead screw 320, the containing groove 510 in this embodiment is preferably a rectangular groove, and the first nut 330 is also preferably a four-prism nut.

[0060] The second supporting rod 220 can be provided separately from the first nut 330 or integrally with the first nut 330. When the second supporting rod 220 is provided separately from the first nut 330, the end of the second supporting rod 220 away from the first supporting rod 210 can be inserted into the accommodating groove 510 through the slot 520 of the accommodating groove 510 and connected with the first nut 330. Alternatively, the first nut 330 can be provided with a connecting portion on the side facing the slot 520 of the accommodating groove 510, and the connecting portion can be connected with the end of the second supporting rod 220 away from the first supporting rod 210.

[0061] To prevent the first nut 330 from being pulled out of the accommodating groove 510, the accommodating groove 510 comprises a pull-out prevention portion 530 for stopping the first nut 330. To further improve the pull-out prevention effect and improve the stability of the bracket 200 during movement, the pull-out prevention portion 530 preferably comprises two strip-shaped pull-out prevention plates extending along the Y direction, and a gap is provided between the two strip-shaped pull-out prevention plates. The gap forms the slot 520 of the accommodating groove 510, and the bracket 200 is located in the slot 520 of the accommodating groove 510. The width of the slot 520 of the accommodating groove 510 is slightly larger than the outer diameter of the second supporting rod 220, so that the movement of the bracket 200 can be limited and guided by the two strip-shaped pull-out prevention plates while ensuring the normal movement of the second supporting rod 220 in the slot 520 of the accommodating groove 510. At the same time, the strip-shaped pull-out prevention plates can also shield part of the accommodating groove 510 to reduce the entry of external dust and other impurities into the accommodating groove 510 and affect the normal use of the first power unit 300.

[0062] To further guide and limit the movement of the first nut 330, a guide structure is provided between the groove wall of the accommodating groove 510 and the first nut 330. The groove wall of the accommodating groove 510 is provided with a guide portion, which is preferably a rectangular protrusion 540, and the first nut 330 is provided with a cooperating portion, which is preferably a rectangular sliding groove 331. The rectangular protrusion 540 is inserted into the rectangular sliding groove 331 and can slide in the sliding groove to guide and limit the movement of the first nut 330.

[0063] Of course, in other embodiments, the guide portion can be provided on the first nut 330, and the cooperating portion can be provided on the groove wall of the accommodating groove 510.

[0064] To achieve the installation of the second power unit 400 on the bracket 200, the bracket 200 is provided with a second accommodating groove 510. Figure 6 and Figure 7As shown, the first supporting rod 210 is provided with a first accommodating cavity 211, the second screw rod 420 and the second nut 430 are accommodated in the first accommodating cavity 211, the first accommodating cavity 211 is provided with a first opening 212 facing the side of the measuring scale 100, the first opening 212 extends along the X direction, and the measuring scale 100 is connected with the second nut 430 through the first opening 212. When the second screw rod 420 in the first accommodating cavity 211 is driven to rotate by the second driving member 410, the second nut 430 drives the measuring scale 100 to move along the extension direction of the first opening 212, so as to realize the movement of the measuring scale 100 along the X direction, and the two sides of the first opening 212 limit and guide the movement of the measuring scale 100 and the second nut 430.

[0065] The measuring scale 100 and the second nut 430 can be arranged in a separate manner or in an integrated manner. When arranged in a separate manner, the measuring scale 100 can be inserted into the first accommodating cavity 211 and connected with the second nut 430 after passing through the first opening 212, or the second nut 430 can be provided with a connecting portion on the side facing the first opening 212, and the connecting portion passes out of the first opening 212 and is connected with the measuring scale 100.

