Magnetic resonance coil assembly and magnetic resonance device

Abstract

The embodiment of the utility model provides a magnetic resonance coil assembly and a magnetic resonance device. The magnetic resonance coil assembly comprises a first coil array and a second coil array. Wherein when the first coil array and the second coil array are configured to be oppositely arranged and used for detecting magnetic resonance signals, projections of two adjacent coils in projections of the coils in the first coil array and the coils in the second coil array on a plane perpendicular to the first direction are not completely overlapped.

Description

TECHNICAL FIELD

[0001] The present specification relates to the technical field of magnetic resonance, and in particular, to a magnetic resonance coil assembly and a magnetic resonance device. BACKGROUND

[0002] Magnetic resonance imaging (MRI) is a widely used medical scanning imaging technology. When scanning a biological body such as a human or animal body, in order to obtain full coverage, relatively uniform signal-to-noise ratio, and good up-down acceleration performance, it is necessary to cover the coils at the upper and lower parts of the scanning object at the same time. However, there is coupling between the upper and lower coil arrays, the stronger the coupling, the worse the signal-to-noise ratio, and it often destroys the uniformity of the image. At present, the upper and lower coil arrays used for magnetic resonance scanning of a biological body are usually composed of annular elements, and the loop is only isolated by a preamplifier decoupling, which has poor decoupling effect.

[0003] Therefore, it is desirable to provide a magnetic resonance coil assembly and a magnetic resonance device to improve the decoupling effect of the upper and lower coil arrays of the magnetic resonance scanning. SUMMARY

[0004] One of the embodiments of the present specification provides a magnetic resonance coil assembly. The magnetic resonance coil assembly includes a first coil array and a second coil array. When the first coil array and the second coil array are configured to be oppositely arranged along a first direction for detecting a magnetic resonance signal, adjacent two coil projections in the projection of the coils in the first coil array and the coils in the second coil array on a plane perpendicular to the first direction do not completely overlap.

[0005] In some embodiments, the projection of the first coil array and the second coil array on the plane can be symmetrical along a first axis and / or a second axis, the first axis is parallel to a second direction, and the second axis is perpendicular to the second direction, the second direction is parallel to the arrangement direction of the coils in the first coil array or the second coil array.

[0006] In some embodiments, the projection of the center of the first coil array and the center of the second coil array on the plane perpendicular to the first direction can coincide.

[0007] In some embodiments, the coil types in the first coil array and the second coil array can include at least two types.

[0008] In some embodiments, the at least two coil types can include annular coils and quadrature coils.

[0009] In some embodiments, the first coil array can include two loop coils and one quadrature coil, the second coil array can include one loop coil and two quadrature coils, or the second coil array can include two quadrature coils.

[0010] In some embodiments, the number of same type coils in the first coil array and the second coil array can be different.

[0011] In some embodiments, the same type coils in the first coil array and the second coil array can be arranged alternately.

[0012] In some embodiments, the center positions of the same type coils in the first coil array and the second coil array can be different.

[0013] In some embodiments, the magnetic resonance coil assembly can further include a first support and a second support, the first coil array is arranged on the surface of the first support, and the second coil array is arranged on the surface of the second support.

[0014] One of the embodiments of the present specification provides a magnetic resonance device, the device including the magnetic resonance coil assembly.

[0015] One of the embodiments of the present specification provides a magnetic resonance scanning method, the method receiving a radio frequency signal using the magnetic resonance coil assembly.

[0016] At present, the upper and lower coil arrays for animal MRI are composed of loop elements, and the loop is only isolated by preamplifier decoupling. In addition to preamplifier decoupling, there is no other design to reduce the coupling between the upper and lower coil arrays. The magnetic resonance coil assembly provided in some embodiments of the present specification realizes decoupling by using the quadrature characteristics of the upper and lower array coils through the configuration of the upper and lower coil arrays (for example, arrangement, coil type, coil number, etc.), can more effectively control the coupling, ensure the signal-to-noise ratio and uniformity of the coil, at the same time bring excellent imaging acceleration performance, improve the stability and reliability of the output of the magnetic resonance equipment; by independently configuring the coils, each coil can independently receive signals in its respective direction, improving the signal reception efficiency and improving the signal-to-noise ratio of the overall signal, thereby improving the speed of magnetic resonance scanning imaging. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present specification will be further illustrated in the form of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, the same numbers represent the same structures, wherein:

[0018] Figure 1is a schematic diagram of an application scenario of an exemplary magnetic resonance system according to some embodiments of the present specification;

[0019] Figure 2A , Figure 2B and Figure 2C is a schematic diagram of an exemplary magnetic resonance coil assembly according to some embodiments of the present specification;

[0020] Figure 3 is a schematic diagram of an exemplary magnetic resonance coil assembly according to some embodiments of the present specification;

[0021] Figure 4 is a schematic diagram of an exemplary magnetic resonance coil assembly according to some embodiments of the present specification;

[0022] Figure 5 is a schematic diagram of an exemplary magnetic resonance coil assembly according to some embodiments of the present specification;

[0023] Figure 6 is a schematic diagram of an exemplary magnetic resonance coil assembly according to some embodiments of the present specification. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present specification, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some examples or embodiments of the present specification, and for those skilled in the art, the present specification can also be applied to other similar scenarios without creative labor. Unless it is clear from the language context or otherwise indicated, the same reference numbers in the drawings represent the same structure or operation.

