X-ray beam limiting device and X-ray imaging system

Abstract

The invention discloses an X-ray beam limiting device and an X-ray imaging system.The X-ray beam limiting device comprises a shell, a first motor, a second motor, a first ray shielding assembly, a second ray shielding assembly and a ray shielding sleeve, and the first ray shielding assembly, the second ray shielding assembly and the ray shielding sleeve are sequentially arranged in the X-ray emitting direction; the first ray shielding assembly and the second ray shielding assembly can adjust an irradiation field under the action of the first motor and the second motor, and the ray shielding sleeve can block X-ray scattering; the X-ray beam limiting device can prevent the edge of an irradiation field from being blurred, and can also prevent scattered X-rays from influencing other areas of a human body except for irradiation; and doctors and nurses in close-range operation can be effectively protected.

Description

Technical Field

[0001] The present invention relates to the technical field of X-ray beam limiters, and in particular to an X-ray beam limiter and an X-ray imaging system. Background Art

[0002] X-ray diagnostic technology is the earliest non-invasive visceral examination technology used in the world. When X-rays pass through the human body, different parts absorb them to different degrees. For example, bones absorb more X-rays than muscles. Therefore, the amount of X-rays in different parts of the human body is different. These different amounts of X-rays carry the density distribution information of various parts of the human body. The strength of the photosensitivity at the front end of the detector is quite different, so the detector can collect shadows or grayscales of different densities. According to the contrast of shadow thickness or grayscale, combined with clinical manifestations, test results and pathological diagnosis, it can be judged whether a part of the human body is normal. With the continuous improvement of medical diagnosis level and people's increasing attention to health, the application of X-ray diagnostic technology is becoming more and more extensive.

[0003] The X-ray generator is a basic component of X-ray diagnostic equipment, which usually includes a tube and an X-ray beam limiter. The X-ray beam limiter is usually installed under the tube, and the tube emits X-rays, which are projected onto the subject through the lead leaf opening inside the X-ray beam limiter. X-rays are harmful to the human body, and the projection range of X-rays needs to be controlled so that they only irradiate the parts of the human body that need to be examined or the lesions, to avoid the harm of excess X-rays to the human body, and the X-ray beam limiter plays this role.

[0004] The lead leaf opening of the X-ray beam limiter is generally controlled by a pair of movable shielding plates, which are generally moved by a motor drive. When determining the irradiation field of the X-ray, the irradiation field can be simulated by the light field lamp and the reflector in the beam limiter, and then the position of the shielding plates can be adjusted to obtain the desired irradiation field. However, the driving mechanism of the shielding plates in the existing X-ray beam limiter is relatively complex, and because the shielding plates are relatively thin, the X-rays will form scattered rays at the edges that are inclined relative to the X-ray optical axis after passing through the shielding plates, which will cause the edges of the irradiation field to be blurred, and the scattered X-rays will affect other areas of the human body except for irradiation. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects or problems existing in the background technology, and to provide an X-ray beam limiter and an X-ray imaging system, which can avoid blurring of the edge of the irradiation field, and can also avoid the scattered X-rays from affecting other areas of the human body except for the irradiation; and effectively protect doctors and nurses performing close-range surgery.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] 1. An X-ray beam limiter, comprising: a shell; a first motor, which is fixedly connected to the shell and has a first output end; a second motor, which is fixedly connected to the shell and has a second output end; a first wire-shielding assembly, which comprises a first wire-shielding plate and a second wire-shielding plate arranged in pairs, both of which are slidably matched with the shell in a first direction perpendicular to the X-ray optical axis, and are provided with a first tooth portion and a second tooth portion with tooth tops facing each other; the first tooth portion and the second tooth portion are simultaneously meshed with the first output end so that the first wire-shielding plate and the second wire-shielding plate move toward or away from each other under the drive of the first motor; a first exit space for X-rays to pass through is formed between the first wire-shielding plate and the second wire-shielding plate; a second wire-shielding assembly, which comprises a third wire-shielding plate and a fourth wire-shielding plate arranged in pairs, both of which are slidably matched with the shell in a second direction perpendicular to the X-ray optical axis, and are provided with a third tooth portion and a fourth tooth portion with tooth tops facing each other; the third tooth portion and the fourth tooth portion are simultaneously meshed with the first output end so that the first wire-shielding plate and the second wire-shielding plate move toward or away from each other under the drive of the first motor; a first exit space for X-rays to pass through is formed between the first wire-shielding plate and the second wire-shielding plate; when meshed with the second output end so that the third wire shielding plate and the fourth wire shielding plate move toward or away from each other under the drive of the second motor; a second exit space for X-rays to pass through is formed between the third wire shielding plate and the fourth wire shielding plate; a wire shielding sleeve, which extends along the X-ray optical axis direction and is provided with openings at both ends, and its inner edge surface is a rotation surface formed around the X-ray optical axis; the openings at both ends of the wire shielding sleeve and its inner edge surface define a third exit space for X-rays to pass through, and the length of the third exit space in the direction of the X-ray optical axis is 2.5 times to 3.5 times the distance between the opening of the wire shielding sleeve on the side of the second wire shielding assembly and the X-ray exit focus; the first wire shielding assembly, the second wire shielding assembly and the wire shielding sleeve are arranged in sequence along the X-ray exit direction, and the opening of the third exit space on the side of the second wire shielding assembly covers the second exit space on the projection surface perpendicular to the X-ray optical axis direction.

[0008] Furthermore, the axial direction of the first output end is parallel to the X-ray optical axis and the outer circumferential surface thereof is provided with a first motor tooth portion along the circumferential direction; the first wire shielding plate is provided with a first wire shielding portion extending along the second direction and a first connecting portion extending from the first wire shielding portion and pointing to one end of the first direction, and the second wire shielding plate is provided with a second wire shielding portion extending along the second direction and a second connecting portion extending from the second wire shielding portion and pointing to the other end of the first direction; the first wire shielding portion and the second wire shielding portion are suitable for forming the first exit space; the first connecting portion and the second connecting portion are arranged in the second direction and are respectively provided with the first tooth portion and the second tooth portion; the first output end is located between the first connecting portion and the second connecting portion to engage with the first tooth portion and the second tooth portion at the same time.

