Rotary double-layer multi-leaf collimator
By designing a rotating double-layer multi-leaf collimator, the problems of high leakage rate and poor conformal accuracy of multi-layer multi-leaf collimators are solved, achieving higher treatment accuracy and equipment space utilization efficiency, and adapting to the treatment needs of complex tumor shapes.
Patent Information
- Application Number
- CN202423012937.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-06
AI Technical Summary
Existing multi-layer, multi-leaf collimators in medical linear accelerators suffer from high leakage rates, poor conformal accuracy, and large space requirements, which affect treatment accuracy and equipment installation flexibility.
The rotating double-layer multi-leaf collimator is adopted. By independently rotating and staggering the blades of the upper and lower collimators, the shape and size of the shot field can be precisely adjusted, reducing the leakage rate between the blades and reducing the height and space occupation of the equipment.
It improves the conformal accuracy and energy transmission efficiency of treatment, reduces the leakage rate, saves equipment space, and enhances the precision of treatment and the installation flexibility of the equipment.
Smart Images
Figure CN223746855U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to radiotherapy equipment technical field, specifically relates to a rotary double -deck multileaf collimator. BACKGROUND
[0002] Medical electron linear accelerator is an important medical equipment commonly used in tumor treatment. It can produce high-energy electron beam or photon beam, which is used for irradiating tumor tissue to destroy cancer cells and control tumor growth. However, in order to ensure the accuracy and effectiveness of treatment, the shape and energy distribution of the beam must be accurately controlled to ensure that the tumor tissue receives sufficient dose and the surrounding normal tissue suffers minimal damage. Multileaf collimator (MLC) is a key component in modern radiotherapy equipment, which is used to dynamically adjust the shape and size of the beam to match the shape and size of the tumor. However, the existing medical electron linear accelerator still has the following shortcomings:
[0003] High leakage rate: due to the physical gap between the leaf structure of the single-layer MLC, the stray rays may pass through the gap between the leaves, affecting the dose accuracy and causing harm to normal tissues and organs.
[0004] Poor conformal accuracy: the field adjustment capability of traditional MLC is insufficient, especially for complex tumor shapes, it is difficult to achieve accurate coverage, the conformal degree of the field is low, and it cannot fully adapt to the treatment needs of complex tumor edges.
[0005] Large equipment space occupation: with the development of small and integrated radiotherapy equipment, the multi-layer MLC leaf structure increases the overall height and space occupation, limiting the installation conditions and flexibility of the equipment.
[0006] Therefore, the utility model patent is proposed. CONTENT OF THE UTILITY MODEL
[0007] The utility model provides a kind of rotary double -deck multileaf collimator, by optimizing design, increase the precision of field adjustment, improve the conformal degree to complex tumor shape, and significantly reduce equipment installation height.Specifically, the following technical solutions are adopted:
[0008] A kind of rotary double -deck multileaf collimator, comprising:
[0009] The upper collimator leaf assembly includes an upper leaf mounting structure and a plurality of upper collimator leaves, and the upper collimator leaves are reciprocally slidably mounted on the upper leaf mounting structure.
[0010] The lower collimator leaf assembly includes a lower leaf mounting structure and a plurality of lower collimator leaves, and the lower collimator leaves are reciprocally slidably mounted on the lower leaf mounting structure.
[0011] The treatment head bottom plate, the upper layer leaf blade mounting structure is fixedly mounted on the treatment head bottom plate, the lower layer leaf blade mounting structure is rotatably mounted on the treatment head bottom plate, the lower layer leaf blade mounting structure can be driven to rotate independently relative to the treatment head bottom plate, and the upper layer leaf blade mounting structure and the lower layer leaf blade mounting structure can be driven to rotate synchronously by controlling the treatment head bottom plate.
[0012] As an optional embodiment of the utility model, a rotating double-layer multi-leaf collimator comprises a rotating connection assembly, the rotating connection assembly comprises a fixed ring and a rotating ring sleeved on the inside or outside of the fixed ring, the rotating ring can rotate freely relative to the fixed ring, the fixed ring is fixedly mounted on the treatment head bottom plate, and the lower layer leaf blade mounting structure is connected with the rotating ring.
[0013] As an optional embodiment of the utility model, a rotating double-layer multi-leaf collimator comprises a rotating connection ring, and the lower layer leaf blade mounting structure is connected with the rotating ring through the rotating connection ring.
