An adaptive wearable metasurface device for magnetic resonance imaging

Abstract

The application provides an adaptive wearable metasurface device for magnetic resonance signal imaging, comprising: a plurality of metamaterial units with arc-shaped hollow structures, the plurality of metamaterial units being spliced together to form the adaptive wearable metasurface device with a cylindrical structure; and at least one structural capacitor arranged on the arc-shaped hollow structure; the structural capacitor comprises two wires with comb-shaped structures, and the comb-shaped structures of the two wires are engaged with each other; wherein the comb-shaped structure is formed by bending the wire and has stretchability. The adaptive wearable metasurface device for magnetic resonance signal imaging has the beneficial effects of high comfort, strong signal-to-noise ratio enhancement performance and good versatility.

Description

Technical Field

[0001] The present application relates to the technical field of magnetic resonance imaging, and in particular to an adaptive wearable metasurface device for magnetic resonance imaging. Background Art

[0002] Magnetic resonance imaging (MRI) is a high-end diagnostic imaging technology in modern medicine. Its image quality is primarily determined by the signal-to-noise ratio (SNR). A high SNR can produce clearer images, providing higher-quality clinical diagnostics, and can also be used to shorten scan times and improve detection efficiency. Traditionally, improving SNR has been achieved by increasing the static magnetic field strength, B0, or by employing multi-channel phased array linear receiving coils. However, increasing the static magnetic field strength significantly increases costs. Multi-channel phased array coils have also encountered bottlenecks. Increasing the number of channels leads to increased costs, excessive volume and weight, and complex decoupling.

[0003] Although wearable metasurfaces have a higher theoretical image signal-to-noise ratio, due to the non-fixed configuration of the flexible wearable design metasurface, the wearable metasurface may be in different stretching states when worn on different human bodies, which will cause the resonant frequency of the metasurface to shift. When the resonant frequency of the metasurface shifts from the operating frequency of the MRI system, the signal-to-noise ratio improvement performance will drop rapidly. Summary of the Invention

[0004] The present invention provides an adaptive wearable metasurface device for magnetic resonance imaging to solve the problem that when the wearable metasurface is stretched and deformed, the resonant frequency shifts, thereby causing a decrease in the magnetic resonance signal-to-noise ratio enhancement performance.

[0005] In order to solve at least one of the above-mentioned problems existing in the prior art, an embodiment of the present application provides an adaptive wearable metasurface device for magnetic resonance imaging.

[0006] According to an embodiment of the present application, the present application provides an adaptive wearable metasurface device for magnetic resonance imaging, comprising:

[0007] Multiple metamaterial units with arc-shaped hollow structures are spliced ​​together to form an adaptive wearable metasurface device with a cylindrical structure;

[0008] At least one structural capacitor is arranged on the arc-shaped hollow structure; the structural capacitor includes two conductors with comb-tooth structures, and the comb-tooth structures of the two conductors are meshed with each other; wherein the comb-tooth structure is formed by bending the conductors and has elasticity.

[0009] In some embodiments of the present application, an adaptive wearable metasurface device for magnetic resonance imaging further includes:

[0010] At least one adjustable capacitor is provided on the arc-shaped hollow structure, and is used to match the resonant frequency of the metamaterial unit in an unstretched state with the operating frequency of the nuclear magnetic resonance system.

[0011] In some embodiments of the present application, the shape of the arc-shaped hollow structure mapped on a plane is a rectangle, and the structural capacitor is arranged on the curved side of the rectangle.

[0012] In some embodiments of the present application,

[0013] The structural capacitor is arranged on one of the two sides of the rectangle where the rectangle is bent, and the adjustable capacitor is arranged on the other of the two sides of the rectangle where the rectangle is bent.

[0014] In some embodiments of the present application, adjacent metamaterial units partially overlap.

[0015] In some embodiments of the present application, the number of the metamaterial units is an even number.

[0016] In some embodiments of the present application, the material of the wire is one or more of liquid metal, wire silver paste and mercury.

[0017] In some embodiments of the present application, the number of the structural capacitor is 1; the number of the adjustable capacitor is 1.