[0025] It should be understood that the "system", "device", "unit" and / or "module" used herein is a method for distinguishing different components, elements, parts, sections or assemblies at different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

[0026] As shown in the specification and claims, unless the context clearly indicates otherwise, "one", "a", "an", and / or "the" do not refer to the singular, but can also include the plural. Generally, the terms "comprise" and "include" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements.

[0027] Flowcharts are used in the present specification to illustrate the operations performed by systems in accordance with embodiments of the present specification. It should be understood that the preceding or following operations are not necessarily performed in the exact order shown. Rather, various steps can be handled in reverse order, or at the same time. Also, other operations can be added to, or removed from, these processes, or one or more operations can be omitted.

[0028] Figure 1 is a schematic diagram of an application scenario of an exemplary magnetic resonance system according to some embodiments of the present specification. As shown in Figure 1 some embodiments, the magnetic resonance system 100 can include a medical imaging device 110, a processing device 120, a storage device 130, a terminal 140, and a network 150.

[0029] The medical imaging device 110 refers to a device that medically reproduces the structure inside the human body as an image using different media. In some embodiments, the medical imaging device 110 can be any medical device that uses magnetic resonance technology for imaging, such as a single modality magnetic resonance (MR) scanner or a multi-modality MR scanner (e.g., Positron Emission Tomography-Magnetic Resonance (PET-MR), Computed Tomography-Magnetic Resonance (CT-MR), etc.). The MR scanner can scan an object located in its detection area and generate a magnetic resonance signal related to the object. In the present application, “object” and “subject” can be used interchangeably. For example only, the object can include a patient, an artificial object (e.g., a phantom, etc.), an animal, etc. For another example, the object can include a specific part of an animal and a phantom of the specific part. For example, the object can include a head, a brain, a neck, a body, a shoulder, an arm, a chest, a heart, a stomach, a blood vessel, soft tissue, a knee, a foot, etc. of an animal, a phantom of the above-mentioned parts, or any combination thereof. In some embodiments, the MR scanner can be an open bore scanner. In the present application, Figure 1 The X-axis, Y-axis, and Z-axis shown in FIG. 1 can form an orthogonal coordinate system. Figure 1 The X-axis shown in FIG. 1 is a left-right direction, the Y-axis is an up-down direction, and the Z-axis is an axial direction of a scan cavity (or a scan bore) of the MR scanner. As shown in Figure 1 The positive X-direction along the X-axis can be a right-to-left direction of the MR scanner as seen from a direction facing the front of the MR scanner; Figure 1 The positive Z-direction along the Z-axis shown in FIG. 1 can refer to a direction in which the object moves out of the scan cavity of the MR scanner, and the Z-direction is parallel to the axial direction of the MR scanner; Figure 1The positive Y direction along the Y axis shown in the middle can be a lower-to-upper direction of the MR scanner.

[0030] The MRI scanner can include a magnetic field system, a radio frequency (RF) system, etc.

[0031] The magnetic field system can include a main magnet (e.g., a resistive magnet, a superconducting magnet, etc.), a gradient coil, etc. The main magnet can be used to generate a first magnetic field (or referred to as a main magnetic field) that can be applied to an object (also referred to as a subject) exposed in the field. The gradient coil can be located in the main magnet. The gradient coil can generate a second magnetic field (or referred to as a gradient field). The second magnetic field can be superimposed on the main field generated by the main magnet and distort the main field such that the magnetic orientation of the protons of the object can vary depending on their position in the gradient field, thereby encoding spatial information into the MR signals produced by the regions of the imaged object.

[0032] The radio frequency system can include a radio frequency transmit unit, a radio frequency receive unit, and a radio frequency coil assembly. The radio frequency transmit unit is used to provide various radio frequency pulses required by the scanning sequence under the action of the radio frequency controller. The radio frequency receive unit is used to receive the magnetic resonance signals generated by the human body, and after a series of processing such as amplification, mixing, filtering, detection, A / D conversion, etc., it is sent to the data acquisition unit.

[0033] The radio frequency coil assembly (also referred to as a magnetic resonance coil assembly) can include a radio frequency receive coil and a radio frequency transmit coil. The radio frequency transmit coil receives the radio frequency transmit unit RF signal to excite the nuclear spins. The radio frequency receive coil is used to receive the MR signals (e.g., echoes). After excitation, the MR signals generated by the object can be sensed by the radio frequency receive coil. The specific structure of the radio frequency receive coil can be as described in other embodiments of the present application, such as the magnetic resonance coil assembly shown in Figure 2A 、 Figure 2B 、 Figure 2C and Figures 3-6 .

[0034] In some embodiments, the gradient coil and the radio frequency coil assembly can be positioned circumferentially relative to the object. Those of ordinary skill in the art can understand that the main magnet, the gradient coil, and the radio frequency coil assembly can be arranged in various configurations around the object.

[0035] The medical imaging device 110 provided above is only for illustrative purposes, and is not a limitation on its scope. More descriptions about the radio frequency coil can refer to the magnetic resonance coil assembly shown in some embodiments of the present application. In some embodiments, the medical imaging device 110 can exchange data and / or information with other components (e.g., the processing device 120, the storage device 130, the terminal 140) in the magnetic resonance system 100 through the network 150 or directly.

[0036] The processing device 120 can process data and / or information obtained from other devices or system components. In some embodiments, the processing device 120 can perform a magnetic resonance scanning method as shown in some embodiments of the present specification by the medical imaging device 110, where the method uses a magnetic resonance coil assembly as shown in some embodiments of the present specification to transmit and / or receive radio frequency signals. In some embodiments, the processing device 120 can include one or more sub-processing devices (e.g., single-core processing devices or multi-core multi-threaded processing devices).

