Body coil and magnetic resonance equipment comprising same

Abstract

The utility model provides a body coil and magnetic resonance equipment comprising the same, the body coil is used for being arranged in a gradient coil of the magnetic resonance equipment, the body coil comprises a patient examination cavity, and a vacuum area is arranged in the wall body of the body coil; and a closed cavity is formed in the wall body of the body coil and is used for forming a vacuum area and / or accommodating a filling body with a vacuum area. By improving the sound insulation and heat insulation performance of the body coil, noise and heat felt by a patient can be reduced, and then the comfort level and the experience degree of the patient are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic resonance equipment, in particular to a body coil and a magnetic resonance equipment including the body coil. Background Art

[0002] In a magnetic resonance equipment, a gradient coil is arranged in a main magnet, and a body coil is located in the gradient coil. During the operation of magnetic resonance, a scanning bed will carry a patient to move in the body coil for scanning. During the scanning process, the gradient coil vibrates due to the electromagnetic force and thus generates relatively large noise. At the same time, eddy currents are also generated when the gradient coil is working. These eddy currents will generate relatively large heat in a conductor. These noise and heat will be conducted to the adjacent body coil, and then transmitted to the patient on the scanning bed through the body coil, reducing the comfort and experience of the patient. Summary of the Utility Model

[0003] In view of the above disadvantages of the prior art, the utility model provides a body coil and a magnetic resonance equipment including the body coil. By improving the sound insulation and heat insulation performance of the body coil, the noise and heat felt by the patient can be reduced, thereby improving the comfort and experience of the patient.

[0004] To achieve the above object and other related objects, the utility model provides a body coil for being arranged inside a gradient coil of a magnetic resonance equipment. The body coil includes a patient examination cavity, and a vacuum area is arranged in the wall body of the body coil; and a sealed cavity is formed in the wall body of the body coil, and the cavity is used for forming a vacuum area and / or accommodating a filling body having a vacuum area.

[0005] In an example of the body coil of the utility model, the cavity is provided with an air extraction port for pumping air.

[0006] In an example of the body coil of the utility model, the filling body includes a plurality of sound insulation parts and / or a plurality of heat insulation parts, and at least part of the sound insulation parts and / or at least part of the heat insulation parts have a vacuum area.

[0007] In an example of the body coil of the utility model, the sound insulation part and / or the heat insulation part is a vacuum ball.

[0008] In an example of the body coil of the utility model, the diameter of the vacuum ball corresponds to the sound wave wavelength corresponding to the noise peak value of the gradient coil.

[0009] In an example of the body coil of the utility model, the body coil includes a first housing and a second housing surrounding the outer periphery of the first housing, and the first housing and the second housing are connected to form a cavity.

[0010] In an example of the body coil of the utility model, the surface of the first housing and / or the second housing facing the cavity side is provided with a convex part.

[0011] In an example of the body coil of the present utility model, along the axial direction of the body coil, the body coil includes a first body and a second body. The first body and the second body are arranged axially along the body coil and are butt-jointed to enclose a cavity. The first body and the second body form a docking interface at the butt-joint, and the first body and the second body form an overlapping area for laser welding at the docking interface.

[0012] In an example of the body coil of the present utility model, an adhesive layer is provided in the overlapping area. The two sides of the adhesive layer are respectively adhered to the first body and the second body, and the adhesive layer is configured to be melted during laser welding.

[0013] In an example of the body coil of the present utility model, the first body and the second body are provided with mutually matching positioning and plugging structures to guide the first body and the second body to butt-joint to form a docking interface.

[0014] In an example of the body coil of the present utility model, the positioning and plugging structure includes a boss and a counterbore matching with the boss. The boss is provided on one of the first body and the second body, and the counterbore is provided on the other of the first body and the second body.

[0015] In an example of the body coil of the present utility model, at the docking interface, one of the first body and the second body that is exposed to the outside of the body coil is made of a transparent material, and the other is made of an absorbent material; and / or; one of the two that is exposed to the patient examination cavity side is made of a transparent material, and the other is made of an absorbent material.

[0016] In an example of the body coil of the present utility model, the body coil includes a first body, a second body and a connecting ring. The first body and the second body are arranged axially along the body coil and are connected by the connecting ring to form a cavity. The melting point of the connecting ring is greater than the melting points of the first body and the second body.

[0017] The present utility model also proposes a magnetic resonance device, including: the body coil of any one of the above embodiments.

