Multi-leaf grating and radiotherapy equipment

Abstract

The embodiment of the invention provides a multi-leaf grating and radiotherapy equipment, and the multi-leaf grating comprises a blade which is used for shielding a radiation beam; the driving mechanism is connected with the blades, and the driving mechanism is used for driving the blades to move to form a radiation field; and each blade head mechanism is mounted on one blade and is used for adjusting the radiation field.

Description

Technical Field

[0001] The present specification relates to the technical field of medical equipment, and in particular to a multi-leaf grating and radiotherapy equipment. Background Art

[0002] Radiotherapy is one of the important methods for treating tumors. Precision radiotherapy is beneficial to improving the treatment effect and reducing the harm to patients during the treatment process. Among them, the Multi-Leaf Collimator (MLC) is a key core component for carrying out precision radiotherapy, implementing conformal and intensity-modulated therapy, and improving the treatment effect. The multi-leaf collimator with high resolution can help doctors determine the target area for treatment more accurately and reduce damage to surrounding healthy tissues during radiotherapy, which helps to improve the effect of treatment and reduce the impact of side effects. However, due to the limitations of the transmission structure of the multi-leaf collimator, the thickness of its leaves cannot be made too thin, which leads to the fact that the resolution of the multi-leaf collimator is often low.

[0003] Therefore, it is necessary to provide a multi-leaf grating and radiotherapy equipment with high resolution. Summary of the invention

[0004] One or more embodiments of the present specification provide a multi-leaf grating, which includes: blades, which are used to shield radiation beams; a driving mechanism, which is connected to the blades and is used to drive the blades to move to form a radiation field; and a blade head mechanism, each of which is installed on one of the blades and is used to adjust the radiation field.

[0005] In some embodiments, the blade head mechanism includes: a blade head, the thickness of the blade head is smaller than the thickness of its corresponding blade; a micro-drive mechanism, the micro-drive mechanism is arranged between the blade head and the blade, and the micro-drive mechanism is used to drive the blade head and its corresponding blade to move.

[0006] In some embodiments, each of the blades corresponds to at least two blade heads.

[0007] In some embodiments, the blade includes a first end close to the center of the field and a second end away from the center of the field, the blade head mechanism is installed at the first end, and the drive mechanism is installed at the second end.

[0008] In some embodiments, the first end includes a first recessed portion, a first motion guide groove is provided in the first recessed portion, the blade head includes a first protrusion matching the first recessed portion, and the first motion guide groove is used to install the first protrusion and limit the movement direction of the blade head.

[0009] In some embodiments, the first end further includes an extension portion closer to the center of the field relative to the first recessed portion, the blade head further includes an abutment portion closer to the center of the field relative to the first protrusion, and the micro-drive mechanism is mounted on the extension portion and connected to the abutment portion to drive the blade head to move relative to the blade.

[0010] In some embodiments, each of the blades includes a third end close to the radiation source and a fourth end away from the radiation source, and each of the blade head mechanisms is mounted on the fourth end of its corresponding blade.

[0011] In some embodiments, a hanging portion is provided on the fourth end, the hanging portion includes a second recessed portion, a second motion guide groove is provided in the second recessed portion, the blade head includes a second protrusion matching the second recessed portion, and the second motion guide groove is used to install the second protrusion and limit the movement direction of the blade head.

[0012] In some embodiments, the micro-driving mechanism is mounted on the bottom surface of the second recess and connected to the second protrusion of the blade head to drive the blade head to move relative to the blade.

[0013] In some embodiments, the micro-drive mechanism includes a base, a control membrane mounted on the base, and a control power supply, wherein the control membrane is connected to the blade head, and the control power supply is configured to apply a voltage to the control membrane to cause the control membrane to produce a target deformation, and the target deformation of the control membrane drives the blade head to move.

[0014] In some embodiments, the control membrane includes a plurality of control sub-membranes arranged in parallel, and the control power source is configured to apply a voltage to each of the control sub-membranes respectively, so as to make the plurality of control sub-membranes move in combination to form the target deformation.