[0009] Furthermore, the axial direction of the second output end is parallel to the X-ray optical axis and the outer circumferential surface thereof is provided with a second motor tooth portion along the circumferential direction; the third wire shielding plate is provided with a third wire shielding portion extending along the first direction and a third connecting portion extending from the third wire shielding portion and pointing to one end of the second direction, and the fourth wire shielding plate is provided with a fourth wire shielding portion extending along the first direction and a fourth connecting portion extending from the fourth wire shielding portion and pointing to the other end of the second direction; the third wire shielding portion and the fourth wire shielding portion are suitable for forming the second exit space; the third connecting portion and the fourth connecting portion are arranged in the first direction and are respectively provided with the third tooth portion and the fourth tooth portion; the second output end is located between the third connecting portion and the fourth connecting portion so as to engage with the third tooth portion and the fourth tooth portion at the same time.

[0010] Furthermore, the first wire shielding assembly also includes a first sliding shaft, a second sliding shaft and a third sliding shaft fixed to the shell and arranged along the second direction and extending along the first direction; the first wire shielding plate and the second wire shielding plate are simultaneously slidably mounted on the first sliding shaft at one end away from the first connecting part and the second connecting part; the first wire shielding plate is slidably mounted on the second sliding shaft at one end away from the first sliding shaft; and the second wire shielding plate is slidably mounted on the third sliding shaft at one end away from the first sliding shaft.

[0011] Furthermore, the second wire shielding assembly also includes a fourth sliding shaft, a fifth sliding shaft and a sixth sliding shaft fixed to the shell, arranged along the first direction and extending along the second direction; the third wire shielding plate and the fourth wire shielding plate are both slidably mounted on the fourth sliding shaft at one end away from the third connecting part and the fourth connecting part; the third wire shielding plate is slidably mounted on the fifth sliding shaft at one end away from the fourth sliding shaft; and the fourth wire shielding plate is slidably mounted on the sixth sliding shaft at one end away from the fourth sliding shaft.

[0012] Furthermore, the shell includes a base and an outer shell covered on the base; the first sliding shaft, the second sliding shaft, the third sliding shaft, the fourth sliding shaft, the fifth sliding shaft and the sixth sliding shaft are fixedly connected to the inner wall of the outer shell; and one end of the wire shielding sleeve for emitting X-rays is opened and exposed in the outer shell.

[0013] Furthermore, it also includes a first layer plate, a second layer plate and a third layer plate; the first layer plate is fixed to the shell and is located on the side of the base facing the X-ray emission direction, and is provided with a first through hole extending along the X-ray optical axis direction, and the first wire-shielding assembly is suitable for covering or moving away from the first through hole under the drive of the first motor; the second layer plate is fixed to the shell and is located between the first wire-shielding assembly and the second wire-shielding assembly, and is provided with a second through hole extending along the X-ray optical axis direction, and the second wire-shielding assembly is suitable for covering or moving away from the second through hole under the drive of the second motor; the third layer plate is fixed to the shell and is located between the second wire-shielding assembly and the wire-shielding sleeve, and is provided with a third through hole extending along the X-ray optical axis direction; the wire-shielding sleeve is fixed to the third layer plate at one end close to the third through hole, and the size of the opening at one end close to the third through hole is not less than the size of the third through hole.

[0014] Furthermore, the inner edge surface of the wire shielding sleeve is a cylindrical surface or a conical surface. When it is a conical surface, the diameter of the inner edge surface gradually increases along the X-ray emission direction.

[0015] In addition, the present invention provides another X-ray beam limiter, which includes: a shell; a wire shielding sleeve, which extends along the X-ray optical axis and is provided with openings at both ends, and its inner edge surface is a rotation surface formed around the X-ray optical axis; the openings at both ends of the wire shielding sleeve and its inner edge surface define a third exit space for X-rays to pass through, and the length of the third exit space in the direction of the X-ray optical axis is 2.5 times to 3.5 times the distance between the opening of the wire shielding sleeve on the side of the second wire shielding assembly and the X-ray exit focus; the wire shielding sleeve is slidably installed on the shell along the direction of the X-ray optical axis; and a wire shielding sleeve driving device, which is installed on the shell and is used to drive the wire shielding sleeve to reciprocate within a preset range along the direction of the X-ray optical axis.

[0016] In addition, the present invention also provides an X-ray imaging system, which includes: an X-ray beam limiter as described in any one of the above items; and an X-ray generating device, which is suitable for cooperating with the X-ray beam limiter and used to generate X-rays.

[0017] It can be seen from the above description of the present invention that, compared with the prior art, the present invention has the following beneficial effects:

[0018] An X-ray beam limiter provided by the present invention is provided with a first wire shielding assembly, a second wire shielding assembly and a wire shielding sleeve. When the first motor is in operation, the first wire shielding plate and the second wire shielding plate can be driven to move toward or away from each other at the same time, so as to adjust the size of the first exit space. Similarly, when the second motor is in operation, the third wire shielding plate and the fourth wire shielding plate can be driven to move toward or away from each other, so as to adjust the size of the second exit space. The directions of the X-ray irradiation fields adjusted by the first wire shielding assembly and the second wire shielding assembly are different. The first wire shielding assembly adjusts the irradiation field in the first direction, and the second wire shielding assembly adjusts the irradiation field in the second direction. Through this structure, precise adjustment of the X-ray irradiation field can be achieved, and because the first wire shielding plate and the second wire shielding plate are simultaneously in contact with the first wire shielding plate, the second wire shielding plate can be driven to move toward or away from each other at the same time, so as to adjust the size of the second exit space. The first output end is meshed, and the third wire shielding plate and the fourth wire shielding plate are meshed with the second output end at the same time. Therefore, as long as the motor is running, the paired wire shielding plates will move the same distance at the same speed, so that the position adjustment of the wire shielding plates is more accurate and balanced, and there will be no problem of different adjustment distances of the paired wire shielding plates; and this structure simplifies the number of motors, and only two motors are needed to control the adjustment of the complete irradiation field; and the first wire shielding assembly and the second wire shielding assembly are arranged in sequence along the X-ray emission direction, which can separate the adjustment of the irradiation field in two directions. During control, the first wire shielding assembly and the second wire shielding assembly can be controlled in sequence, or the first wire shielding assembly and the second wire shielding assembly can be controlled at the same time, thereby improving the control efficiency;

