Gradient coil assembly and magnetic resonance imaging equipment

Abstract

The utility model belongs to the field of medical equipment, and provides a gradient coil assembly and magnetic resonance imaging equipment, the magnetic resonance imaging equipment comprises the gradient coil assembly, the gradient coil assembly comprises a gradient coil and a damping structure, the damping structure is connected with the gradient coil, and the damping structure is a particle damper or a fluid damper. The damping structure is used for converting part of vibration energy of the gradient coil into heat energy, vibration reduction of the gradient coil is achieved, and when the particle damper is adopted in the damping structure, when the gradient coil vibrates, the gradient coil transmits part of vibration energy to the particle damper, so that vibration reduction of the gradient coil is achieved. When a fluid damper is adopted in the damping structure, when the gradient coil vibrates, fluid of the damping structure is driven to flow so as to generate internal friction, and therefore the vibration energy of the gradient coil can be converted into heat energy. Therefore, part of vibration energy of the gradient coil is converted into heat energy.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of medical equipment, and more particularly to a gradient coil assembly and a magnetic resonance imaging device. BACKGROUND

[0002] Magnetic resonance imaging (MRI) is a technology for imaging by using magnetic resonance phenomenon, wherein a gradient coil is one of core components in an MRI device, and its main role is to convert electric energy into magnetic energy to generate a three-dimensional linear gradient magnetic field for magnetic resonance imaging, and to perform layer selection, phase coding and frequency coding on an MRI signal.

[0003] When the gradient coil is in an energized working state, it will continuously vibrate violently due to the action of electromagnetic force, thereby causing a large noise and affecting the reliability of the MRI device. CONTENT OF THE UTILITY MODEL

[0004] The gradient coil assembly and the magnetic resonance imaging device are provided to solve the technical problem of the existing technology that the gradient coil vibrates violently and generates a large noise when it is in an energized working state.

[0005] To achieve the above-mentioned purpose, the first aspect of the application provides a gradient coil assembly, comprising:

[0006] a gradient coil; and

[0007] a damping structure connected with the gradient coil, wherein the damping structure is a particle damper.

[0008] Optionally, the gradient coil is provided with a cavity, and the particle damper comprises a plurality of particles movably arranged in the cavity.

[0009] Optionally, the gradient coil assembly further comprises an isolation layer arranged in the cavity and located between the inner wall of the cavity and the particle damper.

[0010] Optionally, the particle damper is arranged outside the gradient coil.

[0011] Optionally, the particle damper comprises a tube body and a plurality of particles, the tube body is sleeved on the outer circumferential side of the gradient coil, and the plurality of particles are movably arranged between the tube body and the gradient coil.

[0012] Optionally, the particle damper comprises a tube body arranged in parallel and spaced apart from the gradient coil and a plurality of particles movably arranged in the tube body, and the gradient coil assembly further comprises a base body encapsulating the gradient coil and the tube body as a whole.

[0013] Optionally, the gradient coil assembly further comprises a cooling structure, which is thermally coupled with the gradient coil and / or the particle damper.

[0014] Optionally, the gradient coil is provided with a cavity, the particle damper is arranged in the cavity, the cooling structure is arranged outside the gradient coil, and the gradient coil assembly further comprises a base body which encapsulates the gradient coil and the cooling structure as a whole; or, the gradient coil is provided with a cavity and a cooling cavity, the particle damper is arranged in the cavity, and the cooling structure is arranged in the cooling cavity; or, the gradient coil, the particle damper and the cooling structure are arranged in parallel and spaced apart from each other, and the gradient coil assembly further comprises a base body which encapsulates the gradient coil, the particle damper and the cooling structure as a whole.

[0015] The second aspect of the present application provides a gradient coil assembly, comprising:

[0016] a gradient coil; and

[0017] a damping structure connected with the gradient coil, the damping structure being a fluid damper.

[0018] The third aspect of the present application provides a magnetic resonance imaging device, comprising a magnet and the gradient coil assembly according to any one of the above aspects, the gradient coil assembly being arranged in the magnet.

[0019] The gradient coil assembly and the magnetic resonance imaging device provided by the present application have the following beneficial effects: compared with the prior art, the gradient coil assembly provided by the present application connects the damping structure with the gradient coil, the damping structure is used to convert part of the vibration energy of the gradient coil into heat energy, thereby achieving vibration reduction of the gradient coil; when the damping structure adopts the particle damper, part of the vibration energy of the gradient coil is transmitted to the particle damper to drive the particles of the particle damper to vibrate and collide and rub between the particles, thereby quickly and efficiently converting the vibration energy of the gradient coil into heat energy to consume the vibration energy, thereby achieving vibration reduction of the gradient coil; when the damping structure adopts the fluid damper, the fluid of the damping structure flows to generate internal friction when the gradient coil vibrates, thereby converting part of the vibration energy of the gradient coil into heat energy, achieving vibration reduction and noise reduction of the gradient coil, effectively reducing noise and ensuring the reliability of the operation of the MRI device. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0021] Figure 1 A cross-sectional structure diagram of a gradient coil assembly provided for some embodiments of the present application Figure One ;

