Gradient coil assembly and magnetic resonance system

Abstract

The present invention relates to a gradient coil assembly and a magnetic resonance system. The gradient coil assembly comprises: a main coil; a shielding coil, located outside the main coil, the main coil and the shielding coil are directly connected at the bedside; and a connecting assembly, located at the ends of the main coil and the shielding coil, the connecting assembly connects the main coil and the shielding coil at the service end; wherein the connecting assembly comprises a first connecting component and a second connecting component, the two ends of the first connecting component are connected to the main coil, one end of the second connecting component is used to connect to the outside, and the other end of the second connecting component is connected to the shielding coil. The connection relationship between the main coil and the shielding coil is established by the first connecting component and the second connecting component, without the need to introduce a joint, which can reduce the complexity of the structure, ensure the reliability of the gradient coil assembly, and further ensure the performance of the magnetic resonance system.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic resonance equipment, and in particular to a gradient coil assembly and a magnetic resonance system. Background Art

[0002] In order to achieve a more comfortable patient experience, faster and clearer scanning images, the magnetic resonance system requires the gradient coil to have a larger aperture and higher gradient strength. The increase in the aperture of the gradient coil leads to a decrease in the radial thickness of the gradient coil. At present, in order to improve the performance of the self-shielding coil in the magnetic resonance system, the loop part is removed. Multiple connectors are introduced between the primary and secondary coils, and the connection between the primary and secondary coils is achieved through multiple connectors. However, the introduction of multiple connectors will increase the complexity of the process, and at the same time reduce the reliability of the self-shielding coil, affecting the performance of the magnetic resonance system. Summary of the invention

[0003] Based on this, it is necessary to provide a magnetic resonance system and gradient coil assembly that do not require joints and reduce process complexity in order to address the problem of complex processes caused by the introduction of joints in magnetic resonance systems to improve performance.

[0004] A gradient coil assembly, comprising:

[0005] Main coil;

[0006] a shielding coil, located outside the main coil, the main coil and the shielding coil are directly connected at the bedside; and

[0007] A connecting component is located at the ends of the main coil and the shielding coil, and the connecting component connects the main coil and the shielding coil at the service end; wherein the connecting component includes a first connecting component and a second connecting component, wherein both ends of the first connecting component are connected to the main coil, one end of the second connecting component is used for connecting to the outside, and the other end of the second connecting component is connected to the shielding coil.

[0008] In one embodiment, a cooling channel is provided inside the first connecting component or the second connecting component.

[0009] In one embodiment, the connection assembly includes a conductive water distribution pipe, an inlet joint and an outlet joint, the cooling channel is located in the conductive water distribution pipe, and the inlet joint is connected to the outlet joint through the cooling channel.

[0010] In one embodiment, there are multiple outlet joints, and the multiple outlet joints are arranged at intervals on the conductive water distribution pipe.

[0011] In one embodiment, the first connecting component or the second connecting component is an arc-shaped hollow structure, and both ends of the first connecting component or the second connecting component are closed.

[0012] In one embodiment, the connection assembly further includes a third connection component, one end of the third connection component is used to connect to the outside, the other end of the third connection component is respectively connected to the shielding coil, and the second connection component and the third connection component are located on the same circumference;

[0013] The first connecting component is concentrically arranged with the second connecting component, and the first connecting component is located radially inside or outside the second connecting component; or, the first connecting component and the second connecting component are spaced apart in the axial direction.

[0014] In one embodiment, the gradient coil assembly further includes a water separator, which is connected to an external cooling source and is used to transport cooling liquid to cool the main coil, the shielding coil and the connecting component.

[0015] In one embodiment, the gradient coil assembly further comprises a cooling layer assembly, the cooling layer assembly comprises a plurality of cooling layers, the plurality of cooling layers are respectively arranged close to the shielding coil and the main coil, and the cooling layers are used to cool the shielding coil and the main coil;

[0016] The connecting component connects each of the cooling layer components and is used to transport cooling liquid to each of the cooling layers.

[0017] A magnetic resonance system, comprising:

[0018] A scanner having a bed side and a service side arranged relatively;

[0019] a scanning bed coupled to the scanner at the bed end;

[0020] The scanner includes a gradient coil assembly, the gradient coil assembly including:

[0021] Main coil;

[0022] a shielding coil, located outside the main coil; and

[0023] A connecting component, disposed at the service end and electrically connecting the main coil and the shielding coil;

[0024] The connecting component includes a first connecting component and a second connecting component, wherein both ends of the first connecting component are connected to the main coil, one end of the second connecting component is used for connecting to the outside, and the other end of the second connecting component is connected to the shielding coil.

[0025] In one embodiment, the service end of the magnetic resonance system has a power supply interface and a cooling interface, and the power supply interface and the cooling interface are respectively connected to the gradient coil assembly.