[0018] The present utility model proposes a body coil for being arranged inside the gradient coil of a magnetic resonance device. The body coil includes a patient examination cavity, and a vacuum area is arranged in the wall body of the body coil. Since the vacuum area does not have the conditions for heat conduction and convection, the heat generated by the external gradient coil can be reduced from being transferred into the patient examination cavity, improving the heat insulation performance of the body coil; at the same time, since sound propagation requires a medium and there is no medium in a vacuum, the setting of the vacuum area can also reduce the noise generated by the external gradient coil from being transferred into the patient examination cavity, improving the sound insulation performance of the body coil, thereby improving the comfort and experience of the patient during the scanning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 Schematic diagram of the installation positions of the magnetic resonance device and the body coil in an embodiment of the present invention.

[0021] Figure 2 Schematic diagram of the overall structure of the body coil in an embodiment of the present invention.

[0022] Figure 3 Schematic diagram of the structure where the cavity of the body coil wall body is a vacuum area in an embodiment of the present invention.

[0023] Figure 4 Schematic diagram of the structure where a filling body with a vacuum area is accommodated in the cavity of the body coil wall body in an embodiment of the present invention.

[0024] Figure 5 Schematic diagram of the structure where a cavity is formed in the body coil in an embodiment of the present invention;

[0025] Figure 6 Schematic diagram of the structure where the first housing and the second housing are provided with convex portions in an embodiment of the present invention;

[0026] Figure 7 Schematic diagram of the structure where the first housing and the second housing are provided with convex portions in another embodiment of the present invention;

[0027] Figure 8 Schematic diagram of the connection structure between the first body and the second body in an embodiment of the present invention;

[0028] Figure 9 For Figure 8 Partial enlarged view of area A in;

[0029] Figure 10 Schematic diagram of the connection structure between the first body and the second body in another embodiment of the present invention.

[0030] Element number description

[0031] 10. Body coil; 101. Patient examination cavity; 102. Vacuum area; 103. Cavity; 1031. First cavity; 1032. Second cavity; 1033. Air extraction port; 104. First housing; 105. Second housing; 106. Convex part; 107. First body; 1071. First inner shell; 1072. First outer shell; 108. Second body; 1081. Second inner shell; 1082. Second outer shell; 109. Support part; 11. Docking interface; 111. First docking interface; 112. Second docking interface; 12. Overlap area; 13. Adhesive layer; 14. Positioning and plugging structure; 141. First boss; 142. Second boss; 143. First counterbore; 144. Second counterbore; 15. Connecting ring; 16. Filling body; 17. Sound insulation part; 18. Heat insulation part; 20. Magnetic resonance equipment; 21. Main magnet; 22. Gradient coil. Detailed implementation manners

[0032] The following uses specific specific examples to illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. It should also be understood that the terms used in the embodiments of the present utility model are for describing specific specific implementation manners, rather than limiting the protection scope of the present utility model. The test methods without specific conditions noted in the following embodiments are usually carried out according to conventional conditions or according to the conditions recommended by each manufacturer.

[0033] When the embodiments give a numerical range, it should be understood that unless otherwise stated in the present utility model, any numerical value between the two endpoints of each numerical range and any one of the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present utility model, based on the understanding of those skilled in the art of the prior art and the description of the present utility model, can also use any methods, devices, and materials of the prior art similar or equivalent to the methods, devices, and materials described in the embodiments of the present utility model to implement the present utility model.

[0034] It should be noted that the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration, rather than used to limit the scope of implementation of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope of implementation of the present utility model.

[0035] Please refer to Figures 1 to 10, the present utility model provides a body coil 10 for being disposed inside a gradient coil 22 of a magnetic resonance device 20. By providing a vacuum area 102 inside the wall body of the body coil 10, the sound insulation and heat insulation performance of the body coil 10 can be improved, thereby improving the comfort and experience of the patient during the scanning process.

[0036] Please refer to Figures 1 to 4 , the body coil 10 includes a patient examination cavity 101. The shape of the body coil 10 can be cylindrical, square cylindrical, polyhedral, etc., which is specifically determined by the installation dimensions of the body coil 10 and the requirements of the detection space. Preferably, in this embodiment, the body coil 10 is cylindrical, which is convenient for the manufacture of the body coil 10 and the positioning and installation with the magnetic resonance device 20. The patient examination cavity 101 is located in the central area of the body coil 10. The length extension direction of the patient examination cavity 101 is consistent with the axial direction of the body coil 10. Both ends of the patient examination cavity 101 communicate with the outside. The patient examination cavity 101 can be coaxially arranged with the body coil 10 or non-coaxially arranged. Preferably, the patient examination cavity 101 is coaxially arranged with the body coil 10. A vacuum area 102 is provided inside the wall body of the body coil 10. The vacuum area 102 can be an annular cavity surrounding the wall body of the body coil 10, or multiple local cavities dispersed in the wall body of the body coil 10, etc. The vacuum area 102 can be a regular toroidal structure or an irregular special-shaped structure. In this embodiment, the specific shape and area size of the vacuum area 102 are not limited. It should be noted that a support part 109 for supporting the scanning bed can also be provided on the side of the wall body of the body coil 10 facing the patient examination cavity 101. Since the support part 109 needs to have sufficient support strength, the area at the position of the support part 109 does not include the vacuum area 102.