[0022] Figure 2 A front view structure diagram of a gradient coil provided for some embodiments of the present application

[0023] Figure 3 A cross-sectional structure diagram of a gradient coil assembly provided for some embodiments of the present application Figure Two ;

[0024] Figure 4 A cross-sectional structure diagram of a gradient coil assembly provided for some embodiments of the present application Figure Three ;

[0025] Figure 5 A partial structure diagram of a gradient coil assembly provided for some embodiments of the present application Figure One ;

[0026] Figure 6 A partial structure diagram of a gradient coil assembly provided for some embodiments of the present application Figure Two ;

[0027] Figure 7 A cross-sectional structure diagram of a gradient coil assembly provided for some embodiments of the present application Figure Four ;

[0028] Figure 8 A cross-sectional structure diagram of a gradient coil assembly provided for some embodiments of the present application Figure Five ;

[0029] Figure 9 A cross-sectional structure diagram of a gradient coil assembly provided for some embodiments of the present application Figure Six .

[0030] In the drawings, various reference signs represent:

[0031] 10, gradient coil; 11, cavity; 12, cooling cavity; 20, damping structure; 21, particle; 22, tube body; 23, fluid; 30, cooling structure; 31, cooling medium; 40, base body; 50, isolation layer. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and not to limit the present application.

[0033] It should be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] In the present application, unless specifically defined and limited otherwise, the terms "mount", "connect", "connection", "fixed", and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0036] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0037] Please refer to Figures 1 to 4 , now the gradient coil assembly provided by the embodiments of the present application will be described.

[0038] Please refer to Figure 1The gradient coil assembly comprises a gradient coil 10 and a damping structure 20 connected with the gradient coil 10, the damping structure 20 is a particle damper, when the gradient coil 10 vibrates, the gradient coil 10 transmits part of the vibration energy to the particle damper, and drives the particles 21 of the particle damper to vibrate, so as to convert part of the vibration energy into heat energy.

[0039] The gradient coil 10 is used to generate a magnetic field by energization, and it can be understood that according to the principle of electromagnetic induction, a magnetic field will be generated around the gradient coil 10 when the current changes.

[0040] The damping structure 20 mainly utilizes the internal friction effect to convert the vibration energy of the gradient coil 10 into heat energy, so as to damp and reduce the noise of the gradient coil 10. When the damping structure 20 is a particle damper, the damping principle of the particle damper is to utilize the vibration of the particles 21 and the mutual collision and friction between the particles 21 to convert the vibration energy into heat energy, so as to generate a damping effect to suppress the vibration of the gradient coil 10, thereby achieving the purpose of vibration reduction and noise reduction.

[0041] The connection of the damping structure 20 with the gradient coil 10 can mean that the damping structure 20 is directly connected with the gradient coil 10, for example, the damping structure 20 is directly assembled inside or outside the gradient coil 10, or the damping structure 20 is indirectly connected with the gradient coil 10, for example, the damping structure 20 and the gradient coil 10 are packaged into one body by using a base body 40, such as Figure 6 It can be understood that no matter whether the damping structure 20 is directly connected with the gradient coil 10 or indirectly connected with the gradient coil 10, as long as the gradient coil 10 can transmit the vibration energy to the damping structure 20 when vibrating.

[0042] In addition, the damping structure 20 adopts the particle damper, and through the vibration of the particles 21 and the collision and friction between the particles 21, the vibration energy can be efficiently converted into heat energy, the vibration reduction effect is obvious, and the additional mass generated by the change of the original structure of the gradient coil 10 is small.

[0043] In the embodiment, since the mechanical wave generated by the vibration of the gradient coil has a wave crest, that is, the place where the gradient coil vibrates most severely, arranging the particle damper at the position where the gradient coil 10 vibrates most severely is equivalent to arranging the damping structure 20 on the wave crest of the vibration, so that the particle damper can accurately reduce the vibration amplitude of the gradient coil 10 when the gradient coil 10 vibrates. Of course, in other embodiments, the particle damper can also be arranged on the entire circumference of the gradient coil 10 to simultaneously damp the entire gradient coil 10.

[0044] In some embodiments of the present application, please refer to Figure 1 andFigure 2 The gradient coil 10 is provided with a cavity 11, and the particle damper is arranged in the cavity 11.

[0045] Optionally, the gradient coil 10 is a metal tube, for example, a copper tube, the cavity 11 is arranged at the center of the gradient coil 10, the length of the cavity 11 extends along the length of the gradient coil 10, and the cavity 11 penetrates one end or both ends of the gradient coil 10. Understandably, the gradient coil 10 is a hollow structure.