[0015] One or more embodiments of the present specification provide a radiotherapy device, comprising the multi-leaf collimator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] This specification will be further described in the form of exemplary embodiments, which will be described in detail by the accompanying drawings. These embodiments are not restrictive, and in these embodiments, the same number represents the same structure, wherein:

[0017] Figure 1A is an exemplary structural diagram of a multi-leaf collimator according to some embodiments of this specification;

[0018] Figure 1B yes Figure 1A A top view of a blade portion of a multileaf grating shown in FIG.

[0019] Figure 2 is an exemplary partial structural diagram of a multi-leaf grating according to some embodiments of the present specification;

[0020] Figure 3 is an exemplary structural diagram of a blade according to some embodiments of this specification;

[0021] Figure 4 According to some embodiments of this specification Figure 3 An exemplary structural diagram after the area A in FIG. is enlarged;

[0022] Figure 5 is an exemplary structural diagram of another multi-leaf grating according to some embodiments of this specification;

[0023] Figure 6 is an exemplary structural diagram of a micro-drive mechanism according to some embodiments of this specification;

[0024] Figure 7 is an exemplary structural diagram of a micro-drive mechanism according to some embodiments of this specification;

[0025] Figure 8 is an exemplary structural diagram of a double-layer multi-leaf grating according to some embodiments of the present specification.

[0026] Among them, the reference numerals are: 100-multi-leaf grating; 110-blade; 110a-blade; d1-thickness of blade 110a; 111-first end; 111-1-first recessed portion; 111-1-1-first motion guide groove; 111-2-extension portion; 112-second end; 113-third end; 114-fourth end; 120-driving mechanism; 121-driving assembly; 122-transmission assembly; 123-connecting assembly; 130-blade head mechanism; 131-blade head; 131a-blade head; d2-thickness of blade head 131a; d3-total thickness of multiple blade heads corresponding to blade 110a; 131 -1-first protrusion; 131-2-abutment portion; 132-micro-drive mechanism; 132-1-base; 132-2-control membrane; 132-2-1-first control sub-membrane; 132-2-2-second control sub-membrane; 132-2-3-third control sub-membrane; 132-2-4-fourth control sub-membrane; 132-3-control power supply; 500-multi-leaf grating; 510-suspension portion; 511-second recessed portion; 520-blade head mechanism; 521-blade head; 521-1-second protrusion; 522-micro-drive mechanism; 800-double-layer multi-leaf grating; 810-upper multi-leaf grating; 820-lower multi-leaf grating. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of this specification. For ordinary technicians in this field, this specification can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0028] It should be understood that the "system", "device", "unit" and / or "module" used herein are a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

[0029] As shown in this specification and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0030] Flowcharts are used in this specification to illustrate the operations performed by the system according to the embodiments of this specification. It should be understood that the preceding or following operations are not necessarily performed precisely in order. Instead, the steps may be processed in reverse order or simultaneously. At the same time, other operations may also be added to these processes, or one or more operations may be removed from these processes.

[0031] A multileaf collimator, also known as a multileaf collimator, is used to adjust the shape and size of the radiation field formed by the radiation of the radiation source. A multileaf collimator usually includes multiple pairs of blades, which are divided into two groups and arranged relatively to each other. During radiotherapy, each leaf can move independently along the direction of extension of the leaf length, thereby forming a closed radiation field to prevent healthy tissue around the tumor from being irradiated by radiation. However, due to the limitations of the transmission structure of the multileaf collimator, it is impossible to make the thickness of its leaves too thin, which leads to the fact that the resolution of the multileaf collimator is often low and the radiation field of treatment cannot be accurately determined. Some embodiments of the present specification provide a multileaf collimator and a double-layer multileaf collimator, which have high resolution and can accurately determine the radiation field of radiotherapy, which is beneficial to improving the treatment effect and reducing harm to patients during treatment.