[0037] In this embodiment, a vacuum area 102 is provided inside the wall body of the body coil 10. Since the vacuum area 102 does not have the conditions for heat conduction and convection, it can reduce the transfer of heat generated by the external gradient coil 22 to the patient examination cavity 101 and improve the heat insulation performance of the body coil 10. At the same time, since sound propagation requires a medium and there is no medium in a vacuum, the setting of the vacuum area 102 can also reduce the transfer of noise generated by the external gradient coil 22 to the patient examination cavity 101 and improve the sound insulation performance of the body coil 10, thereby improving the comfort and experience of the patient during the scanning process.

[0038] Please refer to Figure 3 and Figure 5, in an example of the body coil 10 of the present utility model, a sealed cavity 103 is formed within the wall of the body coil 10, and the cavity 103 is used to form a vacuum area 102. There are various ways to form the cavity 103. For example, injection molding, or welding multiple plates together, etc. The way the cavity 103 forms the vacuum area 102 can be that the body coil 10 is cast in a vacuum environment to form the vacuum area 102, or the body coil 10 is manufactured under normal pressure and then the cavity 103 is evacuated to form the vacuum area 102, etc. The cavity 103 being used to form the vacuum area 102 can mean that the entire cavity 103 is the vacuum area 102, or the cavity 103 includes multiple separately arranged cavity units, and one or more of these cavity units is the vacuum area 102. Preferably, in this embodiment, the entire cavity 103 is the vacuum area 102, which facilitates mass production and saves the manufacturing cost of the body coil 10. By making the cavity 103 form the vacuum area 102, a relatively large area of the vacuum area 102 can be obtained on the body coil 10, thereby greatly improving the sound insulation and heat insulation effects of the body coil 10.

[0039] In some other embodiments, please refer to Figure 4 , the cavity 103 is used to accommodate a filling body 16 having a vacuum area 102. The cavity 103 itself can be the vacuum area 102 or not, and no specific limitation is made in this embodiment. The filling body 16 can be a sphere, a cube, or an irregular shaped body, etc., any structure having a vacuum area 102. The filling body 16 can fill the entire cavity 103 or only part of the space of the cavity 103. Preferably, in order to obtain a relatively large vacuum area 102 in the cavity 103, in this embodiment, the filling body 16 fills the entire space of the cavity 103. In this embodiment, by filling the cavity 103 with the filling body 16 having a vacuum area 102, on the one hand, when the cavity 103 itself is the vacuum area 102, the sound insulation and heat insulation effects of the body coil 10 can be further improved. On the other hand, it can also reduce the vacuum degree requirement of the cavity 103 while ensuring that the body coil 10 has satisfactory sound insulation and heat insulation effects, thereby reducing the manufacturing difficulty of the body coil 10, improving the production efficiency of the body coil 10, and reducing the production cost.

[0040] Please refer to Figure 4, in an example of the body coil 10 of the present utility model, the filling body 16 includes a plurality of sound insulation parts 17 and a plurality of heat insulation parts 18, and at least part of the sound insulation parts 17 and heat insulation parts 18 have a vacuum area 102. The filling volumes of the sound insulation parts 17 and heat insulation parts 18 in the cavity 103 can be equal or unequal; the shapes of the sound insulation parts 17 and heat insulation parts 18 can also be set to be the same or different. Both the sound insulation parts 17 and heat insulation parts 18 in the cavity 103 can have a vacuum area 102; it can also be that some of the sound insulation parts 17 or some of the heat insulation parts 18 have a vacuum area 102, and some of the sound insulation parts 17 and heat insulation parts 18 do not have a vacuum area 102. The material of the sound insulation part 17 can be mineral wool, polystyrene foam, glass fiber, aerogel, etc., and the material of the heat insulation part 18 can be polyvinyl chloride, polypropylene, silica gel, aerogel, etc. In this embodiment, since the filling body 16 includes the sound insulation part 17 and the heat insulation part 18, and the sound insulation part 17 and the heat insulation part 18 have a vacuum area 102, this can ensure that the body coil 10 can simultaneously have good sound insulation performance and heat insulation performance.

[0041] In another embodiment, the filling body 16 can also be only one of the sound insulation part 17 and the heat insulation part 18. In this way, on the premise that the cavity 103 forms a vacuum area 102, the sound insulation performance or heat insulation performance of the body coil 10 can be further improved specifically.

