Particle accelerator and particle beam therapy system

Abstract

The utility model belongs to the technical field of high-end medical instruments, and discloses a particle accelerator and a particle beam therapy system. The particle accelerator includes a magnet and a shielding assembly. Wherein the magnet comprises a magnetic field part and a cold head which are connected with each other, and the magnetic field part can generate a magnetic field. The shielding assembly comprises an inner shielding piece, a middle shielding piece and an outer shielding piece, the inner shielding piece is provided with a closed cavity, a magnetic field part of the magnet is arranged in the closed cavity, the outer shielding piece is provided with a through groove penetrating through the outer shielding piece in the axis direction of the closed cavity, and the inner shielding piece and the middle shielding piece are both arranged in the through groove; the middle shielding piece is arranged between the outer peripheral surface of the inner shielding piece and the groove wall of the through groove; the inner shielding piece and the outer shielding piece are metal pieces capable of shielding a magnetic field, and the middle shielding piece is a non-metal piece capable of shielding the magnetic field. According to the utility model, the magnetic field generated by the magnet can be effectively shielded, the leakage of the magnetic field is avoided, and the reliability of a particle beam treatment system is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of high-end medical equipment, in particular to a particle accelerator and a particle beam therapy system. Background Art

[0002] Particle beam therapy systems use particle accelerators to accelerate particles to 230 MeV for use in radiotherapy. Particle accelerators provide a high-intensity, stable magnetic field, deflecting particles within the acceleration chamber and achieving cyclotron acceleration. The magnets within the particle accelerator are equipped with superconducting coils, providing the magnetic field required for synchronous particle acceleration.

[0003] A particle beam therapy system consists of a rotating gantry, a particle accelerator, and a treatment head. The rotating gantry is mounted on the walls of the patient treatment room. Both ends of the particle accelerator are connected to the rotating gantry, which drives the particle accelerator, which in turn rotates the treatment head around the patient. The particle accelerator generates a particle beam, which is then modulated by the treatment head and ultimately irradiated to the patient for treatment. During treatment, the magnet is in a superconducting state and generates a strong magnetic field. Therefore, the magnetic field must be shielded to prevent adverse effects on the patient or medical staff.

[0004] In order to avoid the influence of the magnetic field, the magnet is generally arranged in a magnetic field shielding part, and the magnetic field of the magnet is shielded by the magnetic field shielding part. The magnetic field shielding part in the prior art is a single-layer shielding, and there is a risk that the magnetic field shielding may not achieve the expected results. Therefore, it is necessary to improve the magnetic field shielding. Utility Model Content

[0005] The purpose of the utility model is to provide a particle accelerator and a particle beam therapy system for improving magnetic field shielding.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Particle accelerators, including:

[0008] a magnet provided with superconducting coils for generating a magnetic field;

[0009] A shielding assembly includes an inner shielding member, an intermediate shielding member and an outer shielding member arranged in sequence along the radial direction of the superconducting coil, the inner shielding member is provided with a closed cavity, the magnet is arranged in the closed cavity, the outer shielding member is provided with a through groove penetrating the outer shielding member along the axial direction of the closed cavity, the inner shielding member and the intermediate shielding member are both arranged in the through groove, the intermediate shielding member is clamped between the outer peripheral surface of the inner shielding member and the groove wall of the through groove, and the inner shielding member and the outer shielding member are both metal parts capable of weakening the magnetic field, and the intermediate shielding member is a non-metallic part capable of weakening the magnetic field.

[0010] As an optional solution, the inner shielding component includes two inner shielding split components that are interlocked along the axial direction of the closed cavity. The opposite inner sides of the two inner shielding split components are each provided with a cavity, and the cavities of the two inner shielding split components constitute the closed cavity.

[0011] As an optional solution, the intermediate shielding member includes a plurality of chain plates, which are connected to each other and can be enclosed on the outer peripheral surface of the inner shielding member around the axial direction of the closed cavity.

[0012] As an optional solution, any two adjacent chain plates are connected via a hinge.

