CN115128527A - Gradient coil assembly and magnetic resonance system - Google Patents

Abstract

The invention relates to a gradient coil assembly and a magnetic resonance system. The gradient coil assembly includes: a main coil; the shielding coil is positioned on the outer side of the main coil, and the main coil is directly connected with the shielding coil at the sickbed end; the connecting assembly is positioned at the end parts of the main coil and the shielding coil and is used for connecting the main coil and the shielding coil at a service end; the connecting assembly comprises a first connecting part and a second connecting part, two ends of the first connecting part are connected with the main coil, one end of the second connecting part is used for being connected with the outside, and the other end of the second connecting part is connected with the shielding coil. The connection relation between the main coil and the shielding coil is established through the first connecting part and the second connecting part, a connector is not required to be introduced, the complexity of the structure can be reduced, the working reliability of the gradient coil assembly is ensured, and the use performance of the magnetic resonance system is further ensured.

Description

Gradient coil assembly and magnetic resonance system

technical field

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

Background technique

In order to achieve a more comfortable patient experience and a faster and clearer scanning image, the MRI system requires the gradient coil to have a larger aperture and higher gradient intensity. An increase in the gradient coil aperture results in a decrease in the radial thickness of the gradient coil. At present, in order to improve the performance of the self-shielded coil in the magnetic resonance system, the loop part is removed. A plurality of joints are introduced between the primary and secondary coils, and the connection between the primary and secondary coils is realized through the plurality of joints. However, after the introduction of multiple joints, the complexity of the process will be increased, and the reliability of the self-shielded coil will be reduced, and the performance of the magnetic resonance system will be affected.

SUMMARY OF THE INVENTION

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

A gradient coil assembly, comprising:

main coil;

a shield coil, located outside the main coil, the main coil and the shield coil are directly connected at the bed end; and

a connection component, located at the end of the main coil and the shield coil, the connection component connects the main coil and the shield coil at the service end; wherein the connection component includes a first connection part and a second connection The two ends of the first connecting member are connected to the main coil, one end of the second connecting member is used for external connection, and the other end of the second connecting member is connected to the shield coil.

In one of the embodiments, the inside of the first connecting part or the second connecting part has a cooling channel.

In one embodiment, 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 and the outlet joint communicate with each other through the cooling flow channel .

In one embodiment, the number of the outlet joints is plural, and the plurality of the outlet joints are arranged in the conductive water distribution pipe at intervals.

In one embodiment, the first connecting member or the second connecting member has an arc-shaped hollow structure, and both ends of the first connecting member or the second connecting member are closed.

In one of the embodiments, the connection assembly further includes a third connection part, one end of the third connection part is used for connecting with the outside, the other end of the third connection part is connected to the shielding coil respectively, the The second connecting part is located on the same circumference as the third connecting part;

The first connecting member and the second connecting member are arranged concentrically, and the first connecting member is located on the radially inner side or the radially outer side of the second connecting member; The two connecting parts are spaced apart along the axial direction.

In one of the embodiments, the gradient coil assembly further includes a water divider, the water divider is connected to an external cooling source, and is used for delivering cooling liquid to cool the main coil, the shielding coil and the connection part.

In one of the embodiments, the gradient coil assembly further includes a cooling layer assembly, the cooling layer assembly includes a plurality of cooling layers, the plurality of cooling layers are respectively disposed close to the shield coil and the main coil, the a cooling layer for cooling the shielding coil and the main coil;

The connecting assembly connects each of the cooling layer assemblies, and is used for cooling liquid delivered to each of the cooling layers.

A magnetic resonance system comprising:

Scanner with oppositely arranged bedside and server side;

a scanning bed, coupled with the scanner at the end of the bed;

The scanner includes a gradient coil assembly including:

main coil;

a shield coil, located outside the main coil; and

a connection component, disposed at the service end and electrically connecting the main coil and the shielding coil;

The connection assembly includes a first connection part and a second connection part, two ends of the first connection part are connected to the main coil, one end of the second connection part is used for connecting with the outside, and the second connection part The other end of the shielding coil is connected.

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.