[0042] Although in this application, when the sound insulation part 17 and the heat insulation part 18 have a vacuum area 102, the specific shapes of the sound insulation part 17 and the heat insulation part 18 are not limited, but preferably, please refer to Figure 3 and Figure 4 , in an example of the body coil 10 of the present utility model, both the sound insulation part 17 and the heat insulation part 18 are vacuum balls. The size of the vacuum ball of the sound insulation part 17 and the diameter of the vacuum ball of the heat insulation part 18 can be equal or unequal, which is specifically determined by the filling size requirements of the cavity 103. The vacuum ball can be a vacuum glass ball, or any vacuum spherical structure such as a vacuum aerogel ball that has sound insulation and heat insulation effects. In this embodiment, by setting the sound insulation part 17 and the heat insulation part 18 as a vacuum ball structure, this can facilitate the molding manufacture and mass production of the filling body 16, and at the same time can also facilitate the filling of the filling body 16 in the cavity 103 and improve the filling efficiency. It should be noted that in some other embodiments, it can also be that one of the sound insulation part 17 or the heat insulation part 18 is a vacuum ball structure, which can also facilitate the production and filling of the filling body 16 to a certain extent.

[0043] On the premise that the diameter of the vacuum sphere meets the filling diameter requirement of the cavity 103, the specific diameter size of the vacuum sphere is not limited in this application. Preferably, in an example of the body coil 10 of the present utility model, the diameter of the vacuum sphere corresponds to the sound wave wavelength corresponding to the gradient coil 22 at the noise peak. Specifically, the diameter of the vacuum sphere corresponding to the sound wave wavelength corresponding to the gradient coil 22 at the noise peak may refer to a linear correspondence, a non-linear correspondence, or a composite function correspondence between the diameter of the vacuum sphere and the sound wave wavelength corresponding to the gradient coil 22 at the noise peak, as long as a corresponding relationship can be formed between the diameter of the vacuum sphere and the sound wave wavelength corresponding to the gradient coil 22 at the noise peak.

[0044] Preferably, in this embodiment, the "mean free path" theory is introduced to guide the design of the vacuum sphere diameter. Since sound waves are longitudinal waves (generally in air), there needs to be some interaction between adjacent "air" molecules (a mixture mainly composed of N2, O2, CO2, and Ar). When the distance between adjacent molecules is longer than the propagation distance of the sound wave, the sound amplitude will drop sharply in this case. Among them, the mean free path refers to the average value of each free path that gas molecules may pass through between two consecutive collisions. The mean free path can be calculated according to the following formula: where k B is the Boltzmann constant, p is the gas pressure, T is the absolute temperature. d is the critical diameter of the spherical particle. From the above formula, it can be seen that when the pressure and temperature are known, as long as the size of the mean free path l is known, the critical diameter d of the spherical particle can be calculated. Since the conversion of sound waves will be greatly restricted when the mean free path l is greater than the sound wave length, as long as the diameter of the vacuum sphere is greater than the critical diameter d of the above spherical particle, the vacuum sphere can achieve a targeted noise reduction effect on the set sound wave wavelength. Since in the existing magnetic resonance device 20, the noise emitted by the gradient coil 22 usually peaks between 600 Hz and 700 Hz, according to the formula: v = f·λ, where ν is the wave speed, the unit is usually meters per second (m / s) for electromagnetic waves, the wave speed is the speed of light, approximately 3×10 8 meters per second; f is the frequency, the unit is hertz (Hz); λ is the wavelength, the unit is meters (m), the sound wave length of the target spectrum to be shielded by the body coil 10, that is, the set sound wave wavelength, can be calculated. By setting it this way, on the premise of ensuring that the diameter size of the vacuum sphere can meet the filling size of the cavity 103, the diameter of the vacuum sphere can be further optimized through the above formula, which can not only greatly improve the noise reduction effect of the body coil 10, that is, improve the sound insulation performance of the body coil 10, but also, according to the relationship between the mean free path and the sound wave wavelength, control the sound amplitude of the target frequency, and in addition, reduce the heat conducted from the gradient coil 22 to the body coil 10, improving the heat insulation effect of the body coil 10.