[0013] As an optional solution, one end of the chain plate is provided with a groove extending along the axial direction of the closed cavity, and the other end is provided with a convex circle extending along the axial direction of the closed cavity. Among the two adjacent chain plates, the convex circle of one chain plate can be rotatably fitted with the groove of the other chain plate.

[0014] As an optional solution, the outer shielding component includes two outer shielding split components that are interlocked, and the outer shielding split components are provided with a through-groove that passes through the outer shielding split components along the axial direction of the closed cavity, and the through-grooves of the two outer shielding split components constitute the through-groove.

[0015] As an optional solution, along the axial direction of the closed cavity, the cross-sectional dimensions of the through slot at both sides of the intermediate shielding member gradually decrease outwards, so as to confine the intermediate shielding member within the through slot.

[0016] As an optional solution, the shielding assembly further includes a positioning post, which is fixedly provided on the inner shielding component and can pass through the intermediate shielding component and the outer shielding component to position the inner shielding component, the intermediate shielding component and the outer shielding component.

[0017] As an optional solution, two cylinders are further included, one end of each of the cylinders is installed in the through groove and is respectively located on both sides of the inner shielding member along the axial direction of the closed cavity, and the other ends of the two cylinders are respectively connected to two rotating frames.

[0018] A particle beam therapy system comprises the particle accelerator described in any one of the above schemes.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides a particle accelerator, wherein an inner shielding member is provided with a closed cavity, a magnet is disposed within the closed cavity to secure it, and the magnetic field portion of the magnet is located within the closed cavity, that is, the magnetic field portion of the magnet is located in the central area of the shielding assembly. The inner shielding member, made of a metal material, can effectively disperse and weaken the magnetic field to dilute the magnetic field; an intermediate shielding member, made of a non-metallic material, is then sleeved on the outer circumference of the inner shielding member to effectively shield the magnetic field diluted by the inner shielding member; finally, an outer shielding member, made of a metal material, is disposed outside the intermediate shielding member to further dilute the magnetic field. The particle accelerator can effectively shield the magnetic field generated by the magnet, preventing the magnetic field from affecting personnel or facilities outside the particle accelerator, thereby ensuring the reliability of the particle beam therapy system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of a particle accelerator provided by an embodiment of the present utility model;

[0022] Figure 2 yes Figure 1 Cross-sectional view of middle AA;

[0023] Figure 3 It is a structural schematic diagram of the inner shielding member involved in the embodiment of the present utility model;

[0024] Figure 4 It is a structural schematic diagram of the intermediate shielding member involved in the embodiment of the present utility model;

[0025] Figure 5 It is a structural schematic diagram of the chain plate involved in the embodiment of the present utility model;

[0026] Figure 6 It is a structural schematic diagram of the outer shielding member involved in the embodiment of the present utility model;

[0027] Figure 7 It is a structural schematic diagram of a particle accelerator provided by an embodiment of the present utility model installed on a rotating frame.

[0028] In the picture:

[0029] 1. Magnet; 11. Magnetic field unit; 12. Cold head;

[0030] 2. Shielding assembly; 21. Inner shielding member; 211. Inner shielding member; 2111. Cavity; 212. Enclosed cavity; 22. Intermediate shielding member; 221. Chain plate; 2211. Groove; 2212. Convex circle; 222. Hinge; 23. Outer shielding member; 231. Outer shielding member; 2311. Through slot; 232. Through slot; 24. Positioning post;

[0031] 3. Cylinder;