[0014] As an optional embodiment of the utility model, the rotating connection ring comprises a connection ring body and a plurality of connection convex bodies, the connection ring body is fixedly connected with the rotating ring, the connection convex bodies are distributed along the circumference of the connection ring body, one end of the connection convex body is fixedly connected with the connection ring body, and the other end extends a certain length and is fixedly connected with the lower layer leaf blade mounting structure.
[0015] As an optional embodiment of the utility model, the extension length of the connection convex body is higher than the overall height of the upper layer collimator leaf blade assembly.
[0016] As an optional embodiment of the utility model, a rotating double-layer multi-leaf collimator comprises a lower layer collimator driving assembly, and the lower layer collimator driving assembly drives the rotating ring or the rotating connection ring to rotate.
[0017] As an optional embodiment of the utility model, the lower layer collimator driving assembly comprises a driving motor and a driving wheel mounted on the motor shaft of the driving motor, and the driving wheel is in transmission connection with the connection ring body of the rotating connection ring.
[0018] As an optional embodiment of the utility model, the driving wheel is in transmission connection with the connection ring body of the rotating connection ring through a transmission belt, and the driving wheel and the connection ring body are respectively provided with transmission belt grooves on the outer peripheries thereof;
[0019] Or the driving wheel is in transmission connection with the connection ring body of the rotating connection ring through a transmission chain, and the driving wheel and the connection ring body are respectively provided with transmission chain teeth on the outer peripheries thereof;
[0020] Or the driving wheel is a driving gear, the outer periphery of the connecting ring body of the rotating connecting ring is provided with meshing teeth, and the driving gear is in meshing transmission with the meshing teeth of the connecting ring body.
[0021] As an optional embodiment of the utility model, the upper layer collimator blade assembly is located inside the circular ring of the rotating connecting assembly.
[0022] As an optional embodiment of the utility model, the lower layer blade mounting structure can be driven to rotate independently relative to the treatment head bottom plate, the lower layer blade mounting structure is driven to a position where the lower layer collimator blades are parallel to the upper layer collimator blades, and the gap between each lower layer collimator blade and the upper layer collimator blade is opposite.
[0023] Compared with the prior art, the utility model has the beneficial effects that:
[0024] The installation and use of the rotating double-layer multi-leaf collimator of the utility model are as follows: when installing, the upper layer blade mounting structure of the upper layer collimator blade assembly is fixed on the treatment head bottom plate, the treatment head bottom plate is rotated to adjust, and the upper half of the field is adjusted. The lower layer collimator blade assembly is rotatably suspended and fixed on the treatment head bottom plate through the lower layer blade mounting structure, and the two layers of blades are independently rotated to accurately adjust the shape and size of the field during use.
[0025] The rotating double-layer multi-leaf collimator of the utility model can form a field suitable for the shape of a tumor by rotating the angles of the upper layer collimator blades and the lower layer collimator blades according to the shape of the tumor during actual treatment. When the upper layer collimator blades and the lower layer collimator blades are staggered, the composite field reduces the leakage phenomenon and effectively improves the accuracy of treatment.
[0026] The rotating double-layer multi-leaf collimator of the utility model has the following beneficial effects:
[0027] Improved conformal accuracy: the positions of the blades can be more accurately adjusted by rotating the upper layer collimator blades and the lower layer collimator blades, so that the conformal accuracy of the collimator is improved.
[0028] Reduced leakage rate: the leakage rate between the blades can be reduced by parallel misplacement of the upper layer collimator blades and the lower layer collimator blades, so that the energy transmission efficiency and treatment accuracy of the linear accelerator are improved.
[0029] Space saving: by connecting the lower layer collimator blade assembly to the treatment head bottom plate, the connection space between the two layers of blades is reduced, and the space occupation is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0030] Figure 1The utility model embodiment a kind of three-dimensional structure schematic diagram of rotary double-layer multi-leaf collimator;
[0031] Figure 2 The utility model embodiment a kind of structure schematic diagram of realizing lower collimator blade assembly independent rotation of rotary double-layer multi-leaf collimator;
[0032] Figure 3 The utility model embodiment a kind of structure schematic diagram of lower collimator drive assembly of rotary double-layer multi-leaf collimator;
[0033] Figure 4 The utility model embodiment a kind of upper collimator blade and lower collimator blade parallel misplacement schematic diagram of rotary double-layer multi-leaf collimator;
[0034] Figure 5 The utility model embodiment a kind of upper collimator blade and lower collimator blade rotation conforming schematic diagram of rotary double-layer multi-leaf collimator. DETAILED DESCRIPTION
[0035] To make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be clearly and completely described below in conjunction with the drawings. Obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments.