[0045] Please refer to Figure 5 In an example of the body coil 10 of the present utility model, the body coil 10 includes a first housing 104 and a second housing 105 disposed around the outer periphery of the first housing 104. The first housing 104 and the second housing 105 are connected to form a cavity 103. The connection manner between the first housing 104 and the second housing 105 can be integrally injection-molded connection or laser welding connection. The first housing 104 and the second housing 105 can be coaxially arranged or non-coaxially arranged. Preferably, in this embodiment, for the convenience of molding and processing, the first housing 104 and the second housing 105 are coaxially arranged. The cavity 103 formed between the first housing 104 and the second housing 105 can be a cavity 103 with a constant cross-section or a cavity 103 with a non-constant cross-section. Preferably, for the convenience of the molding and manufacturing of the cavity 103, in this embodiment, the two surfaces of the first housing 104 and the second housing 105 facing each other are both cylindrical surface structures, so that the cavity 103 forms a cylindrical ring structure with a constant cross-section. By setting the body coil 10 as the structure of the first housing 104 and the second housing 105, the molding of the cavity 103 can be facilitated, and the mass production of the body coil 10 can be facilitated.

[0046] Please refer to Figure 6 and Figure 7 In an example of the body coil 10 of the present utility model, a convex portion 106 is provided on the surface of the first housing 104 facing the cavity 103. The convex portion 106 can be an annular structure arranged along the circumferential direction of the cavity 103 or a plurality of block structures dispersed on the surface of the first housing 104. The axial cross-sectional shape of the convex portion 106 can be any shape such as a rectangle, a trapezoid, a triangle, etc. Under the requirement of meeting the spatial size of the cavity 103, the shape, the setting quantity and the arrangement manner of the convex portion 106 on the first housing 104 are not limited. By providing the convex portion 106, on the one hand, the local support strength and support stiffness of the first housing 104 at the relative position with the cavity 103 can be improved, and then the overall support strength and stiffness of the body coil 10 can be improved; on the other hand, the displacement amount of the filling body 16 in the cavity 103 can be reduced, so it is beneficial to the uniform arrangement of the filling body 16 and the uniformity of the sound insulation and heat insulation effect of the body coil 10. It should be noted that in another embodiment, the convex portion 106 can also be provided on the surface of the second housing 105 facing the cavity 103. In other embodiments, the convex portion 106 can also be provided on the surfaces of both the first housing 104 and the second housing 105 facing the cavity 103. Such a setting can also achieve the beneficial effects in the above embodiments.

[0047] Please refer to Figure 8 and Figure 9, in an example of the body coil 10 of the present utility model, along the axial direction of the body coil 10, the body coil 10 includes a first body 107 and a second body 108. The first body 107 and the second body 108 are arranged axially along the body coil 10 and are butt-jointed to enclose a cavity 103. The first body 107 and the second body 108 may be symmetrically arranged or asymmetrically arranged. The first body 107 and the second body 108 may both be provided with a sealed cavity 103, or a sealed cavity 103 may be formed after butt-joint connection. Preferably, in this embodiment, along the axial direction of the body coil 10, the first body 107 and the second body 108 are substantially symmetrically arranged, and a sealed cavity 103 is formed after the first body 107 and the second body 108 are butt-jointed. The cavity 103 itself may be a vacuum area 102, or the cavity 103 may be a non-vacuum area 102, and a filler 16 with a vacuum area 102 is filled inside the cavity 103. Preferably, in this embodiment, the cavity 103 itself is a vacuum area 102, and a filler 16 may or may not be provided inside the cavity 103. In order to ensure the vacuum degree of the cavity 103, an air extraction port 1033 may also be provided at the end of the cavity 103, so that after the first body 107 and the second body 108 are butt-jointed, the air inside the cavity 103 is sucked away through the air extraction port 1033 to form a vacuum area 102 in the cavity 103. The first body 107 and the second body 108 are butt-jointed to form a butt-joint interface 11, and an overlapping area 12 for laser welding is formed at the butt-joint interface 11 between the first body 107 and the second body 108. The butt-joint interface 11 may protrude from the first housing 104 or the second housing 105, or may be flush with the outer side surfaces of the first housing 104 and the second housing 105. The overlapping area 12 formed by the butt-joint interface 11 may be a toroidal surface structure arranged along the circumferential direction of the body coil 10, or a toroidal surface structure with an irregular serrated edge, etc. As long as the requirements for the laser welding area are met, the shape and area size of the overlapping area 12 are not limited.