[0019] In addition, a wire shielding sleeve is provided, which forms a third exit space. When the X-rays pass through the first wire shielding component and the second wire shielding component, they will enter the wire shielding sleeve and then leave from an opening at one end of the wire shielding sleeve. Since the wire shielding sleeve extends along the X-ray optical axis, it can block the X-rays from scattering outside the wire shielding sleeve when the X-rays are emitted, thereby concentrating the X-rays to a corresponding range, avoiding the scattering of X-rays to affect other areas of the human body except the irradiated area, and effectively protecting doctors and nurses performing close-range surgery.

[0020] Among them, based on the conventional understanding of X-ray beam limiters, each shielding plate and shielding sleeve is made of materials that can block X-rays, such as lead; when X-rays enter the shielding sleeve, except for some X-rays that are suitable for directly leaving the third exit space through an opening at one end of the shielding sleeve, the remaining X-rays will directly hit the inner wall of the shielding sleeve, so multiple reflections will occur in the shielding sleeve, and because the inner wall of the shielding sleeve cannot be infinitely smooth, this kind of reflection is mostly diffuse reflection, which will effectively weaken the energy intensity of the X-rays in the shielding sleeve, even if some X-rays are scattered around at an opening at one end of the shielding sleeve, the intensity of these scattered X-rays is also low and will not affect the human body.

[0021] Among them, the length and aperture size of the wire shielding sleeve are limited. Within the set size range of 2.5 to 3.5 times, the wire shielding sleeve will not affect the irradiation field of the X-rays, while avoiding scattering and escape, thereby effectively protecting doctors and nurses performing close-range surgery.

[0022] Among them, the inner edge surface of the wire shielding sleeve is set as a rotating surface around the X-ray optical axis, which can be a cylindrical surface or a conical surface, both of which can play a role in avoiding X-ray scattering. When it is a conical surface, it should be ensured that its diameter gradually increases along the X-ray emission direction to ensure that the X-ray can form an appropriate irradiation field. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic structural diagram of Embodiment 1 of an X-ray imaging system provided by the present invention;

[0025] Figure 2 A schematic structural diagram of an embodiment of an X-ray beam limiter provided by the present invention;

[0026] Figure 3 A partial structural diagram of an embodiment of an X-ray beam limiter provided by the present invention Figure 1 ;

[0027] Figure 4 A partial structural diagram of an embodiment of an X-ray beam limiter provided by the present invention Figure 2 ;

[0028] Figure 5 A partial structural diagram of an embodiment of an X-ray beam limiter provided by the present invention Figure 3 ;

[0029] Figure 6 A partial structural diagram of an embodiment of an X-ray beam limiter provided by the present invention Figure 4 ;

[0030] Figure 7 A partial structural diagram of an embodiment of an X-ray beam limiter provided by the present invention Figure 5 ;

[0031] Figure 8 A partial structural diagram of an embodiment of an X-ray beam limiter provided by the present invention Figure 6 ;

[0032] Fig. 9 A partial structural diagram of an embodiment of an X-ray beam limiter provided by the present invention Figure 7 ;

[0033] Fig.10 A schematic diagram of the structure of a wire shielding sleeve in an embodiment of an X-ray beam limiter provided by the present invention Figure 1 ;

[0034] Fig.11 A schematic diagram of the structure of a wire shielding sleeve in an embodiment of an X-ray beam limiter provided by the present invention Figure 2 ;

[0035] Fig.12 This is a schematic structural diagram of Example 2 of an X-ray imaging system provided by the present invention.

[0036] Description of main reference numerals:

[0037] Housing 1; first motor 2; first output terminal 3; second motor 4; second output terminal 5; first wire shielding assembly 6; first wire shielding plate 7; second wire shielding plate 8; first tooth portion 9; second tooth portion 10; first exit space 11; second wire shielding assembly 12; third wire shielding plate 13; fourth wire shielding plate 14; third tooth portion 15; fourth tooth portion 16; second exit space 17; wire shielding sleeve 18; first opening 19; second opening 20; third exit space 21; first motor tooth portion 22; first wire shielding portion 23; first connecting portion 24; A second wire shielding portion 25; a second connecting portion 26; a second motor tooth portion 27; a third wire shielding portion 28; a third connecting portion 29; a fourth wire shielding portion 30; a fourth connecting portion 31; a first sliding shaft 32; a second sliding shaft 33; a third sliding shaft 34; a fourth sliding shaft 35; a fifth sliding shaft 36; a sixth sliding shaft 37; a base 38; a housing 39; a first layer plate 40; a second layer plate 41; a third layer plate 42; a first through hole 43; a second through hole 44; a third through hole 45; an X-ray generating device 46; and a wire shielding sleeve driving device 47. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the claims, description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. are for distinguishing different objects rather than for describing a specific order.

[0040] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the present invention.

[0041] In the claims, specification and the above drawings of the present invention, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0042] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0043] Example 1

[0044] Reference Figure 1 Embodiment 1 of the present invention provides an X-ray imaging system, which includes an X-ray beam limiter and an X-ray generating device 46, wherein the X-ray generating device 46 is suitable for use with the X-ray beam limiter and for generating X-rays, and the X-ray beam limiter is used to enable the X-rays generated by the X-ray generating device 46 to be emitted with a preset irradiation field, and the X-ray beam limiter provided in this embodiment can effectively reduce the scattering of X-rays, thereby avoiding blurring of the edge of the X-ray irradiation field.