After adopting the above-mentioned technical scheme, the present invention at least has the following technical effects:

In the magnetic resonance system and the gradient coil assembly of the present invention, the main coil and the shielding coil are directly connected at the bed end, and are connected at the service end through the connecting assembly, so that the gradient coil assembly forms a conductive loop. The first connection part directly connects the two main coils, and one end of the second connection part connects the shield coil and the outside. The connection relationship between the main coil and the shield coil is established by the first connection part and the second connection part, without introducing a joint, effectively solving the problem of complicated process caused by the introduction of joints to connect the main coil and the shield coil at present, and can reduce the complexity of the structure degree, to ensure the reliability of the gradient coil assembly, and then to ensure the performance of the magnetic resonance system.

Description of drawings

1 is a schematic diagram of the layout of each coil of a gradient coil in a magnetic resonance system;

2 is a perspective view of an embodiment of an X-axis gradient coil assembly in a gradient coil assembly in a magnetic resonance system;

FIG. 3 is a side view of the gradient coil assembly shown in FIG. 2;

Fig. 4 is the expanded schematic diagram of the main coil in the gradient coil assembly shown in Fig. 2;

Fig. 5 is the expanded schematic diagram of the shield coil in the gradient coil assembly shown in Fig. 2;

FIG. 6 is a perspective view of a connection assembly in the gradient coil assembly shown in FIG. 2;

FIG. 7 is a perspective view of the connecting assembly part shown in FIG. 6;

FIG. 8 is a front view of the connecting member shown in FIG. 7;

9 is a schematic diagram of the gradient coil assembly shown in FIG. 1 applied to a magnetic resonance system;

FIG. 10 is a schematic diagram of the gradient coil assembly shown in FIG. 2 connected to the water divider.

Wherein: 100, gradient coil assembly; 110, main coil; 111, first main coil; 112, second main coil; 120, shield coil; 121, first shield coil; 122, second shield coil; 130, connection assembly ; 1311, conductive water distribution pipe; 1312, inlet connector; 1313, outlet connector; 132, the first connecting part; 133, the second connecting part; 134, the third connecting part; 135, the electrode; 140, the water separator; 10, Scanner; 11. Scanning cavity; 20. Scanning bed; 30. Scanning object.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough 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 departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Back, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial , "radial", "circumferential" and other indicated orientations or positional relationships are 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, rather than indicating or implying the indicated device or Elements must have a particular orientation, be constructed and operate in a particular orientation and are therefore not to be construed as limitations of the invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the 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 level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or an intervening element may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

Referring to FIGS. 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 coils that generate the gradient magnetic field, so as to ensure the normal operation of the magnetic resonance system, while reducing the working temperature and ensuring the reliability of the magnetic resonance system. It should be noted that the gradient coil assembly 100 of the present invention is mainly applied to 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 positron emission type Computer tomography (Positron Emission Tomography, PET) equipment and MR equipment formed a multimodal system, magnetic resonance radiotherapy positioning system (MR Radiation Therapy, MR-RT).

It is understandable that the main coil and the shielding coil in the gradient coil of the current magnetic resonance system are connected through a joint, which leads to complicated process of the gradient coil, reduces the reliability of the gradient coil operation, and affects the performance of the magnetic resonance system. To this end, the present invention provides a novel gradient coil assembly 100 , which can ensure performance without adding joints, reduce the complexity of the structure, and ensure accurate imaging results. The specific structure of the gradient coil assembly 100 will be described in detail below.

Referring to FIGS. 1 to 8 , in one embodiment, the gradient coil assembly 100 includes a main coil 110 , a shield coil 120 and a connection assembly 130 . The main coil 110 may be arranged around to form a cylindrical shape, and the shielding coil 120 is located outside the main coil 110 and arranged concentrically with the main coil 110 . The main coil 110 and the shield coil 120 are directly connected at the bed end, and the main coil 110 and the shield coil 120 are connected at the service end through the connection assembly 130 . The direct connection between the main coil 110 and the shielding coil 120 and the indirect connection of the connection assembly 130 can make the gradient coil assembly 100 form a conductive loop, ensure the use performance of the gradient coil assembly 100, and enable the gradient coil assembly 100 to achieve corresponding functions.

The extension direction of the connection component 130 is the same as the surrounding direction of the main coil 110, such as being arranged concentrically with the main coil 110 and located at the ends of the main coil 110 and the shield coil 120, the connection component 130 is electrically connected to the main coil 110 and the shield coil 120, The connection assembly 130 is also used to transport cooling fluid. It is worth noting that, in the magnetic resonance system, the scanner has a bed end and a service end arranged oppositely. 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 far from the scanning bed.