[0032] Figure 1A is an exemplary structural diagram of a multi-leaf collimator 100 according to some embodiments of the present specification. Figure 1BFIG. 1 is a top view of the leaf portion of the multileaf grating 100. For illustrative purposes, the figure only shows the structure of the multileaf grating 100 on one side of the area to be treated. It should be understood that the other side of the area to be treated is also provided with a structure similar to that of the multileaf grating 100. Figure 1A and Figure 1B Similar structures. The structures on both sides of the area to be treated cooperate to form a radiation field.

[0033] like Figure 1A and 1B As shown, the multi-leaf collimator 100 may include a plurality of blades 110 , a plurality of driving mechanisms 120 , and at least one blade head mechanism 130 .

[0034] The blade 110 is a component for roughly adjusting the size and shape of the radiation field. A plurality of blades 110 are used to shield the radiation beam. A plurality of blades 110 are arranged in parallel along a first direction, and each blade 110 is extended along a second direction. The first direction refers to the direction in which the plurality of blades are arranged in parallel, and the second direction refers to the extension direction of the blade, and the second direction is perpendicular to the first direction. In some embodiments, the first direction is parallel to the thickness direction of the blade 110, and the second direction is parallel to the length direction and the movement direction of the blade 110. Each blade 110 can move along the second direction to approach and move away from the center of the field.

[0035] In some embodiments, each blade 110 includes a first end close to the center of the field and a second end away from the center of the field in the second direction, and includes a third end close to the radiation source and a fourth end away from the radiation source in the third direction. The third direction is perpendicular to the plane formed by the first direction and the second direction, and parallel to the width direction of the blade 110. In some embodiments, the third direction is parallel to the line connecting the radiation source and the center of the field.

[0036] Just as an example, Figure 2 FIG. 1 is an exemplary partial structural diagram of a multi-leaf grating according to some embodiments of the present specification. Figure 2 As shown, the blade 110 includes a first end 111 close to the center of the field, a second end 112 far from the center of the field, a third end 113 close to the radiation source, and a fourth end 114 far from the radiation source.

[0037] The driving mechanism 120 is a component for driving the blades 110 to move to form a radiation field. In some embodiments, each driving mechanism 120 is connected to a blade 110 and is used to drive the blade 110 to move to form a radiation field, for example, to move along the second direction to approach or move away from the center of the radiation field. The driving mechanism 120 is connected to the blade 110, and there are many ways of connection, for example, welding, nut connection, riveting, etc.

[0038] In some embodiments, the drive mechanism 120 may be composed of a drive component (e.g., a motor), a transmission component (e.g., a transmission screw) and a connection component (e.g., a nut). Figure 2 As shown, the driving mechanism 120 may be composed of a driving component 121 , a transmission component 122 and a connecting component 123 , and the connecting component 123 is connected to the blade 110 .

[0039] The blade head mechanism 130 is a component for accurately adjusting the size and shape of the radiation field. Each blade head mechanism 130 is mounted on a blade 110. Figure 2 As shown, the blade head mechanism 130 can be mounted on the first end 111 of its corresponding blade 110. In some embodiments, the blade head mechanism 130 can be mounted on an end of the blade 110 away from the radiation source, for example, the fourth end 114. In some embodiments, one blade 110 has two corresponding blade head mechanisms 130, one blade head mechanism 130 is mounted on the first end 111 of the blade 110, and the other blade head mechanism 130 is mounted on the fourth end 114 of the blade 110.

[0040] In some embodiments, Figure 2 As shown, each blade head mechanism 130 includes at least one blade head 131 and a micro-driving mechanism 132 .

[0041] The blade head 131 can be used to precisely adjust the size and shape of the radiation field. In some embodiments, the blade head mechanism 130 may include a blade head 131. The thickness of the blade head 131 is less than the thickness of the corresponding blade 110. It is understood that when there is only one blade head 131 and it is disposed on the first end 111 of the blade 110, in order to avoid missing lines, the thickness of the blade head 131 can be equal to the thickness of the blade 110.