[0046] The above technical scheme, by arranging the cavity 11 in the gradient coil 10 and arranging the particle damper in the cavity 11, the assembly is simple, and the structure between the particle damper and the gradient coil 10 is relatively compact, which effectively avoids the particle damper occupying the space of the MRI equipment, thereby effectively reducing the space occupation of the gradient coil assembly.

[0047] Optionally, the particle damper includes a plurality of particles 21, and the plurality of particles 21 are movably arranged in the cavity 11. Specifically, when the particle damper and the gradient coil 10 are assembled, the plurality of particles 21 are inserted into the cavity 11 from the end of the cavity 11, and then the end of the cavity 11 is sealed. The diameter of the particle 21 is much smaller than the diameter of the cavity 11, so that when the gradient coil 10 vibrates, the particles 21 of the particle damper vibrate in the cavity 11, so that the particles 21 and the particles 21, and the particles 21 and the inner wall of the cavity 11 collide and rub, thereby converting part of the vibration energy of the gradient coil 10 into heat energy, achieving vibration and noise reduction of the gradient coil 10.

[0048] The material of the particle 21 can be but not limited to metal, plastic, ceramic or rubber, etc., which can be selected according to actual use requirements. For example, when the particle 21 is required to be an insulator, the material of the particle 21 can be plastic, ceramic or rubber, etc., and when the particle 21 is allowed to have conductivity, the material of the particle 21 can be metal, such as copper, aluminum, etc.

[0049] In addition, the particle 21 can also have heat conduction performance, so that the particle 21 can transfer the heat energy generated by itself to dissipate heat and quickly transfer the heat energy.

[0050] It should be noted that the particles 21 can be hard particles or viscoelastic particles. When the particles 21 are hard particles, the vibration of the particles 21, the collision and friction between the particles 21 can be more intense when the gradient coil 10 vibrates, and the vibration energy of the gradient coil 10 can be efficiently converted into heat energy. When the particles 21 are viscoelastic particles, in addition to the vibration of the particles 21 and the collision and friction between the particles 21, the particles 21 can also produce elastic strain when the gradient coil 10 vibrates, and the vibration energy of the gradient coil 10 can be converted into heat energy in multiple ways, which is beneficial to improve the vibration reduction effect of the gradient coil 10, and at the same time, it is beneficial to reduce the impact force of the particles 21 on the inner wall of the cavity 11 and reduce the damage to the inner wall of the cavity 11.

[0051] The above technical solution directly arranges a plurality of particles 21 in the cavity 11, which is simple in structure and is beneficial to reduce production costs.

[0052] In some embodiments, referring to Figure 1 , when the particle damper is arranged in the cavity 11, the gradient coil assembly further comprises an isolation layer 50, which is arranged in the cavity 11 and located between the inner wall of the cavity 11 and the particle damper.

[0053] By arranging the isolation layer 50 between the inner wall of the cavity 11 and the particle damper, the inner wall of the cavity 11 can be protected, and the particle damper can be prevented from directly colliding with the inner wall of the cavity 11 to damage the inner wall of the cavity 11.

[0054] Optionally, the isolation layer 50 can be a hard layer or a flexible layer.

[0055] In some embodiments, referring to Figure 1 , when the particles 21 of the particle damper are directly arranged in the cavity 11, the isolation layer 50 is a flexible layer and wraps all the particles 21.

[0056] Optionally, the isolation layer 50 is an insulator and has heat conduction performance. For example, the isolation layer 50 can be made of a thermoplastic elastomer (TPE) filled with a heat-conducting material, a thermoplastic polyurethane (TPU) filled with a heat-conducting material, polyvinyl chloride (PVC) filled with a heat-conducting material, or rubber.

[0057] During assembly, the isolation layer 50 can be attached to the inner wall of the cavity 11 first, and then a plurality of particles 21 are inserted into the cavity 11 and wrapped by the isolation layer 50. Alternatively, the isolation layer 50 can be wrapped around a plurality of particles 21 to form a combination, and then the combination is assembled into the cavity 11.

[0058] The technical solution has the advantages that the isolation layer 50 is wrapped around the particles 21 to separate the particles 21 from the inner wall of the cavity 11, so that the particles 21 are prevented from directly impacting the inner wall of the cavity 11, and the inner wall of the cavity 11 is effectively prevented from being damaged by long-term impact of the particles 21.

[0059] In some other embodiments of the present application, the particle damper can also be arranged outside the gradient coil 10.

[0060] The particle damper is arranged outside the gradient coil 10, so that the structure of the gradient coil 10 itself is not affected. Understandably, when the particle damper is attached to the gradient coil 10, the structure of the gradient coil 10 itself does not need to be changed, which is conducive to reducing production costs.