[0018] In some embodiments of the present application, adjacent metamaterial units are connected via the arc-shaped hollow structure.

[0019] In some embodiments of the present application, an adaptive wearable metasurface device for magnetic resonance imaging further includes:

[0020] A substrate, used to support the metamaterial unit, and made of a stretchable material without nuclear magnetic signal;

[0021] The packaging surface is used to package the adaptive wearable metasurface device, and the material is one or more of stretchable fabric and rubber.

[0022] From the above description, it can be seen that an embodiment of the present invention provides an adaptive wearable metasurface device for magnetic resonance imaging, including: a plurality of metamaterial units having an arc-shaped hollow structure, the plurality of metamaterial units being spliced ​​together to form an adaptive wearable metasurface device having a cylindrical structure; at least one structural capacitor, arranged on the arc-shaped hollow structure; the structural capacitor includes two wires having a comb-tooth structure, and the comb-tooth structures of the two wires are meshed with each other; wherein the comb-tooth structure is formed by bending the wire and has elasticity.

[0023] The adaptive wearable metasurface device for magnetic resonance imaging proposed in the embodiment of the present invention perfectly solves the problem of frequency shift caused by strain on the wearable metasurface, and helps to improve the signal-to-noise ratio of magnetic resonance imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0025] Figure 1 Schematic diagram of the overall structure of an adaptive wearable metasurface device for magnetic resonance imaging according to an embodiment of the present application.

[0026] Figure 2 Schematic diagram of the structure of the metamaterial unit of an embodiment of the present application.

[0027] Figure 3 A schematic diagram of the structure of a structural capacitor according to an embodiment of the present application.

[0028] Figure 4 Schematic diagram of the metasurface resonant frequency compensation principle of the adaptive wearable metasurface device for magnetic resonance imaging according to an embodiment of the present application.

[0029] Figure 5 This is another structural schematic diagram of the structural capacitor according to an embodiment of the present application.

[0030] Figure 6 Schematic diagram of the application scenario of the adaptive wearable metasurface device for magnetic resonance imaging, which is a specific application example of this application.

[0031] Figure 7 A schematic diagram comparing the initial state and the stretched state of a metamaterial unit in a specific application example of this application;

[0032] Figure 8This is a schematic structural diagram of the substrate and packaging surface of an adaptive wearable metasurface device for magnetic resonance imaging, which is a specific application example of this application.

[0033] Reference numerals:

[0034] 1: Metamaterial unit;

[0035] 2: Arc-shaped hollow structure;

[0036] 3: Structural capacitance;

[0037] 4: wire;

[0038] 5: adjustable capacitor;

[0039] 6: Mobile bed;

[0040] 7: RF transmitting coil (body coil);

[0041] 8: gradient coil;

[0042] 9: Main magnet coil;

[0043] 10: Adaptive wearable metasurface devices for magnetic resonance imaging;

[0044] 11: base;

[0045] 12: Packaging surface. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices. The embodiments in this application and the features described in the embodiments may be combined with each other unless there is a conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0048] Metasurface provides a new way for further enhancement of SNR of MRI. Metasurface resonates at the working frequency of MRI, greatly enhances the RF magnetic field in the region of interest, amplifies the nuclear magnetic resonance signal, and further enhances the SNR of the magnetic resonance image. The metasurface with a fixed configuration has been verified to be feasible in improving the SNR of MRI. Wearable metasurface can be as close as possible to the surface of the measured target, adapt to the irregular structure of human body parts, and theoretically further improve the SNR compared with the metasurface with a fixed configuration.

[0049] The following two methods are used to solve the above technical problems in the prior art:

[0050] Firstly, a multi-channel phased array magnetic resonance RF receiving coil receives MR signals through multiple single-loop RF coils, each coil covering a different anatomical region. These coils can work at different phases to simultaneously collect nuclear magnetic signals, and then combine the data of each channel to generate a magnetic resonance image. This method needs to be connected to the magnetic resonance system through a cable. The multi-channel phased array coil technology has encountered bottlenecks. The increase in the number of channels will bring about problems such as cost increase, size and weight exceeding the limit, decoupling complexity, etc. Moreover, as the number of channels increases, the SNR is basically no longer enhanced.