[0048] Considering the assembly requirements, when the first body 107 and the second body 108 are butt-jointed to form an overlapping area 12, there is often a radial gap between the first body 107 and the second body 108 at the butt-joint interface 11. This gap will affect the welding process requirements between the first body 107 and the second body 108, and is likely to cause the phenomenon of false soldering and leakage of soldering, thereby affecting the welding quality. In view of this, in an example of the body coil 10 of the present utility model, please refer to Figure 8 and Figure 9, an overlapping region 12 is provided with an adhesive layer 13. The two sides of the adhesive layer 13 are respectively adhered to the first body 107 and the second body 108. The adhesive layer 13 is configured to be melted by laser welding. The area of the adhesive layer 13 at least covers the overlapping region 12. The adhesive layer 13 can be provided with one layer or multiple layers, which is specifically determined according to the size of the radial gap. The adhesive layer 13 can be a solid adhesive layer 13 or a gel-like adhesive layer 13, as long as it can be coated on the overlapping region 12 to play an adhesive role on the first body 107 and the second body 108. The material of the adhesive layer 13 is not specifically limited. For example, it can be a phenolic resin, a phenolic resin, or a butyl rubber, etc., which has adhesive properties and can be melted by laser welding. In this embodiment, by providing the adhesive layer 13 in the overlapping region 12, the radial gap existing in the overlapping region 12 can be eliminated, the welding quality can be improved, and the sealing performance of the welded connection at the docking interface 11 can also be improved.

[0049] Please refer to Figure 8 , in an example of the body coil 10 of the present utility model, the first body 107 and the second body 108 are provided with mutually matching positioning and plugging structures 14 to guide the docking of the first body 107 and the second body 108 to form a docking interface 11. There are various choices for the positioning and plugging structure 14. For example, it can be a boss and a counterbore structure respectively provided on the first body 107 and the second body 108, and the boss is plugged into the counterbore to form a plugging connection; it can also be a flange provided between the first body 107 and the second body 108, and plugging holes for plugging the ends of the first body 107 and the second body 108 are respectively provided at both ends of the flange, thereby forming a plugging connection between the first body 107 and the second body 108; it can also be that a necking and flaring structure are respectively provided at the opposite ends of the first body 107 and the second body 108, and the necking is plugged into the flaring to achieve the positioning and plugging connection between the first body 107 and the second body 108. By providing the positioning and plugging structure 14, the positioning connection accuracy and connection efficiency between the first body 107 and the second body 108 can be improved, which is beneficial to the mass production of the body coil 10.

[0050] Preferably, please refer to Figure 8, in an example of the body coil 10 of the present utility model, the positioning and plugging structure 14 includes a boss and a counterbore that matches the boss. The boss is provided at the end of the first body 107 facing the second body 108, and the counterbore is provided at the end of the second body 108 facing the first body 107. The outer diameter of the boss matches the aperture of the counterbore, and the height of the boss's tabletop matches the depth of the counterbore. By using the boss and counterbore structure, when the first body 107 and the second body 108 are plugged and connected, the boss is correspondingly inserted into the counterbore, which can simultaneously achieve the positioning connection of the first body 107 and the second body 108 in both the axial and radial directions, further ensuring the docking accuracy between the first body 107 and the second body 108. In other embodiments, it can also be that the boss is provided at the end of the second body 108 facing the first body 107, and the counterbore is provided at the end of the first body 107 facing the second body 108. Such a setting can also achieve the beneficial effects of the above embodiments.

[0051] Please refer to Figure 8 and Figure 9 , in an example of the body coil 10 of the present utility model, at the docking interface 11, one of the first body 107 and the second body 108 that is exposed to the outside of the body coil 10 is made of a transparent material, and the other is made of a light-absorbing material. Specifically, it can be that the first body 107 covers the second body 108 to form an overlapping area 12, the first body 107 is exposed to the outside of the body coil 10, the material of the first body 107 is a transparent material, and the material of the second body 108 is a light-absorbing material. It can also be that the second body 108 covers the first body 107 to form an overlapping area 12, the second body 108 is exposed to the outside of the body coil 10, the material of the second body 108 is a transparent material, and the material of the first body 107 is a light-absorbing material. The transparent material can be any transparent material that can allow the welding laser to pass through with less energy loss, such as polycarbonate, polymethyl methacrylate, polymethyl methacrylate, etc. The light-absorbing material can be any material that can absorb the laser energy and produce a molten state during laser welding, such as ordinary black plastic or other modified light-absorbing plastics. With such a setting, laser welding can be applied to the overlapping area 12 outside the body coil 10. During the entire welding process, the laser head is always located outside the body coil 10, which is convenient for controlling the welding posture of the laser head. At the same time, it is also convenient to observe the welding quality of the overlapping area 12 at any time and detect welding defects in a timely manner.

[0052] In some other embodiments, one of the first body 107 and the second body 108 that is exposed to the side of the patient examination cavity 101 may be made of a transparent material, and the other may be made of a light-absorbing material. With this arrangement, during laser welding, the laser head is located inside the patient examination cavity 101 and welds the overlapping area 12 from the inside. In this way, during the laser welding process, the body coil 10 can be kept stationary, and the laser head inside the patient examination cavity 101 rotates circumferentially, enabling the entire circumferential welding of the overlapping area 12, thereby simplifying the positioning structure during the welding of the body coil 10.