[0061] Optionally, the particle damper comprises a tube body 22 and a plurality of particles 21, the tube body 22 is sleeved on the outer circumferential side of the gradient coil 10, and the plurality of particles 21 are movably arranged between the tube body 22 and the gradient coil 10, such as Figure 3 .

[0062] The tube body 22 can be, but is not limited to, a hollow metal tube or a flexible woven tube.

[0063] When the gradient coil 10 vibrates, the particle damper synchronously vibrates, so that the particles 21 collide, rub and vibrate between the particles 21 and the tube body 22, between the particles 21 and the gradient coil 10, and between the particles 21 and the particles 21, so as to realize the conversion of vibration energy into heat energy.

[0064] The technical solution has the advantages that the tube body 22 is sleeved on the outer circumferential side of the gradient coil 10, the plurality of particles 21 are movably arranged between the tube body 22 and the gradient coil 10, the particle damper is integrated with the gradient coil 10, the structure is compact, which is conducive to reducing the volume of the gradient coil 10, reducing the space occupation of the gradient coil assembly, and making the assembly of the particle damper and the gradient coil 10 more stable. In addition, in the production process, when the spiral winding process of the gradient coil 10 is completed, the spiral winding process of the particle damper is also completed, and the particle damper does not need to be additionally spirally wound, which is conducive to saving processes and reducing production costs.

[0065] Optionally, the particle damper comprises a tube body 22 and a plurality of particles 21, the plurality of particles 21 are movably arranged in the tube body 22, the tube body 22 and the gradient coil 10 are arranged in parallel and spaced apart, and the gradient coil assembly further comprises a base body 40, which encapsulates the gradient coil 10 and the tube body 22 as a whole, such as Figure 6 .

[0066] Specifically, the length extension direction of the tube body 22 is the same as the length extension direction of the gradient coil 10. Optionally, the tube body 22 can be, but is not limited to, a hollow metal tube or a flexible braided tube.

[0067] The base body 40 is made of a high molecular material, such as epoxy resin or polyurethane. At the same time, the base body 40 also has heat conduction performance, for example, a heat conduction material can be filled in the base body 40 of epoxy resin, and the heat conduction material can be, but is not limited to, quartz, magnesium aluminum oxide or boron nitride, etc.

[0068] After the gradient coil 10 and the particle damper are packaged into one body by the base body 40, when the gradient coil 10 vibrates, the particle damper synchronously vibrates, and the particles 21 and the tube body 22, and the particles 21 and the particles 21 collide and rub, so as to realize the conversion of vibration energy into heat energy.

[0069] The above technical scheme, when the particle damper is arranged outside the gradient coil 10, the gradient coil 10 and the particle damper are packaged into one body by the base body 40, the structure is stable, so that the vibration energy of the gradient coil 10 can be smoothly transmitted to the particle damper, in addition, in the production process, the gradient coil 10 and the particle damper are packaged into one body first, and then the spiral winding process of the combination of the gradient coil 10 and the particle damper is performed, so that the spiral winding process of the gradient coil 10 and the particle damper is completed at the same time, which is beneficial to save the process and reduce the production cost.

[0070] In some embodiments of the present application, please refer to Figures 4 to 6 The gradient coil 10 further comprises a cooling structure 30, and the cooling structure 30 is thermally coupled with the gradient coil 10 and / or the particle damper.

[0071] The cooling structure 30 is used to remove the heat energy generated by the gradient coil 10 and the particle damper.

[0072] Optionally, the cooling structure 30 is thermally coupled with the gradient coil 10, for example, the cooling structure 30 is directly thermally coupled with the gradient coil 10 or is thermally coupled with the gradient coil 10 through a heat conductor, the heat energy on the gradient coil 10 is directly or through the heat conductor transferred to the cooling structure 30, and the heat energy on the particle damper is transferred to the cooling structure 30 through the gradient coil 10 or through the gradient coil 10 and the heat conductor. Alternatively, the cooling structure 30 is thermally coupled with the particle damper, for example, the cooling structure 30 is directly thermally coupled with the particle damper or is thermally coupled with the particle damper through a heat conductor, the heat energy on the particle damper is directly or through the heat conductor transferred to the cooling structure 30, and the heat energy on the gradient coil 10 is transferred to the cooling structure 30 through the particle damper or through the particle damper and the heat conductor. Alternatively, the cooling structure 30 is thermally coupled with both the gradient coil 10 and the particle damper, for example, the cooling structure 30 is directly thermally coupled with both the gradient coil 10 and the particle damper or is thermally coupled with both the gradient coil 10 and the particle damper through a heat conductor, the heat energy on both the gradient coil 10 and the particle damper is directly or through the heat conductor transferred to the cooling structure 30.

[0073] The above technical solution, by arranging the cooling structure 30, the heat energy generated by the gradient coil 10 and the particle damper can be removed by the cooling structure 30 in time, effectively avoiding the malfunction of the MRI equipment caused by the high temperature of the gradient coil assembly during operation.