[0042] In some embodiments, the blade head mechanism 130 may include a plurality of blade heads 131. The plurality of blade heads 131 are arranged in parallel along the first direction. In some embodiments, each of the blades 110 corresponds to at least two blade heads 131. In some embodiments, the thickness of each blade head 131 in the plurality of blade heads is less than the thickness of the corresponding blade 110, and the total thickness of the plurality of blade heads 131 corresponding to the blade 110 may be equal to or substantially equal to the thickness of the blade 110. For example, Figure 1B As shown, the thickness d2 of the blade head 131a is less than the thickness d1 of the blade 110a, and the total thickness d3 of the plurality of blade heads corresponding to the blade 110a is substantially equal to the thickness d1 of the blade 110a.

[0043] The micro-drive mechanism 132 is a component for driving the blade head 131 to move. The micro-drive mechanism 132 is disposed between the blade head 131 and the blade 110. The micro-drive mechanism 132 is connected to the plurality of blade heads 131 and is used to drive the plurality of blade heads 131 to move relative to the blade 110, for example, to move along the second direction. There are many ways to connect the micro-drive mechanism 132 to the plurality of blade heads 131, for example, welding, bonding, etc.

[0044] When used, the plurality of drive mechanisms 120 can respectively drive the plurality of blades 110 arranged in parallel along the first direction to move the blades 110 by the same or different distances along the second direction to form an initial radiation field. When the blades 110 move, they will drive the corresponding blade head mechanism 130 to move along the second direction. Then, the micro-drive mechanism 132 can drive at least one blade head 131 to move the same or different distances relative to the blades 110 along the second direction to adjust the initial radiation field and finally form a target radiation field. In some embodiments, since the thickness of the blade head 131 is smaller than that of the blade 110, when the micro-drive mechanism drives the blade head 131, the movement of each blade head 131 can be adjusted more finely, so that the radiation field formed by the blade head 131 is closer to the shape of the treatment area; in some embodiments, the thickness of the blade head 131 is the same as the thickness of the blade 110. At this time, the micro-drive mechanism can also drive and adjust the blade head 131 to make the blade head 131 closer to the tumor (that is, closer to the treatment area, closer to the treatment area), so as to achieve better radiation field conformality. Therefore, setting the blade head 131 can obtain a multi-leaf grating with higher resolution, so as to more accurately determine the size and shape of the radiation field, reduce damage to surrounding healthy tissues during radiotherapy, and help improve the treatment effect and reduce the impact of side effects. For more information about the micro-drive mechanism, please refer to Figure 6-Figure 7 and its related description.

[0045] Figure 3 is an exemplary structural diagram of a blade 110 according to some embodiments of the present specification. Figure 2 and Figure 3 The first end 111 of the blade 110 includes a first recessed portion 111 - 1 and an extended portion 111 - 2 closer to the center of the field of view than the first recessed portion 111 - 1 .

[0046] The first recessed portion 111-1 is a structure for matching and installing with the blade head 131. In some embodiments, the plurality of blade heads 131 of the blade head mechanism 130 include a first protruding portion 131-1 matching with the first recessed portion 111-1. Figure 2 As shown, the first recessed portion 111 - 1 of the blade 110 may match the first protruding portions 131 - 1 of the plurality of blade heads 131 , so that the plurality of blade heads 131 may be mounted on the blade 110 .

[0047] In some embodiments, a first movement guide groove 111-1-1 extending along the second direction is provided in the first recessed portion 111-1. Figure 4 According to some embodiments of this specification Figure 3 An exemplary structural diagram after the area A in FIG. Figure 4 As shown, the first motion guide groove 111-1-1 includes a plurality of motion guide grooves extending along the second direction. The number of the motion guide grooves is the same as the number of the plurality of blade heads 131 corresponding to the blade 110. The first motion guide groove 111-1-1 is used to install the first protrusion 131-1 and limit the movement direction of the plurality of blade heads 131. For example, Figure 2 As shown, the first protrusion 131-1 of each blade head 131 matches with the corresponding motion guide groove in the first motion guide groove 111-1-1, and the first motion guide groove 111-1-1 restricts the plurality of blade heads 131 to only approach or move away from the center of the field along the second direction.

