Ray filtering mechanism and beam limiting device

Abstract

The invention provides a ray filtering mechanism and a beam limiting device, the ray filtering mechanism comprises at least two filtering groups, each filtering group is sequentially overlapped and relatively rotatably arranged, and each filtering group comprises a filtering disc capable of rotatably moving around the axis of the filtering disc; the plurality of filtering windows are annularly arranged on the filtering disc along the circumferential direction of the filtering disc; the filtering plate covers the filtering window; and the driving device is used for driving the filtering plate to rotate. According to the technical scheme, the driving device is remotely controlled to enable the filtering discs of the filtering group to rotate, switching of filtering plates of different positions, different thicknesses or models is achieved, the filtering discs of the ray filtering mechanism automatically operate and rotate according to parameter setting, and therefore a clear exposure image is obtained; meanwhile, the risk that a patient and medical staff are subjected to X-ray radiation can be reduced; the ray filtering mechanism also has the substantive advantages of simple structure, high stability, convenience in use and the like.

Description

Technical Field

[0001] This application relates to the technical field of medical diagnostic and treatment equipment, and particularly to a ray filtering mechanism and a collimator. Background Art

[0002] An X-ray detection device utilizes the penetration, differential absorption, photosensitivity, and fluorescence effects of X-rays on an object to project the density distribution information of each part of the object onto an X-ray acquisition and imaging device, forming a corresponding image, thereby observing the internal structure and conditions of the object. Due to its ability to achieve non-destructive detection and evaluation of the object to be detected, the X-ray detection device has a wide range of applications in non-destructive testing in the medical, industrial, and security fields.

[0003] Existing X-ray detection devices usually use a collimator to adjust the radiation range of the rays. The collimator, also known as a "beam blocker", "light reducer", or "beam limiter", is installed at the window of the X-ray tube and is used to block unnecessary primary X-rays during X-ray examinations. It can limit the X-ray irradiation field to the smallest required range, minimizing the dose of X-rays received by the patient. Currently, a copper filter is usually used in the collimator to improve the image quality. However, for different filtering requirements, copper sheets of different thicknesses are selected. There are many problems during the replacement process of the copper sheets, such as long switching time, manual participation in the switching process, long secondary confirmation time, and long stabilization time, etc. The operating experience and convenience of the operator are relatively poor.

[0004] Therefore, an improved technical solution is needed to address the above deficiencies in the prior art. Summary of the Invention

[0005] In view of the above-mentioned disadvantages of the prior art, the purpose of this application is to provide a ray filtering mechanism and a collimator to solve at least one or more technical problems existing in the prior art.

[0006] In a first aspect, this application provides a ray filtering mechanism, including at least two filtering groups, each of which is arranged in an overlapping and relatively rotatable manner in sequence. Each filtering group includes:

[0007] A filtering disk that can rotate around its axis;

[0008] A plurality of filtering windows that are circumferentially arranged on the filtering disk;

[0009] A filtering plate covering the filtering windows;

[0010] A driving device for driving the rotation of the filtering disk.

[0011] In one embodiment, the filtration group includes a stacked first filtration group and a second filtration group, and the rotation axes of the first filtration group and the second filtration group are on the same straight line.

[0012] In one embodiment, the filtration disc is a circular turntable.

[0013] In one embodiment, the driving device includes:

[0014] A first driving device for driving the filtration disc of the first filtration group to rotate around its axis;

[0015] The first driving device is a belt drive.

[0016] In one embodiment, the driving device includes:

[0017] A second driving device for driving the filtration disc of the second filtration group to rotate around its axis;

[0018] The second driving device is a gear drive.

[0019] In one embodiment,

[0020] The second filtration group includes a second filtration disc, and gears are provided at the edge of the second filtration disc;

[0021] The second driving device includes a second driving gear located outside the second filtration disc, and the second filtration size meshes with the gear at the edge of the second filtration disc.

[0022] In one embodiment, four filtration windows are provided on each filtration disc, and each filtration window is arranged at equal angles and equal intervals on the filtration disc; when the first filtration group and the second filtration group rotate relative to each other, there are overlapping alignment points of the filtration windows of the first filtration group and the second filtration group.

[0023] In one embodiment, the filtration window is a rectangular window, and the midline of the rectangular window is parallel or perpendicular to the radial direction of the filtration disc.

[0024] In one embodiment, a positioning notch is provided at the edge of the filtration disc as a rotation positioning identification mark.