The main coil 110 is provided in a hollow cylindrical shape, and the shielding coil 120 is also provided in a hollow cylindrical shape. The shielding coil 120 is sleeved on the outer side of the main coil 110 . That is to say, the main coil 110 and the shielding coil 120 are sleeved and 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 are substantially coincident 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, so as to prevent the magnetic field generated by the main coil 110 from interfering with the superconducting coil of the magnetic resonance system and ensure the reliability of the magnetic resonance system.

The connecting component 130 is located at the ends of the main coil 110 and the shielding coil 120 , and 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 to ensure the main coil 110 and shielded coil 120 can work normally. The connection assembly 130 can also realize the flow of cooling liquid while conducting electricity. During the process of the cooling liquid flowing in the connecting assembly 130 , the connecting assembly 130 can be cooled and the temperature of the connecting assembly 130 can be lowered.

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 electrically connected at the service end through the connection assembly 130 . The axes of the cylindrical main coil 110 and the cylindrical shield coil 120 coincide with the axes of the scanning cavity 11 . The main coil 110 and the shield coil 120 are directly electrically connected on one side of the bed end, and the main coil 110 and the shield coil 120 are electrically connected on the side of the service end through a connection assembly 130 to reduce the introduction of joints and reduce the structural complexity. It should be noted that in the present invention, the connecting component 130 connecting the main coil 110 and the shielding coil 120 is equivalent to the annular connecting wire of the current gradient coil structure.

In the gradient coil assembly 100 of the above-mentioned embodiment, the main coil 110 and the shielding coil 120 are connected at the service end through the connecting assembly 130, so that the gradient coil assembly 100 forms a conductive loop, which effectively solves the complicated process caused by the introduction of joints to connect the main coil and the shielding coil. Therefore, the complexity of the structure is reduced, the reliability of the gradient coil assembly 100 is ensured, and the performance of the magnetic resonance system is ensured.

In one embodiment, the connection assembly can also deliver cooling fluid. That is to say, the connecting assembly 130 can also transport coolant in the service end while electrically connecting the main coil 110 and the shielding coil 120 to reduce the working temperature of the connecting assembly 130 and prevent the end temperature from being too high to affect the imaging effect.

In one embodiment, the connection assembly 130 includes a first connection part 132 and a second connection part 133 . Both ends of the first connection member 132 are connected to the main coil 110 , one end of the second connection member 133 is used for external connection, and the other end of the second connection member 133 is connected to the shield coil 120 . The main coil 110 and the shield coil 120 are directly electrically connected at the bed end, the two ends of the first connection member 132 are connected to the main coil 110 at the bed end, and the second connection member 133 is connected to the shield coil 120 and the electrode 135, and the electrical connection is realized through the electrode 135 The power supply interface to the magnetic resonance system realizes the power supply of the main coil 110 and the shielding coil 120 .

Referring to FIGS. 3 , 6 to 8 , in one embodiment, at least one of the first connecting part 132 and the second connecting part 133 in the connecting assembly has an internal cooling flow channel, and the cooling flow channel is used for the flow of cooling liquid . The first connection part 132 and the second connection part 133 realize the connection between the main coil 110 and the shield coil 120, so that an electrical connection loop is formed between the main coil 110 and the shield coil 120, and the main coil 110 and the shield coil 120 are energized to work . At the same time, at least one of the first connecting part 132 and the second connecting part 133 has a cooling channel inside, which can cool the connecting assembly 130 , reduce the working temperature of the connecting assembly 130 , and improve the reliability of the connecting assembly 130 .

Optionally, one of the first connecting member 132 and the second connecting member 133 may have cooling flow channels, or two of the first connecting member 132 and the second connecting member 133 may have cooling flow channels. The source and flow direction of the coolant will be described in detail later.

Specifically, the main coil 110 and the shield coil 120 are directly electrically connected at the bed end, the two ends of the first connection member 132 are connected to the main coil 110 at the service end, one end of the second connection member 133 is connected to a shield coil 120, and the other end is connected to the The power supply interface of the magnetic resonance system. The other shielding coil 120 may be directly connected to the power supply interface of the magnetic resonance system, or may be connected indirectly, which will be described in detail later. The electrical connection relationship between the main coil 110 and the shield coil 120 is established through the first connection member 132 and the second connection member 133 , so that an electrical connection loop is formed between the main coil 110 and the shield coil 120 .

