CN219517600U

CN219517600U - Collimation system and treatment head

Info

Publication number: CN219517600U
Application number: CN202223590417.7U
Authority: CN
Inventors: 郭召
Original assignee: Beijing Dayitonghui Innovation Technology Co ltd; Our United Corp
Current assignee: Dayi Innovation Factory Beijing Technology Co ltd; Our United Corp
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-08-15
Anticipated expiration: 2032-12-29

Abstract

The utility model relates to the field of radiation equipment, and provides a collimation system and a treatment head. The collimation system comprises: the diaphragm assembly comprises a mounting seat, and a first diaphragm group and a second diaphragm group which are positioned in the mounting seat, wherein the first diaphragm group and the second diaphragm group are configured to be sequentially arranged along the beam outlet direction of the radiation source; the diaphragm bodies in the first diaphragm group can move linearly along a first direction, and the diaphragm bodies in the second diaphragm group can move linearly along a second direction; the positioning interface plate penetrates through the middle of the positioning interface plate to form a beam channel, and the positioning interface plate is detachably connected with the mounting seat; and the multi-leaf grating assembly is detachably connected with the positioning interface plate. The diaphragm main body in the collimation system has strong dynamic response capability, and the collimation system is easy to maintain.

Description

Collimation system and treatment head

Technical Field

The utility model relates to the field of radiation equipment, in particular to a collimation system and a treatment head.

Background

Medical linacs are an important device for delivering radiation therapy. The collimation system in the medical linac adjusts the beam (e.g., X-rays) from the source to form the desired complex field.

The collimation system mainly comprises two structures of an independent diaphragm and a multi-leaf grating. However, the traditional diaphragm component moves in an arc shape, and is limited by the support piece and the driving structure, so that the movement speed of the diaphragm component is difficult to improve, the diaphragm component can not quickly field along with the grating blades, the treatment efficiency is reduced, and the dosage born by normal tissues around a target area is increased. Therefore, the diaphragm assembly is difficult to meet the requirement of dynamically following the movement speed of the multi-leaf collimator assembly. In addition, the connecting structure between the diaphragm component and the multi-leaf grating component is complex, and the diaphragm component and the multi-leaf grating component are not easy to be quickly disassembled and replaced. Once a fault occurs, a long downtime is required to repair the alignment system.

Disclosure of Invention

To overcome the deficiencies in the prior art, the present utility model provides a collimation system comprising:

the diaphragm assembly comprises a mounting seat, and a first diaphragm group and a second diaphragm group which are positioned in the mounting seat, wherein the first diaphragm group and the second diaphragm group are configured to be sequentially arranged along the beam outlet direction of the radiation source; the diaphragm bodies in the first diaphragm group can move linearly along a first direction, the diaphragm bodies in the second diaphragm group can move linearly along a second direction, and the first direction is perpendicular to the second direction;

the positioning interface plate penetrates through the middle of the positioning interface plate to form a beam channel, and the positioning interface plate is detachably connected with the mounting seat;

the multi-blade grating assembly is detachably connected with the positioning interface board and comprises a plurality of blades which are oppositely arranged, and the blades can move along the first direction or the second direction.

In one possible embodiment, the first direction is an X-axis direction in an IEC coordinate system, and the second direction is a Y-axis direction in the IEC coordinate system.

In one possible implementation, the positioning interface board and the mounting seat are arranged in one of the following ways;

mode one: the positioning interface board is provided with a positioning pin, and a positioning hole matched with the positioning pin is formed in a corresponding position of the mounting seat;

mode two: the positioning interface board is provided with the positioning holes, and the corresponding positions of the mounting seats are provided with the positioning pins.

In one possible implementation manner, the diaphragm bodies in the first diaphragm group include two diaphragm bodies oppositely arranged along the first direction and a diaphragm driving mechanism for driving each diaphragm body to independently move, and the diaphragm bodies in the second diaphragm group include two diaphragm bodies oppositely arranged along the second direction and a diaphragm driving mechanism for driving each diaphragm body to independently move.