[0066] Reference Figure 8 According to one embodiment of the present application, the base assembly further comprises at least two supporting frames 600. For the convenience of description, two supporting frames 600 are described below. The pressure pad is arranged on the base 500, and the at least two supporting frames 600 are arranged at the two ends of the base 500 and are distributed along the vertical direction of the Y direction. The two ends of the support 200 are arranged on the two end supporting frames 600, and the support 200 is in a single beam structure at this time. The first power unit 300 is arranged between the support 200 and the at least one end supporting frame 600. When the first power unit 300 is arranged between the support 200 and the end supporting frame 600, the other end of the support 200 is also connected to the other end supporting frame 600 and can move on the other end supporting frame 600. The two ends of the support 200 are supported to improve the stability of the support 200 when moving in the Y direction. Preferably, the first power unit 300 is arranged between the support 200 and the two end supporting frames 600.

[0067] In order to further improve the support stability of the supporting frame 600, the supporting frame 600 is preferably a U-shaped supporting frame. The U-shaped supporting frame comprises two supporting rods 610 fixed on the base 500 and a connecting rod 620 arranged between the two supporting rods 610.

[0068] When the first power units 300 are arranged between the support 200 and the end support frames 600, the specific cooperation structure of the support 200 and the end support frames 600 is that the first lead screws 320 are arranged on the connecting rods 620 at the two ends respectively, each first lead screw 320 extends along the Y direction, and meanwhile, the first nuts 330 are arranged at the two ends of the support 200 respectively, the first nuts 330 at the two ends are sleeved on the first lead screws 320 at the two ends respectively, and when the measuring scale 100 needs to move along the Y direction, the first driving members 310 are started to drive the first lead screws 320 at the two ends to rotate synchronously, so as to drive the first nuts 330 at the two ends to move synchronously along the Y direction.

[0069] Two first driving members 310 can be arranged on the standing frame, and the two first driving members 310 are arranged on the end support frames 600 respectively to drive the first lead screws 320 at the two ends to rotate respectively; or only one first driving member 310 is arranged, and the first driving member 310 drives the first lead screws 320 at the two ends to rotate simultaneously through a transmission mechanism.

[0070] In order to realize the installation of the first power unit 300 on the connecting rod 620, the second accommodating cavity is arranged on the connecting rod 620, the first lead screw 320 and the first nut 330 are accommodated in the second accommodating cavity, the first lead screw 320 can rotate in the second accommodating cavity, and the first nut 330 can move in the second accommodating cavity. A second opening is arranged on the side of the second accommodating cavity facing the support 200, the second opening extends along the Y direction, the support 200 and the first nut 330 are connected through the second opening and can move along the extension direction of the second opening, and the two sides of the second opening limit and guide the movement of the support 200. Since the connecting rod 620 is generally a round rod, the second accommodating cavity in the embodiment is preferably a cylindrical hollow cavity, and the first nut 330 is correspondingly preferably a cylindrical nut. The structure of the second accommodating cavity and the second opening is similar to that of the first accommodating cavity 211 and the first opening 212, which is not shown in the drawings. The connection structure and cooperation mode of the measuring scale 100 and the support 200 in the embodiment are similar to those of the measuring scale 100 and the first support rod 210 in the above-mentioned embodiment, which will not be described here.

[0071] The support 200 and the first nut 330 can be arranged in two parts or in one part, when arranged in two parts, the end of the support 200 can be inserted into the second accommodating cavity and connected with the first nut 330 after passing through the second opening, or the first nut 330 can be provided with a connecting part on the side facing the second opening, and the connecting part passes out of the second opening and is connected with the support.

[0072] Referring to Figure 9 The specific steps of correcting the DR image magnification multiple by using the standing frame in the application are as follows:

[0073] Step S10: Obtain a first DR image of the subject standing on the base 500, and locate the position (X0, Y0) of the subject on the base 500;

[0074] Step S20: According to the located position of the subject, control the power assembly to drive the measuring ruler 100 to move to the position (X0, Y0) of the subject;

[0075] Step S30: Obtain a second DR image of the measuring ruler 100 at the position of the subject;

[0076] Step S40: Determine the magnification according to the second DR image, and correct the magnification of the first DR image according to the determined magnification.

