Magnetic resonance radio frequency magnetic field enhancement device of high dielectric ceramic metal composite periodic array

Abstract

The invention discloses a magnetic resonance radio frequency magnetic field enhancement device of a high dielectric ceramic metal composite periodic array, which comprises a plurality of composite resonance units, the plurality of composite resonance units are arranged in an array according to a preset period, and each composite resonance unit comprises a first metal sheet, a second metal sheet and a dielectric ceramic layer, the first metal sheet and the second metal sheet are arranged at an interval along the thickness direction, and the dielectric ceramic layer is located between the first metal sheet and the second metal sheet to enable the first metal sheet and the second metal sheet to form capacitive coupling. The multiple composite resonance units are configured to be suitable for generating passive resonance at the Larmor frequency of the magnetic resonance system. According to the magnetic resonance radio frequency magnetic field enhancement device of the high dielectric ceramic metal composite periodic array, passive magnetic field enhancement can be achieved, and the magnetic resonance radio frequency magnetic field enhancement device has the advantages of being simple in structure, low in cost, good in compatibility, easy to adjust parameters, easy to machine, good in enhancement effect and the like.

Description

Technical Field

[0001] This invention relates to the field of magnetic resonance imaging radio frequency enhancement technology, and more specifically, to a magnetic resonance radio frequency magnetic field enhancement device using a high-dielectric ceramic-metal composite periodic array. Background Technology

[0002] Magnetic resonance imaging relies on radio frequency coils to generate a receiving radio frequency magnetic field (B1 field). In clinical and research imaging, the intensity and uniformity of the B1 field in the target area are often limited due to factors such as coil structure, sample load dielectric effect, radio frequency loss, and fluctuation effects under high field conditions, resulting in insufficient imaging signal-to-noise ratio, limited resolution, or prolonged scan time.

[0003] In related technologies, magnetic resonance imaging equipment can improve the B1 field or signal-to-noise ratio by improving the coil structure, using dielectric pads, and employing electromagnetic metamaterials / metasurface enhancement devices. However, coil modification is costly and has strict requirements for system compatibility. Dielectric pads have limited enhancement capabilities and are heavy. Metamaterial devices have complex structures, parameters that are difficult to match precisely, or are sensitive to load, affecting the stability of engineering applications. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a magnetic resonance radio frequency magnetic field enhancement device for a high-dielectric ceramic-metal composite periodic array. This device can achieve passive magnetic field enhancement and has the advantages of simple structure, low cost, good compatibility, easy parameter adjustment, easy processing, and good enhancement effect.

[0005] To achieve the above objectives, an embodiment of the present invention provides a magnetic resonance radio frequency magnetic field enhancement device of a high-dielectric ceramic-metal composite periodic array. The magnetic resonance radio frequency magnetic field enhancement device of the high-dielectric ceramic-metal composite periodic array includes: a plurality of composite resonant units, the plurality of composite resonant units being arranged in an array at a predetermined period, each composite resonant unit including a first metal sheet, a second metal sheet and a dielectric ceramic layer, the first metal sheet and the second metal sheet being spaced apart along the thickness direction, the dielectric ceramic layer being located between the first metal sheet and the second metal sheet to enable capacitive coupling between the first metal sheet and the second metal sheet, and the plurality of composite resonant units being configured to generate passive resonance at the Larmor frequency of the magnetic resonance system.

[0006] The magnetic resonance radio frequency magnetic field enhancement device of the high dielectric ceramic-metal composite periodic array according to the present invention can realize passive magnetic field enhancement and has the advantages of simple structure, low cost, good compatibility, easy parameter adjustment, easy processing, and good enhancement effect.

[0007] In addition, the magnetic resonance radio frequency magnetic field enhancement device of the high-dielectric ceramic-metal composite periodic array according to the above embodiments of the present invention may also have the following additional technical features:

[0008] According to one embodiment of the present invention, the first metal sheet is rectangular and the second metal sheet is annular.

[0009] According to an embodiment of the present invention, the magnetic resonance radio frequency magnetic field enhancement device of the high dielectric ceramic-metal composite periodic array further includes a third metal sheet, wherein the first metal sheet, the second metal sheet and the third metal sheet are spaced apart along the thickness direction, and the dielectric ceramic layer includes a first ceramic layer and a second ceramic layer, wherein the first ceramic layer is located between the first metal sheet and the second metal sheet, and the second ceramic layer is located between the second metal sheet and the third metal sheet.