In one possible implementation manner, the diaphragm driving mechanism corresponding to any one of the first diaphragm group and the second diaphragm group comprises a diaphragm driving piece, a diaphragm screw rod and a diaphragm screw rod nut, wherein the diaphragm screw rod and the diaphragm screw rod nut are distributed along the movement direction of the diaphragm main body;

the output end of the diaphragm driving piece is in transmission connection with the diaphragm screw rod, the diaphragm screw rod nut is sleeved on the diaphragm screw rod, the diaphragm screw rod nut is connected with the diaphragm main body, and when the diaphragm driving piece works, the diaphragm screw rod nut can drive the diaphragm main body to do linear motion along the diaphragm screw rod.

In one possible implementation manner, the mounting base comprises a mounting base, and a first layer of mounting base and a second layer of mounting base which are arranged on the mounting base to form a double-layer structure, the first diaphragm group is mounted in the first layer of mounting base, and the second diaphragm group is mounted in the second layer of mounting base.

In one possible embodiment, the first layer mount and/or the second layer mount is slidably connected to the mounting base and forms a drawer-type structure.

In a possible embodiment, either one of the first and second diaphragm groups has an arc surface on a side closer to a beam central axis of the radiation source.

In a possible embodiment, the collimation system further comprises a primary collimation cone, which is arranged at the outlet of the radiation source.

The embodiment of the utility model also provides a treatment head, which comprises: the collimation system of any one of the above embodiments, further comprising the radiation source for emitting a radiation beam.

Compared with the prior art, the utility model has the beneficial effects that: by arranging the diaphragm body to move in a straight line, on the one hand, the diaphragm body moving in a straight line is easy to accelerate, and on the other hand, the movement stroke required by the diaphragm body to move in place is reduced, so that the dynamic response capability of the diaphragm body is improved. Through setting up the mode of detachable connection with location interface plate and mount pad, realized the modularization installation between diaphragm subassembly and the multi-leaf grating subassembly, when multi-leaf grating subassembly breaks down, can pull down location interface plate from the mount pad fast to separate diaphragm subassembly and multi-leaf grating subassembly, be convenient for maintain collimating system, thereby promote collimating system's maintenance efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 shows a schematic structural diagram of a collimation system provided by an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a positioning interface board according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a diaphragm assembly according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a first diaphragm assembly according to an embodiment of the present utility model;

fig. 5 shows a schematic structural diagram of a therapeutic head according to an embodiment of the present utility model.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Embodiments of the present utility model provide a collimation system for conformal adjustment of a beam emitted by a radiation source. Referring to fig. 1 and 2, the collimation system 10 includes a stop assembly 100, a multi-leaf collimator assembly 200, and a positioning interface plate 300. Wherein:

as shown in fig. 1, the diaphragm assembly 100 includes a mount 110, and a first diaphragm group 120 and a second diaphragm group 130 located within the mount 110, the first diaphragm group 120 and the second diaphragm group 130 (only one diaphragm body 131 in the second diaphragm group 130 is shown in fig. 1) being configured to be disposed in sequence along an exit beam direction (beam center axis exit beam direction S1) of the radiation source S. Wherein the diaphragm bodies (121, 122) in the first diaphragm group 120 are linearly movable in a first direction, such as the X-axis direction, and the diaphragm bodies 131 in the second diaphragm group 130 are linearly movable in a second direction, such as the Y-axis direction. Here, the first direction is perpendicular to the second direction.

Note that the X-axis direction and the Y-axis direction are directions bi-directional along the X-axis and the Y-axis, not the arrow directions shown in fig. 1.

The positioning interface plate 300 is detachably connected to the mount 110 in the diaphragm assembly 100, and referring to fig. 2, the positioning interface plate 300 penetrates through the middle to form a beam channel 310, and the beam channel 310 can pass a beam.