[0077] The magnification refers to the ratio of the size of the object on the DR image to the actual size of the object, wherein the size of the object on the DR image = DR image pixel size * number of DR pixels occupied by the object, which can be directly measured on the DR image and is a basic attribute of the DR image. In the present application, the image distance between two points on the measuring ruler with a known actual distance can be measured through the second DR image of the measuring ruler, and the magnification can be calculated from the ratio between the image distance and the actual distance. Thus, for the subject to be measured, the actual distance of the subject can be obtained through the magnification and the image distance of the subject on the first DR image.

[0078] In step S20, according to the located position of the subject, the power assembly is controlled to drive the measuring ruler 100 to move to the position of the subject, which adopts the following steps:

[0079] Step S21a: First, control the first power unit 300 to drive the support 200 and the measuring ruler 100 to move to a transition position (0, Y0) along the Y direction;

[0080] Step S22a: Then, control the second power unit 400 to drive the measuring ruler 100 to move to the position (X0, Y0) of the subject along the X direction.

[0081] In the present application, the driving nut in the power unit has position information, and the design principle of the power assembly is to Figure 1For example, in the first power unit, the first nut 330 is aligned with the 0 coordinate point of the Y axis on the pressure pad at the zero position of the first lead screw 320; in the second power unit, the second nut 430 is aligned with the 0 coordinate point of the X axis on the pressure pad at the zero position of the second lead screw 420. After the position (X0, Y0) of the measured body on the pressure pad is determined, the first driving member 310 drives the first nut 330 to move on the first lead screw 320 by a distance Y0, and then the second driving member 410 drives the second nut 430 to move on the second lead screw 420 by a distance X0. According to the basic properties of the driving member, the lead screw and the nut, it can be determined that the driving member rotates one circle, and the nut moves on the lead screw by a distance. Therefore, after returning to the zero point each time, the control software can send instructions to make the nut move to any distance from the zero point, and the distance of the current nut from the zero point can also be obtained.

[0082] Of course, in other embodiments, the step S20 of controlling the power assembly to drive the measuring ruler 100 to move to the position of the measured body according to the positioned position of the measured body can also adopt the following steps:

[0083] Step S21b: first control the second power unit 400 to drive the measuring ruler 100 to move to the transition position (X0, 0) along the X direction;

[0084] Step S22b: then control the first power unit 300 to drive the support 200 and the measuring ruler 100 to move to the position (X0, Y0) of the measured body along the Y direction.

[0085] Of course, in other embodiments, the step S20 of controlling the power assembly to drive the measuring ruler 100 to move to the position of the measured body according to the positioned position of the measured body can also adopt the following steps:

[0086] Step S21c: control the measuring ruler 100 to move to the position of the measured body along the Y direction and the X direction at the same time. That is, when the first power unit drives the measuring ruler 100 to move along the Y direction, the second power unit 400 also drives the measuring ruler 100 to move along the X direction, so that the measuring ruler 100 moves along the two directions at the same time to reach the position (X0, Y0) of the measured body.

[0087] When the DR image magnification is corrected by the standing frame of the present application, the measuring ruler 100 and the measured body are located at the same position, avoiding position errors, so as to ensure that the distance from the measuring ruler 100 to the detector is equal to the distance from the measured body to the detector, and then the DR image magnification of the measured body is accurately corrected by using the DR image of the measuring ruler 100, reducing the correction deviation, ensuring the correction effect, and being more beneficial to the accurate measurement of the spine or lower limb long bone of the measured body.

[0088] Of course, in other embodiments, the first power unit 300 and the second power unit 400 are not limited to the above-mentioned screw and nut matching mode, and can be other driving structures, such as a linear driver, as long as the accurate movement of the support 200 and the measuring scale 100 in the first direction and the second direction can be controlled. If the first power unit 300 uses a linear driver, the telescopic rod of the linear driver is fixedly connected with the support 200, and the telescopic rod is used to control the movement of the support 200 in the first direction.

[0089] Of course, in other embodiments, the power assembly can also be arranged outside the base assembly, i.e., the first power unit 300 is arranged outside the base assembly to control the movement of the support 200 in the first direction.

[0090] In the embodiment, the driving of the standard parts by the power assembly is preferably motor driving. Of course, in other embodiments, the driving of the standard parts by the power assembly can also be electrode driving, internal combustion engine driving, hydraulic driving, pneumatic driving, or even manual driving and other driving modes.