[0026] After adopting the above technical solution, the present invention has at least the following technical effects:

[0027] In the magnetic resonance system and gradient coil assembly of the present invention, the main coil and the shielding coil are directly connected at the bed end and connected through a connecting assembly at the service end, so that the gradient coil assembly forms a conductive loop. The first connecting component directly connects the two main coils, and one end of the second connecting component connects the shielding coil to the outside. The connection relationship between the main coil and the shielding coil is established by the first connecting component and the second connecting component, without the need to introduce a joint, which effectively solves the problem of complex process caused by introducing a joint to connect the main coil and the shielding coil, can reduce the complexity of the structure, ensure the reliability of the gradient coil assembly, and further ensure the performance of the magnetic resonance system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the layout of each coil of the gradient coil in the magnetic resonance system;

[0029] Figure 2 A three-dimensional diagram of an embodiment of an X-axis gradient coil assembly in a gradient coil assembly in a magnetic resonance system;

[0030] Figure 3 for Figure 2 A side view of a gradient coil assembly is shown;

[0031] Figure 4 for Figure 2 An expanded schematic diagram of the main coil in the gradient coil assembly is shown;

[0032] Figure 5 for Figure 2 An expanded schematic diagram of a shielding coil in a gradient coil assembly is shown;

[0033] Figure 6 for Figure 2 A perspective view of a connection assembly in a gradient coil assembly is shown;

[0034] Figure 7 for Figure 6 A perspective view of the connection assembly portion shown;

[0035] Figure 8 for Figure 7 A front view of the connecting part shown;

[0036] Fig. 9 for Figure 1 A schematic diagram of a gradient coil assembly shown is applied to a magnetic resonance system;

[0037] Fig.10 for Figure 2 Schematic diagram of the gradient coil assembly connected to the water divider is shown.

[0038] Wherein: 100, gradient coil assembly; 110, main coil; 111, first main coil; 112, second main coil; 120, shielding coil; 121, first shielding coil; 122, second shielding coil; 130, connecting assembly; 1311, conductive water distribution pipe; 1312, inlet connector; 1313, outlet connector; 132, first connecting component; 133, second connecting component; 134, third connecting component; 135, electrode; 140, water distributor; 10, scanner; 11, scanning cavity; 20, scanning bed; 30, scanning object. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0045] See also Figures 1 to 8 The present invention provides a gradient coil assembly 100. The gradient coil assembly 100 is used to generate a gradient magnetic field. Moreover, the gradient coil assembly 100 also includes a cooling structure capable of cooling the gradient coil that generates the gradient magnetic field, thereby reducing the operating temperature while ensuring the normal operation of the magnetic resonance system, thereby ensuring the reliability of the operation of the magnetic resonance system. It is worth noting that the gradient coil assembly 100 of the present invention is mainly used in a magnetic resonance system (Magnetic Resonance, MR); of course, in other embodiments of the present invention, the gradient coil assembly 100 can also be applied to a multimodal system formed by a positron emission tomography (PET) device and an MR device, and a magnetic resonance radiotherapy positioning system (MR Radiation Therapy, MR-RT).

[0046] It is understandable that the main coil and the shielding coil in the gradient coil of the current magnetic resonance system are connected by a joint, which makes the process of the gradient coil complicated, reduces the reliability of the gradient coil, and further affects the performance of the magnetic resonance system. To this end, the present invention provides a new type of gradient coil assembly 100, which can ensure the performance without adding joints, reduce the complexity of the structure, and ensure accurate imaging results. The specific structure of the gradient coil assembly 100 is described in detail below.

[0047] See also Figures 1 to 8 In one embodiment, the gradient coil assembly 100 includes a main coil 110, a shielding coil 120, and a connecting assembly 130. The main coil 110 can be arranged to form a cylindrical shape, and the shielding coil 120 is located outside the main coil 110 and is arranged concentrically with the main coil 110. The main coil 110 and the shielding coil 120 are directly connected at the bed end, and the main coil 110 and the shielding coil 120 are connected at the service end through the connecting assembly 130. The main coil 110 and the shielding coil 120 are directly connected and indirectly connected through the connecting assembly 130, so that the gradient coil assembly 100 can form a conductive loop, ensure the performance of the gradient coil assembly 100, and enable the gradient coil assembly 100 to achieve corresponding functions.

[0048] The extension direction of the connection component 130 is the same as the winding direction of the main coil 110, such as being concentric with the main coil 110 and located at the ends of the main coil 110 and the shielding coil 120. The connection component 130 electrically connects the main coil 110 and the shielding coil 120, and the connection component 130 is also used to transport cooling liquid. It is worth noting that in the magnetic resonance system, the scanner has a bed end and a service end that are relatively arranged, the bed end refers to the side of the scanner close to the scanning bed, and the service end refers to the side of the scanner away from the scanning bed.