[0074] In some embodiments of the present application, referring to Figure 1 and Figure 5 , the gradient coil 10 is provided with a cavity 11, the particle damper is arranged in the cavity 11, the cooling structure 30 is arranged outside the gradient coil 10, and the gradient coil 10 further comprises a base body 40, which encapsulates the gradient coil 10 and the cooling structure 30 as a whole.

[0075] Specifically, the cooling structure 30 comprises a cooling pipe and a cooling medium 31 filled in the cooling pipe, the cooling pipe is arranged in parallel and spaced apart from the gradient coil 10, and the length extension direction of the cooling pipe is the same as the length extension direction of the gradient coil 10, the cooling pipe is a heat-conducting pipe, for example, the cooling pipe is a metal pipe, the two ends of the cooling pipe are connected with an external heat exchange system, and the cooling medium 31 can circulate between the cooling pipe and the external heat exchange system to transfer the heat energy on the cooling pipe to the external heat exchange system for heat exchange. The cooling medium 31 can be, but is not limited to, water, air or refrigerant, etc.

[0076] The base body 40 has heat conduction performance, and is optionally made of a high molecular material, for example, epoxy resin or polyurethane, and is filled with a heat-conducting material, and the base body 40 can encapsulate the gradient coil 10 and the cooling structure 30 as a whole by pouring.

[0077] When the gradient coil 10 vibrates, the particle damper is driven to vibrate synchronously, the heat energy generated by the gradient coil 10 is transferred to the cooling pipe through the base 40, the heat energy generated by the particle damper is transferred to the cooling pipe through the gradient coil 10 and the base 40, the low-temperature cooling medium 31 absorbs the heat energy on the cooling pipe when flowing through the cooling pipe and becomes high-temperature cooling medium 31, the high-temperature cooling medium 31 exchanges heat when flowing through the external heat exchange system and becomes low-temperature cooling medium 31 again, and then returns to the cooling pipe, so as to repeatedly circulate, thereby continuously transferring the heat energy on the cooling pipe, so as to realize heat dissipation and cooling of the gradient coil assembly.

[0078] The above technical scheme sets the particle damper in the cavity 11, and then encapsulates the gradient coil 10 and the cooling structure 30 into an integrated whole by the base 40, so that the overall structure of the gradient coil assembly is relatively stable, and the heat energy generated by the gradient coil 10 and the particle damper can be transferred to the cooling structure 30 through the base 40, without the need to make great changes to the gradient coil 10, which is conducive to reducing production cost.

[0079] In some embodiments of the present application, referring to Figure 4 , the gradient coil 10 is provided with a cavity 11 and a cooling cavity 12, the particle damper is arranged in the cavity 11, and the cooling structure 30 is arranged in the cooling cavity 12.

[0080] Specifically, the cavity 11 and the cooling cavity 12 are arranged in parallel and spaced apart, and the length extension directions of the cavity 11 and the cooling cavity 12 are the same as the length extension direction of the gradient coil 10, wherein the two ends of the cooling cavity 12 are connected with the external heat exchange system, the cooling structure 30 includes a cooling medium 31, the cooling medium 31 is directly filled in the cooling cavity 12, and the cooling medium 31 can circulate between the cooling cavity 12 and the external heat exchange system to transfer the heat energy on the cooling cavity 12 to the external heat exchange system for heat exchange. The cooling medium 31 can be, but is not limited to, water, air or refrigerant.

[0081] When the gradient coil 10 vibrates, the particle damper is driven to vibrate synchronously, the heat energy generated by the gradient coil 10 is transferred to the inner wall of the cooling cavity 12, the heat energy generated by the particle damper is transferred to the inner wall of the cooling cavity 12 through the gradient coil 10, the low-temperature cooling medium 31 absorbs the heat energy on the inner wall of the cooling cavity 12 when flowing through the cooling cavity 12 and becomes high-temperature cooling medium 31, the high-temperature cooling medium 31 exchanges heat when flowing through the external heat exchange system and becomes low-temperature cooling medium 31 again, and then returns to the cooling cavity 12, so as to repeatedly circulate, thereby continuously transferring the heat energy on the cooling cavity 12, so as to realize heat dissipation and cooling of the gradient coil assembly.

[0082] The technical scheme has the advantages that the cavity 11 and the cooling cavity 12 are arranged in the gradient coil 10, the particle damper and the cooling structure 30 are arranged in the cavity 11 and the cooling cavity 12 respectively, the assembly is simple, the overall structure of the gradient coil assembly is compact, the particle damper and the cooling structure 30 do not occupy the space of the MRI equipment, the space occupied by the gradient coil assembly is effectively reduced, the cooling structure 30 can remove the heat energy of the gradient coil assembly in time and quickly, and the malfunction of the MRI equipment caused by the high temperature of the gradient coil assembly during operation is effectively avoided.