[0045] Reference Figure 1 The X-ray generating device 46 can generate X-rays. When the X-rays are emitted, they have an optical axis. The range of the X-rays is called an irradiation field. The extension direction parallel to the optical axis forms an X-ray emission direction. When the X-ray generating device 46 generates X-rays, the X-ray emission direction is determined. At the same time, in this embodiment, it also includes a first direction and a second direction, which are perpendicular to each other and perpendicular to the X-ray emission direction.

[0046] Reference Figure 1 The X-ray beam limiter mainly includes a first wire shielding assembly 6, a second wire shielding assembly 12 and a wire shielding sleeve 18 which are arranged in sequence along the X-ray emission direction. The X-rays are emitted after passing through the first wire shielding assembly 6, the second wire shielding assembly 12 and the wire shielding sleeve 18 in sequence.

[0047] Reference Figure 1 The shielding sleeve 18 extends along the X-ray optical axis and has openings at both ends, and its inner edge surface is a rotation surface formed around the X-ray optical axis. Fig. 9 The openings at both ends of the wire shielding sleeve 18 and its inner edge surface define a third exit space 21 for X-ray emission. The length of the third exit space 21 in the direction of the X-ray optical axis is 2.5 to 3.5 times the distance between the opening of the wire shielding sleeve 18 on the side facing the second wire shielding component 12 and the X-ray emission focus, and the opening of the third exit space 21 on the side facing the second wire shielding component 12 covers the second exit space 17 on the projection plane perpendicular to the X-ray optical axis.

[0048] Specifically, refer to Figure 1 , Figure 2 Of the two openings at the shielding sleeve 18, the opening at the end closest to the X-ray generating device 46 is the first opening 19, and the opening at the other end is the second opening 20. Fig.10 and Fig.11 , the inner edge surface of the shielding sleeve 18 is a cylindrical surface or a conical surface. When it is a conical surface, the diameter of the inner edge surface gradually increases along the X-ray emission direction. In addition, the size of the first opening 19 is larger than the size of the second emission space 17, so that the X-rays emitted from the second emission space 17 can completely enter the third emission space 21. The length of the third emission space 21 in the direction of the X-ray optical axis is defined by the first opening 19, the second opening 20 and the X-ray emission focus. The X-ray emission focus is the position of the lamp bead that generates X-rays in the X-ray generating device 46, that is, the position of the light source. In this embodiment, the length of the third emission space 21 is the distance from the center of the first opening 19 to the center of the second opening 20, which is 2.5 times to 3.5 times the distance from the center of the first opening 19 to the light source. This length limit can ensure the normal operation of the X-ray beam limiter, and the shielding sleeve 18 will not affect the normal formation of the irradiation field, while ensuring that the shielding and absorption effect of scattered X-rays is excellent.

[0049] Specifically, refer to Figure 2 The X-ray beam limiter comprises a housing 1, which comprises a base 38 and a shell 39. The base 38 is a flat plate-shaped component, and the shell 39 is a box-shaped component. The shell 39 can be fixed on the base 38 upside down, so that an accommodating space is formed inside the housing 1. The second opening 20 of the shielding sleeve 18 is exposed from the shell 39.

[0050] Reference Figure 3 The X-ray beam limiter is provided with a first motor 2, a second motor 4, a first wire shielding assembly 6, a second wire shielding assembly 12 and a wire shielding sleeve 18 inside a housing 1.

[0051] Reference Figure 4 The first motor 2 is fixedly connected to the housing 1 and has a first output terminal 3, and the second motor 4 is fixedly connected to the housing 1 and has a second output terminal 5. The first wire shielding assembly 6 includes a first wire shielding plate 7 and a second wire shielding plate 8 arranged in pairs, and the two are slidably matched with the housing 1 along a first direction perpendicular to the X-ray optical axis; the second wire shielding assembly 12 includes a third wire shielding plate 13 and a fourth wire shielding plate 14 arranged in pairs, and the two are slidably matched with the housing 1 along a second direction perpendicular to the X-ray optical axis.

[0052] Reference Figure 4 In this embodiment, the first wire shielding assembly 6 further includes a first sliding shaft 32 , a second sliding shaft 33 and a third sliding shaft 34 , and the second wire shielding assembly 12 further includes a fourth sliding shaft 35 , a fifth sliding shaft 36 and a sixth sliding shaft 37 .

[0053] Reference Figure 5 , which shows the structure of the first wire shielding assembly 6 and the first motor 2. It should be noted that the structure of the second wire shielding assembly 12 and the second motor 4 is the same as that of the first wire shielding assembly 6 and the first motor 2, except that the arrangement directions of the two are orthogonal. Therefore, the structure of the first wire shielding assembly 6 and the first motor 2 is used as an example for explanation. In the first wire shielding assembly 6, the first wire shielding plate 7 and the second wire shielding plate 8 are provided with a first tooth portion 9 and a second tooth portion 10 with tooth tops facing each other. The first tooth portion 9 and the second tooth portion 10 are simultaneously engaged with the first output terminal 3 so that the first wire shielding plate 7 and the second wire shielding plate 8 move toward or away from each other under the drive of the first motor 2.