[0049] The main coil 110 is arranged in a hollow cylindrical shape, and the shielding coil 120 is also arranged in a hollow cylindrical shape. The shielding coil 120 is sleeved on the outside of the main coil 110. In other words, the main coil 110 and the shielding coil 120 are arranged layer by layer. Moreover, the main coil 110 and the shielding coil 120 are arranged concentrically, and the cylindrical axis of the main coil 110 and the cylindrical axis of the shielding coil 120 basically coincide with each other to ensure the uniformity of the magnetic field and the imaging effect. The main coil 110 generates a main gradient magnetic field, and the shielding coil 120 is used to generate a gradient shielding magnetic field to prevent the magnetic field generated by the main coil 110 from interfering with the superconducting coil of the magnetic resonance system, thereby ensuring the reliability of the operation of the magnetic resonance system.

[0050] The connecting component 130 is located at the ends of the main coil 110 and the shielding coil 120. The connecting component 130 electrically connects the main coil 110 and the shielding coil 120, so that the main coil 110 and the shielding coil 120 are electrically connected to form a conductive link, thereby ensuring that the main coil 110 and the shielding coil 120 can work normally. The connecting component 130 can also realize the flow of the coolant while conducting electricity. When the coolant flows in the connecting component 130, the connecting component 130 can be cooled and the temperature of the connecting component 130 can be reduced.

[0051] The main coil 110 and the shielding coil 120 are directly connected at the bedside, and the main coil 110 and the shielding coil 120 are electrically connected at the service side through a connecting assembly 130. The axis of the cylindrical main coil 110 and the cylindrical shielding coil 120 coincide with the axis of the scanning cavity 11. The main coil 110 and the shielding coil 120 are directly electrically connected at one side of the bedside, and the main coil 110 and the shielding coil 120 are electrically connected at one side of the service side through a connecting assembly 130 to reduce the introduction of joints and reduce the complexity of the structure. It is worth noting that the connecting assembly 130 connecting the main coil 110 and the shielding coil 120 in the present invention is equivalent to the annular connecting wire of the current gradient coil structure.

[0052] The gradient coil assembly 100 of the above embodiment connects the main coil 110 and the shielding coil 120 at the service end through the connecting assembly 130, so that the gradient coil assembly 100 forms a conductive loop, which effectively solves the problem of complex process caused by introducing a joint to connect the main coil and the shielding coil, reduces the complexity of the structure, ensures the reliability of the gradient coil assembly 100, and further ensures the performance of the magnetic resonance system.

[0053] In one embodiment, the connection component can also deliver cooling liquid. That is, while the connection component 130 electrically connects the main coil 110 and the shielding coil 120 at the service end, it can also deliver cooling liquid therein to reduce the working temperature of the connection component 130 and prevent the end temperature from being too high to affect the imaging effect.

[0054] In one embodiment, the connection component 130 includes a first connection component 132 and a second connection component 133. Both ends of the first connection component 132 are connected to the main coil 110, one end of the second connection component 133 is used to connect to the outside, and the other end of the second connection component 133 is connected to the shielding coil 120. The main coil 110 and the shielding coil 120 are directly electrically connected at the bedside, and both ends of the first connection component 132 are connected to the main coil 110 at the bedside, and the second connection component 133 connects the shielding coil 120 and the electrode 135, and the electrode 135 is electrically connected to the power supply interface of the magnetic resonance system to realize the power supply of the main coil 110 and the shielding coil 120.

[0055] See also Figure 3 , Figures 6 to 8 In one embodiment, at least one of the first connecting component 132 and the second connecting component 133 in the connecting assembly has an internal cooling channel, and the cooling channel is used to allow the coolant to flow. The first connecting component 132 and the second connecting component 133 realize the connection between the main coil 110 and the shielding coil 120, so that an electrically connected loop is formed between the main coil 110 and the shielding coil 120, ensuring that the main coil 110 and the shielding coil 120 are powered on and work. At the same time, at least one of the first connecting component 132 and the second connecting component 133 has a cooling channel inside, which can realize the cooling of the connecting assembly 130, reduce the working temperature of the connecting assembly 130, and improve the reliability of the connection assembly 130.

[0056] Optionally, one of the first connecting component 132 and the second connecting component 133 may have a cooling channel, or both of the first connecting component 132 and the second connecting component 133 may have a cooling channel. The source and flow direction of the coolant will be described in detail later.

[0057] Specifically, the main coil 110 and the shielding coil 120 are directly electrically connected at the bedside, the two ends of the first connecting component 132 are connected to the main coil 110 at the service end, one end of the second connecting component 133 is connected to a shielding coil 120, and the other end is connected to the power supply interface of the magnetic resonance system. The other shielding coil 120 can be directly connected to the power supply interface of the magnetic resonance system, or it can be indirectly connected, which will be described in detail later. The electrical connection relationship between the main coil 110 and the shielding coil 120 is established by the above-mentioned first connecting component 132 and the second connecting component 133, so that an electrical connection loop is formed between the main coil 110 and the shielding coil 120.