[0051] Secondly, a metasurface with a fixed configuration is used. A metal wire array is used to form a metasurface, which can resonate at the working frequency of MRI, amplify the RF magnetic field in the region, and enhance the image SNR. However, due to the fixed configuration, it cannot be attached to the surface of the measured target, so it cannot maximize the image SNR, and the SNR enhancement performance of the metasurface cannot be fully utilized. The flexible attachment characteristics of wearable metasurface can maximize the image SNR.

[0052] In order to solve at least one of the above problems in the prior art, the embodiments of the present application provide a self-adaptive wearable metasurface device for magnetic resonance signal imaging. Figure 1 A schematic diagram of the self-adaptive wearable metasurface device for magnetic resonance signal imaging according to an embodiment of the present application is shown in FIG. 1. As shown in FIG. 1, the self-adaptive wearable metasurface device for magnetic resonance signal imaging comprises: Figure 1

[0053] A plurality of metamaterial units 1 with an arc-shaped hollow structure 2 (the meaning of the arc-shaped hollow structure is that the metamaterial unit 1 is an arc as a whole, and the middle part of the arc is cut out and only has a side part), as shown in FIG. 2. Figure 2 (In Figure 2 ​In the embodiment, the arc-shaped hollow structure 2 of the metamaterial unit 1 is mapped to a rectangle on the plane. In addition, the arc-shaped hollow structure of the metamaterial unit 1 can also be mapped to a circle or an ellipse on the plane, and the present application is not limited thereto). Multiple metamaterial units 1 are spliced ​​together to form an adaptive wearable metasurface device with a cylindrical structure (see Figure 1 ); wherein, the side surface of the cylindrical structure is composed of a plurality of arc-shaped hollow structures 2; wherein, the arc-shaped hollow structure 2 is mapped on the plane as a closed ring (it should be noted that the ring is not necessarily a circular ring, it can also be other shapes, for example, a circle or an ellipse, or other irregular shapes).

[0054] At least one structural capacitor 3 is provided on the arc-shaped hollow structure 2; see Figure 3 The structural capacitor 3 includes two conductors 4 with a comb-tooth structure, and the comb-tooth structures of the two conductors 4 are meshed with each other; wherein the comb-tooth structure is formed by bending the conductors and has elasticity.

[0055] In the structural capacitor 3, the "teeth" of the comb-tooth structure of one of the conductors 4 are inserted into the "comb" structure of another conductor 4, and the material of the conductor 4 is one or more of liquid metal, conductor silver paste and mercury.

[0056] Specifically, see Figure 3 Structural capacitor 3 is formed by the meshing of two comb-like conductive structures, one above the other. Its equivalent capacitance is determined by the comb-tooth structure's facing length L, comb-tooth width a, comb-tooth gap b, and thickness t. Its equivalent capacitance can be calculated using finite element methods. Generally speaking, the equivalent capacitance increases with L, t, and the number of comb teeth, and decreases with b. During stretching, a and b increase due to strain, while the equivalent capacitance decreases, thereby compensating for the resonant frequency.

[0057] It is understandable that due to the size differences of the measured targets, when the wearable metasurface is worn on different measured target surfaces, its configuration size will change, its equivalent inductance will change, and thus the resonant frequency will shift. Figure 4 As shown in Figure 2, when a metasurface is worn on a larger target surface, its size will be stretched, resulting in a larger equivalent inductance. According to the formula for calculating the resonant frequency of the metasurface:

[0058]

[0059] Where: L is the inductance of the wearable metasurface, C is the capacitance of the wearable metasurface, and ω is the resonant frequency of the wearable metasurface.

[0060] When the equivalent inductance decreases, the resonant frequency of the metasurface will decrease, resulting in a decrease in the RF magnetic co-enhancement performance of the metasurface at the magnetic resonance resonance point.