[0025] In a second aspect, the present application provides a collimator, including a housing and a ray filtration mechanism. The housing has a housing bottom surface and a housing top surface that are oppositely arranged. The ray filtration mechanism is provided on the housing top surface for selectively filtering rays; the ray filtration mechanism is any one of the above technical solutions of the ray filtration mechanism.

[0026] Compared with the prior art, the technical solution provided by the present application has the following beneficial effects:

[0027] The ray filtering mechanism provided by the present application is provided with at least two filtering groups, and each filtering group is sequentially overlapped and rotatable relative to each other. By rotating the filter disks of the filtering groups by different angles, the filter plates corresponding to different filtering windows are selected. In this technical solution, a driving device is also configured to replace manual operation and perform automatic control through a host computer. The driving device is remotely controlled to rotate the filter disks of the filtering groups, so as to realize the switching of filter plates at different positions, different thicknesses or models. The filter disks of the ray filtering mechanism rotate automatically according to parameter settings, so as to obtain a clear exposure image, and at the same time, it can also reduce the risk of X-ray radiation to patients and medical staff; the ray filtering mechanism also has substantial advantages such as simple structure, high stability and convenient use.

[0028] In addition, since the beam limiter provided by the present application is configured with the above-mentioned ray filtering mechanism, the beam limiter and other supporting devices such as the detection equipment using the beam limiter also have the above-mentioned advantages. Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the ray filtering mechanism of the beam limiter in the prior art;

[0030] Figure 2 It is a schematic structural diagram of one perspective of the ray filtering mechanism provided in Embodiment 1 of the present application;

[0031] Figure 3 It is a schematic structural diagram of another perspective of the ray filtering mechanism provided in Embodiment 1 of the present application;

[0032] Figure 4 It is a schematic cross-sectional diagram of the ray filtering mechanism provided in Embodiment 1 of the present application;

[0033] Figure 5 It is a schematic structural diagram of the first filtering group provided in Embodiment 1 of the present application;

[0034] Figure 6 It is a schematic structural diagram of the second filtering group provided in Embodiment 2 of the present application;

[0035] Figure 7 It is a schematic external structural diagram of the beam limiter provided in Embodiment 2 of the present application;

[0036] Figure 8 It is a schematic internal assembly structural diagram of the beam limiter provided in Embodiment 2 of the present application.

[0037] Description of the Reference Numerals:

[0038] 1. First filter group; 101. First filter disc; 1011. First filter window group; 102. First filter plate group; 103. First driving device; 1031. First motor; 1032. First driving wheel; 1033. First driven wheel; 1034. Conveyor belt; 1035. First support plate; 104. First photoelectric switch;

[0039] 2. Second filter group; 201. Second filter disc; 2011. Second filter window group; 202. Second filter plate group; 203. Second drive device; 2031. Second motor; 2032. Second drive gear; 2033. Second support plate; 204. Second photoelectric switch;

[0040] 3. Bearing group;

[0041] 4. Adapter plate;

[0042] 5. beam limiter; 501. cover; 502. reference assembly;

[0043] 6. External filter plate. DETAILED DESCRIPTION

[0044] At present, beam limiters usually use copper filters to improve image quality. However, different thicknesses of copper sheets are used for different filtering requirements. For example, the commonly used copper sheets are 0.1mm, 0.2mm and 0.3mm thick. However, there are many problems in the process of replacing the copper sheets. At present, beam limiters usually use an external additional filter plate structure or a manually switched filter plate structure to realize the copper sheet replacement process. Figure 1 As shown, the external filter plate 6 is inserted into the slot through the bottom of the beam limiter according to the use requirements. The manual switching filter disc structure is to fix the filter copper sheets of different thicknesses on the filter disc with a rotating clamp, and then fix the filter disc on the top plate of the beam limiter. When in use, filter copper sheets of different thicknesses can be obtained by turning the disc. The above two switching methods are very inconvenient to use, and the switching time is long, the switching process requires manual participation, and the secondary confirmation time and stabilization time are long, etc., and the operator's user experience and convenience are poor.

[0045] In order to change this cumbersome usage mode, the present application provides an electric switching filtering mechanism placed inside the beam limiter.

[0046] The following describes the implementation of the present application through specific examples, and those skilled in the art can easily understand other advantages and principles of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application.

[0047] When describing the embodiments of the present invention in detail, for the convenience of description, the cross-sectional views showing the device structure will be locally enlarged in a non-general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention here. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0048] Here, expressions such as "between... and..." may be used, which means including both end values, and expressions such as "a plurality of" may be used, which means two or more, unless otherwise specifically defined. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0049] For the convenience of description, one side direction of the first filtration group is defined as downward, and one side direction of the second filtration group is defined as upward.