[0054] Reference Figure 5 The axial direction of the first output end 3 is parallel to the X-ray optical axis and the outer circumferential surface thereof is provided with the first motor 2 tooth portion along the circumferential direction, the first wire shielding plate 7 is provided with a first wire shielding portion 23 extending along the second direction and a first connecting portion 24 extending from the first wire shielding portion 23 and pointing to one end of the first direction, the second wire shielding plate 8 is provided with a second wire shielding portion 25 extending along the second direction and a second connecting portion 26 extending from the second wire shielding portion 25 and pointing to the other end of the first direction; the first connecting portion 24 and the second connecting portion 26 are arranged in the second direction and are respectively provided with a first tooth portion 9 and a second tooth portion 10; the first output end 3 is located between the first connecting portion 24 and the second connecting portion 26 to engage with the first tooth portion 9 and the second tooth portion 10 at the same time. In this embodiment, the first motor 2 is a stepper motor, which can accurately control the rotation angle of the first output terminal 3 according to the control signal. The first output terminal 3 is a gear, and its outer periphery forms the above-mentioned first motor 2 tooth portion. The first tooth portion 9 and the second tooth portion 10 are racks, and both are engaged with the tooth portion of the first motor 2 at the same time, and the engaging positions are located on opposite sides. Therefore, when the first output terminal 3 rotates, the first wire shielding plate 7 and the second wire shielding plate 8 will move synchronously, and the movement directions are opposite.

[0055] Reference Figure 5The first sliding shaft 32, the second sliding shaft 33 and the third sliding shaft 34 are all fixed to the shell 1 and are arranged along the second direction and extend along the first direction. The first wire shielding plate 7 and the second wire shielding plate 8 are slidably mounted on the first sliding shaft 32 at one end away from the first connecting part 24 and the second connecting part 26; the first wire shielding plate 7 is slidably mounted on the second sliding shaft 33 at one end away from the first sliding shaft 32; the second wire shielding plate 8 is slidably mounted on the third sliding shaft 34 at one end away from the first sliding shaft 32.

[0056] Reference Figure 3 and Figure 4 In the second wire shielding assembly 12, the third wire shielding plate 13 and the fourth wire shielding plate 14 are provided with a third tooth portion 15 and a fourth tooth portion 16 with tooth tops facing each other; the third tooth portion 15 and the fourth tooth portion 16 are simultaneously engaged with the second output end 5 so that the third wire shielding plate 13 and the fourth wire shielding plate 14 move toward or away from each other under the drive of the second motor 4.

[0057] Reference Figure 4 , the axial direction of the second output end 5 is parallel to the X-ray optical axis and the outer circumferential surface thereof is provided with a second motor 4 tooth portion along the circumferential direction; the third wire shielding plate 13 is provided with a third wire shielding portion 28 extending along the first direction and a third connecting portion 29 extending from the third wire shielding portion 28 and pointing to one end of the second direction, the fourth wire shielding plate 14 is provided with a fourth wire shielding portion 30 extending along the first direction and a fourth connection extending from the fourth wire shielding portion 30 and pointing to the other end of the second direction; the third connecting portion 29 and the fourth connecting portion 31 are arranged in the first direction and are respectively provided with a third tooth portion 15 and a fourth tooth portion 16; the second output end 5 is located between the third connecting portion 29 and the fourth connecting portion 31 to engage with the third tooth portion 15 and the fourth tooth portion 16 at the same time. In this embodiment, the second motor 4 is a stepper motor, which can accurately control the rotation angle of the second output terminal 5 according to the control signal. The second output terminal 5 is a gear, and its outer periphery forms the above-mentioned second motor 4 tooth portion. The third tooth portion 15 and the fourth tooth portion 16 are racks, and both are engaged with the second motor 4 tooth portion at the same time, and the engaging positions are located on opposite sides. Therefore, when the second output terminal 5 rotates, the third wire shielding plate 13 and the fourth wire shielding plate 14 will move synchronously, and the movement directions are opposite.

[0058] Reference Figure 4 The fourth sliding shaft 35, the fifth sliding shaft 36 and the sixth sliding shaft 37 are all fixed to the shell 1 and are arranged along the first direction and extend along the second direction. The third wire shielding plate 13 and the fourth wire shielding plate 14 are slidably mounted on the fourth sliding shaft 35 at one end away from the third connecting part 29 and the fourth connecting part 31; the third wire shielding plate 13 is slidably mounted on the fifth sliding shaft 36 at one end away from the fourth sliding shaft 35; the fourth wire shielding plate 14 is slidably mounted on the sixth sliding shaft 37 at one end away from the fourth sliding shaft 35.

[0059] Reference Figure 6, the first wire shielding plate 7 and the second wire shielding plate 8 are suitable for forming a first exit space 11 for X-rays to pass through; specifically, the first wire shielding portion 23 and the second wire shielding portion 25 form the above-mentioned first exit space 11; refer to Figure 7 A second exit space 17 for X-rays to pass through is formed between the third wire shielding plate 13 and the fourth wire shielding plate 14. Specifically, the second exit space 17 is formed between the third wire shielding portion 28 and the fourth wire shielding portion 30.

[0060] Under the action of the first motor 2, the first shielding plate 7 and the second shielding plate 8 can slide relative to the housing 1 along the sliding direction defined by the first sliding shaft 32, the second sliding shaft 33 and the third sliding shaft 34, and the sliding directions of the two are opposite at the same time, so the size of the first exit space 11 in the first direction will change accordingly; similarly, under the action of the second motor 4, the third shielding plate 13 and the fourth shielding plate 14 can slide relative to the housing 1 along the sliding direction defined by the fourth sliding shaft 35, the fifth sliding shaft 36 and the sixth sliding shaft 37, and the sliding directions of the two are opposite at the same time, so the size of the second exit space 17 in the second direction will change accordingly. By adjusting the sizes of the first exit space 11 and the second exit space 17 in the first direction and the second direction, when the X-ray is emitted from the X-ray generating device 46, the edges of its irradiation field in the first direction and the second direction will be limited by the first exit space 11 and the second exit space 17, and then enter the shielding sleeve 18.