[0037] The storage device 130 can store data or information generated by other devices. In some embodiments, the storage device 130 can store data and / or information acquired by the medical imaging device 110, such as scan data, etc. In some embodiments, the storage device 130 can store data and / or information processed by the processing device 120, such as reconstructed images, etc. The storage device 130 can include one or more storage components, each of which can be a standalone device or a part of other devices. The storage device can be local or implemented through the cloud.

[0038] The terminal 140 can control the operation of the medical imaging device 110. A physician can issue operation instructions to the medical imaging device 110 through the terminal 140 to make the medical imaging device 110 complete a specified operation, such as scanning and imaging a living body (e.g., a human body, an animal body, etc.). In some embodiments, the terminal 140 can instruct the processing device 120 to perform a magnetic resonance scanning method as shown in some embodiments of the present specification. In some embodiments, the terminal 140 can be one or any combination of a mobile device 140-1, a tablet computer 140-2, a laptop computer 140-3, a desktop computer, and other devices with input and / or output functions.

[0039] The network 150 can connect components of the system and / or connect the system with external resource parts. The network 150 enables communication between components and between the system and other parts outside the system, facilitating exchange of data and / or information. In some embodiments, one or more components (e.g., the medical imaging device 110, the processing device 120, the storage device 130, the terminal 140) in the magnetic resonance system 100 can send data and / or information to other components through the network 150. In some embodiments, the network 150 can be any one or more of a wired network or a wireless network.

[0040] It should be noted that the foregoing description is only for the purpose of illustration, and is not intended to limit the scope of the present description. Various changes and modifications can be made to the exemplary embodiments described in the present description under the guidance of persons of ordinary skill in the art. The features, structures, methods and other characteristics of the exemplary embodiments described in the present description can be combined in various ways to obtain additional and / or alternative exemplary embodiments. For example, the processing device 120 can be based on a cloud computing platform, such as a public cloud, a private cloud, a community cloud, and a hybrid cloud, etc. However, these changes and modifications will not depart from the scope of the present description.

[0041] Figure 2A , Figure 2B and Figure 2C is a schematic diagram of an exemplary magnetic resonance coil assembly according to some embodiments of the present description. As shown in Figure 2A , the magnetic resonance coil assembly 200 includes a first coil array 210 and a second coil array 220. It should be noted that Figure 2A the shapes of the first coil array 210 and the second coil array 220 in

[0042] The magnetic resonance coil assembly 200 is a component for receiving radio frequency signals in a magnetic resonance device (e.g., the medical imaging device 110). The first coil array 210 includes one or more coils arranged in a predetermined rule to form the first coil array 210 (e.g., the first coil array 310, the first coil array 410, the first coil array 510, the first coil array 610); the second coil array 220 includes one or more coils arranged in a predetermined rule to form the second coil array 220 (e.g., the second coil array 320, the second coil array 420, the second coil array 520, the second coil array 620).

[0043] The first coil array 210 and the second coil array 220 can be configured to be arranged (e.g., stacked, etc.) relative to each other along a first direction 230, and the first coil array 210 and the second coil array 220 arranged relative to each other can form an accommodation space (e.g., a cylindrical accommodation space between the first coil array 210 and the second coil array 220 as shown in Figure 2B , for accommodating a scan object. Wherein the first direction 230 is perpendicular to the plane on which the first coil array 210 or the second coil array 220 is located.

[0044] It should be noted that Figure 2AThe first coil array 210 and the second coil array 220 in the diagram are both planar, used only as examples and not as a limitation on their shapes. The shape of either the first coil array 210 or the second coil array 220 can be a curved surface, a plane, etc. Taking the first coil array 210 as an example, when the first coil array 210 is a symmetrical curved surface, the plane containing the first coil array 210 can be a tangent plane at the center 215 of the first coil array 210; when the first coil array 210 is a plane, the plane containing the first coil array 210 is simply the plane in which the first coil array 210 is located. The plane containing the second coil array 220 is similar to the plane containing the first coil array 210, and will not be described further here. In some embodiments, the first direction 230 can be the straight line connecting the center 215 of the first coil array 210 and the center 225 of the second coil array 220.

[0045] In some embodiments, the first direction 230 may be perpendicular to the intermediate plane 240 between the first coil array 210 and the second coil array 220. For example, as Figure 2A As shown, the intermediate plane 240 can be a plane parallel to the plane where the first coil array 210 is located and the plane where the second coil array 220 is located, and is equidistant from the plane where the first coil array 210 is located and the plane where the second coil array 220 is located. The intermediate plane 240 passes through the midpoint 245 of the line connecting the center 215 of the first coil array 210 and the center 225 of the second coil array 220, and is perpendicular to the first direction 230.

[0046] In some embodiments, the projections of the center 215 of the first coil array 210 and the center 225 of the second coil array 220 onto a plane perpendicular to the first direction 230 can coincide. For example, as Figure 2A As shown, the projections of the center 215 of the first coil array 210 and the center 225 of the second coil array 220 onto the plane 240 perpendicular to the first direction 230 are both point 245.