[0010] According to one embodiment of the present invention, the dielectric ceramic layer is barium strontium titanate ceramic, the relative permittivity of the dielectric ceramic layer is 300-800, the thickness of the dielectric ceramic layer is 2-6 mm, the tangent of the dielectric loss angle of the dielectric ceramic layer at the Larmor frequency of the magnetic resonance system is not greater than 0.02, and the side length of the dielectric ceramic layer of each composite resonant unit is 15-35 mm.

[0011] According to one embodiment of the present invention, the thickness of the first metal sheet and the second metal sheet is 0.05-2 mm, the side length of the first metal sheet is 10-25 mm, and the inner diameter of the second metal sheet is 4-12 mm and the outer diameter is 5-17 mm.

[0012] According to one embodiment of the present invention, the surface of the first metal sheet and / or the second metal sheet is provided with a protective layer, the protective layer being any one or more of epoxy coating, parylene coating, polyimide coating, silicone layer or polytetrafluoroethylene layer.

[0013] According to one embodiment of the present invention, a plurality of the composite resonant units are arranged in a planar array.

[0014] According to one embodiment of the present invention, the magnetic resonance radio frequency magnetic field enhancement device of the high dielectric ceramic-metal composite periodic array further includes an outer frame, which is disposed outside the plurality of composite resonant units.

[0015] According to an embodiment of the present invention, the magnetic resonance radio frequency magnetic field enhancement device of the high dielectric ceramic metal composite periodic array further includes a support substrate, the support substrate being cylindrical, and a plurality of the composite resonant units being arranged in an array along the circumference and axial direction of the support substrate, wherein the first metal sheet is located radially inside the dielectric ceramic layer and the second metal sheet is located radially outside the dielectric ceramic layer.

[0016] According to one embodiment of the present invention, the inner diameter of the array of the plurality of composite resonant units is 120-220 mm.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of a magnetic resonance radio frequency magnetic field enhancement device for a high-dielectric ceramic-metal composite periodic array according to some embodiments of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the composite resonant unit of the magnetic resonance radio frequency magnetic field enhancement device of a high dielectric ceramic-metal composite periodic array according to some embodiments of the present invention.

[0020] Figure 3 This is an exploded view of the composite resonant unit of a magnetic resonance radio frequency magnetic field enhancement device for a high-dielectric ceramic-metal composite periodic array according to some embodiments of the present invention.

[0021] Figure 4 These are comparison diagrams of the radio frequency magnetic field intensity distribution and the radio frequency magnetic field enhancement factor curve in the penetration direction of a magnetic resonance radio frequency magnetic field enhancement device for a high dielectric ceramic-metal composite periodic array according to some embodiments of the present invention.

[0022] Figure 5 This is a schematic diagram of the structure of a magnetic resonance radio frequency magnetic field enhancement device for a high-dielectric ceramic-metal composite periodic array according to other embodiments of the present invention.

[0023] Figure 6 This is an exploded view of the composite resonant unit of a magnetic resonance radio frequency magnetic field enhancement device for a high-dielectric ceramic-metal composite periodic array according to other embodiments of the present invention.

[0024] Figure 7 These are comparison diagrams of the radio frequency magnetic field intensity distribution and the radio frequency magnetic field enhancement factor curve in the penetration direction of a magnetic resonance radio frequency magnetic field enhancement device for a high dielectric ceramic-metal composite periodic array according to other embodiments of the present invention.

[0025] Reference numerals in the figures: 1. Magnetic resonance radio frequency magnetic field enhancement device for high dielectric ceramic-metal composite periodic array; 10. Composite resonant unit; 11. First metal sheet; 12. Second metal sheet; 13. Third metal sheet; 14. Dielectric ceramic layer; 141. First ceramic layer; 142. Second ceramic layer. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] The magnetic resonance radio frequency magnetic field enhancement device 1 of a high-dielectric ceramic-metal composite periodic array according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0030] like Figures 1-7 As shown, the magnetic resonance radio frequency magnetic field enhancement device 1 of the high dielectric ceramic-metal composite periodic array according to an embodiment of the present invention includes a plurality of composite resonant units 10.

[0031] Multiple composite resonant units 10 are arranged in an array at a predetermined period. Each composite resonant unit 10 includes a first metal sheet 11, a second metal sheet 12, and a dielectric ceramic layer 14. The first metal sheet 11 and the second metal sheet 12 are spaced apart along the thickness direction. The dielectric ceramic layer 14 is located between the first metal sheet 11 and the second metal sheet 12 to form capacitive coupling between the first metal sheet 11 and the second metal sheet 12. The multiple composite resonant units 10 are configured to generate passive resonance at the Larmor frequency of the magnetic resonance system.