[0061] It should be noted that the length of the wire shielding sleeve 18 in the direction of the X-ray optical axis will not affect the irradiation field defined by the first exit space 11 and the second exit space 17 under normal circumstances. For example, the edge of the X-ray irradiation field is just located within the second opening 20 of the wire shielding sleeve 18, that is, the edge of the X-ray irradiation field will not touch the inner edge surface of the wire shielding sleeve 18 in this case. At this time, the wire shielding sleeve 18 plays a role in preventing the X-rays from being scattered in the lateral direction; however, in some cases, the edge of the X-ray irradiation field will touch the inner edge surface of the wire shielding sleeve 18. At this time, the X-rays touching the inner edge surface of the wire shielding sleeve 18 will be absorbed, and other X-rays will be emitted from the second opening 20. In the above two cases, the wire shielding sleeve 18 can make the edge of the X-ray irradiation field clear and prevent lateral X-ray scattering.

[0062] Reference Figure 6 , and also includes a first layer plate 40, which is fixed to the shell 1 and is located on the side of the base 38 facing the X-ray emission direction, and is provided with a first through hole 43 that passes through the X-ray optical axis direction. The first wire shielding assembly 6 is suitable for covering or staying away from the first through hole 43 when driven by the first motor 2.

[0063] Reference Figure 7 , and also includes a second layer plate 41, which is fixed to the shell 1 and is located between the first wire shielding component 6 and the second wire shielding component 12, and is provided with a second through hole 44 that passes through the direction of the X-ray optical axis. The second wire shielding component 12 is suitable for covering or staying away from the second through hole 44 when driven by the second motor 4.

[0064] Reference Figure 8 and Fig. 9 , and also includes a third layer plate 42, which is fixed to the shell 1 and is located between the second wire shielding assembly 12 and the wire shielding sleeve 18, and is provided with a third through hole 45 that passes through along the X-ray optical axis direction; one end of the wire shielding sleeve 18 close to the third through hole 45 is fixed to the third layer plate 42, and the size of the opening of the end close to the third through hole 45 is not less than the size of the third through hole 45.

[0065] The first through hole 43, the second through hole 44 and the third through hole 45 are all circular through holes, and the three have the same size. When the X-ray is emitted, the first through hole 43, the second through hole 44 and the third through hole 45 can block part of the X-ray.

[0066] When installing, refer to Figure 6 , the first layer plate 40 is fixedly connected to one side of the base 38, the first sliding shaft 32, the second sliding shaft 33 and the third sliding shaft 34 are fixedly connected to the inner wall surface of the housing 39, and the first shielding assembly 6 is installed in the housing 1; refer to Figure 7 , the edge of the second layer plate 41 is fixedly connected to the inner wall surface of the housing 39, the fourth sliding shaft 35, the fifth sliding shaft 36 and the sixth sliding shaft 37 are fixedly connected to the inner wall surface of the housing 39, and the second wire shielding assembly 12 is installed in the housing 1, and the first motor 2 is installed on the second layer plate 41; refer to Figure 8 and Fig. 9 , the edge of the third layer plate 42 is fixedly connected to the inner wall surface of the outer shell 39, and the second motor 4 and the wire shielding sleeve 18 are installed to the third layer plate 42; then the base 38 with the first layer plate 40 installed is fixedly connected to the outer shell 39.

[0067] The present invention provides an X-ray beam limiter, which is provided with a first wire shielding component 6, a second wire shielding component 12 and a wire shielding sleeve 18. When the first motor 2 is running, the first wire shielding plate 7 and the second wire shielding plate 8 can be driven to move toward or away from each other, thereby adjusting the size of the first exit space 11. Similarly, when the second motor 4 is running, the third wire shielding plate 13 and the fourth wire shielding plate 14 can be driven to move toward or away from each other, thereby adjusting the size of the second exit space 17. The first wire shielding component 6 and the second wire shielding component 12 adjust the size of the X-ray illumination. The directions of the irradiation fields are different. The first wire shielding assembly 6 adjusts the irradiation field in the first direction, and the second wire shielding assembly 12 adjusts the irradiation field in the second direction. Through this structure, accurate adjustment of the X-ray irradiation field can be achieved, and since the first wire shielding plate 7 and the second wire shielding plate 8 are engaged with the first output end 3 at the same time, and the third wire shielding plate 13 and the fourth wire shielding plate 14 are engaged with the second output end 5 at the same time, as long as the motor is running, the paired wire shielding plates will move the same distance at the same speed, thereby making the position adjustment of the wire shielding plates more accurate and balanced. There will be no problem of different adjustment distances of paired wire shielding plates; and this structure simplifies the number of motors, and only two motors are needed to control the adjustment of the complete irradiation field; and the first wire shielding component 6 and the second wire shielding component 12 are arranged in sequence along the X-ray emission direction, so that the adjustment of the irradiation field in two directions can be separated. During control, the first wire shielding component 6 and the second wire shielding component 12 can be controlled in sequence, or the first wire shielding component 6 and the second wire shielding component 12 can be controlled simultaneously, thereby improving the control efficiency; in addition, a wire shielding sleeve 18 is provided, and the wire shielding sleeve 18 forms a third emission space 21. When the X-ray passes through the first wire shielding component 6 and the second wire shielding component 12, it will enter the wire shielding sleeve 18 and then leave from an opening at one end of the wire shielding sleeve 18. Since the wire shielding sleeve 18 extends along the X-ray optical axis direction, it can block the X-ray from scattering outside the wire shielding sleeve 18 when the X-ray is emitted, thereby concentrating the X-ray to the corresponding range, avoiding the scattering of the X-ray to affect other areas of the human body except the irradiation area; and effectively protecting doctors and nurses performing close-range surgery. Among them, the inner edge surface of the wire shielding sleeve 18 is set as a rotation surface around the X-ray optical axis, which can be a cylindrical surface or a conical surface, both of which can play a role in avoiding X-ray scattering. When it is a conical surface, it should be ensured that its diameter gradually increases along the X-ray emission direction to ensure that the X-ray can form an appropriate irradiation field.