[0050] Embodiment 1:

[0051] As Figures 2-6 shown, this embodiment provides a ray filtration mechanism, which includes at least two filtration groups, each filtration group is sequentially overlapped and relatively rotatably arranged, and the filtration group includes:

[0052] A filtration disk, which can rotate around its axis.

[0053] A plurality of filtration windows, and the above-mentioned plurality of filtration windows are annularly arranged on the filtration disk along the circumferential direction of the filtration disk;

[0054] A filtration plate, which covers the above-mentioned filtration windows;

[0055] A driving device, which is used to drive the rotation of the filtration disk.

[0056] By adopting the above technical solution, the filtration disk of the filtration group is rotated by different angles to select the filtration plate corresponding to different filtration windows, a driving device is configured to replace manual operation, and automatic control is carried out through a host computer. The driving device is remotely controlled to rotate the filtration disk of the filtration group, so as to realize the rapid and accurate switching of filtration plates at different positions, different thicknesses or models. The filtration disk of the ray filtration mechanism can automatically run and rotate according to parameter settings, so as to obtain a clear exposure image, effectively solving the problems of slow switching of existing filtration plates and cumbersome switching processes.

[0057] In one embodiment, refer to Figures 2-6The filter group includes a first filter group 1 and a second filter group 2 stacked together, and the rotation axes of the first filter group 1 and the second filter group 2 are located on the same straight line, that is, the first filter group 1 and the second filter group 2 can rotate coaxially. Further, the first filter group 1 and the second filter group 2 can share the same bearing group 3.

[0058] In one embodiment, the filter disc is a circular rotating disc, that is, the first filter disc 101 and the second filter disc 201 are both circular rotating discs. Reasonable layout saves more space and effectively utilizes the space of the beam limiter. The circular rotating disc can be used as a driven gear and directly cooperate with other driving devices to optimize the assembly structure. It can be understood that

[0059] In some embodiments, the driving device includes a first driving device 103 for driving the first filter disc 101 of the first filter group 1 to rotate around its axis.

[0060] Specifically, the first driving device 103 is a belt drive, see Figures 2-5 , Figure 2 The schematic structure of the ray filtering mechanism from a bottom perspective is shown. Figure 5 The schematic structure of another perspective of the bottom surface of the first filter group 1 is shown. The first drive device 103 includes a first support plate 1035 located at the bottom of the first filter disc 101, and is assembled on the beam limiter through the first support plate 1035. The first support plate 1035 is arranged along the radial direction of the first filter disc 101 to avoid blocking the filter window on its side, and provides a support function and installation basis for the arrangement of the bearing group 3. The first drive device 103 also includes a first motor 1031 arranged at the bottom of the first support plate 1035, a first driving wheel 1032 arranged on the first motor 1031, and a first driven wheel 1033 arranged at the bottom of the first filter disc 101. The first driving wheel 1032 and the first driven wheel 1033 are connected by a transmission belt 1034. During operation, the first motor 1031 drives the first driving wheel 1032, and the first driven wheel 1033 is driven to rotate through the conveyor belt 1034, so that the first filter disc 101 rotates to realize the switching of the filter window and the replacement of the filter plate. The first driving device 103 disposed at the bottom of the first filter disc 101 effectively utilizes the internal space of the beam limiter and optimizes the assembly structure of the beam limiter.

[0061] In some embodiments, the driving device includes a second driving device 203 for driving the second filter disc 201 of the second filter group 2 to rotate around its axis.

[0062] Specifically, the second driving device 203 is a gear transmission, see Figures 2-4 , Figure 6 , Figure 6The schematic structure of a perspective view of the top surface of the second filtration group 2 is shown. The second driving device 203 includes a second motor 2031 and a second driving gear 2032 disposed on the top of the second motor 2031. The second motor 2031 is mounted on the first support plate 1035 through a second support plate 2033. The edge of the second filtration disk 201 is configured as a gear structure, and the second driving gear 2032 meshes with the gear on the edge of the second filtration disk 201. During operation, the second motor 2031 rotates the second driving gear 2032 to drive the second filtration disk 201 to rotate, realizing the switching of the filtration windows and the replacement of the filtration plates. The second driving device 203 disposed outside the second filtration disk 201 also effectively utilizes the internal space of the beam limiter. The gear drive saves the overall occupied space of the ray filtration mechanism and optimizes the assembly structure of the beam limiter.

