Shading piece, diaphragm and radiation field collimation system

Abstract

The utility model discloses a shading piece, a diaphragm and a radiation field collimation system, relates to the technical field of medical equipment, and aims to solve the problem that organs and healthy tissues around a target region are endangered to be subjected to unnecessary dose injury due to the fact that a tungsten gate is difficult to dynamically move along with a radiation field due to heavy self weight in the related technology. The shading piece comprises a shading plate and a base body, and the shading plate is used for shading rays; the shading plate is provided with a first surface and a second surface which are back to back, and the base body is arranged on the first surface. Wherein the density of the base body is smaller than that of the light shielding plate. The shading piece is jointly made of the base body with the relatively small density and the shading plate with the relatively large density, the weight of the shading piece is smaller than that of an existing tungsten door, the shielding requirement can be met, the loss of the driving device can be reduced, therefore, the movement precision is improved, and then the dosage endangering organs and normal tissue is reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment technology, and in particular to a light shield, a light aperture, and a beam collimation system. Background Technology

[0002] Radiation therapy is a treatment method for tumors that primarily uses high-energy rays to kill or control the growth of cancer cells, thereby achieving the treatment of tumors. Intensity-modulated radiotherapy (IMRT) is an important method of radiation therapy. The field collimation system is a crucial component for conducting IMRT, mainly used to shield a portion of the radiation emitted from the radiation source and adjust the shape of the radiation field to match the shape of the target area. This ensures that the radiation emitted from the radiation source is concentrated on the target area, avoiding unnecessary radiation doses to organs and normal tissues.

[0003] In related technologies, a radiation field collimation system includes a drive device, a grating, and two tungsten gates made of tungsten alloy. The grating has opposing incident and exit sides, and the two tungsten gates are located on the incident side of the grating. The grating includes two sets of blades spaced apart, with the arrangement direction of the two sets of blades perpendicular to the arrangement direction of the two tungsten gates. The blades of the grating can move along the arrangement direction of the two sets of blades, thereby enveloping and forming a complex radiation field. The two tungsten gates can reciprocate along their arrangement direction under the action of the tungsten gate drive device to initially adjust the shape of the radiation field, while simultaneously blocking the gap between the two sets of blades to prevent unnecessary dose damage to critical organs and healthy tissues surrounding the target area.

[0004] However, the tungsten gate in the relevant technology is heavy, which causes great wear and tear on the tungsten gate drive device, resulting in low movement accuracy of the tungsten gate and causing unnecessary dose damage to organs at risk and healthy tissues around the target area. Utility Model Content

[0005] The purpose of this invention is to provide a light-shielding component, aperture, and field collimation system, which aims to solve the problem in related technologies where the large weight of the tungsten gate makes it difficult to dynamically follow the movement of the field, resulting in unnecessary dose damage to organs at risk and healthy tissues around the target area.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a light-shielding component, comprising: a light-shielding plate for blocking radiation; the light-shielding plate having a first surface and a second surface facing away from each other; and a substrate disposed on the first surface; wherein the density of the substrate is less than the density of the light-shielding plate.

[0008] The light-shielding component of this invention can be applied to a radiation field collimation system to replace the tungsten gate in related technologies. The light-shielding component includes a light-shielding plate and a substrate, where the light-shielding plate blocks radiation, and the substrate has a lower density than the light-shielding plate. It is understood that the light-shielding plate can be made of a high-density tungsten alloy, while the substrate can be made of a material with a lower density than tungsten alloy. This achieves the shielding requirements while reducing the weight of the tungsten gate, thereby reducing wear on the drive device, improving motion accuracy, and ultimately reducing unnecessary dose damage to organs at risk and healthy tissues surrounding the target area.

[0009] In some embodiments, the light-shielding plate has an incident end and an exit end facing away from each other, the incident end and the exit end being arranged along a first direction parallel to a first surface. The end of the second surface away from the incident end is inclined toward the substrate.

[0010] In some embodiments, the orthographic projection of the second surface onto the reference plane is an arc; wherein the reference plane is parallel to the first direction and perpendicular to the first surface.