[0068] Example 2

[0069] Reference Fig.12Embodiment 2 of the present invention provides an X-ray imaging system, which includes an X-ray beam limiter and an X-ray generating device 46, wherein the X-ray generating device 46 is suitable for use with the X-ray beam limiter and for generating X-rays, and the X-ray beam limiter is used to enable the X-rays generated by the X-ray generating device 46 to be emitted with a preset irradiation field, and the X-ray beam limiter provided in this embodiment can effectively reduce the scattering of X-rays, thereby avoiding blurring of the edge of the X-ray irradiation field.

[0070] Reference Fig.12 The X-ray generating device 46 can generate X-rays. When the X-rays are emitted, they have an optical axis. The range of the X-rays is called an irradiation field. The extension direction parallel to the optical axis forms an X-ray emission direction. When the X-ray generating device 46 generates X-rays, the X-ray emission direction is determined. At the same time, in this embodiment, it also includes a first direction and a second direction, which are perpendicular to each other and perpendicular to the X-ray emission direction.

[0071] Reference Fig.12 The difference between the X-ray beam limiter in Example 2 and the X-ray beam limiter in Example 1 is that the first wire shielding assembly 6 and the second wire shielding assembly 12 in Example 1 are removed, and the wire shielding sleeve 18 is slidably connected to the shell 1 along the X-ray optical axis direction, and a wire shielding sleeve driving device 47 is provided.

[0072] Among them, the wire shielding sleeve driving device 47 is drivingly connected to the wire shielding sleeve 18, and the wire shielding sleeve driving device 47 is used to drive the wire shielding sleeve 18 to reciprocate within a preset range along the X-ray optical axis direction. As a specific implementation, the wire shielding sleeve driving device 47 can use a motor as a driving source, connect the output shaft of the motor to the rack structure shown in Example 1, and the rack structure is fixedly connected to the wire shielding sleeve 18, so that the wire shielding sleeve 18 can be driven by the motor to move. The wire shielding sleeve 18 can be slidably connected to the housing 1 through a slide rail structure, and the moving range of the wire shielding sleeve 18 can be limited by limiting the slide rail stroke.

[0073] By using the wire shielding sleeve driving device 47 and setting the wire shielding sleeve 18 to be movable relative to the shell 39, the first wire shielding assembly 6 and the second wire shielding assembly 12 in Example 1 can be removed, and the range of the irradiation field can be adjusted by moving the wire shielding sleeve 18, and there is no need to control and adjust the first wire shielding assembly 6 and the second wire shielding assembly 12; in addition, the wire shielding sleeve 18 not only adjusts the range of the irradiation field, but according to the description of Example 1, it can be known that the wire shielding sleeve 18 can also reduce X-ray scattering and protect doctors and nurses performing close-range surgery.

[0074] The description of the above specification and embodiments is used to explain the protection scope of the present invention, but does not constitute a limitation on the protection scope of the present invention. Through the enlightenment of the present invention or the above embodiments, ordinary technicians in this field can obtain modifications, equivalent substitutions or other improvements to the embodiments of the present invention or part of the technical features thereof through logical analysis, reasoning or limited experiments, which should be included in the protection scope of the present invention.

Claims

1. An X-ray beam limiter, characterized in that: include: Housing (1); A first motor (2) which is fixed to the housing (1) and has a first output end (3); A second motor (4) which is fixed to the housing (1) and has a second output end (5); A first wire shielding assembly (6), comprising a first wire shielding plate (7) and a second wire shielding plate (8) arranged in pair, the two being slidably matched with the housing (1) along a first direction perpendicular to the X-ray optical axis, and being provided with a first tooth portion (9) and a second tooth portion (10) with tooth tops facing each other; the first tooth portion (9) and the second tooth portion (10) are simultaneously engaged with the first output end (3) so that the first wire shielding plate (7) and the second wire shielding plate (8) move towards or away from each other under the drive of the first motor (2); a first exit space (11) is formed between the first wire shielding plate (7) and the second wire shielding plate (8) for X-rays to pass through; A second wire shielding assembly (12) comprises a third wire shielding plate (13) and a fourth wire shielding plate (14) arranged in pairs, the two being slidably matched with the housing (1) along a second direction perpendicular to the X-ray optical axis, and provided with a third tooth portion (15) and a fourth tooth portion (16) with tooth tops facing each other; the third tooth portion (15) and the fourth tooth portion (16) are simultaneously engaged with the second output end (5) so that the third wire shielding plate (13) and the fourth wire shielding plate (14) move towards or away from each other under the drive of the second motor (4); the third wire shielding plate (13) and the fourth wire shielding plate (14) are 4) is suitable for forming a second exit space (17) for X-rays to pass through; a wire shielding sleeve (18) extending along the X-ray optical axis and having openings at both ends, and its inner edge surface is a rotation surface formed around the X-ray optical axis; the openings at both ends of the wire shielding sleeve (18) and its inner edge surface define a third exit space (21) for X-rays to pass through, and the length of the third exit space (21) in the direction of the X-ray optical axis is 2.5 times to 3.5 times the distance between the opening of the wire shielding sleeve (18) on the side facing the second wire shielding assembly (12) and the X-ray exit focus; The first wire shielding assembly (6), the second wire shielding assembly (12) and the wire shielding sleeve (18) are arranged in sequence along the X-ray emission direction, and the opening of the third emission space (21) facing the side of the second wire shielding assembly (12) covers the second emission space (17) on a projection plane perpendicular to the X-ray optical axis direction.

2. An X-ray beam limiter as claimed in claim 1, characterized in that: The axial direction of the first output end (3) is parallel to the X-ray optical axis and the outer peripheral surface thereof is provided with the first motor (2) tooth portion along the circumferential direction; the first wire shielding plate (7) is provided with a first wire shielding portion (23) extending along the second direction and a first connecting portion (24) extending from the first wire shielding portion (23) and pointing to one end of the first direction; the second wire shielding plate (8) is provided with a second wire shielding portion (25) extending along the second direction and a second connecting portion (26) extending from the second wire shielding portion (25) and pointing to the other end of the first direction; the first wire shielding portion (23) and the second wire shielding portion (25) are suitable for forming the first emission space (11); the first connecting portion (24) and the second connecting portion (26) are arranged in the second direction and are respectively provided with the first tooth portion (9) and the second tooth portion (10); the first output end (3) is located between the first connecting portion (24) and the second connecting portion (26) so as to mesh with the first tooth portion (9) and the second tooth portion (10) at the same time.