[0083] In some other embodiments of the present application, referring to Figure 6 , the particle damper and the cooling structure 30 are arranged outside the gradient coil 10, for example, the gradient coil 10, the particle damper and the cooling structure 30 are arranged in parallel and spaced apart from each other, and the gradient coil assembly further comprises a base body 40, which encapsulates the gradient coil 10, the particle damper and the cooling structure 30 as a whole. Alternatively, the particle damper comprises a tube body 22 and a plurality of particles 21, the tube body 22 is sleeved on the outer circumferential side of the gradient coil 10, and the plurality of particles 21 are movably arranged between the tube body 22 and the gradient coil 10, the cooling structure 30 comprises a cooling pipe and a cooling medium 31, the cooling pipe is sleeved on the outer circumferential side of the tube body 22, and the cooling medium 31 is filled between the cooling pipe and the tube body 22. Alternatively, the particle damper comprises a tube body 22 and a plurality of particles 21, the tube body 22 is sleeved on the outer circumferential side of the gradient coil 10, and the plurality of particles 21 are movably arranged between the tube body 22 and the gradient coil 10, the cooling structure 30 is arranged in parallel and spaced apart from the gradient coil 10, and the gradient coil assembly further comprises a base body 40, which encapsulates the gradient coil 10 with the particle damper and the cooling structure 30 as a whole.

[0084] Referring to Figures 7 to 9 , the gradient coil assembly provided by the embodiments of the present application comprises a gradient coil 10 and a damping structure 20, the damping structure 20 is connected with the gradient coil 10, and the damping structure 20 is a fluid damper.

[0085] Alternatively, the fluid damper is a viscous fluid damper, which converts vibration energy into heat energy by using the viscosity of the fluid 23. Specifically, the viscous fluid damper forms a viscous damping environment in the damper by using the fluid 23 with viscous characteristics such as rubber, oil and grease, for example, when the gradient coil 10 vibrates, the fluid 23 with viscous characteristics of the viscous fluid damper generates relative motion, and due to the viscosity and internal friction of the fluid 23 itself, the viscous fluid damper generates viscous force, thereby consuming the vibration energy of the gradient coil 10. In addition, the fluid damper can also be a liquid damper, a gas damper or a magnetorheological damper, etc.

[0086] In some embodiments, when the damping structure 20 is a fluid damper, the gradient coil 10 is provided with a cavity 11, i.e., the gradient coil 10 is a hollow structure, and the fluid damper is arranged in the cavity 11. For example, as shown in FIG. 1, the gradient coil 10 is provided with a cavity 11, and the fluid damper is arranged in the cavity 11. Figure 7 .

[0087] Specifically, the fluid damper includes a fluid 23, which is flowably filled in the cavity 11. Specifically, when the fluid damper is assembled with the gradient coil 10, the fluid 23 is filled into the cavity 11 from the end of the cavity 11, and then the end of the cavity 11 is sealed. In this way, when the gradient coil 10 vibrates, the fluid 23 of the fluid damper flows in the cavity 11 to generate internal friction, thereby converting part of the vibration energy of the gradient coil 10 into heat energy, achieving vibration and noise reduction of the gradient coil 10.

[0088] The above technical solution arranges the fluid damper in the cavity 11 of the gradient coil 10, which is simple to assemble and can make the structure between the fluid damper and the gradient coil 10 more compact, effectively avoiding the fluid damper from occupying additional space of the MRI device, thereby effectively reducing the space occupation of the gradient coil assembly. In addition, by flowably filling a plurality of fluids 23 in the cavity 11, the structure is simple, which is conducive to reducing production costs.

[0089] In some embodiments of the present application, please refer to Figure 8 , when the damping structure 20 is a fluid damper, the fluid damper can also be arranged outside the gradient coil 10.

[0090] By arranging the fluid damper outside the gradient coil 10, the structure of the gradient coil 10 itself is not affected.

[0091] Optionally, the fluid damper includes a tube body 22 and a fluid 23, the tube body 22 is sleeved on the outer circumferential side of the gradient coil 10, and the fluid 23 is flowably filled between the tube body 22 and the gradient coil 10. When the gradient coil 10 vibrates, the fluid 23 flows.

[0092] Optionally, the fluid damper includes a tube body 22 and a fluid 23, the fluid 23 is flowably filled in the tube body 22, the tube body 22 and the gradient coil 10 are arranged in parallel and spaced apart, and the gradient coil assembly further includes a base body 40, which encapsulates the gradient coil 10 and the fluid damper as a whole.

[0093] In some embodiments of the present application, please refer to Figure 5 , Figure 6 and Figure 9 , when the damping structure 20 is a fluid damper, the gradient coil 10 further includes a cooling structure 30, which is thermally coupled with the gradient coil 10 and / or the fluid damper.