[0053] Specifically, please refer to Figure 8 and Figure 9, in the first embodiment of the present embodiment, the first body 107 includes a first inner shell 1071 and a first outer shell 1072. The first inner shell 1071 is connected to the first outer shell 1072 and forms a first cavity 1031; the second body 108 includes a second inner shell 1081 and a second outer shell 1082. The second inner shell 1081 is connected to the second outer shell 1082 and forms a second cavity 1032. The first body 107 is butt-joined to the second body 108, and the first cavity 1031 and the second cavity 1032 are communicated with each other. The first inner shell 1071 is provided with a first boss 141, and the second inner shell 1081 is provided with a first counterbore 143; the first outer shell 1072 is provided with a second boss 142, and the second outer shell 1082 is provided with a second counterbore 144. The first boss 141 is inserted into the first counterbore 143 to achieve the butt-joining connection between the first inner shell 1071 and the second inner shell 1081 and form a first docking interface 111. The second boss 142 is inserted into the second counterbore 144 to achieve the butt-joining connection between the first outer shell 1072 and the second outer shell 1082 and form a second docking interface 112. At the second docking interface 112, the second outer shell 1082 covers the first outer shell 1072, and the second outer shell 1082 is exposed to the outside of the body coil 10 and is made of a transparent material. Correspondingly, the first outer shell 1072 is made of a light-absorbing material. At the first docking interface 111, the second inner shell 1081 covers the first inner shell 1071, and the second inner shell 1081 is exposed to the side of the patient examination cavity 101 and is made of a transparent material. Correspondingly, the first inner shell 1071 is made of a light-absorbing material. With such a setting, when the first body 107 is butt-joined to the second body 108, at the second docking interface 112, the laser head is located outside the body coil 10, and the second docking interface 112 is welded. The laser passes through the second outer shell 1082 to heat the first outer shell 1072, causing the first outer shell 1072 to melt, and a weld mark is formed between the first outer shell 1072 and the second outer shell 1082 to achieve the welded connection at the second docking interface 112. At the first docking interface 111, the laser head is located inside the patient examination cavity 101, and the first docking interface 111 is welded. The laser passes through the second inner shell 1081 to heat the first inner shell 1071, causing the first inner shell 1071 to melt, and a weld mark is formed between the first inner shell 1071 and the second inner shell 1081 to achieve the welded connection at the first docking interface 111.

[0054] Please refer to Figure 10, in an example of the body coil 10 of the present utility model, the body coil 10 includes a first body 107, a second body 108 and a connecting ring 15. The first body 107 and the second body 108 are arranged along the axial direction of the body coil 10. The connecting ring 15 is clamped between the first body 107 and the second body 108. One end of the connecting ring 15 abuts against the end face of the first body 107 facing the second body 108, and the other end of the connecting ring 15 abuts against the end face of the second body 108 facing the first body 107. The first body 107, the second body 108 and the connecting ring 15 can be coaxially arranged or non - coaxially arranged, as long as at least part of the end face of the connecting ring 15 abuts against the end faces of the first body 107 and the second body 108. Preferably, in this embodiment, the first body 107, the second body 108 and the connecting ring 15 are coaxially arranged, which is convenient for positioning and connection and is beneficial to improving the assembly efficiency of the body coil 10.

[0055] Specifically, in this embodiment, the first outer shell 1072 and the second outer shell 1082 respectively abut against the two end faces of the connecting ring 15, and the first inner shell 1071 and the second inner shell 1081 also respectively abut against the two end faces of the connecting ring 15. In one embodiment, the connecting ring 15 can be an integral solid ring structure. When the first body 107 and the second body 108 are butted and connected, the first cavity 1031 and the second cavity 1032 are divided into independent cavity 103 structures. In another embodiment, the connecting ring 15 can also be a structure with a through - hole in the middle. When meeting the butting and connecting requirements of the first body 107 and the second body 108, the first cavity 1031 and the second cavity 1032 are communicated with each other through the through - hole. The melting point of the connecting ring 15 is greater than the melting points of the first body 107 and the second body 108. The melting points of the first body 107 and the second body 108 can be the same or different, as long as the melting point of the connecting ring 15 is greater than the melting points of the first body 107 and the second body 108.