[0011] In some embodiments, the second surface includes a plurality of sub-surfaces connected sequentially along a first direction. The end of each sub-surface away from the incident end is inclined toward the substrate, and the inclination angle of one of two adjacent sub-surfaces away from the incident end is greater than the inclination angle of the other.

[0012] In some embodiments, the orthographic projection of at least one sub-face onto the reference plane is an arc; wherein the reference plane is parallel to a first direction and perpendicular to a first surface.

[0013] In some embodiments, the light-shielding member further includes a light-shielding block disposed on the first surface, and a substrate disposed around the light-shielding block. The density of the substrate is less than the density of the light-shielding block, and the light-shielding block is used to block radiation.

[0014] Secondly, the present invention provides a light stop, comprising: two light-shielding members as described in any of the above embodiments; the two light-shielding members are arranged along a second direction, the second direction being perpendicular to a first surface; a driving device connected to the light-shielding members for driving the light-shielding members to move along the second direction; wherein, two light-shielding plates of the two light-shielding members are located between two bases of the two light-shielding members; the light-shielding plates have opposite incident ends and exit ends, the incident ends and exit ends are arranged along a first direction, the first direction being parallel to the first surface; the two incident ends of the two light-shielding plates have the same orientation.

[0015] Thirdly, this utility model provides a field collimation system, including: an aperture in the above embodiment; a grating, the grating including: two blade assemblies, the two blade assemblies being disposed on one side of the aperture in a first direction, and the two blade assemblies being located on the side of the exit end away from the incident end; the two blade assemblies being arranged along a third direction, the third direction being perpendicular to the first direction and the second direction; wherein, in the third direction, there is a gap between the blade ends of the two blade assemblies, and the light-shielding blocks of the two light-shielding members are used to block the gap.

[0016] In some embodiments, the beam collimation system further includes two shielding blocks disposed on the side of the two blade assemblies near the aperture; the two shielding blocks are spaced apart along a third direction, and the two shielding blocks and two light-shielding elements form a light channel; along a first direction, the orthogonal projection of the light channel onto the grating is at least partially located within the gap; wherein the shielding blocks are used to block the rays at the tail ends of the blades of the two blade assemblies.

[0017] In some embodiments, the field collimation system further includes a collimator disposed on the other side of the aperture in the first direction and fixed relative to the aperture and the grating; along the first direction, the collimator has a collimation channel penetrating through the collimator, and the orthographic projection of the gap on the collimator is at least partially located within the collimation channel; wherein, the collimation channel is frustum-shaped; the collimation channel includes an inlet and an outlet disposed opposite to each other, the outlet being located on the side closer to the aperture; the cross-sectional area of ​​the inlet is smaller than the cross-sectional area of ​​the outlet.

[0018] The technical effects of any of the embodiments in the second and third aspects described above can be found in the technical effects of the corresponding embodiments in the first aspect, and will not be repeated here. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a light-shielding component provided in an embodiment of the present utility model;

[0021] Figure 2 for Figure 1 A partial structural diagram of the light-shielding component in the diagram;

[0022] Figure 3 for Figure 2 A partial structural diagram of the light-shielding component from another perspective;

[0023] Figure 4 for Figure 1 Perspective view of the internal structure of the light-shielding component;

[0024] Figure 5 A cross-sectional view of a firing field collimation system provided in an embodiment of this utility model;

[0025] Figure 6 for Figure 5 A cross-sectional view of the field collimation system in another perspective.

[0026] Figure label:

[0027] 100-Field Collimation System;

[0028] 1-Grating; 11-Blade assembly; 111-Blade tip; 112-Blade tail; 12-Drive assembly;

[0029] 2-Aperture; 21-Drive device; 22-Light shield; 221-Light shield plate; 2211-First surface; 2212-Second surface; 2212a-Sub-surface; 2213-Incident end; 2214-Outgoing end; 222-Substrate; 223-Light shield block;

[0030] 3-Shielding block; 31-Optical channel;