[0061] In order to solve this problem, an embodiment of the present application provides an adaptive wearable metasurface device for magnetic resonance imaging with the above-mentioned configuration, in which the structural capacitance of the adaptive wearable metasurface device changes with the change of strain. When the size of the metasurface in the adaptive wearable metasurface device increases, the size of the metamaterial unit will also increase, and the spacing between the comb-tooth structures on the structural capacitor will increase under the action of strain, thereby causing the capacitance value of the structural capacitor to decrease. According to the aforementioned formula for calculating the resonant frequency of the metasurface, the resonant frequency of the metasurface will increase at this time, thereby correcting the decrease in resonant frequency due to the increase in equivalent inductance. Ideally, when the product of the equivalent inductance and the equivalent capacitance (L×C) remains constant, the resonant frequency of the metasurface will remain unchanged.

[0062] From the above description, it can be seen that an embodiment of the present invention provides an adaptive wearable metasurface device for magnetic resonance imaging, including: a plurality of metamaterial units having an arc-shaped hollow structure, the plurality of metamaterial units being spliced ​​together to form an adaptive wearable metasurface device having a cylindrical structure; at least one structural capacitor, arranged on the arc-shaped hollow structure; the structural capacitor includes two wires having a comb-tooth structure, and the comb-tooth structures of the two wires are meshed with each other; wherein the comb-tooth structure is formed by bending the wire and has elasticity.

[0063] An embodiment of the present invention provides an adaptive wearable metasurface device for magnetic resonance imaging, which has the technical advantages of high comfort, strong signal-to-noise ratio enhancement performance, and good versatility.

[0064] In some embodiments of this application, see Figure 5 , an adaptive wearable metasurface device for magnetic resonance imaging, further comprising:

[0065] At least one adjustable capacitor 5 is provided on the annular arc-shaped hollow structure 2 and is used to match the resonant frequency of the metamaterial unit 1 in an unstretched state with the operating frequency of the nuclear magnetic resonance system.

[0066] The resonant frequency (also known as the Larmor frequency) is the frequency at which nuclear spins precess in an external magnetic field. This frequency depends on the strength of the external magnetic field and the magnetic gyrometry of the nucleus.

[0067] The formula for Larmor frequency is:

[0068] f=γB0 / 2π

[0069] Where: f is the Larmor frequency (resonance frequency). γ is the gyromagnetic ratio of the nucleus, which is approximately 42.58 MHz / Tesla for a hydrogen nucleus (proton). B0 is the strength of the external magnetic field (in Tesla).

[0070] It can be understood that when the target under test does not need to stretch the adaptive wearable metasurface device, the adjustable capacitor comes into play, that is, the above-mentioned adjustable capacitor 5 is configured when the adaptive wearable metasurface device does not need to be stretched.

[0071] Preferably, see Figure 2 The shape of the arc-shaped hollow structure 2 of the metamaterial unit 1 mapped on the plane is a rectangle, and the structural capacitor 3 is arranged on the curved side of the rectangle.

[0072] Further, see Figure 2 The structural capacitor 3 is arranged on one of the two sides of the rectangle where the rectangle is bent, and the adjustable capacitor is arranged on the other side of the two sides of the rectangle where the rectangle is bent (ie, the side opposite to the side where the structural capacitor 3 is located).

[0073] In some embodiments of the present application, adjacent metamaterial units partially overlap, and the area ratio of the overlapping portion to the non-overlapping portion is 9 to 1.

[0074] In some embodiments of the present application, the number of the metamaterial units is an even number.

[0075] In some embodiments of the present application, the material of the wire is one or more of liquid metal, wire silver paste and mercury.

[0076] In some embodiments of the present application, the number of the structural capacitor is 1; the number of the adjustable capacitor is 1.

[0077] In some embodiments of the present application, adjacent metamaterial units are connected by the shape of a rectangle mapped on the plane (ie, a ring-in-ring connection).

[0078] In some embodiments of the present application, an adaptive wearable metasurface device for magnetic resonance imaging further includes:

[0079] A substrate, used to support the metamaterial unit, and made of a stretchable material without nuclear magnetic signal;

[0080] The packaging surface is used to package the adaptive wearable metasurface device, and the material is one or more of stretchable fabric and rubber.