[0047] like Figure 1 and Figure 2AAs shown in the coordinate system, in some embodiments, when the first coil array 210 and the second coil array 220 are arranged opposite each other along the first direction 230, the plane containing the first coil array 210 and the plane containing the second coil array 220 are approximately parallel. Therefore, the intermediate plane can be a plane composed of the X-axis and Z-axis in a three-dimensional spatial coordinate system (with the origin at point O), and the first direction 230 is the Y-axis perpendicular to this plane. The first coil array 210 and the second coil array 220 are arranged opposite each other along the first direction 230. Along the first direction 230, the first coil array 210 is above the second coil array 220 and can be referred to as the upper coil array, while the second coil array 220 is below the first coil array 210 and can be referred to as the lower coil array. In some embodiments, the positions of the first coil array 210 and the second coil array 220 can be interchanged. For example, the first coil array 210 can be below and the second coil array 220 can be above, i.e., the lower coil array is the first coil array 210, and the upper coil array is the second coil array 220.

[0048] In some embodiments, the intermediate plane 240 can be other surfaces in a three-dimensional spatial coordinate system, such as a plane composed of the Y-axis and Z-axis. In this case, the first direction 230 is a direction perpendicular to this plane. As an example only, if the plane containing the first coil array 210 and the second coil array 220 is a plane composed of the Y-axis and Z-axis, then the first direction 230 is the X-axis.

[0049] In some embodiments, when the magnetic resonance coil assembly 200 is used for MR scanning, the first coil array 210 and the second coil array 220 can be placed along a first direction 230 on both sides of the scanned object (e.g., left and right sides, or top and bottom sides). Figure 1 As shown, when the object to be scanned lies flat on the scanning bed, the first coil array 210 and the second coil array 220 can be placed along the left and right sides of the object, with the intermediate plane 240 being a plane formed by the Y-axis and Z-axis, and the first direction 230 being parallel to the X-axis direction; the first coil array 210 and the second coil array 220 can also be placed along the top and bottom sides of the object, with the intermediate plane 240 being a plane formed by the X-axis and Z-axis, and the first direction 230 being parallel to the Y-axis direction. As described herein, the top and bottom sides of the object can be the front and back sides of the object; the front and back sides of the object can be the head and feet sides of the object; the left and right sides of the object can be the left and right sides of the object's body (e.g., the left and right feet sides).

[0050] The two adjacent coil projections in the projections of the coils in the first coil array 210 and the coils in the second coil array 220 on the plane perpendicular to the first direction 230 do not completely overlap. As described herein, the two adjacent coil projections refer to that there is an overlapping part between the two coil projections or there is no other coil projection between the two coil projections, and such two coils are adjacent coils. For example, as shown in FIG. 3, the two annular coil projections in the first coil array 310 can partially overlap with the two orthogonal coil projection in the second coil array 320 respectively, and then any one of the annular coils and any one of the orthogonal coils are adjacent coils. For another example, the two annular coils in the first coil array 310 partially overlap with the orthogonal coil in the first coil array 310, and the two annular coils also overlap, and the two annular coils are adjacent coils, and any one of the annular coils and the orthogonal coil are adjacent coils. Figure 3

[0051] The adjacent coils in the two adjacent coil projections can be coils of different types or coils of the same type. For example, the two annular coils in the first coil array 310 partially overlap, and any one of the annular coils partially overlaps with the orthogonal coil.

[0052] The first coil array 210 can include one or more first coils, and the second coil array 220 can include one or more second coils.

[0053] In some embodiments, the two adjacent coil projections in the projections of the coils in the first coil array 210 and the coils in the second coil array 220 on the plane perpendicular to the first direction 230 can include a first coil projection and a second coil projection. In other words, the projection of any coil in the first coil array 210 and the projection of any coil in the second coil array 220 on the plane perpendicular to the first direction 230 can only partially overlap or not overlap, and cannot completely overlap, so that the coupling between the coils in the first coil array 210 and the second coil array 220 when arranged relatively close to each other can be reduced.

[0054] In some embodiments, the two adjacent coil projections in the projections of the coils in the first coil array 210 and the coils in the second coil array 220 on the plane perpendicular to the first direction 230 can include two adjacent first coil projections. In other words, any adjacent coils in the first coil array 210 can only partially overlap, and cannot completely overlap.

[0055] In some embodiments, the two adjacent coil projections in the projections of the coils in the first coil array 210 and the coils in the second coil array 220 on the plane perpendicular to the first direction 230 can include two adjacent second coil projections. In other words, any adjacent coils in the second coil array 220 can only partially overlap, and cannot completely overlap. ​

[0056] In some embodiments, two adjacent coil projections in the projections of the coils in the first coil array 210 and the coils in the second coil array 220 in the plane perpendicular to the first direction 230 can include two adjacent first coil projections, two adjacent second coil projections, and one first coil projection and one second coil projection.

[0057] In some embodiments, the projections of the first coil array 210 and the second coil array 220 in the plane perpendicular to the first direction 230 after being arranged oppositely along the first direction are not completely overlapped. The projections of the first coil array 210 and the second coil array 220 in the plane after being arranged oppositely along the first direction are not completely overlapped means that the projections of the first coil array 210 and the second coil array 220 as a whole are partially overlapped. When the projections of the centers of the first coil array 210 and the second coil array 220 in the plane are overlapped after being arranged oppositely along the first direction, the projections of the first coil array 210 and the second coil array 220 in the plane after being arranged oppositely along the first direction are not completely overlapped means that the shapes of the regions formed by the boundaries of the first coil array 210 and the second coil array 220 are different.