[0048] It should be noted that Figure 2 The matching connection method between the first recessed portion 111-1 of the blade 110 and the first protruding portion 131-1 of the plurality of blade heads 131 is only for illustration, and the first recessed portion 111-1 can also be matched and connected with the first protruding portion 131-1 in other ways, for example, a pulley groove connection.

[0049] The extension portion 111-2 is a structure for mounting the micro-driving mechanism 132. Figure 2 As shown, the micro-driving mechanism 132 is mounted on the extension portion 111 - 2 . The micro-driving mechanism 132 and the extension portion 111 - 2 may be connected in a variety of ways, such as nut connection, welding, and the like.

[0050] It should be noted that Figure 2 The installation position of the micro-driving mechanism 132 in the figure is only for illustration and may be different from the actual installation position of the micro-driving mechanism 132. The actual installation position of the micro-driving mechanism 132 can be set as required. For example, the micro-driving mechanism 132 can also be installed on the concave bottom surface of the first concave portion 111-1.

[0051] In some embodiments, Figure 2 As shown, the plurality of blade heads 131 further include an abutment portion 131-2 that is closer to the center of the field of view than the first protrusion 131-1. The micro-driving mechanism 132 can be connected to the abutment portion 131-2 to drive the plurality of blade heads 131 to move along the second direction relative to the blade 110. There are many ways to connect the micro-driving mechanism 132 and the abutment portion 131-2, such as bonding, welding, etc.

[0052] It should be noted that Figure 2The shapes of the blade 110 and the blade head 131 are only for illustration and may be different from the actual shapes of the blade 110 and the blade head 131. The actual shapes of the blade 110 and the blade head 131 may be set as needed. For example, the blade 110 may not include the extension portion 111-2, the blade head 131 may not include the abutment portion 131-2, and the micro-drive mechanism 132 may be installed on the concave bottom surface of the first concave portion 111-1 of the blade 110, and connected to the first protrusion 131-1 of the blade head 131.

[0053] Figure 5 FIG. 5 is an exemplary structural diagram of another multi-leaf grating 500 according to some embodiments of the present specification. Figure 5 As shown, each blade head mechanism 520 of the multi-leaf collimator 500 can be mounted on the fourth end 114 of its corresponding blade 110. In some embodiments, the blade head mechanism 520 can be connected to the fourth end 114 of its corresponding blade 110 in various ways, such as welding, bonding, etc.

[0054] In some embodiments, a hanging portion 510 is disposed on the fourth end 114 of the blade 110 .

[0055] The suspension portion 510 is a structure for mounting the blade head mechanism 520. In some embodiments, as Figure 5 As shown, the suspension portion 510 includes a second recessed portion 511. The second recessed portion 511 is used to match and install with the blade head 521 of the blade head mechanism 520. In some embodiments, the plurality of blade heads 521 of the blade head mechanism 520 include a second protrusion 521-1 that matches the second recessed portion 511. Figure 5 As shown, the second recessed portion 511 of the hanging portion 510 may match the second protruding portions 521 - 1 of the plurality of blade heads 521 , so that the plurality of blade heads 521 may be mounted on the hanging portion 510 .

[0056] In some embodiments, a second motion guide groove (not shown) extending along the second direction is provided in the second recessed portion 511. The second motion guide groove includes a plurality of motion guide grooves extending along the second direction, the number of which is the same as the number of the plurality of blade heads 521 corresponding to the blade 110. The second motion guide groove is used to install the second protrusions 521-1 of the plurality of blade heads 521 and limit the movement direction of the plurality of blade heads 521. For example only, Figure 5 As shown, the second protrusion 521 - 1 of each blade head 521 matches with the corresponding motion guide groove in the second motion guide groove, and the second motion guide groove restricts the plurality of blade heads 521 to only approach or move away from the center of the field along the second direction.