[0058] See also Figures 1 to 5 In one embodiment, the main coil 110 includes a first main coil 111 and a second main coil 112 which are arranged opposite to each other, and the first main coil 111 and the second main coil 112 are both wound by an electric conductor according to a set shape, and the projection of the first main coil 111 in the axial direction is semicircular, and the projection of the second main coil 112 in the axial direction is semicircular. The shielding coil 120 includes a first shielding coil 121 and a second shielding coil 122 which are arranged opposite to each other, and the projection of the first shielding coil 121 in the axial direction is semicircular, and the projection of the second shielding coil 122 in the axial direction is semicircular. In addition, the first shielding coil 121 is located outside the first main coil 111, and the second main coil 112 is located outside the second shielding coil 122. The ends of the first main coil 111 and the second main coil 112 at the bedside are directly electrically connected to the ends of the first shielding coil 121 and the second shielding coil 122 at the bedside.

[0059] The first main coil 111 and the second main coil 112 are connected at the end of the service end through a connecting component 130. The first shielding coil 121 and the second shielding coil 122 are electrically connected at the end of the service end through the connecting component 130, and the ends of the first shielding coil 121 and the second shielding coil 122 at the service end are also connected to the power supply interface of the magnetic resonance system through the connecting component 130. Specifically, the first main coil 111 and the second main coil 112 are connected at the end of the service end through a first connecting component 132. The end of the first shielding coil 121 at the service end is connected to the power supply interface through a second connecting component 133, and the end of the second shielding coil 122 at the service end can be directly or indirectly connected to the power supply interface.

[0060] Optionally, the gradient coil assembly 100 further includes a mounting cylinder, which is in a hollow cylindrical shape. The mounting cylinder plays a bearing role and is used to carry each coil of the gradient coil assembly 100. Specifically, there are two mounting cylinders, which are arranged in layers, one of which is used to mount the main coil 110, and the other is used to mount the shielding coil 120. Moreover, there is a preset distance between the two mounting cylinders, such as Figure 2 shown.

[0061] The first main coil 111 is installed at the 0° position, and the second main coil 112 is installed at the 180° position. Figure 1 As shown, Figure 4 This is a schematic diagram of the main coil 110 being deployed on the mounting cylinder. Figure 5 In a side view of the main coil 110 , the first main coil 111 and the second main coil 112 are semicircular in shape on the side.

[0062] See also Figures 6 to 8 In one embodiment, when at least one of the first connecting component 132 and the second connecting component 133 in the connecting component 130 has a cooling channel, the first connecting component 132 or the second connecting component 133 includes a conductive water distribution pipe 1311, an inlet joint 1312 and an outlet joint 1313. The cooling channel is located in the conductive water distribution pipe 1311. The inlet joint 1312 is connected to the outlet joint 1313 through the cooling channel. The outlet joint 1313 is connected to the cooling layer assembly. The conductive water distribution pipe 1311 is the main structure of the connecting component 130. The conductive water distribution pipe 1311 plays the role of electrical connection and cooling water distribution. The conductive water distribution pipe 1311 realizes the electrical connection between the main coil 110 and the shielding coil 120. In addition, a cooling layer assembly is arranged on the inner side or the outer side of the main coil 110. The conductive water distribution pipe 1311 is also connected to the external cold source and the cooling layer assembly inside the gradient coil assembly 100 to realize the transmission of the cooling liquid. The cooling layer assembly inside the gradient coil assembly 100 will be described in detail later.

[0063] The conductive water distribution pipe 1311 is provided with an outlet joint 1313 and an inlet joint 1312. The conductive water distribution pipe 1311 is provided with a cooling channel. The outlet joint 1313 and the inlet joint 1312 are respectively connected to the cooling channel, and the outlet joint 1313 is connected to the cooling layer assembly. The inlet joint 1312 is used to transport the coolant to the cooling channel of the conductive water distribution pipe 1311. The cooling channel transports the coolant to the outlet joint 1313, and the coolant is transported into the cooling layer assembly through the outlet joint 1313. Optionally, the outlet joint 1313 and the inlet joint 1312 are arranged on the outer wall of the conductive water distribution pipe 1311, and are protruded along the outer wall of the conductive water distribution pipe 1311. Optionally, the inlet joint 1312 and the outlet joint 1313 are arranged on the same side; of course, in other embodiments of the present invention, the inlet joint 1312 and the outlet joint 1313 can also be arranged on different sides. Optionally, the inlet connector 1312 extends along a first direction (a direction away from the main coil 110 in the figure), and the outlet connector 1313 extends along a second direction (a direction toward the main coil 110 in the figure).

[0064] Optionally, the conductive water distribution pipe 1311 is made of non-magnetic metal with good conductivity. Further, the conductive water distribution pipe 1311 is made of copper, aluminum and other materials.

[0065] In one embodiment, there are multiple outlet joints 1313, and the multiple outlet joints 1313 are arranged at intervals on the conductive water distribution pipe 1311. The outlet joint 1313 is used to send out the coolant in the conductive water distribution pipe 1311. The coolant in the conductive water distribution pipe 1311 can be output respectively through the multiple outlet joints 1313. Optionally, the multiple outlet joints 1313 are arranged along the same direction; of course, in other embodiments of the present invention, the multiple outlet joints 1313 can also be staggered.