[0031] 4-Collider; 41-Collider channel. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that in practical applications, due to limitations in equipment precision or installation errors, achieving absolute parallelism or perpendicularity is difficult. In this invention, the descriptions of "perpendicular," "parallel," or "in the same direction" are not absolute limitations, but rather indicate that a vertical or parallel structural arrangement can be achieved within a preset error range, thus maximizing the technical effect of the defined features and making the corresponding technical solution easy to implement with high feasibility. For example, "perpendicular" includes absolute verticality and near-perpendicularity, where the acceptable deviation range for near-perpendicularity can be, for example, within 5°. "Parallel" includes absolute parallelism and near-parallelism, where the acceptable deviation range for near-parallelism can be, for example, within 5°. "In the same direction" includes absolute same direction and near-same direction, where the acceptable deviation range for near-same direction can be, for example, within 5°.

[0034] In the description of the embodiments of this utility model, "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of the embodiments of this utility model, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In the description of embodiments of this utility model, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0037] In the description of the embodiments of this utility model, the words "exemplary" or "for example" are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this utility model should not be construed as being more preferred or advantageous than other embodiments or design options. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0038] Radiation therapy is a treatment method for tumors that primarily uses high-energy rays to kill or control the growth of cancer cells, thereby achieving the treatment of tumors. Intensity-modulated radiotherapy (IMRT) is an important method of radiation therapy. The field collimation system is a crucial component for conducting IMRT, mainly used to shield a portion of the radiation emitted from the radiation source and adjust the shape of the radiation field to match the shape of the target area. This ensures that the radiation emitted from the radiation source is concentrated on the target area, avoiding unnecessary radiation doses to organs and normal tissues.

[0039] In related technologies, a radiation field collimation system includes a drive device, a grating, and two tungsten gates made of tungsten alloy. The grating has opposing incident and exit sides, and the two tungsten gates are located on the incident side of the grating. The grating includes two sets of blades spaced apart, with the arrangement direction of the two sets of blades perpendicular to the arrangement direction of the two tungsten gates. The blades of the grating can move along the arrangement direction of the two sets of blades, thereby enveloping and forming a complex radiation field. The two tungsten gates can reciprocate along their arrangement direction under the action of the tungsten gate drive device to initially adjust the shape of the radiation field, while simultaneously blocking the gap between the two sets of blades to prevent unnecessary dose damage to critical organs and healthy tissues surrounding the target area.

[0040] However, the tungsten gate in the relevant technology is heavy, which causes great wear and tear on the tungsten gate drive device, resulting in low movement accuracy of the tungsten gate and a relatively large radiation dose to organs at risk and healthy tissues around the target area.

[0041] Based on this, the present invention provides a light shield, a aperture, and a field collimation system to solve the problem in related technologies that the large weight of the tungsten gate makes it difficult to dynamically follow the movement of the field, resulting in unnecessary dose damage to organs at risk and healthy tissues around the target area.

[0042] See Figure 1 and Figure 2 This utility model embodiment provides a light-shielding member 22, which includes a light-shielding plate 221 and a substrate 222. The light-shielding plate 221 has a first surface 2211 and a second surface 2212 facing away from each other, and the substrate 222 is disposed on the first surface 2211 of the light-shielding plate 22. The light-shielding plate 221 is used to block radiation, and the density of the substrate 222 is less than the density of the light-shielding plate 221.

[0043] It should be noted that the light-shielding component 22 in this utility model can be used to replace the tungsten door in related technologies, and the light-shielding plate 221 in the light-shielding component 22 can block part of the rays emitted by the radiation source in order to achieve preliminary adjustment of the shape of the radiation field.

[0044] In this embodiment of the invention, the light shield 221 used to block radiation can be made of high-density tungsten alloy, while the substrate 222 can be made of a material with a density lower than that of tungsten alloy. In this way, the shielding requirements can be met, and the weight of the tungsten gate can be reduced, thereby reducing the wear of the tungsten gate's drive device, improving the motion accuracy, and further reducing unnecessary dose damage to organs at risk and healthy tissues around the target area.