[0057] It should be noted that Figure 5The matching connection method between the second recessed portion 511 of the hanging portion 510 and the second protruding portions 521-1 of the plurality of blade heads 521 is only for illustration, and the second recessed portion 511 can also be matched and connected with the second protruding portion 521-1 in other ways, for example, a pulley groove connection.

[0058] In some embodiments, the micro-driving mechanism 522 is mounted on the concave bottom surface of the second concave portion 511. There are many ways to connect the micro-driving mechanism 522 and the concave bottom surface, such as nut connection, welding, etc.

[0059] In some embodiments, the micro-drive mechanism 522 is connected to the second protrusion 521-1 of the plurality of blade heads 521 to drive the plurality of blade heads 521 to move along the second direction relative to the blade 110. There are many ways to connect the micro-drive mechanism 522 and the plurality of blade heads 521, such as bonding, welding, etc. In some embodiments, the structure of the micro-drive mechanism 522 is similar to that of the micro-drive mechanism 132, and a specific description can be referred to Figure 6 and Figure 7 .

[0060] It should be noted that Figure 5 The shapes of the hanging portion 510 and the blade head 521 are only for illustration, and may be different from the actual shapes of the hanging portion 510 and the blade head 521. The actual shapes of the hanging portion 510 and the blade head 521 can be set as needed.

[0061] The application of the multileaf collimator 500 is similar to that of the multileaf collimator 100. The blade 110, driven by the driving mechanism, drives the blade head mechanism 520 to move toward the center of the radiation field to form an initial radiation field, and the blade head 521, driven by the micro-driving mechanism 522, further moves relative to the blade 110 in a second direction to form a target radiation field.

[0062] Figure 6 1 is an exemplary structural diagram of the micro-drive mechanism 132 according to some embodiments of this specification. Figure 6 As shown, the micro-driving mechanism 132 includes a base 132 - 1 , a control membrane 132 - 2 and a control power source 132 - 3 .

[0063] The base 132-1 is used to support and install other components in the micro-driving mechanism 132. For example, the control membrane 132-2 and the control power supply 132-3 can be installed on the base 132-1, and there are many ways to install them, such as bonding, welding, etc.

[0064] The control power supply 132-3 is configured to apply a voltage to the control film 132-2 so that the control film 132-2 generates a target deformation. The target deformation of the control film 132-2 drives the blade head 131 to move in the second direction. The target deformation refers to the deformation required by the control film in radiotherapy, which can drive the blade head 131 to generate the required movement in the second direction, thereby forming an ideal target radiation field. For example, the target deformation includes the bending direction and degree of bending of the control film in radiotherapy.

[0065] The control film 132 - 2 is a structure for driving the plurality of blade heads to move and is connected to the plurality of blade heads 131 .

[0066] In some embodiments, the control membrane 132-2 can be made of artificial muscle materials, such as ion-exchange polymer metal composite (IPMC). Since ion-exchange polymer metal composite has the advantages of large deformation degree, low noise during deformation, good material flexibility, light weight, low driving voltage, and rapid and sensitive response, the prepared control membrane can quickly respond to the voltage applied by the control power supply to achieve the target deformation.

[0067] In some embodiments, the bending direction of the control film 132-2 can be changed by changing the positive and negative poles of the voltage input by the control power supply 132-3 to the control film 132-2. In some embodiments, the bending degree of the control film 132-2 can be controlled by inputting voltages of different magnitudes to the control film 132-2 through the control power supply 132-3.

[0068] In some embodiments, other driving mechanisms may be used to drive the movement of the multiple blade heads, such as controllable flexible actuators such as responsive hydrogels, shape memory polymers, electroactive polymers, and piezoelectric ceramics.

[0069] In some embodiments, the control membrane 132-2 includes a plurality of control sub-membranes arranged in parallel along a first direction. The control power supply 132-3 is configured to apply a voltage to each control sub-membrane respectively so that the plurality of control sub-membranes move in combination to form a target deformation. Adjacent control sub-membranes may be interconnected (such as by welding or bonding). When the control sub-membranes are controlled separately, different control sub-membranes may produce different movements. The combined movement of the plurality of control sub-membranes may cause the entire control mold 132 to produce a target deformation, thereby causing the blade head 131 to move to form a target radiation field.