Referring to FIGS. 1 to 5 , in one embodiment, the main coil 110 includes a first main coil 111 and a second main coil 112 that are oppositely disposed, and both the first main coil 111 and the second main coil 112 are made of electrical conductors according to the design. It is wound in a certain shape, the projection of the first main coil 111 in the axial direction is a semicircle, and the projection of the second main coil 112 in the axial direction is a semicircle. The shielding coil 120 includes a first shielding coil 121 and a second shielding coil 122 arranged oppositely. The projection of the first shielding coil 121 in the axial direction is a semicircle, and the projection of the second shielding coil 122 in the axial direction is a semicircle. round. In addition, the first shield coil 121 is located outside the first main coil 111 , and the second main coil 112 is located outside the second shield coil 122 . The ends of the first main coil 111 and the second main coil 112 on the bed side are directly electrically connected to the ends of the first shield coil 121 and the second shield coil 122 on the bed side.

The ends of the first main coil 111 and the second main coil 112 at the service end are connected through the connection assembly 130 . The ends of the first shielding coil 121 and the second shielding coil 122 at the service end are respectively electrically connected through the connection assembly 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 service end through the connection assembly 130 . The power supply interface of the magnetic resonance system. Specifically, the first main coil 111 and the second main coil 112 are connected at the end of the service end through the first connecting member 132 . The end of the first shielding coil 121 at the service end is connected to the power supply interface through the second connecting member 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.

Optionally, the gradient coil assembly 100 further includes a mounting cylinder, which is provided in a hollow cylindrical shape. The mounting cylinder plays a bearing role for bearing each coil of the gradient coil assembly 100 . Specifically, the number of installation cylinders is two, the two installation cylinders are sleeved layer by layer, one installation cylinder is installed with the main coil 110, the other installation cylinder is installed with the shield coil 120, and the two installation cylinders are installed There is a preset spacing between them, as shown in Figure 2.

The first main coil 111 is installed at the 0° position, and the second main coil 112 is installed at the 180° position, as shown in FIG. In the view, the first main coil 111 and the second main coil 112 have semicircular shapes on the sides.

Referring to FIGS. 6 to 8 , in an embodiment, when at least one of the first connecting part 132 and the second connecting part 133 in the connecting assembly 130 has a cooling flow channel, the first connecting part 132 or the second connecting part 133 It includes a conductive water distribution pipe 1311, an inlet joint 1312 and an outlet joint 1313. The cooling flow channel is located in the conductive water distribution pipe 1311. The inlet joint 1312 and the outlet joint 1313 communicate with each other through the cooling flow channel, and the outlet joint 1313 is connected to the cooling layer assembly. The conductive water distribution pipe 1311 is the main structure of the connection assembly 130, and 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 , and a cooling layer assembly is arranged inside or outside the main coil 110 . The cooling layer assembly realizes the transmission of cooling liquid, and the cooling layer assembly inside the gradient coil assembly 100 will be described in detail later.

The conductive water distribution pipe 1311 has an outlet joint 1313 and an inlet joint 1312, and the conductive water distribution pipe 1311 has a cooling flow channel. The inlet joint 1312 is used to deliver the cooling liquid to the cooling flow channel of the conductive water distribution pipe 1311 , the cooling flow channel transports the cooling liquid to the outlet joint 1313 , and sends the cooling liquid to the cooling layer assembly through the outlet joint 1313 . Optionally, the outlet joint 1313 and the inlet joint 1312 are disposed on the outer wall of the conductive water distribution pipe 1311 and protrude 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 joint 1312 extends in a first direction (a direction away from the main coil 110 in the figure), and the outlet joint 1313 extends in a second direction (a direction toward the main coil 110 in the figure).

Optionally, the conductive water distribution pipe 1311 is made of non-magnetic metal with good electrical conductivity. Further, the conductive water distribution pipe 1311 is made of materials such as copper and aluminum.

In one embodiment, the number of outlet joints 1313 is multiple, and the plurality of outlet joints 1313 are arranged at intervals in the conductive water distribution pipe 1311 . The outlet joint 1313 is used to send out the cooling liquid in the conductive water distribution pipe 1311 . The cooling liquid in the conductive water distribution pipes 1311 can be respectively outputted through the plurality of outlet joints 1313 . Optionally, the plurality of outlet joints 1313 are arranged along the same direction; of course, in other embodiments of the present invention, the plurality of outlet joints 1313 can also be arranged in a staggered manner.