[0032] Specifically, the multiple composite resonant units 10 are suitable for enhancing the radio frequency magnetic field strength in the region under test of the magnetic resonance system. The multiple composite resonant units 10 achieve a radio frequency magnetic field enhancement factor of more than 10 times in the near-surface region.

[0033] The magnetic resonance radio frequency magnetic field enhancement device 1 of the high dielectric ceramic-metal composite periodic array is a passive structure.

[0034] The predetermined period is the period length of the repeated arrangement when the composite resonant units 10 are arranged in an array. For example, when the composite resonant units 10 are arranged close together, the predetermined period is the side length of the dielectric ceramic layer 14 of each composite resonant unit 10.

[0035] By adjusting at least one of the predetermined period, the size of the first metal sheet 11 and the second metal sheet 12, the thickness of the dielectric ceramic layer 14, and the relative permittivity, the resonant frequency of the magnetic resonance radio frequency magnetic field enhancement device 1 of the high dielectric ceramic metal composite periodic array can be matched with the Larmor frequency of different magnetic resonance systems, such as 1.5T, 3T, 5T, or 7T magnetic resonance systems.

[0036] The composite resonant units 10 can be arranged along a plane to form M rows and N columns, or they can be arranged along a cylindrical surface to form M ring groups arranged along the axial direction of the cylindrical surface, and each ring group includes N composite resonant units 10 arranged circumferentially along the cylindrical surface. N is 10-30 and M is 2-20.

[0037] The high-dielectric ceramic-metal composite periodic array magnetic resonance radio frequency magnetic field enhancement device 1 can be passively placed between the radio frequency transmitting coil and the object under test, between the radio frequency receiving coil and the object under test, or attached to the surface of the object under test, to obtain an enhanced radio frequency magnetic field distribution in the penetration direction and improve the imaging signal-to-noise ratio, without changing the hardware architecture of the magnetic resonance system.

[0038] The first metal sheet 11 and the second metal sheet 12 and the dielectric ceramic layer 14 can be fixed and patterned by any one or more of the following methods: co-sintering, hot pressing lamination, inorganic binder sintering, copper foil lamination and etching, sputtering deposition, chemical plating or electroplating, so as to facilitate mass production. Multiple composite resonant units 10 can be encapsulated to achieve insulation, moisture protection and biocompatibility.

[0039] Multiple composite resonant units 10 can be connected by snap-fit, adhesive or threaded fasteners.

[0040] The magnetic resonance radio frequency magnetic field enhancement device 1 of the high dielectric ceramic-metal composite periodic array according to an embodiment of the present invention comprises multiple composite resonant units 10 arranged in an array at a predetermined period. Each composite resonant unit 10 includes a first metal sheet 11, a second metal sheet 12, and a dielectric ceramic layer 14. The first metal sheet 11 and the second metal sheet 12 are spaced apart along the thickness direction, and the dielectric ceramic layer 14 is located between the first metal sheet 11 and the second metal sheet 12, which can form capacitive coupling between the first metal sheet 11 and the second metal sheet 12. This allows the multiple composite resonant units 10 to generate passive resonance at the Larmor frequency of the magnetic resonance system, thereby enhancing the radio frequency magnetic field strength of the test area of ​​the magnetic resonance system. This achieves passive enhancement of the radio frequency magnetic field without external power supply and active control, achieving a magnetic field enhancement of more than ten times, improving receiving sensitivity, signal-to-noise ratio, and resolution, and shortening the scanning time.

[0041] Furthermore, by arranging multiple composite resonant units 10 in an array with a predetermined period, the array arrangement configuration of the multiple composite resonant units 10 can be expanded by adjusting the period, number of rows, and number of columns, facilitating the realization of various enhancement methods with different configurations and improving the flexibility of the magnetic resonance radio frequency magnetic field enhancement device 1 of the high-dielectric ceramic-metal composite periodic array. Compared with related technologies for enhancing radio frequency magnetic fields and signal-to-noise ratio, this method has a simple structure, low cost, good compatibility, easy parameter adjustment, easy processing, and good enhancement effect.

[0042] Therefore, the magnetic resonance radio frequency magnetic field enhancement device 1 of the high dielectric ceramic-metal composite periodic array according to the present invention can realize passive magnetic field enhancement and has the advantages of simple structure, low cost, good compatibility, easy parameter adjustment, easy processing, and good enhancement effect.

[0043] The magnetic resonance radio frequency magnetic field enhancement device 1 of a high-dielectric ceramic-metal composite periodic array according to a specific embodiment of the present invention is described below with reference to the accompanying drawings.

[0044] In some specific embodiments of the present invention, such as Figures 1-7 As shown, the magnetic resonance radio frequency magnetic field enhancement device 1 of the high dielectric ceramic-metal composite periodic array according to an embodiment of the present invention includes a plurality of composite resonant units 10.