[0032] 100. Rotating rack. DETAILED DESCRIPTION

[0033] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of this utility model, unless otherwise expressly specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, mechanical or electrical connections, direct or indirect connections through an intermediate medium, and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0035] In the description of the present utility model, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0037] like Figures 1-6As shown, an embodiment of the present invention provides a particle accelerator, comprising a magnet 1 and a shielding assembly 2. The magnet 1 comprises a magnetic field portion 11 and a cold head 12 connected to each other. The magnetic field portion 11 is provided with a superconducting coil for generating a magnetic field. The shielding assembly 2 comprises an inner shield 21, an intermediate shield 22 and an outer shield 23 arranged in sequence along the radial direction of the superconducting coil. The inner shield 21 is provided with a closed cavity 212. The magnetic field portion 11 of the magnet 1 is arranged in the closed cavity 212. The outer shield 23 is provided with a through slot 232 that passes through the outer shield 23 along the axial direction of the closed cavity 212. The inner shield 21 and the intermediate shield 22 are both arranged in the through slot 232. The intermediate shield 22 is arranged between the outer circumferential surface of the inner shield 21 and the slot wall of the through slot 232. The inner shield 21 and the outer shield 23 are both metal parts capable of weakening the magnetic field, and the intermediate shield 22 is a non-metal part capable of weakening the magnetic field. The cold head 12 can pass through the inner shield 21 , the middle shield 22 and the outer shield 23 and is located outside the shield assembly 2 .

[0038] In the particle accelerator, an inner shield 21 is provided with a closed cavity 212, and a magnet 1 is provided in the closed cavity 212 to fix it, and the magnetic field portion 11 of the magnet 1 is located in the closed cavity 212, that is, the magnetic field portion 11 of the magnet 1 is located in the central area of the shielding assembly 2. The inner shield 21 made of metal material can effectively disperse and weaken the magnetic field to dilute the magnetic field; then the intermediate shield 22 made of non-metallic material is sleeved on the outer peripheral surface of the inner shield 21, which can effectively shield the magnetic field diluted by the inner shield 21; finally, the outer shield 23 made of metal material is provided outside the intermediate shield 22, which can dilute the magnetic field again. The utility model can effectively shield the magnetic field generated by the magnet 1, effectively avoid the leakage of the magnetic field, and improve the reliability of the particle beam therapy system.

[0039] Optionally, both inner shield 21 and outer shield 23 are made of low-sulfur, low-phosphorus iron (DT4), a high-quality steel with an iron content exceeding 99.5%. This material exhibits excellent magnetic permeability and effectively disperses and weakens the magnetic field. Intermediate shield 22 is made of boron-containing polyethylene sheet, a highly effective neutron shield with a shielding efficiency exceeding 98%, effectively weakening the magnetic field.

[0040] Alternatively, as Figure 3 As shown, the inner shielding component 21 includes two inner shielding split components 211 that are interlocked with each other. The inner side surfaces of the inner shielding split components 211 are concave and have a cavity 2111. The two inner shielding split components 211 are interlocked with each other and fixed to each other by screws. When the two inner shielding split components 211 are interlocked with each other, the two cavities 2111 form a closed cavity 212. This structure makes the installation of the magnet 1 more convenient.

[0041] Alternatively, as Figure 4-Figure 5 As shown, the intermediate shield 22 includes a plurality of chain plates 221, which are interconnected and capable of enclosing the outer circumference of the inner shield 21 around the axis of the closed cavity 212. This structure, by interconnecting the plurality of chain plates 221, facilitates the installation and processing of the intermediate shield 22, significantly reducing the difficulty of installation and processing. In addition, each chain plate 221 is individually removable and replaceable, significantly reducing maintenance costs.

[0042] Any two adjacent chain plates 221 among the plurality of chain plates 221 are connected by hinges 222. The hinges 222 can be connected to the chain plates 221 by screws, which is easy to install. In order to ensure a stable connection between the two chain plates 221, multiple hinges 222 can be set between any two adjacent chain plates 221 along the width direction of the chain plates 221.

[0043] In order to avoid gaps between adjacent chain plates 221, one end of the chain plate 221 is provided with a groove 2211 extending along the axial direction of the closed cavity 212, and the other end is provided with a convex circle 2212 extending along the axial direction of the closed cavity 212. Among the two adjacent chain plates 221, the convex circle 2212 of one chain plate 221 can be rotated and fitted with the groove 2211 of the other chain plate 221. This structure can effectively avoid the generation of gaps by rotating and fitting the convex circle 2212 and the groove 2211.