[0081] From the above description, it can be seen that an embodiment of the present invention provides an adaptive wearable metasurface device for magnetic resonance imaging, including: a plurality of metamaterial units having an arc-shaped hollow structure, the plurality of metamaterial units being spliced ​​together to form an adaptive wearable metasurface device having a cylindrical structure; at least one structural capacitor, arranged on the arc-shaped hollow structure; the structural capacitor includes two wires having a comb-tooth structure, and the comb-tooth structures of the two wires are meshed with each other; wherein the comb-tooth structure is formed by bending the wire and has elasticity.

[0082] An embodiment of the present invention provides an adaptive wearable metasurface device for magnetic resonance imaging (MRI). The purpose is to solve the problem that when the wearable metasurface undergoes tensile deformation, the resonant frequency shifts, resulting in a decrease in the magnetic resonance signal-to-noise ratio enhancement performance, thereby achieving efficient signal transmission and enhancement in magnetic resonance imaging (MRI).

[0083] In order to further illustrate the solution, the present invention takes the specific application scenario of the adaptive wearable metasurface device for magnetic resonance imaging as an example, and provides a specific application example of an adaptive wearable metasurface device for magnetic resonance imaging.

[0084] This invention relates to the field of magnetic resonance imaging (MRI), specifically to the design of a frequency-adaptive, flexible, wearable metasurface and device based on strain-responsive impedance compensation for efficient signal transmission and enhancement in magnetic resonance imaging (MRI). This invention primarily addresses the problem of wearable metasurfaces experiencing a shift in resonant frequency when stretched, which can lead to a decrease in MRI signal-to-noise ratio enhancement.

[0085] First, see Figure 6 , the position shown in FIG10 is the location of the adaptive wearable metasurface device for magnetic resonance imaging, which surrounds the target and fits as closely as possible to the surface of the target (it is only necessary to wear the wearable metasurface device on the part to be measured (wrist, knee, etc.) and use a suitable receiving coil (including but not limited to spinal coil, body coil, abdominal coil, etc.)). Figure 6 In the figure, 6 is a mobile bed (which can move the human body to the optimal position according to the detection requirements), 7 is a radio frequency transmitting coil (body coil), 8 is a gradient coil, and 9 is a main magnet coil.

[0086] As mentioned above, the present application adds a strain-responsive structural capacitor to the metamaterial unit (end ring) of the metasurface of the adaptive wearable metasurface device. The structural capacitor is composed of a comb-teeth meshing type, and its capacitance changes with the change of strain. After the structural capacitor is introduced into the metasurface, when the size of the metasurface increases, the size of the end ring will also increase, and the spacing between the comb teeth on the structural capacitor will increase under the action of strain, thereby causing the structural capacitance to decrease. According to the aforementioned resonant frequency calculation formula of the metasurface, the resonant frequency of the metasurface will increase at this time, thereby correcting the decrease in resonant frequency due to the increase in equivalent inductance.

[0087] On the other hand, see Figure 1 The overall adaptive wearable metasurface device is composed of multiple metamaterial units arranged along a circumferential direction. In addition to the structural capacitance, a tunable capacitor is added to the metamaterial unit to adjust the resonant frequency of each ring to match the operating frequency of the magnetic resonance system. The rings overlap with each other to form a resonant metasurface.

[0088] The changes of a single ring of the metasurface under tensile strain are shown in the following figure: Figure 7 As shown in the figure, after stretching, the size of a single metamaterial unit (single ring) increases, and the equivalent inductance will increase. Without impedance compensation, the resonant frequency will decrease. After adding a strain-responsive structural capacitor, the tensile strain will cause the spacing between the structural capacitor teeth to increase, reducing the capacitance, thereby achieving impedance compensation and correcting the resonant frequency to the operating frequency of the magnetic resonance system.

[0089] Next, see Figure 8 The metasurface's substrate 11 is made of stretchable TPU or other stretchable, non-MRI-signaling materials, while the conductive traces are made of stretchable conductive materials such as liquid metal, conductive silver paste, or mercury. These materials are manufactured through transfer, printing, or spraying. Finally, the metasurface is encapsulated within an encapsulation surface 12 made of a stretchable material such as fabric or rubber.