[0066] In one embodiment, the cooling channel includes a plurality of cooling cavities, which are arranged layer by layer along the radial direction, and two adjacent cooling cavities are independently arranged and connected through through holes. The first cooling cavity is connected to the inlet joint 1312, and the last cooling cavity is connected to the outlet joint 1313. The inlet joint 1312 delivers the coolant to the first cooling cavity, and transmits it step by step through the through holes of the cooling cavity, delivers it to the last cooling cavity, and finally delivers it through the outlet joint 1313. In this way, the flow rate of the coolant output by each outlet joint 1313 can be guaranteed to be consistent, the cooling temperature can be guaranteed to be balanced, and the cooling effect can be guaranteed.

[0067] In one embodiment, the first connecting component 132 or the second connecting component 133 is an arc-shaped hollow structure, and the two ends of the first connecting component 132 or the second connecting component 133 are closed. The first connecting component 132 or the second connecting component 133 is arranged in an arc shape, so that the center of the connecting component 130 coincides with the center of the main coil 110 and the shielding coil 120. In this way, the first connecting component 132 and the second connecting component 133 can be installed at the ends of the main coil 110 and the shielding coil 120, without occupying the internal space, which is convenient for the arrangement of other components of the magnetic resonance system. The closing of the two ends of the first connecting component 132 and the second connecting component 133 can prevent the leakage of the coolant in the corresponding channel and ensure the performance.

[0068] In one embodiment, the inlet connector 1312 extends out of the end of the gradient coil assembly 100, such as the inlet connector 1312 is exposed to the outside of the cylinder formed by the gradient coil assembly 100 or extends to the end of the cylinder, for connecting to an external cold source. In other words, the inlet connector 1312 has a certain length. In this way, the inlet connector 1312 is arranged behind the conductive water distribution pipe 1311, and the inlet connector 1312 will be exposed to the outside of the gradient coil assembly 100, and the inlet connector 1312 can be connected to an external cold source. It can be understood that the external cold source is used to realize the circulating cooling of the coolant, and the output end of the external cold source is connected to the inlet connector 1312, which is used to transport the coolant to the conductive water distribution pipe 1311, and the external cold source also recovers the coolant through the output end to realize the recycling of the coolant. Optionally, the coolant is deionized cooling water.

[0069] In one embodiment, the gradient coil assembly 100 further includes a cooling layer assembly, which includes a plurality of cooling layers, which are respectively arranged near the shielding coil 120 and the main coil 110, such as being arranged on the inner side or the outer side of the main coil 110 and the shielding coil 120, and the cooling layers are used to cool the shielding coil 120 and the main coil 110. The connecting assembly 130 connects the cooling layer assemblies and is used to transport cooling liquid to the cooling layers.

[0070] In one embodiment, the gradient coil assembly 100 further includes an insulating layer, which is coated on the outside of the shielding coil 120 and the cooling layer assembly to form a cylinder, or the insulating layer is coated on the outside of the main coil 110 and the cooling layer assembly to form a cylinder, or the insulating layer is coated on the outside of the inner main coil 110, the middle cooling layer assembly and the outer shielding coil 120 to form a cylinder. The insulating layer is usually made of a material with high dielectric strength, such as epoxy resin, glass cloth and other insulating materials.

[0071] The cooling layer assembly is used to cool the coil conductors at the non-end positions of the main coil 110 and the shielding coil 120, so as to reduce the working temperature of the main coil 110 and the shielding coil 120 and ensure the working reliability of the main coil 110 and the shielding coil 120. The cooling layer assembly is arranged close to the main coil 110 and the shielding coil 120, and the cooling layer assembly is connected to the outlet joint 1313 of the conductive water distribution pipe 1311. The coolant in the conductive water distribution pipe 1311 is transported to the cooling layer assembly through the water outlet joint. The cooling layer assembly exchanges heat with the main coil 110 and the shielding coil 120 through the coolant, so as to reduce the temperature of the main coil 110 and the shielding coil 120.

[0072] Specifically, the cooling layer assembly includes a plurality of cooling layers, and the main coil 110 and the shielding coil 120 are cooled by the plurality of cooling layers. It can be understood that the cooling layer here is actually a layered structure surrounded by cooling pipes, and the cooling pipes are arranged close to the main coil 110 and the shielding coil 120 to cool the main coil 110 and the shielding coil 120. Moreover, the number of cooling layers is set according to the heat dissipation of the main coil 110 and the shielding coil 120. When the heat dissipation of the main coil 110 and the shielding coil 120 is small, one or two layers of cooling layers can be set. When the heat dissipation of the main coil 110 and the shielding coil 120 is large, more layers of cooling layers can be set.

[0073] Each cooling layer extends a connecting pipe at the service end and is connected to the outlet joint 1313 of the conductive water distribution pipe 1311, so that the coolant in the conductive water distribution pipe 1311 is sent to each cooling layer through the outlet joint 1313, and the main coil 110 and the shielding coil 120 are cooled by the cooling layer. It can be understood that each cooling layer may have multiple connecting pipes, and multiple connecting pipes are connected to the outlet joint 1313.