[0044] Alternatively, as Figure 6 As shown, the outer shielding component 23 includes two outer shielding split components 231 that are interlocked with each other. The outer shielding split components 231 are provided with a through-groove 2311 that passes through the outer shielding split components 231 along the axial direction of the closed cavity 212. The two outer shielding split components 231 are interlocked and connected by screws to form the outer shielding component 23, so that the through-grooves 2311 of the two outer shielding split components 231 form a through-groove 232. This structure makes the installation of the outer shielding component 23 more convenient and the structural design more reasonable.

[0045] Further, refer to Figure 2 As shown, along the axis of the closed cavity 212, the cross-sectional dimensions of the through-slot 232 on both sides of the intermediate shield 22 (i.e., the inner diameter of the through-slot 232) gradually decrease outward. This structure allows the intermediate shield 22 to be confined within the through-slot 232. Specifically, the inner diameter of the through-slot 2311 of the outer shielding member 231, along the axis of the closed cavity 212, gradually decreases from the inside to the outside. During installation, this structure engages the two outer shielding members 231 and confines the intermediate shield 22 within the through-slot 2311 of the two outer shielding members 231. Furthermore, since the inner diameter gradually decreases outward, the intermediate shield 22 can be effectively prevented from falling out of the through-slot 232.

[0046] Optionally, the shielding assembly 2 further includes a positioning column 24, which is fixedly disposed on the inner shielding member 21 and can penetrate the intermediate shielding member 22 and the outer shielding member 23 along the radial direction of the superconducting coil to position the inner shielding member 21, the intermediate shielding member 22 and the outer shielding member 23. Specifically, the inner side surface of the inner shielding split part 211 is provided with a first accommodating groove, and the positioning column 24 can be first set in the first accommodating groove of an inner shielding split part 211 and fixed by screws, and then the other inner shielding split part 211 is buckled with the inner shielding split part 211 so that the positioning column 24 is fixed in the first accommodating groove of the two inner shielding split parts 211; the intermediate shielding part 22 can have a through hole at the corresponding position, and the part of the positioning column 24 located outside the inner shielding part 21 can be passed through the through hole to position and install the intermediate shielding part 22; the inner side surface of the outer shielding split part 231 is provided with a second accommodating groove, and when the two outer shielding split parts 231 are buckled with each other, the part of the positioning column 24 passing through the intermediate shielding part 22 is limited to the second accommodating grooves of the two outer shielding split parts 231 to realize the positioning and installation of the outer shielding part 23.

[0047] A plurality of positioning posts 24 may be provided, and a plurality of positioning posts 24 can make positioning more accurate.

[0048] The particle accelerator fixes the magnet 1 to the central area of the shielding assembly 2. The shielding assembly 2 shields the magnetic field through a three-layer shielding structure (inner shield 21, middle shield 22 and outer shield 23), thereby improving the shielding effect. The overall structure is simple, lightweight and low-cost.

[0049] The present invention also provides a particle beam therapy system. Figure 7 As shown, the particle beam therapy system includes a rotating gantry 100, a treatment head, and the above-mentioned particle accelerator. Two rotating gantries 100 are provided, and the two rotating gantries 100 are respectively arranged on the walls of the treatment room. The particle accelerator also includes two cylinders 3, one end of each of the two cylinders 3 is installed in the through-groove 232 and is located on both sides of the inner shielding member 21 along the axial direction of the closed cavity 212, that is, one end of the two cylinders 3 is respectively arranged in the two through-grooves 2311, and the other ends of the two cylinders 3 are respectively connected to the two rotating gantries 100. The two rotating gantries 100 can drive the particle accelerator to rotate, thereby further driving the treatment head to rotate around the patient. The particle accelerator can generate a particle beam that is emitted through the shielding assembly 2, and then adjusted by the treatment head to finally complete the beam output to treat the patient.