The multileaf grating assembly 200 is removably coupled to the positioning interface board 300, and the multileaf grating assembly 200 includes a plurality of oppositely disposed leaves movable in a first direction, such as the X-axis direction, as shown in fig. 1, and of course movable in a second direction, such as the Y-axis direction.

Here, the diaphragm assembly 100 may form a standard field, and may be adapted to different specifications of the multileaf grating assembly 200.

When the collimation system works, after beams emitted by the radiation source are subjected to primary beam shaping through the orthogonally distributed double-layer linear motion diaphragm assembly, rectangular radiation fields with different center positions and different sizes can be formed, and then the beams enter the multi-leaf grating assembly through the beam channel of the positioning interface plate to be subjected to secondary beam shaping, so that the expected radiation field irradiated to the target area is formed. On the one hand, the first diaphragm group and the second diaphragm group which are arranged in the mounting seat can do linear motion along the mutually perpendicular directions, so that the motion speed of the diaphragms is improved, the dynamic following of the blades in the multi-blade grating assembly is realized, the rapid field formation of the blades is matched, the field missed dose is reduced, the large-dose treatment technologies such as SBRT and the like can be supported, and the treatment safety is improved; on the other hand, as the first diaphragm group and the second diaphragm group participate in shielding the field rays, the requirements on blades are reduced, the height of the blades can be lower, and the movement flexibility and the field forming speed of the multi-blade grating assembly are further improved; in still another aspect, the diaphragm assembly is mounted on the mounting base, the multi-leaf grating assembly is detachably connected with the positioning interface plate, and the positioning interface plate is detachably connected with the mounting base, so that the diaphragm assembly and the multi-leaf grating assembly are of relatively independent modular structures, and the diaphragm assembly and the multi-leaf grating assembly can be integrally disassembled and assembled for maintenance through the integral collimating system connected with the positioning interface plate, maintainability is improved, and downtime of complex maintenance of a customer site is reduced.

The first direction may be an X-axis direction in the IEC coordinate system, and the second direction may be a Y-axis direction in the IEC coordinate system. Here, according to the practical and commonly used application scenario, the human body lies on the treatment bed (head advanced), the head and foot direction is the Y direction of the IEC coordinate system, the left and right direction of the human body is the X direction of the IEC coordinate system, and the up and down direction of the human body is the Z direction of the IEC coordinate system.

In some embodiments, the diaphragm bodies (121, 122) in the first diaphragm group 120 and the plurality of blades in the multi-blade grating assembly 200 all perform linear motion along the first direction, that is, the X-axis direction in the IEC coordinate system, so that the diaphragm bodies in the first diaphragm group are arranged closer to the radiation source, and the movement directions of the diaphragm bodies in the first diaphragm group and the plurality of blades in the multi-blade grating assembly are the same, so that the following of the plurality of blades in the multi-blade grating group in the maximum range can be performed, the following range of the diaphragm to the plurality of blades is improved, that is, the over-center capability is improved, the over-center range is improved to 100mm from 20mm before, and normal tissues around the target area of the edge area can be better protected.

In some embodiments, as shown in fig. 1, the collimation system further comprises a primary collimation cone 400, the primary collimation cone 400 being configured at the outlet of the radiation source S, the primary collimation cone 400 being used to limit the beam emitted by the radiation source S to a certain range.

In some embodiments, the removable connection between the positioning interface plate 300 and the mount 110, and between the multileaf grating assembly 200 and the positioning interface plate 300, may be a pin connection or a screw connection.

In some embodiments, the positioning interface board 300 and the mounting base 110 are configured in one of the following ways:

mode one: as shown in fig. 2 and 3, the positioning interface board 300 is provided with a positioning pin 320, and a positioning hole 111 adapted to the positioning pin 320 is provided at a corresponding position of the mounting seat 110; mode two: the positioning interface board 300 is provided with positioning holes, and the corresponding positions of the mounting seats 110 are provided with positioning pins.