[0045] Understandably, the light shield 221 can be made of high-density materials such as tungsten alloy or depleted uranium, which can better block radiation; while the substrate 222 can be made of metals with relatively low density such as steel, which can reduce the wear of the substrate 222 during movement and thus extend the service life of the light shield 22.

[0046] For example, the light shield 221 is made of tungsten alloy, and the substrate 222 is made of steel. This arrangement not only reduces the amount of precious metal tungsten alloy used, thus lowering costs, but also meets the requirements for radiation shielding, reducing unnecessary dose damage to organs at risk and healthy tissues surrounding the target area.

[0047] In some embodiments, see Figure 3 The light-shielding plate 221 has an incident end 2213 and an exit end 2214 facing each other. The incident end 2213 and the exit end 2214 are arranged along a first direction X, which is parallel to the first surface 2211.

[0048] In this design, the second surface 2212 of the light-shielding plate 221 is tilted towards the substrate 222 at the end furthest from the incident end 2213. This helps to reduce scattering effects, thereby reducing the penumbra width and consequently minimizing unnecessary dose damage to organs at risk and healthy tissues surrounding the target area.

[0049] In some embodiments, see Figure 2 The orthographic projection of the second surface 2212 onto the reference plane is an arc; wherein the reference plane is parallel to the first direction X and perpendicular to the first surface 2211. In this case, the second surface 2212 is an arc surface.

[0050] Understandably, the smoother transition of the curved surface helps to further reduce the penumbra width, thereby reducing unnecessary dose damage to organs at risk and healthy tissues surrounding the target area.

[0051] It should be noted that the orthographic projection of the second surface 2212 onto the reference plane can also be set as a line segment. In this case, the second surface 2212 is a plane segment with an inclination. This setting can also reduce the penumbra width, thereby reducing unnecessary dose damage to organs at risk and healthy tissues around the target area.

[0052] In other embodiments, see Figure 3 The second surface 2212 includes a plurality of sub-surfaces 2212a, which are connected sequentially along the first direction X.

[0053] In this design, the end of sub-surface 2212a furthest from the incident end 2213 is inclined toward the substrate 222, and the inclination angle of one of two adjacent sub-surfaces 2212a furthest from the incident end 2213 is greater than that of the other. That is, the second surface 2212 is composed of multiple sub-surfaces 2212a connected in sequence, and the inclination angle of the multiple sub-surfaces 2212a gradually increases as they move away from the incident end 2213.

[0054] Understandably, in practical applications, as the light-shielding member 22 moves, the bonding area between the radiation beam and the second surface 2212 of the light-shielding plate 221 will change. That is, the bonding area between the radiation beam and the second surface 2212 of the light-shielding plate 221 will be different depending on the position of the light-shielding plate 221. And the penumbra width will be different for different bonding areas.

[0055] In this embodiment of the invention, the second surface 2212 is configured as multiple sub-surfaces 2212a with different tilt angles, enabling the radiation beam to combine with different sub-surfaces 2212a in different bonding regions. This facilitates the design of the tilt angle of each sub-surface 2212a, ensuring that the tilt angle of each sub-surface 2212a matches the corresponding bonding region, thereby achieving more refined processing of the penumbra. Consequently, the penumbra width is reduced in multiple different bonding regions, achieving optimal penumbra across the entire travel range of the light-shielding member 22.

[0056] In some embodiments, see Figure 3 At least one sub-surface 2212a has an orthographic projection onto the reference plane that is an arc. For example, the orthographic projections of multiple sub-surfaces 2212a onto the reference plane can all be set as arcs, or some can be set as arcs and others as line segments. The specific choice can be made according to the actual situation, and this utility model does not impose any specific limitations on this.

[0057] Among them, sub-surface 2212a, whose orthographic projection on the reference plane is an arc, is a segment of arc surface, and sub-surface 2212a, whose orthographic projection on the reference plane is a line segment, is a segment of inclined plane. Both the arc surface and the inclined plane can reduce the penumbra width, thereby reducing unnecessary dose damage to organs at risk and healthy tissues surrounding the target area.