3. An X-ray beam limiter as claimed in claim 2, characterized in that: The axial direction of the second output end (5) is parallel to the X-ray optical axis and the outer peripheral surface thereof is provided with a second motor (4) tooth portion in the circumferential direction; the third wire shielding plate (13) is provided with a third wire shielding portion (28) extending in the first direction and a third connecting portion (29) extending from the third wire shielding portion (28) and pointing to one end of the second direction; the fourth wire shielding plate (14) is provided with a fourth wire shielding portion (30) extending in the first direction and a third wire shielding portion (30) extending from the fourth wire shielding portion (30) and pointing to the other end of the second direction. The fourth connecting portion (31) is adapted to form the second emission space (17) between the third wire shielding portion (28) and the fourth wire shielding portion (30); the third connecting portion (29) and the fourth connecting portion (31) are arranged in the first direction and are respectively provided with the third tooth portion (15) and the fourth tooth portion (16); the second output end (5) is located between the third connecting portion (29) and the fourth connecting portion (31) so as to mesh with the third tooth portion (15) and the fourth tooth portion (16) at the same time.

4. An X-ray beam limiter as claimed in claim 3, characterized in that: The first wire shielding assembly (6) also includes a first sliding shaft (32), a second sliding shaft (33) and a third sliding shaft (34) fixed to the shell (1) and arranged along the second direction and extending along the first direction; one end of the first wire shielding plate (7) and the second wire shielding plate (8) away from the first connecting part (24) and the second connecting part (26) are simultaneously hung and slidably arranged on the first sliding shaft (32); one end of the first wire shielding plate (7) away from the first sliding shaft (32) is hung and slidably arranged on the second sliding shaft (33); one end of the second wire shielding plate (8) away from the first sliding shaft (32) is hung and slidably arranged on the third sliding shaft (34).

5. An X-ray beam limiter as claimed in claim 4, characterized in that: The second wire shielding assembly (12) also includes a fourth sliding shaft (35), a fifth sliding shaft (36) and a sixth sliding shaft (37) fixed to the shell (1), arranged along the first direction and extending along the second direction; the third wire shielding plate (13) and the fourth wire shielding plate (14) are simultaneously slidably mounted on the fourth sliding shaft (35) at one end away from the third connecting portion (29) and the fourth connecting portion (31); the third wire shielding plate (13) is slidably mounted on the fifth sliding shaft (36) at one end away from the fourth sliding shaft (35); and the fourth wire shielding plate (14) is slidably mounted on the sixth sliding shaft (37) at one end away from the fourth sliding shaft (35).

6. An X-ray beam limiter as claimed in claim 5, characterized in that: The housing (1) comprises a base (38) and an outer shell (39) covered on the base (38); the first sliding shaft (32), the second sliding shaft (33), the third sliding shaft (34), the fourth sliding shaft (35), the fifth sliding shaft (36) and the sixth sliding shaft (37) are fixedly connected to the inner wall of the outer shell (39); and one end of the wire shielding sleeve (18) for emitting X-rays is opened and exposed to the outer shell (39).

7. An X-ray beam limiter as claimed in claim 6, characterized in that: The invention also comprises a first layer plate (40), a second layer plate (41) and a third layer plate (42); the first layer plate (40) is fixed to the shell (1) and is located on the side of the base (38) facing the X-ray emission direction, and is provided with a first through hole (43) extending along the X-ray optical axis direction, and the first wire shielding component (6) is suitable for covering or moving away from the first through hole (43) under the drive of the first motor (2); the second layer plate (41) is fixed to the shell (1) and is located between the first wire shielding component (6) and the second wire shielding component (12), and is provided with a first through hole (43) extending along the X-ray optical axis direction. The second through hole (44) is disposed near the second wire shielding assembly (12), and the second wire shielding assembly (12) is suitable for covering or keeping away from the second through hole (44) when driven by the second motor (4); the third layer plate (42) is fixed to the housing (1) and is located between the second wire shielding assembly (12) and the wire shielding sleeve (18), and is provided with a third through hole (45) passing through along the direction of the X-ray optical axis; one end of the wire shielding sleeve (18) close to the third through hole (45) is fixedly connected to the third layer plate (42), and the size of the opening of the end close to the third through hole (45) is not less than the size of the third through hole (45).

8. An X-ray beam limiter as claimed in claim 7, characterized in that: The inner edge surface of the wire shielding sleeve (18) is a cylindrical surface or a conical surface. When it is a conical surface, the diameter of the inner edge surface gradually increases along the X-ray emission direction.

9. An X-ray beam limiter, characterized in that: include: Housing (1); A wire shielding sleeve (18) extending along the X-ray optical axis and provided with openings at both ends, wherein the inner edge surface is a rotation surface formed around the X-ray optical axis; the openings at both ends of the wire shielding sleeve (18) and the inner edge surface define a third exit space (21) for X-rays to pass through, wherein the length of the third exit space (21) in the direction of the X-ray optical axis is 2.5 to 3.5 times the distance between the opening of the wire shielding sleeve (18) on the side facing the second wire shielding assembly (12) and the X-ray exit focus; the wire shielding sleeve (18) is slidably mounted on the housing (1) along the direction of the X-ray optical axis; and A wire shielding sleeve driving device (47) is mounted on the housing (1) and is used to drive the wire shielding sleeve (18) to move back and forth within a preset range along the X-ray optical axis direction.

10. An X-ray imaging system, characterized in that: include: An X-ray beam limiter as claimed in any one of claims 1 to 9; and An X-ray generating device (46) is adapted to cooperate with the X-ray beam limiter and is used to generate X-rays.

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