[0091] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0092] The above-mentioned embodiments only express several implementation manners of the application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the application, and these all belong to the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A method for correcting DR image magnification, used in a system for correcting DR image magnification, wherein the system comprises a radiation source, a detector, and a stand, wherein the stand is located between the radiation source and the detector, and wherein: The method for correcting the DR image magnification comprises the following steps: Acquire a first DR image of the object to be measured standing on the base assembly, and determine the position of the object to be measured on the base assembly; According to the determined position of the object to be measured, the power assembly is controlled to drive the standard component to move to the position of the object to be measured; Acquire a second DR image of the standard part at the position of the object to be measured; determining a magnification based on the second DR image, and correcting the magnification of the first DR image based on the determined magnification; Among them, the standing frame includes a base assembly, a standard part, a power assembly and a position sensing part; the base assembly is used to carry the object to be measured; the position sensing part is arranged on the base assembly and is used to determine the position of the object to be measured; the standard part is connected to the power assembly, and the standard part is driven by the power assembly to move to the position of the object to be measured to replace the object to be measured, and when at the position of the object to be measured, the calibration direction of the standard part is consistent with the measurement direction of the object to be measured, wherein the partial length of the standard part along the calibration direction is known.

2. The method for correcting DR image magnification according to claim 1, characterized in that: Determining the magnification based on the second DR image comprises the following steps: The image distance between two points on the standard part whose actual distance is known is measured on the second DR image, and the magnification is calculated from the ratio between the image distance and the actual distance.

3. The method for correcting DR image magnification according to claim 1, wherein: The power assembly includes a bracket, which is arranged on the base assembly and can move along a first direction relative to the base assembly. The standard component is arranged on the bracket and can move along a second direction relative to the bracket.

4. The method for correcting DR image magnification according to claim 3, wherein: The power assembly further includes a first power unit, which is disposed between the base assembly and the bracket to drive the bracket to move along the first direction.

5. The method for correcting DR image magnification according to claim 4, characterized in that: The base assembly includes a base, the position sensing component is arranged on the base, the bracket includes a first support rod and a second support rod, the first support rod and the second support rod are arranged to intersect, the standard component is arranged on the first support rod, and the first power unit is arranged between the base and the second support rod.

6. The method for correcting DR image magnification according to claim 5, characterized in that: The first power unit includes a first driving member, a first screw rod and a first nut; the first screw rod is arranged on the base and extends along the first direction, and can be rotated under the drive of the first driving member; the first nut is connected to the end of the second support rod away from the first support rod, and is sleeved on the first screw rod, and as the first screw rod rotates, the first nut drives the bracket to move along the first direction.

7. The method for correcting DR image magnification according to claim 4, characterized in that: The base assembly includes a base and at least two support frames, the position sensing component is arranged on the base, and at least two support frames are respectively arranged at both ends of the base and distributed along the vertical direction of the first direction. The two ends of the bracket are respectively arranged on the support frames at both ends, and the first power unit is arranged between the bracket and at least one end of the support frame.

8. The method for correcting DR image magnification according to claim 7, characterized in that: The first power unit includes a first driving member, a first screw rod and a first nut; there are two first screw rods, which are respectively arranged on the support frames at both ends and extend along the first direction; there are two first nuts, which are respectively arranged at both ends of the bracket and are respectively sleeved on the two first screw rods; the two first screw rods rotate synchronously to drive the two first nuts to move synchronously along the first direction.

9. The method for correcting DR image magnification according to claim 3, wherein: The power assembly further includes a second power unit, which is disposed between the bracket and the standard component and connected to the standard component to drive the standard component to move along the second direction.

10. The method for correcting DR image magnification according to claim 9, characterized in that: The second power unit includes a second driving member, a second screw rod and a second nut. The second screw rod is arranged on the bracket and extends along the second direction and can rotate under the drive of the second driving member; the second nut is connected to the standard member and is sleeved on the second screw rod. As the second screw rod rotates, the second nut drives the standard member to move along the second direction.

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