In one embodiment, the cooling flow channel includes a plurality of cooling cavities, the plurality of cooling cavities are arranged layer by layer along the radial direction, and two adjacent cooling cavities are independently arranged and communicated through through holes. The first cooling cavity communicates with the inlet joint 1312 , and the last cooling cavity communicates with the outlet joint 1313 . The inlet joint 1312 transports the cooling liquid to the first cooling cavity, and is transported step by step through the through holes of the cooling cavity, transported to the last cooling cavity, and finally sent out through the outlet joint 1313 . In this way, it can be ensured that the flow of the cooling liquid output by each outlet joint 1313 is consistent, and the cooling temperature can be balanced, thereby ensuring the cooling effect.

In one embodiment, the first connecting member 132 or the second connecting member 133 has an arc-shaped hollow structure, and both ends of the first connecting member 132 or the second connecting member 133 are closed. The first connection part 132 or the second connection part 133 is arranged in an arc shape, so that the center of the connection assembly 130 can be coincident with the center of the main coil 110 and the shield coil 120 , so that the first connection part 132 and the second connection part 133 can be installed At the ends of the main coil 110 and the shielding coil 120, no internal space is occupied, which facilitates the arrangement of other components of the magnetic resonance system. Both ends of the first connecting part 132 and the second connecting part 133 are closed to avoid leakage of the cooling liquid in the corresponding channels, and to ensure the use performance.

In one embodiment, the inlet joint 1312 protrudes from the end of the gradient coil assembly 100 , such as the inlet joint 1312 is exposed to the outside of the gradient coil assembly 100 to form the barrel or extends to the end of the barrel for connecting with an external cooling source. That is, the inlet fitting 1312 has a certain length. In this way, after the inlet joint 1312 is disposed on the conductive water distribution pipe 1311, the inlet joint 1312 will be exposed to the outside of the gradient coil assembly 100, and the inlet joint 1312 can be connected to an external cooling source. It can be understood that the external cold source is used to realize the circulating cooling of the cooling liquid. The output end of the external cold source is connected to the inlet joint 1312 for conveying the cooling liquid to the conductive water distribution pipe 1311, and the external cold source is also recovered through the output end. Coolant, realize the recycling of coolant. Optionally, the cooling liquid is deionized cooling water.

In one embodiment, the gradient coil assembly 100 further includes a cooling layer assembly, the cooling layer assembly includes a plurality of cooling layers, and the plurality of cooling layers are respectively disposed near the shield coil 120 and the main coil 110 , such as disposed on the main coil 110 and the shield coil 120 . On the inner side or outer side, the cooling layer is used to cool the shield coil 120 and the main coil 110 . The connecting assembly 130 connects each cooling layer assembly, and is used for the cooling liquid delivered to each cooling layer.

In one embodiment, the gradient coil assembly 100 further includes an insulating layer, and the insulating layer coats the outer surface of the shield coil 120 and the cooling layer assembly to form a cylinder, or the insulating layer coats the outer surface of the main coil 110 and the cooling layer assembly to form a cylinder The outer surface of the main coil 110 , the intermediate layer cooling layer component and the outer layer shielding coil 120 are simultaneously covered by an insulating layer to form a cylindrical body. The insulating layer is usually made of materials with high dielectric strength, such as epoxy resin, glass cloth, and other insulating materials.

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

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 shield coil 120 to cool the main coil 110 and the shield 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. The heat dissipation of the main coil 110 and the shielding coil 120 is small, and one or two cooling layers can be provided. When the heat dissipation of 120 is larger, more cooling layers can be set.

Each cooling layer protrudes from the connecting pipe at the service end and is connected to the outlet joint 1313 of the conductive water distribution pipe 1311, so that the cooling liquid in the conductive water distribution pipe 1311 is sent to each cooling layer through the outlet joint 1313, and the main cooling layer is realized through the cooling layer. Cooling of the coil 110 and the shielded coil 120 . It can be understood that there may be multiple connection pipelines for each cooling layer, and multiple connection pipelines are connected to the outlet joint 1313 .

Referring to FIGS. 2 to 5 , in one embodiment, the connection assembly 130 further includes a third connection part 134 , one end of the third connection part 134 is connected to the shielding coil 120 , and the other end of the third connection part 134 is connected to the magnetic resonance through the electrode 135 The power supply interface of the system. That is, both ends of the shield coil 120 are connected to the outside through one connection member, respectively.