When the locating pins are respectively inserted into the locating holes matched with the locating pins, the relative positions between the mounting seat and the locating interface board can be guaranteed to be preset correct mounting positions, namely, the multi-leaf grating assembly can be accurately located to the diaphragm assembly, quick locating and mounting between the multi-leaf gratings and between independent diaphragms are achieved, maintenance efficiency is improved, the accuracy cannot be influenced after the multi-leaf grating is disassembled and assembled again, and a calibration link is avoided.

It can be understood that referring to fig. 2 and 3, after the positioning between the mounting base 110 and the positioning interface board 300, screw holes for connecting the positioning interface board 300 and the mounting base 110 are further provided on the positioning interface board 300 and the mounting base 110, and the positioning interface board 300 and the mounting base 110 are fixedly connected by the adaptive screws.

In some embodiments, referring to fig. 1, either of the first aperture set 120 and the second aperture set 130 (121, 122, 131 or 132) has an arc surface on a side near the beam center axis of the radiation source. Therefore, the penumbra of the field formed by the diaphragm assembly can be reduced, and the dose gradient of the edge of the field can be improved.

In some embodiments, as shown in fig. 4, the diaphragm bodies in the first diaphragm group 120 include two diaphragm bodies 121 and 122 disposed opposite to each other in the first direction, and a diaphragm driving mechanism 123D that drives the diaphragm bodies 121 and 122 to move independently of each other, and as shown in fig. 3, the diaphragm bodies in the second diaphragm group 130 include two diaphragm bodies 131 and 132 disposed opposite to each other in the second direction, and a diaphragm driving mechanism 133D that drives the diaphragm bodies 131 and 132 to move independently of each other. Through the arrangement, any diaphragm main body can independently move, so that the flexibility of movement of the diaphragm main body is increased.

Since the diaphragm driving mechanisms (123D or 133D) corresponding to the first diaphragm group 120 and the second diaphragm group 130 are identical in configuration and connection, the diaphragm driving mechanism 123D corresponding to the diaphragm group 121 will be described below as an example.

As shown in fig. 4, the diaphragm driving mechanism 123D corresponding to the diaphragm body 121 includes a diaphragm driving member 123D1, a diaphragm screw rod 123D2 and a diaphragm screw rod nut 123D3 that are disposed along the movement direction of the diaphragm body 121, where the output end of the diaphragm driving member 123D1 is in transmission connection with the diaphragm screw rod 123D2, the diaphragm driving member 123D1 may be a driving motor, the diaphragm screw rod nut 123D3 is sleeved on the diaphragm screw rod 123D2, and the diaphragm screw rod nut 123D3 is connected with the diaphragm body 121. When the diaphragm driving piece 123D1 works, the diaphragm screw rod 123D2 is driven to axially rotate around the diaphragm driving piece, the diaphragm screw rod nut 123D3 moves along the diaphragm screw rod 123D2, and the diaphragm main body 121 is driven to linearly move along the diaphragm screw rod 123D 2. Here, the diaphragm screw rod is used as a main force transmission piece, so that the precision is high and the control is convenient. The diaphragm driving mechanism 133D corresponding to the diaphragm body 131 in fig. 5 includes a diaphragm driving member 133D1, a diaphragm screw rod 133D2 and a diaphragm screw rod nut 133D3 that are disposed along the movement direction of the diaphragm body 131, and the connection relationship thereof is the same as the connection relationship of the components in the diaphragm driving mechanism 123D corresponding to the diaphragm body 121, which is not described herein.

In some embodiments, as shown in fig. 4, the diaphragm driving mechanism 123D further includes a diaphragm limiting block 123D4, where two ends of the diaphragm limiting block 123D4 are sleeved on the diaphragm screw rod 123D2 and are respectively located at two ends of the diaphragm screw rod nut 123D3, so as to limit the movement stroke of the diaphragm body 121, and prevent the diaphragm body from exceeding the preset stroke range.