[0074] See also Figures 2 to 5 In one embodiment, the connection assembly 130 further includes a third connection component 134, one end of the third connection component 134 is connected to the shielding coil 120, and the other end of the third connection component 134 is connected to the power supply interface of the magnetic resonance system through the electrode 135. In other words, the two ends of the shielding coil 120 are respectively connected to the outside through a connection component.

[0075] The connection relationship between the connection component 130 and the main coil 110 and the shielding coil 120 is described in detail below. The connection component 130 includes a first connection component 132, a second connection component 133, and a third connection component 134. The main coil 110 and the shielding coil 120 are directly electrically connected at the bedside. The two ends of the first connection component 132 are connected to the main coil 110 at the bedside. The second connection component 133 and the third connection component 134 connect the shielding coil 120 and the electrode 135. The electrode 135 is electrically connected to the power supply interface of the magnetic resonance system to realize the power supply of the main coil 110 and the shielding coil 120.

[0076] The first main coil 111 and the second main coil 112 are connected at the end of the service end through the first connecting component 132. The first shielding coil 121 is connected to the second connecting component 133 at the end of the service end, and the second shielding coil 122 is connected to the third connecting component 134 at the end of the service end, and the second connecting component 133 and the third connecting component 134 are also connected to the power supply interface of the magnetic resonance system through the electrode 135.

[0077] Optionally, at least one of the first connecting part 132, the second connecting part 133 and the third connecting part 134 has a cooling channel. Optionally, one of the first connecting part 132, the second connecting part 133 and the third connecting part 134 can be used as a liquid inlet pipeline. In this case, a water distributor can be added to the connecting pipeline at the outlet of each cooling layer, and the cooling liquid after absorbing heat is introduced into the external cold source through the water distributor. Of course, two of the first connecting part 132, the second connecting part 133 and the third connecting part 134 can also have cooling channels, one of which is used as a liquid inlet pipeline and the other as a liquid outlet pipeline, respectively connecting the inlet and outlet of each cooling layer. It is also possible that three of the first connecting part 132, the second connecting part 133 and the third connecting part 134 all have cooling channels.

[0078] The present invention only takes the first connecting component 132 and the second connecting component 133 having cooling channels as an example for explanation. The principles and layouts of other configurations are substantially the same as those of the first connecting component 132 and the second connecting component 133 having cooling channels, and are not described in detail herein.

[0079] Specifically, the second connecting component 133 and the third connecting component 134 have a cooling flow channel, and the second connecting component 133 is a liquid inlet pipeline, and the third connecting component 134 is a liquid outlet pipeline; the inlet connector 1312 of the second connecting component 133 is connected to the liquid outlet end of the external cold source, and the multiple outlet connectors 1313 of the second connecting component 133 are respectively connected to the connecting pipelines of the inlets of each cooling layer; the outlet connector 1313 of the third connecting component 134 is connected to the connecting pipelines of the outlets of each cooling layer, and the inlet connector 1312 of the third connecting component 134 is connected to the liquid inlet end of the external cold source.

[0080] The cooling liquid in the external cold source enters the conductive water distribution pipe 1311 of the second connecting component 133 through the inlet joint 1312, and is transported to each cooling layer through the outlet joint 1313 of the second connecting component 133. Each cooling layer cools and exchanges heat with the corresponding main coil 110 and shielding coil 120 respectively. The cooling liquid after absorbing heat flows out from the cooling layer, and is transported to the conductive water distribution pipe 1311 of the third connecting component 134 through the outlet joint 1313 of the third connecting component 134, and the cooling liquid after absorbing heat is transported to the external cold source through the inlet joint 1312 of the third connecting component 134.

[0081] In one embodiment, the second connecting member 133 and the third connecting member 134 are located on the same circumference. In this way, the Lorentz force can be offset and a better force balance effect can be achieved. The first connecting member 132 is concentrically arranged with the second connecting member 133, and the first connecting member 132 is located radially inside or radially outside the second connecting member 133; or, the first connecting member 132 and the second connecting member 133 are spaced apart in the axial direction. In this embodiment, the first connecting member 132 is located radially inside the second connecting member 133.

[0082] The gradient coil assembly 100 of the present invention uses a connecting assembly 130 capable of conveying cooling liquid as an end connecting line of the main coil 110 and the shielding coil 120 to realize the electrical connection between the main coil 110 and the shielding coil 120. The gradient coil assembly 100 is provided with a first connecting component 132, a second connecting component 133 and a third connecting component 134 at the service end, and at least one of the first connecting component 132, the second connecting component 133 and the third connecting component 134 has a cooling flow channel inside. Specifically, the conductive water distribution pipe 1311 of the first connecting component 132, the second connecting component 133 and the third connecting component 134 can be both electrically connected and convey cooling liquid, and the heat generated by the first connecting component 132, the second connecting component 133 and the third connecting component 134 during operation is directly taken away by the cooling liquid, thereby avoiding temperature rise.