The connection relationship between the connection assembly 130 and the main coil 110 and the shield coil 120 will be described in detail below. The connection assembly 130 includes a first connection part 132 , a second connection part 133 and a third connection part 134 . The main coil 110 and the shield coil 120 are directly electrically connected at the bed end, the two ends of the first connection part 132 are connected to the main coil 110 at the bed end, the second connection part 133 and the third connection part 134 are connected to the shield coil 120 and the electrode 135, The electrodes 135 are used to realize the electrical connection to the power supply interface of the magnetic resonance system, so as to realize the power supply of the main coil 110 and the shield coil 120 .

The ends of the first main coil 111 and the second main coil 112 at the service end are connected through the first connecting member 132 . The first shielding coil 121 is connected to the second connecting part 133 at the end of the service end, the second shielding coil 122 is connected to the third connecting part 134 at the end of the serving end, and the second connecting part 133 and the third connecting part 134 also pass through. The electrodes 135 are connected to the power supply interface of the magnetic resonance system.

Optionally, at least one of the first connection part 132 , the second connection part 133 and the third connection part 134 has a cooling flow channel. Optionally, one of the first connecting part 132, the second connecting part 133 and the third connecting part 134 can be used as the liquid inlet pipeline. At this time, a water separator can be added to the connecting pipeline of the outlet of each cooling layer. The water heater introduces the endothermic cooling liquid into the external cooling source. Of course, two of the first connecting part 132 , the second connecting part 133 and the third connecting part 134 may also have cooling channels, one of which is used as a liquid inlet pipe and the other is used as a liquid outlet pipe, respectively connecting the cooling channels. Floor entrance and exit. It is also possible that all three of the first connection part 132 , the second connection part 133 and the third connection part 134 have cooling channels.

In the present invention, only the first connecting member 132 and the second connecting member 133 have cooling channels as an example for description, the principles and layouts of other arrangements and the principle that the first connecting member 132 and the second connecting member 133 have cooling channels and the layout are substantially the same, and will not be repeated here.

Specifically, the second connection part 133 and the third connection part 134 have cooling channels, the second connection part 133 is the liquid inlet pipeline, the third connection part 134 is the liquid outlet pipeline; the inlet joint of the second connection part 133 1312 is connected to the liquid outlet of the external cooling source, the plurality of outlet joints 1313 of the second connecting member 133 are respectively connected to the connecting pipelines of the inlets of each cooling layer; the outlet joints 1313 of the third connecting member 134 are connected to the connecting pipelines of the outlets of each cooling layer , the inlet joint 1312 of the third connecting member 134 is connected to the liquid inlet end of the external cooling source.

The cooling liquid in the external cooling source enters into the conductive water distribution pipe 1311 of the second connection part 133 through the inlet joint 1312 , and is transported to each cooling layer through the outlet joint 1313 of the second connection part 133 . Each cooling layer performs cooling and heat exchange on the corresponding main coil 110 and the shielding coil 120 respectively. The heat-absorbing cooling liquid flows out from the cooling layer and is transported to the conductive water distribution pipe 1311 of the third connecting member 134 through the outlet joint 1313 of the third connecting member 134 , and the heat-absorbing cooling liquid is transferred through the inlet joint 1312 of the third connecting member 134 . The coolant is sent to the external cooling source.

In one embodiment, the second connecting member 133 and the third connecting member 134 are located on the same circumference. This can counteract the Lorentz force and achieve a better force balance effect. The first connecting member 132 and the second connecting member 133 are arranged concentrically, and the first connecting member 132 is located at the radial inner side or the radial outer side of the second connecting member 133; Orientation interval setting. In this embodiment, the first connecting member 132 is located radially inward of the second connecting member 133 .

The gradient coil assembly 100 of the present invention realizes the electrical connection between the main coil 110 and the shield coil 120 by using the connecting assembly 130 capable of conveying the cooling liquid as the end connecting line between the main coil 110 and the shield coil 120 . The gradient coil assembly 100 is provided with a first connection part 132 , a second connection part 133 and a third connection part 134 at the service end, and at least one of the first connection part 132 , the second connection part 133 and the third connection part 134 has cooling inside. runner. Specifically, the conductive water distribution pipes 1311 of the first connection part 132 , the second connection part 133 and the third connection part 134 can not only be electrically connected but also can transport cooling liquid. The first connection part 132 , the second connection part 133 and the third connection part 133 The heat generated during the operation of the component 134 is directly taken away by the cooling fluid, avoiding temperature rise.