[0070] Figure 7 1 is an exemplary structural diagram of the micro-drive mechanism 132 according to some embodiments of this specification. Figure 7As shown, the control film 132-2 includes a first control sub-membrane 132-2-1, a second control sub-membrane 132-2-2, a third control sub-membrane 132-2-3 and a fourth control sub-membrane 132-2-4 arranged in parallel along a first direction. The control power source 132-3 is respectively connected to the first control sub-membrane 132-2-1, the second control sub-membrane 132-2-2, the third control sub-membrane 132-2-3 and the fourth control sub-membrane 132-2-4 and applies voltage to make the combined deformation of these control sub-membranes form a target deformation.

[0071] Some embodiments of the present specification provide a double-layer multi-leaf grating, which includes an upper multi-leaf grating and a lower multi-leaf grating arranged in parallel along a third direction, and at least one of the upper multi-leaf grating and the lower multi-leaf grating is the multi-leaf grating described in any one of the above embodiments. Just as an example, Figure 8 is an exemplary structural diagram of a double-layer multi-leaf grating 800 according to some embodiments of this specification. Figure 8 As shown, the double-layer multileaf grating 800 includes an upper multileaf grating 810 and a lower multileaf grating 820 arranged in parallel along a third direction. The upper multileaf grating 810 is closer to the radiation source than the lower multileaf grating 820. When used, the upper multileaf grating 810 and the lower multileaf grating 820 can form a target radiation field respectively. The upper multileaf grating 810 is used to preliminarily filter the rays emitted by the radiation source, and the lower multileaf grating 810 can further filter the rays filtered by the upper multileaf grating 810, so as to make the accuracy of the rays directed to the area to be treated higher.

[0072] It should be noted that Figure 8 The double-layer multi-leaf grating 800 shown in FIG. 1 is for illustration only. One or more of the upper and lower multi-leaf gratings in the double-layer multi-leaf grating may also be Figure 5 The multi-leaf grating shown in . By arranging multiple multi-leaf gratings in parallel in the third direction, it is beneficial to further improve the resolution of the multi-leaf grating, thereby improving the effect of radiotherapy and reducing side effects on patients.

[0073] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of this specification. Although not explicitly stated here, those skilled in the art may make various modifications, improvements and corrections to this specification. Such modifications, improvements and corrections are suggested in this specification, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of this specification.

[0074] At the same time, this specification uses specific words to describe the embodiments of this specification. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of this specification. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of this specification can be appropriately combined.

[0075] In addition, unless explicitly stated in the claims, the order of the processing elements and sequences described in this specification, the use of alphanumeric characters, or the use of other names are not intended to limit the order of the processes and methods of this specification. Although the above disclosure discusses some invention embodiments that are currently considered useful through various examples, it should be understood that such details are only for illustrative purposes, and the attached claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that are consistent with the essence and scope of the embodiments of this specification. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only by software solutions, such as installing the described system on an existing server or mobile device.

[0076] Similarly, it should be noted that in order to simplify the description disclosed in this specification and thus help understand one or more embodiments of the invention, in the above description of the embodiments of this specification, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the subject matter of this specification are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0077] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of this specification are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0078] Each patent, patent application, patent application publication, and other materials, such as articles, books, specifications, publications, documents, etc., cited in this specification are hereby incorporated by reference in their entirety. Except for application history documents that are inconsistent with or conflicting with the contents of this specification, documents that limit the broadest scope of the claims of this specification (currently or later attached to this specification) are also excluded. It should be noted that if the descriptions, definitions, and / or use of terms in the materials attached to this specification are inconsistent or conflicting with the contents described in this specification, the descriptions, definitions, and / or use of terms in this specification shall prevail.