[0036] Therefore, the following detailed description of the embodiment of the utility model is not intended to limit the scope of the claimed utility model, but only represents some embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the utility model.
[0037] It should be noted that, in the case of no conflict, the embodiments and the features and technical solutions in the embodiments in the utility model can be combined with each other.
[0038] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0039] In the description of the utility model, it is necessary to explain that the orientation or position relation indicated by the terms such as '' upper '' and '' lower '' is the orientation or position relation shown in the drawing, or the orientation or position relation of the utility model product when being used commonly, or the orientation or position relation commonly understood by the person skilled in the art, these terms are only for the convenience of describing the utility model and simplifying the description, and not for indicating or implying that the device or element indicated must have a particular orientation, structure and operation, therefore, it cannot be understood as the limitation of the utility model. In addition, the terms '' first '' and '' second '' are only used for distinguishing the description, and cannot be understood as indicating or implying relative importance.
[0040] Referring to Figures 1-3 The utility model discloses a kind of rotating double-layer multileaf collimators of the embodiment, comprising:
[0041] Upper collimator leaf assembly 4, including upper layer leaf mounting structure (not shown) and multiple upper collimator leaves 401, the upper collimator leaf 401 is reciprocatingly slidably mounted on the upper layer leaf mounting structure;
[0042] Lower collimator leaf assembly 5, including lower layer leaf mounting structure 502 and multiple lower collimator leaves 501, the lower collimator leaf 501 is reciprocatingly slidably mounted on the lower layer leaf mounting structure 502;
[0043] Treatment head bottom plate 1, the upper layer leaf mounting structure is fixedly mounted on the treatment head bottom plate 1, the lower layer leaf mounting structure 502 is rotatably mounted on the treatment head bottom plate 1, the lower layer leaf mounting structure 502 can be driven independently rotating relative to treatment head bottom plate 1, the upper layer leaf mounting structure, lower layer leaf mounting structure 502 can be driven synchronous rotation by controlling the treatment head bottom plate 1.
[0044] The utility model discloses a kind of rotating double-layer multileaf collimators of the embodiment, the installation and use of equipment: when installing, the upper layer leaf mounting structure of upper collimator leaf assembly 4 is fixed on treatment head bottom plate 1, is responsible for the adjustment of upper half field by treatment head bottom plate 1 rotation adjustment.The lower collimator leaf assembly 5 is rotatably hung and fixed on treatment head bottom plate 1 by lower layer leaf mounting structure 502, the shape and size of field are accurately adjusted by independent rotation in the use process of two layers of leaves.
[0045] The utility model discloses a kind of rotating double-layer multileaf collimators, in actual treatment, medical staff can form the field of tumor shape according to the shape of tumor by rotating the angle of upper collimator leaf 401, lower collimator leaf 501.When upper collimator leaf 401, lower collimator leaf 501 are staggered, composite field reduces the leakage phenomenon, effectively improves the accuracy of treatment.
[0046] The rotating double-layer multi-leaf collimator has the following beneficial effects:
[0047] Improved conformal accuracy: By rotating the upper-layer collimator leaves 401 and the lower-layer collimator leaves 501, the positions of the leaves can be more accurately modulated, thereby improving the conformal accuracy of the collimator.
[0048] Reduced leakage rate: By parallel mispositioning the upper-layer collimator leaves 401 and the lower-layer collimator leaves 501, the leakage rate between the leaves can be reduced, thereby improving the energy transmission efficiency and treatment accuracy of the linear accelerator.
[0049] Space saving: By connecting the lower-layer collimator leaf assembly 5 to the treatment head bottom plate 1, the connection space between the two layers of leaves is reduced, thereby reducing the space occupation.