[0050] When the particle beam therapy system is used to treat a patient, the shielding assembly 2 of the particle accelerator can prevent the magnetic field from interfering with the patient or other personnel. The shielding assembly 2 can also prevent interference with electronic devices within the cylinder 3 and the treatment room. The outer shielding member 23 not only shields the magnetic field but also serves as a connection, so that the shielding assembly 2 can be connected to the two rotating racks 100, thereby achieving a lightweight and simplified design of the particle accelerator.

[0051] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A particle accelerator, characterized in that include: A magnet (1) provided with a superconducting coil for generating a magnetic field; A shielding assembly (2) comprises an inner shielding member (21), an intermediate shielding member (22) and an outer shielding member (23) sequentially arranged along the radial direction of the superconducting coil, wherein the inner shielding member (21) is provided with a closed cavity (212), the magnet (1) is arranged in the closed cavity (212), the outer shielding member (23) is provided with a through slot (232) passing through the outer shielding member (23) along the axial direction of the closed cavity (212), the inner shielding member (21) and the intermediate shielding member (22) are both arranged in the through slot (232), the intermediate shielding member (22) is clamped between the outer peripheral surface of the inner shielding member (21) and the slot wall of the through slot (232), and the inner shielding member (21) and the outer shielding member (23) are both metal members capable of weakening the magnetic field, and the intermediate shielding member (22) is a non-metal member capable of weakening the magnetic field.

2. The particle accelerator according to claim 1, characterized in that The inner shielding component (21) comprises two inner shielding split components (211) that are interlocked along the axial direction of the closed cavity (212); the inner side surfaces of the two inner shielding split components (211) facing each other are each provided with a cavity (2111); and the cavities (2111) of the two inner shielding split components (211) constitute the closed cavity (212).

3. The particle accelerator according to claim 1, wherein The intermediate shielding member (22) comprises a plurality of chain plates (221), and the plurality of chain plates (221) are connected to each other and can be enclosed on the outer peripheral surface of the inner shielding member (21) around the axial direction of the closed cavity (212).

4. The particle accelerator according to claim 3, characterized in that Any two adjacent chain plates (221) are connected via a hinge (222).

5. The particle accelerator according to claim 3, characterized in that Of the two ends of the chain plate (221) in the axial direction of the closed cavity (212), one end is provided with a groove (2211) extending along the axial direction of the closed cavity (212), and the other end is provided with a convex circle (2212) extending along the axial direction of the closed cavity (212). Of the two adjacent chain plates (221), the convex circle (2212) of one chain plate (221) can be rotatably fitted with the groove (2211) of the other chain plate (221).

6. The particle accelerator according to claim 1, characterized in that The outer shielding component (23) comprises two outer shielding split components (231) that are interlocked with each other, and the outer shielding split component (231) is provided with a through slot (2311) that passes through the outer shielding split component (231) along the axial direction of the closed cavity (212), and the through slots (2311) of the two outer shielding split components (231) constitute the through slot (232).

7. The particle accelerator according to claim 1, characterized in that Along the axial direction of the closed cavity (212), the cross-sectional dimensions of the through slot (232) on both sides of the intermediate shielding member (22) gradually decrease outwards, so as to confine the intermediate shielding member (22) within the through slot (232).

8. The particle accelerator according to claim 1, characterized in that The shielding assembly (2) further includes a positioning column (24), which is fixedly arranged on the inner shielding member (21) and can pass through the intermediate shielding member (22) and the outer shielding member (23) to position the inner shielding member (21), the intermediate shielding member (22) and the outer shielding member (23).

9. The particle accelerator according to claim 1, characterized in that It also includes two cylinders (3), one end of each of the two cylinders (3) is installed in the through groove (232) and is respectively located on both sides of the inner shielding member (21) along the axial direction of the closed cavity (212), and the other ends of the two cylinders (3) are respectively connected to two rotating frames (100).

10. A particle beam therapy system, characterized in that A particle accelerator comprising the particle accelerator according to any one of claims 1 to 9.

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