[0058] In the projections of the coils in the first coil array 210 and the coils in the second coil array 220 in the plane perpendicular to the first direction 230, any two adjacent coil projections are not completely overlapped, but only partially overlapped. By making the adjacent coil projections in the projections of the upper and lower coil arrays not completely overlapped, the mutual inductance between the adjacent coils in the upper and lower coil arrays when the distance between the upper and lower coil arrays is relatively close is offset. When the coils are partially overlapped, the mutual inductance between the coils can be offset by appropriate geometric design, so that the signal of one coil does not significantly affect the adjacent coil, thereby reducing the coupling between the coils and improving the signal-to-noise ratio.

[0059] In some embodiments, the projections of the first coil array 210 and the second coil array 220 in the plane perpendicular to the first direction 230 after being arranged oppositely along the first direction can be symmetrical along a first axis, and the first axis is parallel to a second direction and passes through the center 215 of the first coil array 210 or the center 225 of the second coil array 220. The second direction can be parallel to the arrangement direction of the coils in the first coil array 210 or the second coil array 220. For example, as shown in FIG. 2A, the second direction can be parallel to the X axis or the Z axis. For another example, as shown in FIG. 2B, the second direction can be parallel to the X axis or the Y axis. Figure 2A Figure 3 ​As shown, the coil arrangement direction 330 in the first coil array 310 or the second coil array 320 is perpendicular to the first direction (the first direction is perpendicular to the direction of the paper), and the projection of the first coil array 310 and the second coil array 320 on the plane perpendicular to the first direction is symmetrical along the second direction 330. By using the upper and lower coil arrays configured in this way, decoupling can be achieved, thereby improving the signal-to-noise ratio and improving the image quality.

[0060] In some embodiments, after the first coil array 210 and the second coil array 220 are arranged opposite to each other along the first direction 230, the projection of the first coil array 210 and the second coil array 220 on the plane perpendicular to the first direction 230 can be symmetrical along a second axis, the second axis being perpendicular to the second direction and perpendicular to the first direction, and passing through the center of the first coil array 210 or the second coil array 220.

[0061] In some embodiments, after the first coil array 210 and the second coil array 220 are arranged opposite to each other along the first direction 230, the projection of the first coil array 210 and the second coil array 220 on the plane perpendicular to the first direction 230 can be symmetrical along both the first axis and the second axis.

[0062] In some embodiments, the coils in the first coil array 210 are symmetrical along the first axis and / or the second axis, and the coils in the second coil array 220 are symmetrical along the first axis and / or the second axis, so that when the first coil array 210 and the second coil array 220 are arranged opposite to each other along the first direction 230, the projection of the center 215 of the first coil array 210 and the center 225 of the second coil array 220 overlaps, and the projection of the first coil array 210 and the second coil array 220 on the plane perpendicular to the first direction 230 is symmetrical along the first axis and / or the second axis.

[0063] In some embodiments, after the first coil array 210 and the second coil array 220 are arranged opposite to each other along the first direction 230, the projection of different types of coils in the first coil array 210 and the second coil array 220 on the plane perpendicular to the first direction 230 can be symmetrical along the first axis and / or the second axis. For example, Figure 3 As shown, after the first coil array 310 and the second coil array 320 are arranged opposite to each other along the first direction, the quadrature coils in the first coil array 310 and the loop coils in the second coil array 320 are symmetrical along the second direction 330, and the two overlapping loop coils in the first coil array 310 and the two overlapping quadrature coils in the second coil array 320 are symmetrical along the second direction 330.

[0064] In some embodiments, the coil configuration in the first coil array 210 and the coil configuration in the second coil array 220 are different. As described herein, the coil configuration in a coil array can include the number of coils, the type of coils, the arrangement of coils, etc. The coil configuration in the first coil array 210 and the coil configuration in the second coil array 220 being different means at least one of the number of coils, the type of coils, and the arrangement of coils is different.

[0065] In some embodiments, the type of coils in the first coil array 210 and the second coil array 220 can include at least two of, for example, at least two of a loop coil, a quadrature coil, and a spiral coil, etc. The loop coil can include a circular coil, an elliptical coil that is approximately circular, etc. The quadrature coil can include a figure-eight coil, a double loop coil, etc.

[0066] The type of coils in the first coil array 210 and the second coil array 220 can be the same, can be different.

[0067] In some embodiments, the first coil array 210 can include a quadrature coil and a loop coil; the second coil array 220 can include a quadrature coil. For example, as shown in FIG. 4, the first coil array 410 is composed of one quadrature coil and two loop coils, and the second coil array 420 is composed of two quadrature coils. Figure 4

[0068] In some embodiments, the first coil array 210 can include a quadrature coil and a loop coil; the second coil array 220 can include a quadrature coil and a loop coil. For example, as shown in FIG. 3, the first coil array 310 is composed of one quadrature coil and two loop coils, and the second coil array 320 is composed of two quadrature coils and one loop coil. For another example, as shown in FIG. 5, the first coil array 510 is composed of one quadrature coil and one loop coil, and the second coil array 520 is composed of two quadrature coils and two loop coils. Figure 3 Figure 5

[0069] In some embodiments, the first coil array 210 can include a quadrature coil; the second coil array 220 can include a loop coil. For example, the first coil array 210 is composed of one quadrature coil, and the second coil array 220 is composed of two loop coils.

[0070] In some embodiments, the first coil array 210 can include a quadrature coil; the second coil array 220 can include a loop coil and a quadrature coil. For example, as shown in FIG. 6, the first coil array 610 is composed of one quadrature coil, and the second coil array 620 is composed of one loop coil and two quadrature coils. Figure 6

[0071] ​​​​In some embodiments, the first coil array 210 may include a ring coil; the second coil array 220 may include orthogonal coils. For example, the first coil array 210 consists of a ring coil, and the second coil array 220 consists of two orthogonal coils.