The first connecting part 132, the second connecting part 133 and the third connecting part 134 used in the gradient coil assembly 100 of the present invention integrate the current annular connecting wire inside the coil with the water separator, which realizes the conductive function and reduces the The temperature of the connection assembly 130, after using the first connection part 132, the second connection part 133 and the third connection part 134 as the annular connection wire of the coil, forms a conductive link with the main coil 110 and the shield coil 120, the first connection part 132 , the heat generated by the second connecting part 133 and the third connecting part 134 can be taken away by the cooling liquid flowing inside, which solves the problem of heating of the annular connecting wire. Moreover, it saves space and avoids the interference problem caused by the introduction space of the water separator.

Referring to FIG. 10, in another embodiment of the present invention, the gradient coil assembly 100 further includes a water separator 140, one end of the water separator 140 is connected to an external cooling source, and the other end of the water separator 140 is connected to the gradient coil assembly Cooling layer assembly inside 100. The cooling liquid in the external cooling is respectively delivered 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, which can reduce the temperature of the main coil 110 and the shielding coil 120 while reducing the temperature of the connecting assembly 130 to ensure the reliability of the working of the connecting assembly 130 .

In this case, the connecting assembly 130 may only connect the main coil 110 and the shielding coil 120 , and no cooling channel is provided inside the connecting assembly 130 . That is, the first connecting member 132 , the second connecting member 133 and the third connecting member 134 are simple conductive connecting members, and no cooling flow channel is provided inside. The cooling liquid delivered by the water separator 140 cools the connecting assembly 131 to ensure the reliability of the working of the connecting assembly 131 .

It should be noted that the gradient coil assembly 100 in this embodiment has the same structure as that of the gradient coil assembly 100 in the above-mentioned embodiment except that the water separator 140 is used to replace the cooling flow channel of the connecting assembly 130 , which is not omitted here. Repeat them one by one.

Optionally, the water distributor 140 includes a water inlet pipeline, a water distribution main body and a plurality of water outlet pipelines, the water inlet pipeline is connected to the water distribution main body, the water distribution main body is hollow, and the multiple water outlet pipelines are also connected to the water distribution main body. . The water inlet pipeline is also connected to the external cold source, and the plurality of water outlet pipelines are respectively connected to each connection pipeline in the cooling layer. The water inlet pipeline transports the cooling liquid from the external cold source to the water distribution main body, distributes the cooling liquid through the water distribution main body, and transports the cooling liquid to each water outlet pipeline respectively, and then to the corresponding cooling layer to realize the corresponding Cooling of position components.

Optionally, each cooling layer corresponds to at least one water separator. In this way, enough cooling liquid can be delivered to the cooling layer to ensure the cooling effect of the cooling layer.

Referring to FIG. 1 , FIG. 2 and FIG. 9 , the present invention further provides a magnetic resonance system. The magnetic resonance system includes a scanner 10 and a couch 20 . The scanner 10 includes a superconducting magnet, a gradient coil assembly 100, and a radio frequency transmitting coil that are sequentially arranged from the right outside to the inside. ) extended scan cavity 11. The scan object 30 is carried on the scan bed 20 into or out of the scan chamber 11 for medical imaging (performing a scan imaging operation). 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 opposite front and rear ends, and the rear end of the scanner 10 is coupled to the scan bed 20 . In this embodiment, let the back end of the scanner 10 be the patient end/bed end, and let the front end of the scanner 10 be the server end.

The gradient coil assembly 100 includes a main coil 110 , a shielding coil 120 and a connection assembly 130 . The shield coil 120 is located outside the main coil 110 and is disposed concentrically with the main coil 110 . The connection component 130 is disposed concentrically with the main coil 110 , and the connection component 130 electrically connects the main coil 110 and the shield coil 120 . The connection assembly 130 includes a first connection part 132 and a second connection part 133 . The structure of the gradient coil assembly 100 used in the magnetic resonance system of the present embodiment is substantially the same as that of the gradient coil assembly 100 in the above-mentioned embodiments, and details are not repeated here.

After the gradient coil of the magnetic resonance system of the present invention is set to the gradient coil assembly 100 of the above-mentioned embodiment, the electrical connection effect can be ensured, and the cooling of the end of the gradient coil can also be realized, so as to ensure that the gradient coil can work normally, thereby ensuring the imaging results. accuracy.