[0050] As an optional embodiment of the present embodiment, the rotating double-layer multi-leaf collimator comprises a rotating connection assembly 2, which comprises a fixed ring 201 and a rotating ring 202 sleeved inside or outside the fixed ring 201. The rotating ring 202 is freely rotatable relative to the fixed ring 201. The fixed ring 201 is fixedly installed on the treatment head bottom plate 1. The lower-layer leaf mounting structure 502 is connected to the rotating ring 202. In this way, by cooperating with an independent driving device, the lower-layer leaf mounting structure 502 can be independently rotatably installed on the treatment head bottom plate 1.
[0051] Further, the rotating double-layer multi-leaf collimator comprises a rotating connection ring 3. The lower-layer leaf mounting structure 502 is connected to the rotating ring 202 through the rotating connection ring 3. In the present embodiment, the rotating connection ring 3 is used to rotatably install the lower-layer leaf mounting structure 502 on the treatment head bottom plate 1, thereby increasing the height between the lower-layer leaf mounting structure 502 and the treatment head bottom plate 1 and providing installation space for the upper-layer collimator leaf assembly 4.
[0052] Specifically, the rotating connection ring 3 comprises a connection ring body 301 and a plurality of connection protrusions 302. The connection ring body 301 is fixedly connected to the rotating ring 202. The connection protrusions 302 are distributed along the circumference of the connection ring body 301. One end of each connection protrusion 302 is fixedly connected to the connection ring body 301, and the other end extends a certain length and is fixedly connected to the lower-layer leaf mounting structure 502.
[0053] Further, in order to meet the space requirement for installing the upper-layer collimator leaf assembly 4, the extension length of the connection protrusions 302 is higher than the overall height of the upper-layer collimator leaf assembly 4.
[0054] Reference is made to Figure 3As shown, in order to realize the independent rotation of the lower collimator leaf assembly 5 below the treatment head base plate 1, the rotating double-layer multi-leaf collimator of the embodiment comprises a lower collimator driving assembly which drives the rotation of the rotating ring 202 or the rotating connection ring 3. The lower collimator driving assembly of the embodiment independently drives the rotation of the lower collimator driving assembly 5, and the rotation of the treatment head base plate 1 drives the rotation of the upper collimator leaf assembly 4 and the lower collimator driving assembly 5.
[0055] Therefore, the lower collimator leaf assembly 5 of the embodiment adopts a suspension design, avoids the complex mechanical connection with the upper collimator leaf assembly 4, and significantly reduces the overall thickness and installation height of the equipment.
[0056] As an optional implementation of the embodiment, the lower collimator driving assembly of the embodiment comprises a driving motor 601 and a driving wheel 603 mounted on the motor shaft of the driving motor 601, and the driving wheel 603 is in transmission connection with the connection ring body 301 of the rotating connection ring 3.
[0057] Specifically, the driving wheel 603 is in transmission connection with the connection ring body 301 of the rotating connection ring 3 through a transmission belt 604, and the driving wheel 603 and the connection ring body 301 are respectively provided with transmission belt grooves on the outer periphery.
[0058] Alternatively, the driving wheel 603 is in transmission connection with the connection ring body 301 of the rotating connection ring 3 through a transmission chain, and the driving wheel 603 and the connection ring body 301 are respectively provided with transmission chain teeth on the outer periphery.
[0059] Alternatively, the driving wheel 603 is a driving gear, the connection ring body 301 of the rotating connection ring 3 is provided with meshing teeth on the outer periphery, and the driving gear is in meshing transmission with the meshing teeth of the connection ring body 301.
[0060] The upper collimator leaf assembly 4 of the embodiment is located inside the circular ring of the rotating connection assembly 2.
[0061] Referring to Figure 4 As shown, the lower leaf mounting structure 502 of the rotating double-layer multi-leaf collimator of the embodiment can be driven to rotate independently relative to the treatment head base plate 1, the lower leaf mounting structure 502 is driven to a position where the lower collimator leaves 501 are parallel to the upper collimator leaves 401, and each lower collimator leaf 501 is opposite to the gap between the upper collimator leaves 401. During actual treatment, medical staff can rotate the angles of the upper collimator leaves 401 and the lower collimator leaves 501 to form a radiation field suitable for the shape of the tumor according to the shape of the tumor. When the upper collimator leaves 401 and the lower collimator leaves 501 are staggered, the composite radiation field reduces the leakage phenomenon and effectively improves the accuracy of treatment.