[0072] In some embodiments, the first coil array 210 may include a ring coil, and the second coil array 220 may include a quadrature coil and a ring coil. For example, the first coil array 210 consists of two ring coils, and the second coil array 420 consists of one ring coil and two quadrature coils.

[0073] When the first coil array 210 and the second coil array 220 are used for magnetic resonance scanning, since they need to be positioned on opposite sides of the same scanning object, if the coil types in both arrays are the same, it is more likely that the projections of adjacent coils in the first coil array 210 and the second coil array 220 will completely overlap in the plane perpendicular to the first direction 230, resulting in enhanced coupling. By configuring the coil types in the first coil array 210 and the second coil array 220 to be different, the probability of the projections of adjacent coils in the first coil array 210 and the second coil array 220 completely overlapping in the plane perpendicular to the first direction 230 can be reduced, thus reducing coupling.

[0074] The difference in the number of coils in the first coil array 210 and the second coil array 220 includes: a difference in the number of coils of the same type in the first coil array 210 and the second coil array 220, and / or a difference in the total number of coils in the first coil array 210 and the total number of coils in the second coil array 220. For example, the first coil array 210 includes M ring coils and N orthogonal coils, or it includes P ring coils and Q orthogonal coils, where M, N, P, and Q are all integers greater than or equal to 0, then at least one of M≠P and N≠Q is true. In some embodiments, the number of coils of the same type in the first coil array 210 and the second coil array 220 can be the same or different. Preferably, the number of coils of the same type in the first coil array 210 and the second coil array 220 is different.

[0075] like Figure 3 As shown, the number of coils of the same type in the first coil array 310 and the second coil array 320 are different. The number of ring coils in the first coil array 310 is 2, while the number of ring coils in the second coil array 320 is 1; the number of orthogonal coils in the first coil array 310 is 1, while the number of orthogonal coils in the second coil array 320 is 2.

[0076] When the first coil array 210 and the second coil array 220 are used for magnetic resonance scanning, since the first coil array 210 and the second coil array 220 need to be arranged on two sides of the same scanning object, when the number of same type coils in the first coil array 210 and the second coil array 220 is the same, the projections of the same type coils in the first coil array 210 and the second coil array 220 on the plane perpendicular to the first direction 230 are more likely to completely overlap, thereby causing coupling enhancement. By making the number of same type coils in the first coil array 210 and the second coil array 220 different, when the first coil array 210 and the second coil array 220 are used for magnetic resonance scanning, since the first coil array 210 and the second coil array 220 need to be arranged on two sides of the same scanning object, adjacent coil projections in the projections of the same type coils in the first coil array 210 and the second coil array 220 on the plane perpendicular to the first direction 230 can not completely overlap.

[0077] The difference in the arrangement of the coils in the first coil array 210 and the arrangement of the coils in the second coil array 220 can include a difference in the overlap degree of adjacent two coils of the same type or different types in the first array coils and a difference in the overlap degree of adjacent two coils of the same type or different types in the second array coils. The overlap degree of adjacent two coils can be represented by the ratio of the overlap area of the adjacent two coils to the area of any one of the adjacent two coils. The greater the ratio of the overlap area of the adjacent two coils to the area of any one of the adjacent two coils, the greater the overlap degree of the adjacent two coils. When the ratio is 1, it means that the two adjacent coils completely overlap; when the ratio is 0, it means that the two adjacent coils do not completely overlap.

[0078] In some embodiments, the difference in the arrangement of the coils in the first coil array 210 and the arrangement of the coils in the second coil array 220 can include a difference in the arrangement of the same type coil arrays in the first coil array 210 and the second coil array 220, i.e., a difference in the overlap degree of adjacent two coils of the same type in the first coil array 210 and the second coil array 220. When the first coil array 210 and the second coil array 220 are used for magnetic resonance scanning, since the first coil array 210 and the second coil array 220 need to be arranged on two sides of the same scanning object, when the overlap degree of the same type coils in the first coil array 210 and the second coil array 220, it is more likely to cause the projections of the same type coils in the first coil array 210 and the second coil array 220 on the plane perpendicular to the first direction 230 to completely overlap, thereby causing coupling enhancement.

[0079] By making the degree of overlap of the same type of coils in the first coil array 210 and the second coil array 220 different, when the first coil array 210 and the second coil array 220 are used for magnetic resonance scanning, since the first coil array 210 and the second coil array 220 need to be arranged on both sides of the same scanning object, the projections of the same type of coils in the first coil array 210 and the second coil array 220 in the plane perpendicular to the first direction 230 can not completely overlap the projections of adjacent coils.