[0083] The first connecting component 132, the second connecting component 133 and the third connecting component 134 used in the gradient coil assembly 100 of the present invention integrate the annular connecting wire inside the coil with the water divider, and reduce the temperature of the connecting assembly 130 while realizing the conductive function. After the first connecting component 132, the second connecting component 133 and the third connecting component 134 are used as the annular connecting wire of the coil, a conductive link is formed with the main coil 110 and the shielding coil 120. The heat generated by the first connecting component 132, the second connecting component 133 and the third connecting component 134 can be taken away by the cooling liquid flowing inside, solving the problem of heating of the annular connecting wire. Moreover, space is saved, and interference caused by the water divider introduced into the space is avoided.

[0084] See also Fig.10 In another embodiment of the present invention, the gradient coil assembly 100 further includes a water separator 140, one end of which is connected to an external cold source, and the other end of which is connected to a cooling layer assembly inside the gradient coil assembly 100. The cooling liquid in the external cooling is respectively transported to each cooling layer of the cooling layer assembly through the water separator 140. The water separator 140 can divert the cooling liquid to the cooling layer of the cooling layer assembly, and while reducing the temperature of the main coil 110 and the shielding coil 120, it can also reduce the temperature of the connecting assembly 130, thereby ensuring the reliability of the connection assembly 130.

[0085] In this case, the connection component 130 can only connect the main coil 110 and the shielding coil 120, and no cooling channel is provided inside the connection component 130. That is, the first connection component 132, the second connection component 133 and the third connection component 134 are simple conductive connection components, and no cooling channel is provided inside. The coolant delivered by the water distributor 140 cools the connection component 131 to ensure the reliability of the connection component 131.

[0086] It is worth noting that, except for using the water separator 140 to replace the cooling channel of the connecting assembly 130, the rest of the structure of the gradient coil assembly 100 in this embodiment is the same as that of the gradient coil assembly 100 in the above embodiment, which will not be described in detail here.

[0087] Optionally, the water distributor 140 includes a water inlet pipeline, a water distributor body, and a plurality of water outlet pipelines, wherein the water inlet pipeline is connected to the water distributor body, the water distributor body is hollow, and the plurality of water outlet pipelines are also connected to the water distributor body. The water inlet pipeline is also connected to an external cold source, and the plurality of water outlet pipelines are respectively connected to each connecting pipeline in the cooling layer. The water inlet pipeline transports the coolant in the external cold source to the water distributor body, distributes the coolant through the water distributor body, and transports the coolant to each water outlet pipeline respectively, and then transports it to the corresponding cooling layer to achieve cooling of the components at the corresponding positions.

[0088] Optionally, each cooling layer corresponds to at least one water distributor, so that enough coolant can be delivered to the cooling layer to ensure the cooling effect of the cooling layer.

[0089] See also Figure 1 , Figure 2 and Fig. 9 The present invention also provides a magnetic resonance system. The magnetic resonance system includes a scanner 10 and a scanning bed 20. The scanner 10 includes a superconducting magnet, a gradient coil assembly 100, and a radio frequency transmitting coil, which are arranged from the outside to the inside in sequence, and the superconducting magnet, the gradient coil assembly 100, and the radio frequency transmitting coil are surrounded together to form an axial ( Fig. 9 The scanning cavity 11 extends in a longitudinal direction (in a longitudinal direction). The scanning object 30 is carried on the scanning bed 20 and enters or moves out of the scanning cavity 11 to perform medical imaging (perform scanning imaging operations). In this embodiment, the length direction of the scanning bed 20 is the X direction, the width direction of the scanning bed 20 is the Y direction, and the vertical direction is the Z direction. The scanner 10 has a front and rear end opposite to each other, and the rear end of the scanner 10 is coupled to the scanning bed 20. In this embodiment, the rear end of the scanner 10 is the patient end / bed end, and the front end of the scanner 10 is the service end.

[0090] The gradient coil assembly 100 includes a main coil 110, a shielding coil 120, and a connecting assembly 130. The shielding coil 120 is located outside the main coil 110 and is arranged concentrically with the main coil 110. The connecting assembly 130 is arranged concentrically with the main coil 110, and the connecting assembly 130 electrically connects the main coil 110 and the shielding coil 120. The connecting assembly 130 includes a first connecting component 132 and a second connecting component 133. The structure of the gradient coil assembly 100 used in the magnetic resonance system of this embodiment is substantially the same as that of the gradient coil assembly 100 in the above-mentioned embodiment, and will not be repeated here.

[0091] When the gradient coil of the magnetic resonance system of the present invention is configured as the gradient coil assembly 100 of the above embodiment, the electrical connection effect can be ensured while cooling the end of the gradient coil, thereby ensuring that the gradient coil can work normally and further ensuring the accuracy of the imaging result.