[0062] Referring to Figure 5 As shown in the figure, the lower layer leaf mounting structure 502 of the rotating double-layer multi-leaf collimator of the embodiment can be driven to rotate independently relative to the treatment head bottom plate 1, the lower layer leaf mounting structure 502 is driven to a position in which the lower layer collimator leaf 501 is perpendicular to the upper layer collimator leaf 401, the upper layer collimator leaf 401 and the lower layer collimator leaf 501 are adjusted independently respectively, the precise control of the field edge is realized, the precision of the field adjustment is improved, the tumor field of different shapes is adapted, and the high conformal therapy of the complex shape tumor is realized.
[0063] The above embodiments are only used to illustrate the technical solutions described in the utility model and not to limit the technical solutions described in the utility model, although the utility model has been described in detail in the above description with reference to the above embodiments, the utility model is not limited to the above specific embodiments, therefore any modification or equivalent replacement of the utility model; and all technical solutions and improvements which do not deviate from the spirit and scope of the utility model are all covered in the claim range of the utility model.
Claims
1. A rotating double-layered multi-leaf collimator, characterized by, The application relates to a collimator assembly, which comprises: an upper collimator blade assembly, which comprises an upper blade mounting structure and a plurality of upper collimator blades, the upper collimator blades being reciprocally slidably mounted on the upper blade mounting structure; a lower collimator blade assembly, which comprises a lower blade mounting structure and a plurality of lower collimator blades, the lower collimator blades being reciprocally slidably mounted on the lower blade mounting structure; a treatment head bottom plate, the upper blade mounting structure being fixedly mounted on the treatment head bottom plate, the lower blade mounting structure being rotatably mounted on the treatment head bottom plate, the lower blade mounting structure being independently rotatable relative to the treatment head bottom plate, the upper blade mounting structure and the lower blade mounting structure being synchronously rotatable by controlling the treatment head bottom plate.
2. A rotating double layer multi-leaf collimator according to claim 1, wherein, The application further relates to a rotating connection assembly, which comprises a fixed ring and a rotating ring sleeved on the inside or outside of the fixed ring, the rotating ring being freely rotatable relative to the fixed ring, the fixed ring being fixedly mounted on the treatment head bottom plate, the lower blade mounting structure being connected with the rotating ring.
3. A rotating double layer multi-leaf collimator according to claim 2, wherein, The lower blade mounting structure is connected with the rotating ring through a rotating connection ring.
4. A rotating double layer multi-leaf collimator according to claim 3, wherein, The rotating connection ring comprises a connection ring body and a plurality of connection protrusions, the connection protrusions being distributed along the circumference of the connection ring body, one end of the connection protrusions being fixedly connected with the connection ring body, the other end of the connection protrusions extending a certain length and being fixedly connected with the lower blade mounting structure.
5. A rotating double layer multi-leaf collimator according to claim 4, wherein, The extension length of the connection protrusions is higher than the overall height of the upper collimator blade assembly.
6. A rotating double layer multi-leaf collimator according to claim 4, wherein, The application further relates to a lower collimator driving assembly, which drives the rotating ring or the rotating connection ring to rotate.
7. A rotating double layer multi-leaf collimator according to claim 6, wherein, The lower collimator driving assembly comprises a driving motor and a driving wheel mounted on the motor shaft of the driving motor, the driving wheel being in transmission connection with the connection ring body of the rotating connection ring.
8. A rotating double layer multi-leaf collimator according to claim 7, wherein, The driving wheel is in transmission connection with the connection ring body of the rotating connection ring through a transmission belt, the outer periphery of the driving wheel and the connection ring body being respectively provided with transmission belt grooves. Alternatively, the driving wheel is in transmission connection with the connection ring body of the rotating connection ring through a transmission chain, the outer periphery of the driving wheel and the connection ring body being respectively provided with transmission chain teeth. Alternatively, the driving wheel is a driving gear, the outer periphery of the connection ring body of the rotating connection ring being provided with meshing teeth, the driving gear being in meshing transmission with the meshing teeth of the connection ring body.
9. The rotating double-layered multi-leaf collimator of claim 2, wherein, The upper collimator blade assembly is located inside the circular ring of the rotating connection assembly.
10. The rotating double-layered multi-leaf collimator of claim 1, wherein, The lower blade mounting structure is independently rotatable relative to the treatment head bottom plate, the lower blade mounting structure being driven to a position where the lower collimator blades are parallel to the upper collimator blades, each lower collimator blade being opposite to the gap between the upper collimator blades.