[0063] In some embodiments, referring to Figures 2-6 , four filtration windows are provided on each filtration disk. That is, a first filtration window group 1011 is provided on the first filtration disk 101. The first filtration window group 1011 includes four filtration windows, and each filtration window is arranged at equal angles and equal intervals on the first filtration disk 101; a second filtration window group 2011 is also provided on the second filtration disk 201. The second filtration window group 2011 also includes four filtration windows, and each filtration window is arranged at equal angles and equal intervals on the second filtration disk 201; moreover, the window positions, sizes, and angle settings of the first filtration window group 1011 and the second filtration window group 2011 are the same. In this way, when the first filtration group 1 and the second filtration group 2 rotate relative to each other, the specific filtration window selected on the first filtration disk 101 and the specific filtration window selected on the second filtration disk 201 will reach the overlapping alignment point, realizing the overlapping configuration of filtration plates with different thicknesses, and achieving various clinical requirements through the combination of filtration plates with different thicknesses.

[0064] Furthermore, among the four filtration windows of each filtration disk, three filtration windows can be selected to set three filtration plates with different thicknesses, such as 0.1 mm, 0.2 mm, and 0.3 mm. The fourth filtration window is a vacant window and can be used in superposition with other filtration plates of another filtration disk. Specifically, anti-fooling design and marking can be carried out for the three filtration windows where the filtration plates are set. For example, size markings can be made beside the filtration windows for installing the filtration plates with corresponding thicknesses for distinction to prevent operation errors.

[0065] Furthermore, the material of the filtration plate is a copper sheet.

[0066] It can be understood that the number of filtration windows provided is at least one, for example, it can be 2, 4, 6, 8 or even more. To reasonably use the area of the circular filtration disk and considering the manufacturing cost, usually four filtration windows are selected, which can basically meet the clinical use requirements.

[0067] In the above embodiment, the filtering window is a rectangular window, and the median line of the rectangular window is parallel or perpendicular to the radial direction of the filtering disk, which can provide the maximum adjustment space range for the ray to pass through. Further, the filtering window can be a square structure with equal length and width.

[0068] In some embodiments, the first filtering disk 101 is configured with a first optoelectronic switch 104. Refer to Figure 2 , the first optoelectronic switch 104 is disposed at the outer edge of the first filtering disk 101 through an adapter plate 4, and the adapter plate 4 is disposed on the first support plate 1035.

[0069] In the above embodiment, positioning notches are provided at the edge of the filtering disk as rotational positioning identification marks. Specifically, the number of the notches is the same as the number of filtering windows configured on each filtering disk, so as to facilitate accurate positioning identification for each switching of the filter plate. When both the first filtering disk 101 and the second filtering disk 201 are provided with four filtering windows, four notches are also correspondingly provided on each filtering disk for filtering window positioning.

[0070] In some embodiments, the first filtering disk 101 is also configured with a second optoelectronic switch 204. Refer to Figure 2 and Figure 6 , the second optoelectronic switch 204 is also disposed at the outer edge of the second filtering disk 201 through the adapter plate 4. It can be understood that the first optoelectronic switch 104 and the second optoelectronic switch 204 share an adapter plate 4 to achieve their positioning and installation, reasonably utilizing the internal space of the beam limiter, achieving equipment lightweight and reducing the manufacturing cost.

[0071] Embodiment 2:

[0072] This embodiment provides a beam limiter 5. Refer to Figures 7-8 , the beam limiter 5 includes a housing 501 and a ray filtering mechanism. The housing 501 has a housing bottom surface and a housing top surface which are oppositely arranged, and the ray filtering mechanism is disposed on the housing top surface for selectively filtering rays; the ray filtering mechanism is the ray filtering mechanism provided by any one of the technical solutions in Embodiment 1.

[0073] Specifically, refer to Figure 7 , a reference assembly 502 is further disposed above the ray filtering mechanism. The reference assembly 502 is also installed on the housing top surface. The reference assembly 502 includes a lead bowl for limiting the final radiation area of the ray, and the lead bowl is installed on the housing top surface through a top flange connecting member. It can be understood that the coverage area of the lead bowl is less than or equal to the area of the filtering window. It can be understood that protective lead plates (not shown in the figure) are provided on the inner side walls, top surface and bottom surface of the housing 501 to prevent rays from causing harm to patients or medical staff.

[0074] Specifically, refer toFigure 8 , Figure 8 shows the top view structure of the beam limiter after removing the top plate of the housing. During the rotation of the first filtration group 1 and the second filtration group 2, their filtration windows can be successively rotated to the area overlapping with the position of the lead bowl, that is, the center of the filtration window coincides with the center of the lead bowl. By rotating and switching the filter plates, it is more efficient and convenient than the existing process of taking out and inserting the films, greatly improving the clinical operation efficiency of medical staff.