[0094] The technical scheme above, by setting the cooling structure 30, the cooling structure 30 is used to remove the heat energy generated by the gradient coil 10 and the fluid damper, effectively avoiding the malfunction of the MRI equipment caused by the high temperature of the gradient coil assembly during operation.

[0095] In some embodiments of the present application, please refer to Figure 5 , when the damping structure 20 is a fluid damper, the gradient coil 10 is provided with a cavity 11, the fluid damper is arranged in the cavity 11, the cooling structure 30 is arranged outside the gradient coil 10, and the gradient coil 10 further comprises a base body 40, which encapsulates the gradient coil 10 and the cooling structure 30 as a whole.

[0096] Specifically, the fluid damper comprises a fluid 23, which is flowably filled in the cavity 11, as Figure 7 . The cooling structure 30 comprises a cooling pipe and a cooling medium 31 filled in the cooling pipe, the cooling pipe is arranged in parallel and spaced apart from the gradient coil 10, and the cooling medium 31 can circulate between the cooling pipe and the external heat exchange system to transfer the heat energy on the cooling pipe to the external heat exchange system for heat exchange.

[0097] When the gradient coil 10 vibrates, the fluid 23 in the hollow cavity 11 is driven to flow, the heat energy generated by the gradient coil 10 is transmitted to the cooling pipe through the base body 40, the heat energy generated by the fluid 23 is transmitted to the cooling pipe through the gradient coil 10 and the base body 40, and the low-temperature cooling medium 31 absorbs the heat energy on the cooling pipe when flowing through the cooling pipe to become a high-temperature cooling medium 31, the high-temperature cooling medium 31 is heat-exchanged when flowing through the external heat exchange system to become a low-temperature cooling medium 31 again, and then returns to the cooling pipe, so as to continuously transfer the heat energy on the cooling pipe.

[0098] In some embodiments of the present application, please refer to Figure 9 , when the damping structure 20 is a fluid damper, the gradient coil 10 is provided with a cavity 11 and a cooling cavity 12, the cavity 11 and the cooling cavity 12 are arranged in parallel and spaced apart, the fluid damper is arranged in the cavity 11, and the cooling structure 30 is arranged in the cooling cavity 12.

[0099] Specifically, the fluid damper comprises a fluid 23, which is flowably filled in the cavity 11, the two ends of the cooling cavity 12 are connected with the external heat exchange system, the cooling structure 30 comprises a cooling medium 31, which is flowably filled in the cooling cavity 12, and the cooling medium 31 can circulate between the cooling cavity 12 and the external heat exchange system to transfer the heat energy on the cooling cavity 12 to the external heat exchange system for heat exchange.

[0100] In this way, when the gradient coil 10 vibrates, the fluid 23 flows in the cavity 11, the heat energy generated by the gradient coil 10 is transferred to the inner wall of the cooling cavity 12, the heat energy generated by the fluid 23 is transferred to the inner wall of the cooling cavity 12 through the gradient coil 10, and the low-temperature cooling medium 31 flowing through the cooling cavity 12 absorbs the heat energy on the inner wall of the cooling cavity 12 to become a high-temperature cooling medium 31. The high-temperature cooling medium 31 exchanges heat when flowing through the external heat exchange system and becomes a low-temperature cooling medium 31 again, and then returns to the cooling cavity 12. Thus, the heat energy on the cooling cavity 12 is continuously transferred.

[0101] The technical solution described above has the following advantages. The cavity 11 and the cooling cavity 12 are arranged in the gradient coil 10, and the fluid damper and the cooling structure 30 are arranged in the cavity 11 and the cooling cavity 12, respectively. Therefore, the assembly is simple, and the overall structure of the gradient coil assembly is compact. The fluid damper and the cooling structure 30 do not occupy additional space of the MRI device, thereby effectively reducing the space occupied by the gradient coil assembly. In addition, the cooling structure 30 can timely and quickly remove the heat energy of the gradient coil assembly, thereby effectively preventing the MRI device from malfunctioning due to the high temperature of the gradient coil assembly.

[0102] In some other embodiments of the present application, the fluid damper and the cooling structure 30 are arranged outside the gradient coil 10. For example, the gradient coil 10, the fluid damper, and the cooling structure 30 are arranged side by side and spaced apart from each other. The gradient coil assembly further includes a base body 40 that encapsulates the gradient coil 10, the fluid damper, and the cooling structure 30 as a whole. Alternatively, the fluid damper includes a pipe body 22 and a fluid 23. The pipe body 22 is sleeved on the outer circumferential side of the gradient coil 10, and the fluid 23 is movably filled between the pipe body 22 and the gradient coil 10. For example, Figure 8 The cooling structure 30 includes a cooling pipe and a cooling medium 31. The cooling pipe is sleeved on the outer circumferential side of the pipe body 22, and the cooling medium 31 is movably filled between the cooling pipe and the pipe body 22. Alternatively, the fluid damper includes a pipe body 22 and a fluid 23. The pipe body 22 is sleeved on the outer circumferential side of the gradient coil 10, and the fluid 23 is movably filled between the pipe body 22 and the gradient coil 10. The cooling structure 30 is arranged side by side and spaced apart from the gradient coil 10. The gradient coil assembly further includes a base body 40 that encapsulates the gradient coil 10 with the fluid damper and the cooling structure 30 as a whole.