[0058] Since the transition of the arc surface is smoother and the effect of reducing the penumbra width is better, in this embodiment of the utility model, the orthographic projection of the multiple sub-surfaces 2212a in the second surface 2212 onto the reference surface can be set as arcs. At this time, the second surface 2212 is formed by connecting multiple arc surfaces with different tilt angles in sequence.

[0059] In other embodiments, see Figure 3 At least one sub-surface 2212a has its orthographic projection onto the reference plane as a line segment. For example, the orthographic projections of multiple sub-surfaces 2212a onto the reference plane can all be set as line segments, or some can be set as line segments and others as arcs. The specific choice can be made according to the actual situation, and this utility model does not impose any specific limitations on this.

[0060] For example, the orthographic projections of the multiple sub-surfaces 2212a in the second surface 2212 onto the reference plane are all line segments. In this case, the second surface 2212 is formed by connecting multiple planes with different tilt angles in sequence.

[0061] In some embodiments, see Figure 3 and Figure 4 The light-shielding component 22 also includes a light-shielding block 223, which is disposed on the first surface 2211, and the base 222 is disposed around the light-shielding block 223, that is, the light-shielding block 223 is located in the middle of the light-shielding component 22. The light-shielding block 223 is used to block rays.

[0062] In related technologies, the tips of the blades of the grating have gaps, which can lead to leakage of light. However, the light-shielding block 223 in this embodiment can block the gaps at the tips of the blades, thereby blocking the leakage of rays and reducing the harm to healthy tissues.

[0063] To better shield against radiation, the light-shielding block 223 can also be made of high-density materials such as tungsten alloy or depleted uranium.

[0064] See Figure 3 and Figure 5 This utility model embodiment also provides an aperture 2, which includes two light-shielding members 22 as described in any of the above embodiments, and the two light-shielding members 22 are arranged along the second direction Y, which is perpendicular to the first surface 2211.

[0065] Among them, the two light-shielding members 22 have two light-shielding plates 221 located between the two substrates 222, and the two incident ends 2213 of the two light-shielding plates 221 have the same orientation.

[0066] Based on this, the aperture 2 also includes a driving device 21, which is connected to the light-shielding member 22 and is used to drive the light-shielding member 22 to move along the second direction Y.

[0067] To facilitate maintenance of the aperture 2, the drive unit 21 and the detection structure in the aperture 2 can be arranged around the two light-shielding members 22 (for example, on opposite sides of the two light-shielding members 22).

[0068] It should be noted that there can be two drive devices 21, with one drive device 21 corresponding to one light-shielding member 22, and the drive device 21 is used to drive the corresponding light-shielding member 22 to move. In this case, the two light-shielding members 22 can be arranged between the two drive devices 21.

[0069] See Figure 5 and Figure 6 This utility model embodiment also provides a field collimation system 100, which includes a grating 1 and an aperture 2 in any of the above embodiments, with the aperture 2 and the grating 1 being fixed relative to each other.

[0070] The grating 1 includes two blade assemblies 11, which are disposed on one side of the aperture 2 in the first direction X. The two blade assemblies 11 are located on the side of the light-shielding plate 221 in the light-shielding member 22 away from the incident end 2213, that is, the light-shielding plate 221's exit end 2214 faces the two blade assemblies 11.

[0071] It should be noted that the two blade assemblies 11 are arranged along the third direction Z, and there is a gap between the blade tips 111 of the two blade assemblies 11. The two light-shielding blocks 223 of the two light-shielding members 22 are used to block the gap. For example, the orthographic projection of the light-shielding block 223 on the grating 1 is at least partially located within the gap between the blade tips 111 of the two blade assemblies 11.

[0072] In this configuration, the third direction Z is perpendicular to both the first direction X and the second direction Y. That is, the arrangement direction of the two blade assemblies 11 is perpendicular to the arrangement direction of the two light-shielding elements 22.

[0073] In this embodiment of the invention, the driving device 21 can drive the two light-shielding members 22 to move closer or further away from each other to achieve initial adjustment of the radiation field. Then, the two blade assemblies 11 can move relative to each other to achieve fine adjustment of the radiation field so that the shape of the radiation field matches the shape of the target area, so that the radiation emitted by the radiation source can concentrate on irradiating the target area and reduce unnecessary dose damage to organs at risk and healthy tissues around the target area.