In some embodiments, the diaphragm driver 123D1 is controlled by a collimation system controller, which is electrically connected to the safety encoder 123D 5. The safety encoder 123D5 is configured to rotate under the driving of the diaphragm screw 123D2, so as to detect the real-time rotation number of the diaphragm screw 123D2, so as to know the movement distance of the diaphragm screw nut 123D3 according to the real-time rotation number, thereby knowing the linear displacement of the diaphragm body 121 on the corresponding diaphragm screw 123D2, and convert the linear displacement of the diaphragm body 121 into a digital pulse signal, and send the digital pulse signal to the collimation system controller. The collimation system controller judges whether the movement of the diaphragm body 121 is abnormal according to the obtained digital pulse signal, thereby maximally guaranteeing the position accuracy of the diaphragm body. The collimation system controller can be a singlechip or a computer.

Because the volume of the diaphragm driving mechanism is large, by stacking the plurality of diaphragm driving mechanisms 123D in the direction of the beam propagation direction OS1, the space utilization rate in the mount can be improved, and the total volume of the diaphragm assembly can be reduced. For example, referring to fig. 4, a diaphragm driving mechanism for driving the diaphragm body 121 to move and a diaphragm driving mechanism for driving the diaphragm body 122 to move are stacked in the mount 110 along the beam propagation direction.

In some embodiments, referring to fig. 3, the mounting base 110 includes a mounting base 112, and a first layer of mounting base 113 and a second layer of mounting base 114 disposed on the mounting base 112 to form a dual-layer structure, the first diaphragm set 120 is mounted in the first layer of mounting base 113, and the second diaphragm set 130 is mounted in the second layer of mounting base 114. The first layer of mounting seats 113 and the second layer of mounting seats 114 are stacked along the propagation direction of the beam, so as to improve the space utilization rate in the mounting seats 110.

In some embodiments, as shown in fig. 3, the first tier mounting blocks 113 and/or the second tier mounting blocks 114 are slidably coupled to the mounting base 112 and form a drawer-type structure. Through the above arrangement, the first layer mount 113 and/or the second layer mount 114 can be quickly assembled and disassembled from the mount base 112, so that the first diaphragm set 120 or the second diaphragm set 130 can be quickly maintained when the first diaphragm set or the second diaphragm set fails.

This embodiment provides a treatment head, as shown in fig. 5, comprising any of the collimation systems 10 of the above-described embodiments, and further comprising a radiation source S for emitting a radiation beam, the beam of radiation beam passing through the collimation system forming a desired radiation field.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims

1. A collimation system, comprising:

2. The collimation system of claim 1, wherein the first direction is an X-axis direction in an IEC coordinate system and the second direction is a Y-axis direction in the IEC coordinate system.

3. The alignment system of claim 1, wherein the positioning interface plate and the mount are configured in any of the following ways:

4. The collimating system of claim 1, wherein the aperture bodies in the first aperture group comprise two aperture bodies disposed opposite each other in the first direction and an aperture drive mechanism for driving each aperture body independently, and wherein the aperture bodies in the second aperture group comprise two aperture bodies disposed opposite each other in the second direction and an aperture drive mechanism for driving each aperture body independently.

5. The collimating system of claim 4, wherein the aperture drive mechanism corresponding to either one of the first aperture set and the second aperture set comprises an aperture drive, an aperture lead screw nut, disposed along a direction of motion of the aperture bodies;

6. The collimating system of claim 1, wherein the mounting base comprises a mounting base, and a first layer of mounting base and a second layer of mounting base disposed on the mounting base to form a bilayer structure, the first aperture set being mounted in the first layer of mounting base, and the second aperture set being mounted in the second layer of mounting base.

7. The alignment system of claim 6, wherein the first tier mount and/or the second tier mount are slidably coupled to a mounting base and form a drawer-type structure.

8. The collimation system of claim 1, wherein either one of the first and second aperture sets has an arc on a side proximate a beam center axis of the radiation source.

9. The collimation system of claim 1, further comprising a primary collimation cone disposed at an outlet of the radiation source.

10. A treatment head comprising the collimation system of any one of claims 1-9, further comprising the radiation source for emitting a radiation beam.