[0075] In summary, the ray filtration mechanism provided in this application is provided with at least two filtration groups, and each filtration group is arranged in an overlapping and relatively rotatable manner in sequence. By rotating the filtration disks of the filtration groups by different angles, the filter plates corresponding to different filtration windows are selected. In this technical solution, a driving device is also configured to replace manual operation, and automatic control is performed through a host computer. The driving device is remotely controlled to rotate the filtration disks of the filtration groups, realizing the switching of filter plates at different positions, different thicknesses or models. The filtration disks of the ray filtration mechanism rotate automatically according to parameter settings, so as to obtain clear exposure images, and at the same time, the risk of X-ray radiation to patients and medical staff can be reduced; the ray filtration mechanism also has substantial advantages such as simple structure, high stability and convenient use; since the beam limiter provided in this application is configured with the above ray filtration mechanism, therefore, the beam limiter and other supporting devices such as the detection equipment using the beam limiter also have the above advantages.

[0076] The technical solution of this application solves a variety of existing thorny problems, solves the problems existing in the switching process of the additional filtration device of the existing beam limiter, such as long switching time, long image secondary confirmation time and long stabilization time, inaccurate dose calculation, affecting the surgical efficiency and poor doctor experience. The filter plate of the ray filtration structure of this application can be switched quickly, and clearer captured images can be obtained; the ray filtration mechanism of this application can more accurately control the position of the filter plate through an optoelectronic switch; the ray filtration mechanism of this application is hidden inside the beam limiter housing as a whole, and is not easily affected by external factors to cause the offset or misoperation of the filter plate position, and the overall size of the beam limiter can be reduced; through the setting of the double-layer filtration component, filter plates with different thicknesses can be obtained, the range of free adjustment of the ray dose is wider, and the impact of radiation on patients can be reduced; electric control can be remotely operated, and the impact of radiation on medical staff can also be reduced. Therefore, this application effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0077] The above embodiments are only illustrative of the principles and effects of the present application and are not intended to limit the present application. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in the present application should still be covered by the claims of the present application.

Claims

1. A ray filtering mechanism, characterized in that, Comprising at least two filtering groups, each of the filtering groups being sequentially overlapped and rotatable relative to each other, the filtering group comprising: A filtering disk, which is rotatable about its axis; A plurality of filtering windows, which are circumferentially arranged on the filtering disk along the circumference of the filtering disk; A filtering plate, covering the filtering window; A driving device for driving the rotation of the filtering disk.

2. The ray filtering mechanism according to claim 1, wherein The filtering group comprises a stacked first filtering group and a second filtering group, and the rotation axes of the first filtering group and the second filtering group are located on the same straight line.

3. The ray filtration mechanism according to claim 1, wherein The filtering disk is a circular turntable.

4. The ray filtering mechanism according to claim 2, wherein The driving device comprises: A first driving device for driving the filtering disk of the first filtering group to rotate about its axis; The first driving device is a belt drive.

5. The ray filtering mechanism according to claim 2, characterized in that, The driving device comprises: A second driving device for driving the filtering disk of the second filtering group to rotate about its axis; The second driving device is a gear drive.

6. The ray filtering mechanism according to claim 5, wherein The second filtering group comprises a second filtering disk, and gears are provided at the edge of the second filtering disk; The second driving device comprises a second driving gear located outside the second filtering disk, and the second filtering size meshes with the gear at the edge of the second filtering disk.

7. The ray filtration mechanism according to claim 2, wherein, Four filtering windows are provided on each of the filtering disks, and each of the filtering windows is arranged at equal angles and at equal intervals on the filtering disk; when the first filtering group and the second filtering group rotate relative to each other, there are overlapping alignment points of the filtering windows of the first filtering group and the second filtering group.

8. The ray filtering mechanism according to claim 7, characterized in that, The filtering window is a rectangular window, and the midline of the rectangular window is parallel or perpendicular to the radial direction of the filtering disk.

9. The ray filtering mechanism according to claim 1, characterized in that, A positioning notch is provided at the edge of the filtering disk as a rotation positioning identification mark.

10. A collimator, characterized in that, Comprising a housing and a ray filtering mechanism, the housing has a housing bottom surface and a housing top surface which are oppositely arranged, the ray filtering mechanism is arranged on the housing top surface for selectively filtering rays; the ray filtering mechanism is the ray filtering mechanism according to any one of claims 1 to 9.

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