[0080] In some embodiments, the same type of coils in the first coil array 210 and the second coil array 220 can be arranged alternately. For example, as shown in FIG. 3, two loop coils in the first coil array 310 are arranged alternately, and two orthogonal coils in the second coil array 320 are arranged alternately. For another example, as shown in FIG. 4, two loop coils in the first coil array 410 are arranged alternately, and two orthogonal coils in the second coil array 420 are arranged alternately. Figure 3 Figure 4

[0081] In some embodiments, the center positions of the same type of coils in the first coil array 210 and the second coil array 220 can be different, and the center positions of the plurality of coils can be different, that is, the projections of the centers of these coils in the plane 240 perpendicular to the first direction 230 do not coincide. For example, as shown in FIG. 3, the center positions of the three loop coils in the first coil array 310 and the second coil array 320 are different, and the center positions of the three orthogonal coils are also different. For another example, as shown in FIG. 4, the center positions of the two loop coils in the first coil array 410 and the second coil array 420 are different, and the center positions of the three orthogonal coils are also different. Figure 3 Figure 4

[0082] Through the embodiments in the present specification, by designing the coil configuration (for example, type, number, and arrangement) in the first coil array 210 and the second coil array 220, so that the projections of any two adjacent coils of the first coil array 210 and the second coil array 220 do not completely overlap, but only exist a partially overlapping projection area. By making the coil projections of the upper and lower coil arrays not completely overlap, the mutual inductance between adjacent coils is offset. When the coils partially overlap, the mutual inductance between the coils can be offset by suitable geometric design, so that the signal of one coil does not significantly affect the adjacent coil, thereby reducing the coupling between the coils and improving the signal-to-noise ratio.

[0083] In some embodiments, as shown in FIG. 5, Figure 2B and Figure 2C ​​​​As shown, the magnetic resonance coil assembly 200 further comprises supports, i.e. a first support 250 and a second support 260. The first coil array 210 can be arranged on a surface of the first support 250, and the second coil array 220 can be arranged on a surface of the second support 260. For example, the first coil array 210 can be arranged on an outer surface or an inner surface of the first support 250.

[0084] In some embodiments, the shape of the first coil array 210 can be adapted to the shape of the first support 250, and the shape of the second coil array 220 can be adapted to the shape of the second support 260. For example, as shown in FIG. 2A, the outer surface of the first support 250 is arc-shaped, and the first coil array 210 is attached to the outer surface of the first support 250, thus the shape of the first coil array 210 is arc-shaped. Figure 2B and Figure 2C As shown, the outer surface of the first support 250 is arc-shaped, and the first coil array 210 is attached to the outer surface of the first support 250, thus the shape of the first coil array 210 is arc-shaped.

[0085] Figure 3 is a schematic diagram of an exemplary magnetic resonance coil assembly according to some embodiments of the present specification. As shown in Figure 3 The magnetic resonance coil assembly 300 comprises a first coil array 310 and a second coil array 320. It should be noted that the number of coils in the magnetic resonance coil assembly 300 is for illustration only, and the actual number of coils can be increased according to requirements, for example, the number of figure-eight coils and the number of loop coils can be increased along the second direction 330.

[0086] The first coil array 310 comprises two loop coils and one orthogonal coil, the two loop coils are elliptical coils, and the orthogonal coil is a figure-eight coil. The two loop coils are symmetrically distributed on both sides of the orthogonal coil, and two of the three coils overlap, and the three coils have an overlapping region in the central part.

[0087] The second coil array 320 comprises two orthogonal coils and one loop coil. The two orthogonal coils are figure-eight coils, and the loop coil is an elliptical coil. The two orthogonal coils are symmetrically distributed on both sides of the loop coil, and two of the three coils overlap, and the three coils have an overlapping region in the central part.

[0088] The orthogonal coils in the first coil array 310 and the loop coils in the second coil array 320 are symmetrical along the second direction 330, the two overlapping loop coils in the first coil array 310 and the two overlapping orthogonal coils in the second coil array 320 are symmetrical along the second direction 330, so that complete decoupling is achieved, the signal-to-noise ratio is greatly improved, and the image quality is improved; the projections of the coils in the first coil array 310 and the coils in the second coil array 320 on the plane where the first coil array 310 or the second coil array 320 is located are not completely overlapped, the mutual inductance between adjacent coils is offset, so that the signal of one coil does not significantly affect adjacent coils, thereby reducing the coupling between the coils and improving the signal-to-noise ratio.

[0089] Figure 4 is a schematic diagram of an exemplary magnetic resonance coil assembly according to some embodiments of the present specification. As shown, the magnetic resonance coil assembly 400 includes a first coil array 410 and a second coil array 420. Figure 4

[0090] The first coil array 410 has the same configuration as the first coil array 310, and will not be described here.

[0091] The second coil array 420 reduces one loop coil on the basis of the second coil array 320 and includes two orthogonal coils, both of which are 8-shaped coils. The two orthogonal coils have an overlapping region in the central part.

[0092] The two overlapping loop coils in the first coil array 410 and the two overlapping orthogonal coils in the second coil array 420 are symmetrical along the second direction 430, which better removes the coupling and thereby improves the signal-to-noise ratio and improves the image quality; the projections of the coils in the first coil array 410 and the coils in the second coil array 420 on the plane where the first coil array 410 or the second coil array 420 is located are not completely overlapped, the mutual inductance between adjacent coils is offset, so that the signal of one coil does not significantly affect adjacent coils, thereby reducing the coupling between the coils and improving the signal-to-noise ratio.

[0093] Figure 5 is a schematic diagram of an exemplary magnetic resonance coil assembly according to some embodiments of the present specification. As shown, the magnetic resonance coil assembly 500 includes a first coil array 510 and a second coil array 520. Figure 5

[0094] The first coil array 510 reduces one loop coil on the basis of the first coil array 310 and includes one orthogonal coil and one loop coil, the orthogonal coil is an 8-shaped coil, and the loop coil is a circular coil. The orthogonal coil and the loop coil have an overlapping region in the central part.

[0095] ​​The second coil array 520 adds one toroidal coil on the basis of the second coil array 320, and includes two orthogonal coils and two toroidal coils, both of the two orthogonal coils are 8-shaped coils, and both of the two toroidal coils are circular coils. The two orthogonal coils are symmetrically distributed on both sides of the toroidal coil, the two toroidal coils are symmetrically distributed on both sides of the orthogonal coil, and two of the four coils overlap, and the four coils have an overlapping area in a central part.