[0056] Preferably, in this embodiment, the melting point of the first body 107 is the same as the melting point of the second body 108. Such a setting is convenient for controlling the heating temperature. By setting the melting point of the connecting ring 15 to be greater than the melting points of the first body 107 and the second body 108, when the first body 107 and the second body 108 are butted and connected, by heating the docking interface 11 position, the first body 107 and the second body 108 are in a semi - molten state, while the connecting ring 15 can remain in a solid state due to its higher melting point. Then, applying pressure in the axial direction of the first body 107 and the second body 108 makes the semi - molten first body 107 and second body 108 bond to the two end faces of the connecting ring 15. After cooling, the butting and connecting of the first body 107 and the second body 108 are realized. This connection method does not require laser welding, has a lower assembly cost, and a higher assembly efficiency, and is convenient for realizing mass production.

[0057] Please refer to Figure 1, the present utility model also provides a magnetic resonance device 20, comprising: the body coil 10 of any one of the above embodiments. The magnetic resonance device 20 may further include a main magnet 21 and a gradient coil 22 disposed around the inside of the main magnet 21, etc. The specific structures and connection relationships of the main magnet 21 and the gradient coil 22 may refer to the structural descriptions of the main magnet 21 and the gradient coil 22 in the existing magnetic resonance device 20, and will not be elaborated herein. The structure of this body coil 10 is the same as or similar to the body coil 10 described in the above embodiments. To avoid repetition, it will not be described again here.

[0058] The present utility model provides a body coil for being disposed inside the gradient coil of a magnetic resonance device. The body coil includes a patient examination cavity, and a vacuum area is provided in the wall body of the body coil. Since the vacuum area does not have the conditions for heat conduction and convection, it can reduce the transfer of heat generated by the external gradient coil into the patient examination cavity and improve the heat insulation performance of the body coil; at the same time, since sound propagation requires a medium and there is no medium in a vacuum, the setting of the vacuum area can also reduce the transfer of noise generated by the external gradient coil into the patient examination cavity and improve the sound insulation performance of the body coil, thereby improving the comfort and experience of the patient during the scanning process. Therefore, the present utility model effectively overcomes some practical problems in the prior art and thus has high utilization value and practical significance. The above embodiments are only illustrative of the principles and effects of the present utility model and are not used to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A body coil for being disposed inside a gradient coil of a magnetic resonance device, the body coil comprising a patient examination cavity, characterized in that, A vacuum area is provided inside the wall of the body coil, and a sealed cavity is formed inside the wall of the body coil. The cavity is used to form the vacuum area and / or accommodate a filling body having the vacuum area.

2. The body coil according to claim 1, characterized in that, The cavity is provided with an air extraction port for evacuating air.

3. The body coil according to claim 1, wherein The filling body includes a plurality of sound insulation parts and / or a plurality of heat insulation parts, and at least part of the sound insulation parts and / or at least part of the heat insulation parts have the vacuum area.

4. The body coil according to claim 3, characterized in that, The sound insulation part and / or the heat insulation part is a vacuum ball.

5. The body coil according to claim 4, wherein The diameter of the vacuum ball corresponds to the sound wave wavelength corresponding to the noise peak of the gradient coil.

6. The body coil according to any one of claims 1 to 5, characterized in that The body coil includes a first housing and a second housing disposed around the outer periphery of the first housing. The first housing and the second housing are connected to form the cavity.

7. The body coil according to claim 6, characterized in that, The surface of the first housing and / or the second housing facing the cavity side is provided with a convex portion.

8. The body coil according to any one of claims 1 to 5, characterized in that Along the axial direction of the body coil, the body coil includes a first body and a second body. The first body and the second body are arranged axially along the body coil and are butt-jointed to enclose the cavity. The first body and the second body form a docking interface, and the first body and the second body form an overlapping area for laser welding at the docking interface.

9. The body coil according to claim 8, characterized in that The overlapping area is provided with an adhesive layer. Both sides of the adhesive layer are adhered to the first body and the second body respectively. The adhesive layer is configured to be melted during laser welding.

10. The body coil according to claim 8, wherein, The first body and the second body are provided with mutually matching positioning and plugging structures to guide the first body and the second body to be butt-jointed to form the docking interface.

11. The body coil according to claim 10, wherein The positioning and plugging structure includes a boss and a counterbore matching the boss. The boss is disposed on one of the first body and the second body, and the counterbore is disposed on the other of the first body and the second body.

12. The body coil according to claim 8, wherein At the docking interface, one of the first body and the second body exposed to the outside of the body coil is made of a transparent material, and the other is made of an absorbent material; and / or; one of the two exposed to the patient examination cavity side is made of a transparent material, and the other is made of an absorbent material.

13. The body coil according to any one of claims 1 to 5, characterized in that, The body coil includes a first body, a second body and a connecting ring. The first body and the second body are arranged axially along the body coil and are connected by the connecting ring to form the cavity. The melting point of the connecting ring is greater than the melting points of the first body and the second body.

14. A magnetic resonance device, characterized in that, A body coil according to any one of claims 1 to 13.

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