[0074] Among them, grating 1 can be a multi-leaf collimator (MLC).

[0075] For example, the blade assembly 11 of the grating 1 includes multiple blades arranged sequentially along the second direction Y, and the multiple blades are movable along the third direction Z to envelop and form a channel that matches the shape of the target area. It should be noted that the second direction Y can be the thickness direction of the blades.

[0076] Based on this, by adjusting the relative positions of multiple blades, the shape of the radiation field can be adjusted so that the shape of the radiation field matches the tumor area.

[0077] To improve the efficiency of adjusting the shape of the firing field, the grating 1 may also include a drive component 12, which is used to drive multiple blades in the blade assembly 11 to move along the third direction Z to achieve automatic adjustment of the firing field shape.

[0078] The number of drive components 12 can be two, with each drive component 12 corresponding to a blade component 11. The drive component 12 is used to drive the movement of multiple blades in the corresponding blade component 11.

[0079] In some embodiments, see Figure 6 The field collimation system 100 also includes two shielding blocks 3, which are disposed on the side of the two blade assemblies 11 near the aperture 2. That is, the two shielding blocks 3 are disposed between the two blade assemblies 11 and the aperture 2.

[0080] Among them, the two shielding blocks 3 are arranged at intervals along the third direction Z, and the two shielding blocks 3 and the two light-shielding members 22 form a light channel 31, through which the radiation beam can be emitted.

[0081] It should be noted that, along the first direction X, the orthogonal projection of the optical channel 31 onto the grating 1 lies at least partially within the gap. In this way, the shielding block 3 can block the rays from the blade tails 112 of the two blade assemblies 11, thereby reducing unnecessary dose damage to organs at risk and healthy tissues surrounding the target area. Simultaneously, it can also reduce the probability of damage to some components in the radiation field collimation system 100 due to radiation exposure, helping to extend the service life of the radiation field collimation system 100.

[0082] In some embodiments, see Figure 6 The field collimation system 100 also includes a collimator 4. Two blade assemblies 11 in the grating 1 are disposed on one side of the aperture 2 in the first direction X, and the collimator 4 is disposed on the other side of the aperture 2 in the first direction X. That is, along the first direction X, the aperture 2 is disposed between the collimator 4 and the grating 1.

[0083] Along the first direction X, the collimator 4 is provided with a collimation channel 41 that penetrates the collimator 4, and the orthogonal projection of the gap between the blade tips 111 of the two blade assemblies 11 on the collimator 4 is at least partially located within the collimation channel 41. In this way, the radiation beam can be irradiated into the gap between the blade tips 111 through the collimation channel 41, and then concentrated to irradiate the target area through the channel formed by the blade envelope.

[0084] It should be noted that the collimation channel 41 includes an entrance and an exit that are arranged opposite to each other. The radiation beam can enter the collimation channel 41 through the entrance and exit through the exit.

[0085] The outlet is located on the side closest to the aperture 2, meaning the outlet faces the aperture 2. In this way, the radiation beam emitted from the collimation channel 41 outlet can be directed toward the aperture 2, and then through the optical channel 31 on the aperture 2 toward the grating 1, and then through the channel formed by the envelope of the blades in the grating 1 to concentrate the irradiation of the target area.

[0086] To match the collimation channel 41 with the conical radiation beam emitted from the radiation source, the cross-sectional area of ​​the inlet of the collimation channel 41 can be set to be smaller than the cross-sectional area of ​​the outlet. For example, the collimation channel 41 can be conical or frustum-shaped, and the specific shape can be selected according to the actual situation.

[0087] For example, the collimation channel 41 is frustum-shaped, such as a quadrangular frustum-shaped collimation channel 41, in which case the inlet and outlet are rectangular openings. The frustum-shaped collimation channel 41 can perform preliminary shaping of the radiation beam emitted from the radiation source to adjust the radiation field into a polygon.