[0096] The toroidal coil and the orthogonal coil in the first coil array 510 are symmetric along the second direction 530 with the two overlapping orthogonal coils and the two overlapping toroidal coils in the second coil array 520, which better removes the coupling, thereby improving the signal-to-noise ratio and improving the image quality; the projection of the coils in the first coil array 510 and the coils in the second coil array 520 on the plane where the first coil array 510 or the second coil array 520 is located does not completely overlap, which offsets the mutual inductance between adjacent coils, so that the signal of one coil does not significantly affect adjacent coils, thereby reducing the coupling between the coils and improving the signal-to-noise ratio.

[0097] Figure 6 is a schematic diagram of an exemplary magnetic resonance coil assembly according to some embodiments of the present specification. As shown in Figure 6 the magnetic resonance coil assembly 600 includes a first coil array 610 and a second coil array 620.

[0098] The first coil array 610 reduces one toroidal coil on the basis of the first coil array 510, and includes one orthogonal coil, which is an 8-shaped coil.

[0099] The second coil array 620 reduces one toroidal coil on the basis of the second coil array 520, and includes two orthogonal coils and one toroidal coil, both of the two orthogonal coils are 8-shaped coils, and the toroidal coil is a circular coil. The two orthogonal coils are symmetrically distributed on both sides of the toroidal coil, and two of the three coils overlap, and the three coils have an overlapping area in a central part.

[0100] The toroidal coil in the first coil array 610 and the two overlapping orthogonal coils and the two overlapping toroidal coils in the second coil array 620 are symmetric along the second direction 630, which better removes the coupling, thereby improving the signal-to-noise ratio and improving the image quality; the projection of the coils in the first coil array 610 and the coils in the second coil array 620 on the plane where the first coil array 610 or the second coil array 620 is located does not completely overlap, which offsets the mutual inductance between adjacent coils, so that the signal of one coil does not significantly affect adjacent coils, thereby reducing the coupling between the coils and improving the signal-to-noise ratio.

[0101] In some embodiments, the first coil array 210 and the second coil array 220 can be other configurations. For example, one of the two arrays includes one loop coil, and the other includes two loop coils and one quadrature coil. For another example, one of the arrays includes four or more coils, etc. By the combination and arrangement of various types and numbers of coils, different requirements can be well met, and a balance between reducing complexity and good decoupling effect can be achieved.

[0102] The foregoing detailed description has set forth various embodiments of the application via the use of specific terminology. As such, the description herein is not intended to limit the application, but rather, the description is intended to serve as a description of the various embodiments of the application. It is contemplated that the detailed description set forth herein is not the only way to implement the application. Accordingly, the detailed description set forth herein is not intended as limiting, but rather as a description of the various embodiments of the application.

[0103] Finally, it should be understood that the examples described herein are intended to be examples only. Changes can be made in the function and arrangement of elements without departing from the spirit of the application. As such, various modifications can be made to the implementation without departing from the scope of the disclosure including the spirit of the disclosure and the scope of the appended claims. Accordingly, although specific adaptations can have been described with respect to one or more implementations, it is contemplated that numerous modifications, adaptations and alterations can be made within the scope and spirit of the disclosure, and that such modifications, adaptations, and alterations are intended to be within the scope of the claims.

Claims

1. A magnetic resonance coil assembly, characterized in that, Includes a first coil array and a second coil array; When the first coil array and the second coil array are configured to be positioned opposite each other along a first direction for detecting magnetic resonance signals, the projections of two adjacent coils in the first coil array and the second coil array onto a plane perpendicular to the first direction do not completely overlap.

2. The magnetic resonance coil assembly as claimed in claim 1, characterized in that, The projections of the first coil array and the second coil array onto the plane perpendicular to the first direction are symmetrical along a first axis and / or a second axis. The first axis is parallel to the second direction, the second axis is perpendicular to the second direction, and the second direction is parallel to the coil arrangement direction in the first coil array or the second coil array.

3. The magnetic resonance coil assembly as described in claim 1, characterized in that, The projections of the center of the first coil array and the center of the second coil array onto a plane perpendicular to the first direction coincide.

4. The magnetic resonance coil assembly as claimed in claim 1, characterized in that, The coil types in the first coil array and the second coil array include at least two types, and the at least two types of coils include toroidal coils and quadrature coils.

5. The magnetic resonance coil assembly as claimed in claim 4, characterized in that, The first coil array includes two loop coils and one orthogonal coil. The second coil array includes a loop coil and two orthogonal coils, or The second coil array includes two orthogonal coils.

6. The magnetic resonance coil assembly as claimed in claim 1, characterized in that, The number of coils of the same type differs in the first coil array and the second coil array.

7. The magnetic resonance coil assembly as claimed in claim 1, characterized in that, The coils of the same type in the first coil array and the second coil array are arranged alternately.

8. The magnetic resonance coil assembly as claimed in claim 1, characterized in that, The center positions of the same type of coils in the first coil array and the second coil array are different.

9. The magnetic resonance coil assembly as claimed in claim 1, characterized in that, It also includes a first support member and a second support member, wherein the first coil array is arranged on the surface of the first support member and the second coil array is arranged on the surface of the second support member.

10. A magnetic resonance device, characterized in that, The device includes a magnetic resonance coil assembly as described in any one of claims 1-9.

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