[0103] The gradient coil assembly provided in the embodiments of the present application includes a gradient coil 10 and a damping structure 20. The gradient coil 10 is provided with a cavity 11, and the damping structure 20 is arranged in the cavity 11. The damping structure 20 can be a particle damper, a fluid damper, or a viscoelastic damper. It can be understood that when the damping structure 20 is arranged in the cavity 11 of the gradient coil 10, the damping structure 20 can be but is not limited to a particle damper, a fluid damper, or a viscoelastic damper.

[0104] The viscoelastic damper is made of viscoelastic material, which can be but is not limited to asphaltic damping material, rubber damping material, or resin damping material, etc. The viscoelastic damper mainly converts kinetic energy generated by vibration into heat energy through the viscous and elastic properties of the viscoelastic material, so as to achieve the purpose of shock absorption and noise reduction. For example, when the gradient coil 10 vibrates, the elastic material of the viscoelastic damper deforms, and in this process, due to the strain lagging behind the stress of the elastic material, part of the vibration energy of the gradient coil 10 is converted into heat energy due to the internal friction between the elastic materials.

[0105] In some embodiments, referring to Figures 1 to 6 , the gradient coil 10 further comprises a cooling structure 30, which is thermally coupled with the gradient coil 10.

[0106] The cooling structure 30 is thermally coupled with the gradient coil 10 in the manner as exemplified above when the damping structure 20 is arranged in the cavity 11.

[0107] The present application also provides a magnetic resonance imaging device, which comprises a magnet and the gradient coil assembly of any one of the above embodiments, and the gradient coil assembly is arranged in the magnet.

[0108] Compared with the prior art, the magnetic resonance imaging device provided by the present application adopts the gradient coil assembly provided by the present application, connects the damping structure 20 with the gradient coil 10, and the damping structure 20 is used to convert part of the vibration energy of the gradient coil 10 into heat energy, so as to realize vibration reduction of the gradient coil 10. When the damping structure 20 adopts the particle damper, part of the vibration energy of the gradient coil 10 is transmitted to the particle damper to drive the particles 21 of the particle damper to vibrate and the particles 21 collide and rub with each other, so as to quickly and efficiently convert the vibration energy of the gradient coil 10 into heat energy to consume the vibration energy, thereby reducing the vibration of the gradient coil 10. When the damping structure 20 adopts the fluid damper, the fluid 23 of the damping structure 20 flows to generate internal friction when the gradient coil 10 vibrates, so as to convert part of the vibration energy of the gradient coil 10 into heat energy, thereby realizing vibration reduction and noise reduction of the gradient coil 10, effectively reducing noise and ensuring the reliability of the operation of the MRI device.

[0109] The above only describes the preferred embodiments of the present application and should not be used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A gradient coil assembly, characterized by, The gradient coil (10) is provided with a cavity (11), and the fluid damper is arranged in the cavity (11). The gradient coil assembly further comprises an isolation layer (50) arranged in the cavity (11) and located between the inner wall of the cavity (11) and the particle damper. The gradient coil assembly further comprises a cooling structure (30) which is thermally coupled with the gradient coil (10) and / or the particle damper. The cooling structure (30) is arranged outside the gradient coil (10), and the gradient coil assembly further comprises a base body (40) which encapsulates the gradient coil (10) and the cooling structure (30) as a whole; or, the gradient coil (10) is provided with a cavity (11) and a cooling cavity (12), the particle damper is arranged in the cavity (11), and the cooling structure (30) is arranged in the cooling cavity (12); or, the gradient coil (10), the particle damper and the cooling structure (30) are arranged in parallel and spaced apart from each other, and the gradient coil assembly further comprises a base body (40) which encapsulates the gradient coil (10), the particle damper and the cooling structure (30) as a whole.

2. The gradient coil assembly of claim 1, wherein: The gradient coil (10) is provided with a cavity (11), and the fluid damper is arranged in the cavity (11).

3. The gradient coil assembly of claim 2, wherein: The gradient coil assembly is arranged in the magnet.

4. The gradient coil assembly of claim 1, wherein: The gradient coil assembly is arranged in the magnet.

5. The gradient coil assembly of claim 4, wherein: ​ 6. A gradient coil assembly characterized by, ​ ​ ​ ​ 7. A magnetic resonance imaging apparatus, characterized by ​

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