[0088] Understandably, with a traditional circular field of view, the aperture 2 and grating 1 need to occlude the circular boundary, therefore, the sizes of the aperture 2 and grating 1 usually need to be designed to be relatively large. However, with the polygonal field of view in this invention, the aperture 2 and grating 1 do not need to occlude the circular boundary, thus reducing their size. This reduces the amount of material used in the production of the aperture 2 and grating 1, helping to lower costs.

[0089] It should be noted that the collimator 4 can be formed by casting, which helps to reduce the production cost of the collimator 4. However, the collimator 4 can also be formed by other processes, and this utility model does not specifically limit it in this regard.

[0090] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0091] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A light-shielding component, characterized in that, include: A light-shielding plate for blocking radiation; the light-shielding plate has a first surface and a second surface facing away from each other. The substrate is disposed on the first surface; The density of the substrate is less than the density of the light-shielding plate.

2. The light-shielding member according to claim 1, characterized in that, The light-shielding plate has an incident end and an exit end facing each other, the incident end and the exit end are arranged along a first direction, the first direction being parallel to the first surface; The end of the second surface away from the incident end is inclined toward the substrate.

3. The shade of claim 2, wherein, The orthographic projection of the second surface onto the reference plane is an arc; The reference surface is parallel to the first direction and perpendicular to the first surface.

4. The shade of claim 2, wherein, The second surface includes: Multiple sub-faces, wherein the multiple sub-faces are connected sequentially along the first direction; Wherein, the end of the sub-face away from the incident end is inclined toward the substrate, and the inclination angle of the one of two adjacent sub-faces away from the incident end is greater than the inclination angle of the other.

5. The shade of claim 4, wherein, At least one of the sub-surfaces has its orthographic projection onto the reference plane being an arc; The reference surface is parallel to the first direction and perpendicular to the first surface.

6. The shade according to any one of claims 1-5, wherein, The light-shielding component also includes: A light-shielding block is disposed on the first surface, and a substrate is disposed around the light-shielding block; the density of the substrate is less than the density of the light-shielding block, and the light-shielding block is used to block radiation.

7. A light barrier, characterized in that include: The two light-shielding members according to any one of claims 1-6, wherein the two light-shielding members are arranged along a second direction, the second direction being perpendicular to the first surface; A driving device, connected to the light-shielding member, is used to drive the light-shielding member to move along the second direction; The two light-shielding plates of the two light-shielding members are located between the two bases of the two light-shielding members; the light-shielding plates have opposite incident ends and exit ends, the incident ends and the exit ends are arranged along a first direction, the first direction being parallel to the first surface; the two incident ends of the two light-shielding plates have the same orientation.

8. A field collimation system, characterized in that, include: The aperture as described in claim 7; A grating, the grating comprising: Two blade assemblies are disposed on one side of the aperture in the first direction, and the two blade assemblies are located on the side of the exit end opposite to the incident end; the two blade assemblies are arranged along a third direction, which is perpendicular to both the first direction and the second direction; In the third direction, there is a gap between the blade ends of the two blade assemblies, and the light-shielding blocks of the two light-shielding members are used to block the gap.

9. The field collimation system according to claim 8, characterized in that, The field collimation system also includes: Two shielding blocks are disposed on the side of the two blade assemblies near the aperture; the two shielding blocks are spaced apart along the third direction, and the two shielding blocks and the two light-shielding members form a light channel; along the first direction, the orthogonal projection of the light channel on the grating is at least partially located within the gap; The shielding block is used to block the rays at the tail of the blades of the two blade assemblies.

10. The field collimation system according to claim 9, characterized in that, The field collimation system also includes: A collimator is disposed on the other side of the aperture in the first direction and is fixed relative to the aperture and the grating; Along the first direction, the collimator is provided with a collimation channel that penetrates the collimator, and the orthographic projection of the gap on the collimator is at least partially located within the collimation channel; The collimation channel is frustum-shaped; the collimation channel includes an inlet and an outlet arranged opposite each other, with the outlet located on the side closer to the aperture; the cross-sectional area of ​​the inlet is smaller than the cross-sectional area of ​​the outlet.

Images