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 shield coil 120 . The six sets of coils are assembled concentrically together to form a generally cylindrical structure in which the scan bed 20 can be controlled and moved in and out of the gradient coils (within the cylindrical structure formed by the gradient coils). The main coil 110GX of the X-axis coil assembly includes two semicircular coils, GX1 and GX2, where 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 at 90° and GY2 is at 270°. The shielding coil SX of the X-axis coil assembly and the shielding coil SY of the Y-axis coil assembly have the same structure, which will not be repeated here. The main coil 110GZ and the shielding coil 120SZ of the Z-axis coil assembly are of helical tube structure.

After unfolding the GX horizontally, it is shown in Figure 4. The GX1 and GX2 coils are connected through the first connecting member 132 . After expanding the SX horizontally, it is shown in Figure 5. SX1 is connected to the electrode 135 through the second connection part 133 , and SX2 is connected to the electrode 135 through the third connection part 134 at the service end. The two electrodes 135 and the output cables of the gradient coils are connected to the power supply interface of the magnetic resonance system. The structure that the first connecting member 132 and the second connecting member 133 have cooling channels has been mentioned above, and will not be repeated here.

It is worth noting that the specific structure and working principle of the connection method between the main coil and the shield coil included in the Y-axis coil assembly and the connection method between the main coil and the shield coil included in the X coil assembly are substantially the same, and will not be repeated here. . After the gradient coil assembly 100 is used in the magnetic resonance system of the present invention, the temperature of the gradient coil can be reduced while ensuring the use performance of the gradient coil, thereby ensuring the reliability of the gradient coil.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (10)

1. A gradient coil assembly, characterized in that, comprising: main coil; a shield coil, located outside the main coil, the main coil and the shield coil are directly connected at the bed end; and a connection component, located at the end of the main coil and the shield coil, the connection component connects the main coil and the shield coil at the service end; wherein the connection component includes a first connection part and a second connection The two ends of the first connecting member are connected to the main coil, one end of the second connecting member is used for external connection, and the other end of the second connecting member is connected to the shield coil. 2 . The gradient coil assembly according to claim 1 , wherein the first connecting part or the second connecting part has a cooling channel inside. 3 . 3. The gradient coil assembly according to claim 2, wherein the connection assembly comprises 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 connected to the The outlet fitting communicates through the cooling flow channel. 4 . The gradient coil assembly according to claim 3 , wherein the number of the outlet joints is plural, and the plurality of the outlet joints are arranged in the conductive water distribution pipe at intervals. 5 . 5 . The gradient coil assembly according to claim 2 , wherein the first connecting part or the second connecting part is an arc-shaped hollow structure, and the first connecting part or the second connecting part Both ends of the part are closed. 6 . The gradient coil assembly according to claim 1 , wherein the connection assembly further comprises a third connection part, one end of the third connection part is used for connecting with the outside, and the other end of the third connection part is used for connecting with the outside. 7 . One end is respectively connected to the shielding coil, and the second connection part and the third connection part are located on the same circumference; The first connecting member and the second connecting member are arranged concentrically, and the first connecting member is located on the radially inner side or the radially outer side of the second connecting member; The two connecting parts are spaced apart along the axial direction. 7 . The gradient coil assembly according to claim 1 , wherein the gradient coil assembly further comprises a water separator, and the water separator is connected to an external cooling source and is used for delivering cooling liquid to cool the main coil, the shielding coil and the connecting member. 8. The gradient coil assembly according to any one of claims 3 to 7, wherein the gradient coil assembly further comprises a cooling layer assembly, the cooling layer assembly comprising a plurality of cooling layers, a plurality of the cooling layers The layers are respectively arranged close to the shielding coil and the main coil, and the cooling layer is used for cooling the shielding coil and the main coil; The connecting assembly connects each of the cooling layer assemblies, and is used for cooling liquid delivered to each of the cooling layers. 9. A magnetic resonance system, characterized in that, comprising: Scanner with oppositely arranged bedside and server side; a scanning bed, coupled with the scanner at the end of the bed; The scanner includes a gradient coil assembly including: main coil; a shield coil, located outside the main coil; and a connection component, disposed at the service end and electrically connecting the main coil and the shielding coil; The connection assembly includes a first connection part and a second connection part, two ends of the first connection part are connected to the main coil, one end of the second connection part is used for connecting with the outside, and the second connection part The other end of the shielding coil is connected. 10 . The magnetic resonance system according to claim 9 , wherein 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. 11 .

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