[0092] In one embodiment, the gradient coil includes an X-axis coil assembly, a Y-axis coil assembly, and a Z-axis coil assembly. The X-axis coil assembly, the Y-axis coil assembly, and the Z-axis coil assembly all include a main coil 110 and a shielding coil 120. These six groups of coils are assembled together with the same axis to form a roughly cylindrical structure, and the scanning bed 20 can be controlled and enter and exit the interior of the gradient coil (in the cylindrical structure formed by the gradient coil). The main coil 110GX of the X-axis coil assembly includes two semicircular coils GX1 and GX2, GX1 is located at the 0° position, and GX2 is located at the 180° position. The main coil 110GY of the Y-axis coil assembly includes two semicircular coils GY1 and GY2. GY1 is located at the 90° position, and GY2 is located at the 270° position. The shielding coil SX of the X-axis coil assembly has the same structure as the shielding coil SY of the Y-axis coil assembly, which will not be repeated here. The main coil 110GZ and the shielding coil 120SZ coils of the Z-axis coil assembly are spiral tube structures.

[0093] After GX is expanded horizontally, Figure 4 The GX1 and GX2 coils are connected by a first connecting member 132. Figure 5 As shown. SX1 is connected to the electrode 135 through the second connecting component 133, and SX2 is connected to the electrode 135 through the third connecting component 134 at the service end. The output cables of the two electrodes 135 and the gradient coil are connected to the power supply interface of the magnetic resonance system. The structure of the first connecting component 132 and the second connecting component 133 having cooling channels has been mentioned above and will not be repeated here.

[0094] It is worth noting that the specific structure and working principle of the connection mode of the main coil and the shielding coil included in the Y-axis coil assembly are substantially the same as the connection mode of the main coil and the shielding coil included in the X-coil assembly, which will not be described in detail here. After the magnetic resonance system of the present invention adopts the gradient coil assembly 100, the temperature of the gradient coil can be reduced while ensuring the performance of the gradient coil, thereby ensuring the reliability of the gradient coil.

[0095] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0096] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A gradient coil assembly, characterized in that: include: Main coil; A shielding coil is located outside the main coil, and the main coil and the shielding coil are directly connected at the bedside; as well as A connecting component is located at the ends of the main coil and the shielding coil, and the connecting component connects the main coil and the shielding coil at the service end; wherein the connecting component includes a first connecting component and a second connecting component, wherein both ends of the first connecting component are connected to the main coil, one end of the second connecting component is used for connecting to the outside, and the other end of the second connecting component is connected to the shielding coil.

2. The gradient coil assembly according to claim 1, characterized in that: The first connecting component or the second connecting component has a cooling channel inside.

3. The gradient coil assembly according to claim 2, characterized in that: The connection assembly includes a conductive water distribution pipe, an inlet joint and an outlet joint. The cooling flow channel is located in the conductive water distribution pipe, and the inlet joint is communicated with the outlet joint through the cooling flow channel.

4. The gradient coil assembly according to claim 3, characterized in that: There are multiple outlet joints, and the multiple outlet joints are arranged at intervals on the conductive water distribution pipe.

5. The gradient coil assembly according to claim 2, characterized in that: The first connecting component or the second connecting component is an arc-shaped hollow structure, and both ends of the first connecting component or the second connecting component are closed.

6. The gradient coil assembly according to claim 1, characterized in that: The connection assembly further includes a third connection component, one end of the third connection component is used to connect to the outside, the other end of the third connection component is respectively connected to the shielding coil, and the second connection component and the third connection component are located on the same circumference; The first connecting component is concentrically arranged with the second connecting component, and the first connecting component is located radially inside or outside the second connecting component; or, the first connecting component and the second connecting component are spaced apart in the axial direction.

7. The gradient coil assembly according to claim 1, characterized in that: The gradient coil assembly further comprises a water separator, which is connected to an external cold source and is used for conveying cooling liquid to cool the main coil, the shielding coil and the connecting component.

8. The gradient coil assembly according to any one of claims 3 to 7, characterized in that: The gradient coil assembly further comprises a cooling layer assembly, wherein the cooling layer assembly comprises a plurality of cooling layers, wherein the plurality of cooling layers are respectively arranged close to the shielding coil and the main coil, and the cooling layers are used to cool the shielding coil and the main coil; The connecting component connects each of the cooling layer components and is used to transport cooling liquid to each of the cooling layers.

9. A magnetic resonance system, characterized in that: include: A scanner having a bed side and a service side arranged relatively; a scanning bed coupled to the scanner at the bed end; The scanner includes a gradient coil assembly, the gradient coil assembly including: Main coil; a shielding coil, located outside the main coil; and A connecting component, disposed at the service end and electrically connecting the main coil and the shielding coil; The connecting component includes a first connecting component and a second connecting component, wherein both ends of the first connecting component are connected to the main coil, one end of the second connecting component is used for connecting to the outside, and the other end of the second connecting component is connected to the shielding coil.

10. The magnetic resonance system according to claim 9, characterized in that The service end of the magnetic resonance system has a power supply interface and a cooling interface, and the power supply interface and the cooling interface are respectively connected to the gradient coil assembly.

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