[0079] Finally, it should be understood that the embodiments described in this specification are only used to illustrate the principles of the embodiments of this specification. Other variations may also fall within the scope of this specification. Therefore, as an example and not a limitation, alternative configurations of the embodiments of this specification may be considered consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the embodiments explicitly introduced and described in this specification.

Claims

1. A multi-leaf grating, characterized in that: The multileaf collimator comprises: A blade (110), wherein the blade (110) is used to shield the radiation beam; a driving mechanism (120), the driving mechanism (120) being connected to the blade (110), and the driving mechanism (120) being used to drive the blade (110) to move to form a radiation field; A blade head mechanism (130), each of the blade head mechanisms (130) is mounted on one of the blades (110) and is used to adjust the radiation field.

2. The multileaf collimator according to claim 1, characterized in that: The blade head mechanism (130) comprises: A blade head (131), wherein the thickness of the blade head (131) is smaller than the thickness of the corresponding blade (110); A micro-drive mechanism (132) is provided between the blade head (131) and the blade (110) corresponding thereto, and is used to drive the blade head (131) to move relative to the blade (110) corresponding thereto.

3. The multileaf collimator according to claim 2, characterized in that: Each of the blades (110) corresponds to at least two blade heads (131).

4. The multileaf collimator according to claim 2, characterized in that: The blade (110) comprises a first end (111) close to the center of the field and a second end (112) away from the center of the field, the blade head mechanism (130) is installed at the first end (111), and the driving mechanism (120) is installed at the second end (112).

5. The multileaf collimator according to claim 4, characterized in that: The first end (111) comprises a first recessed portion (111-1), and a first movement guide groove (111-1-1) is provided in the first recessed portion (111-1). The blade head (131) comprises a first protrusion (131-1) matching the first recess (111-1), The first movement guide groove (111-1-1) is used to install the first protrusion (131-1) and limit the movement direction of the blade head (131).

6. The multileaf collimator according to claim 5, characterized in that: The first end (111) further comprises an extension portion (111-2) closer to the center of the radiation field than the first recessed portion (111-1). The blade head (131) further comprises an abutment portion (131-2) closer to the center of the field of view than the first protrusion (131-1). The micro-driving mechanism (132) is mounted on the extending portion (111-2) and connected to the abutting portion (131-2) to drive the blade head (131) to move relative to the blade (110).

7. The multileaf collimator according to claim 1, characterized in that: Each of the blades (110) comprises a third end (113) close to the radiation source and a fourth end (114) far from the radiation source, and the blade head mechanism (130) is mounted on the fourth end (114) of the corresponding blade (110).

8. The multileaf collimator according to claim 7, characterized in that: The fourth end (114) is provided with a hanging portion (510), the hanging portion (510) comprises a second recessed portion (511), and a second movement guide groove is provided in the second recessed portion (511). The blade head (131) comprises a second protrusion (521-1) matching the second recess (511), The second movement guide groove is used to install the second protrusion (521-1) and limit the movement direction of the blade head (131).

9. The multileaf collimator according to claim 8, characterized in that: The micro-drive mechanism (132) is mounted on the recessed bottom surface of the second recessed portion (511) and is connected to the second protruding portion (521-1) of the blade head (131) to drive the blade head (131) to move relative to the blade (110).

10. The multileaf collimator according to claim 1, characterized in that: The micro-driving mechanism (132) comprises a base (132-1), a control membrane (132-2) mounted on the base (132-1), and a control power source (132-3). The control membrane (132-2) is connected to the blade head (131). The control power source (132-3) is configured to apply a voltage to the control film (132-2) so that the control film (132-2) generates a target deformation, and the target deformation of the control film (132-2) drives the blade head (131) to move.

11. The multileaf collimator according to claim 10, characterized in that: The control membrane (132-2) includes a plurality of control sub-membranes arranged in parallel, and the control power source is configured to apply a voltage to each of the control sub-membranes respectively, so as to make the plurality of control sub-membranes move in combination to form the target deformation.

12. A radiotherapy device, characterized in that: Comprising the multi-leaf collimator as claimed in any one of claims 1 to 11.

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