[0090] As can be seen from the above description, an embodiment of the present invention provides an adaptive wearable metasurface device for magnetic resonance imaging, comprising: a plurality of metamaterial units having an arc-shaped hollow structure, the plurality of metamaterial units being spliced ​​together to form an adaptive wearable metasurface device having a cylindrical structure; at least one structural capacitor disposed on the arc-shaped hollow structure; the structural capacitor comprising two conductors having a comb-tooth structure, the comb-tooth structures of the two conductors being meshed with each other; wherein the comb-tooth structure is formed by bending the conductors and is stretchable. A specific application example of the present invention provides an adaptive wearable metasurface device for magnetic resonance imaging, the purpose of which is to solve the problem that when a wearable metasurface undergoes tensile deformation, the resonant frequency shifts, resulting in a decrease in the magnetic resonance signal-to-noise ratio enhancement performance, thereby achieving efficient signal transmission and enhancement in magnetic resonance imaging (MRI).

[0091] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0092] The descriptions with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples. The order of steps involved in each embodiment is used to schematically illustrate the implementation of the present invention, and the order of steps therein is not limited and can be appropriately adjusted as needed.

[0093] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0094] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between the various embodiments can be referenced across them. Each embodiment focuses on the differences from the other embodiments. In particular, since the system embodiments are generally similar to the method embodiments, their description is relatively simple. For relevant parts, reference can be made to the description of the method embodiments. Throughout this specification, reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the embodiments in this specification. In this specification, the schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and integrate the different embodiments or examples, and features of different embodiments or examples, described in this specification, without conflict.

[0095] The above description is merely an example of the embodiments of this specification and is not intended to limit the embodiments of this specification. For those skilled in the art, various modifications and variations of the embodiments of this specification are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of this specification shall be included within the scope of the claims of the embodiments of this specification.

Claims

1. An adaptive wearable metasurface device for magnetic resonance imaging, characterized in that: include: Multiple metamaterial units with arc-shaped hollow structures are spliced ​​together to form an adaptive wearable metasurface device with a cylindrical structure; At least one structural capacitor is arranged on the arc-shaped hollow structure; the structural capacitor includes two conductors with comb-tooth structures, and the comb-tooth structures of the two conductors are meshed with each other; wherein the comb-tooth structure is formed by bending the conductors and has elasticity.

2. The adaptive wearable metasurface device according to claim 1, characterized in that: Also includes: At least one adjustable capacitor is provided on the arc-shaped hollow structure, and is used to match the resonant frequency of the metamaterial unit in an unstretched state with the operating frequency of the nuclear magnetic resonance system.

3. The adaptive wearable metasurface device according to claim 2, characterized in that: The shape of the arc-shaped hollow structure mapped on a plane is a rectangle, and the structural capacitor is arranged on the curved side of the rectangle.

4. The adaptive wearable metasurface device according to claim 3, characterized in that: The structural capacitor is arranged on one of the two sides of the rectangle where the rectangle is bent, and the adjustable capacitor is arranged on the other of the two sides of the rectangle where the rectangle is bent.

5. The adaptive wearable metasurface device according to any one of claims 1 to 4, characterized in that: There is partial overlap between adjacent metamaterial units.

6. The adaptive wearable metasurface device according to claim 1, characterized in that: The number of the metamaterial units is an even number.

7. The adaptive wearable metasurface device according to claim 1, characterized in that: The material of the wire is one or more of liquid metal, wire silver paste and mercury.

8. The adaptive wearable metasurface device according to claim 4, characterized in that: The number of the structural capacitor is 1; the number of the adjustable capacitor is 1.

9. The adaptive wearable metasurface device according to claim 1, characterized in that: Adjacent metamaterial units are connected via the arc-shaped hollow structure.

10. The adaptive wearable metasurface device according to claim 1, characterized in that: Also includes: A substrate, used to support the metamaterial unit, and made of a stretchable material without nuclear magnetic signal; The packaging surface is used to package the adaptive wearable metasurface device, and the material is one or more of stretchable fabric and rubber.

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