[0045] Specifically, such as Figures 1-3 , Figure 5 and Figure 6 As shown, the first metal sheet 11 is rectangular, and the second metal sheet 12 is ring-shaped. This facilitates capacitive coupling between the first metal sheet 11 and the second metal sheet 12, thereby enhancing the magnetic field.

[0046] In some embodiments, such as Figures 1-3As shown, the magnetic resonance radio frequency magnetic field enhancement device 1 of the high-dielectric ceramic-metal composite periodic array further includes a third metal sheet 13. The first metal sheet 11, the second metal sheet 12, and the third metal sheet 13 are spaced apart along the thickness direction. The dielectric ceramic layer 14 includes a first ceramic layer 141 and a second ceramic layer 142. The first ceramic layer 141 is located between the first metal sheet 11 and the second metal sheet 12, and the second ceramic layer 142 is located between the second metal sheet 12 and the third metal sheet 13. This allows capacitive coupling to be formed between the first metal sheet 11 and the second metal sheet 12, as well as between the second metal sheet 12 and the third metal sheet 13, facilitating the enhancement of the magnetic field by multiple composite resonant units 10.

[0047] Optionally, such as Figure 3 and Figure 6 As shown, the dielectric ceramic layer 14 is barium strontium titanate ceramic, with a relative permittivity of 300-800 and a thickness h of 2-6 mm. The tangent of the dielectric loss angle of the dielectric ceramic layer 14 at the Larmor frequency of the magnetic resonance system is no greater than 0.02. The side length P of the dielectric ceramic layer 14 in each composite resonant unit 10 is 15-35 mm. In other words, the predetermined period of the composite resonant unit 10 is 15-35 mm. This facilitates ensuring that the dielectric ceramic layer 14 has a high dielectric strength, has a reasonable size, and that the composite resonant unit 10 has a reasonable predetermined period.

[0048] Furthermore, such as Figure 3 and Figure 6 As shown, the thickness t of the first metal sheet 11 and the second metal sheet 12 is 0.05-2 mm, the side length w of the first metal sheet 11 is 10-25 mm, and the inner diameter r of the second metal sheet 12 is... in It is 4-12 mm and has an outer diameter r out The diameter is 5-17 mm. Specifically, the radial width rw of the annulus of the second metal sheet 12 is 1-5 mm. The third metal sheet 13 can be the same size as the first metal sheet 11. This allows the first metal sheet 11 and the second metal sheet 12 to have reasonable dimensions, which facilitates the enhancement of the magnetic field.

[0049] Advantageously, the surfaces of the first metal sheet 11 and / or the second metal sheet 12 are provided with a protective layer, which is one or more of an epoxy coating, a parylene coating, a polyimide coating, a silicone layer, or a polytetrafluoroethylene layer. This allows the protective layer to improve insulation and biocompatibility.

[0050] Specifically, the preparation method of the magnetic resonance radio frequency magnetic field enhancement device 1 of the high dielectric ceramic-metal composite periodic array includes the following steps: preparing barium strontium titanate ceramic powder and preparing it into slurry or granulated powder; obtaining a ceramic green body by molding, casting or 3D printing and sintering it to form a high dielectric ceramic layer or ceramic substrate; forming metal patches and metal ring patch patterns on the surface of the ceramic layer or ceramic substrate; arranging multiple composite resonant structure units in a two-dimensional plane according to a predetermined period to form a planar array, or arranging them along the circumferential and axial directions and fixing them to a cylindrical dielectric support to form a cylindrical ring array.

[0051] The sintering temperature is 1250-1400℃, and the ceramic grain size and dielectric loss are controlled by temperature control and heat preservation processes.

[0052] The methods for forming the metal patch include one or more of the following: copper foil lamination and etching, screen printing of conductor paste and sintering, sputtering deposition, electroless plating, or electroplating.

[0053] The composite resonant structure unit is provided with an encapsulation layer or a cover layer before and after assembly. The encapsulation layer or cover layer is used for insulation, moisture protection and biocompatibility.

[0054] In some embodiments, such as Figures 1-4 As shown, multiple composite resonant units 10 are arranged along a planar array. This facilitates the formation of a planar array.

[0055] The magnetic resonance radio frequency magnetic field enhancement device 1 of the high-dielectric ceramic-metal composite periodic array also includes an outer frame, which is disposed outside the plurality of composite resonant units 10. Specifically, the outer frame can be a metal frame, a dielectric frame, or a package frame. This facilitates the positioning, protection, or insulation isolation of the plurality of composite resonant units 10.

[0056] In some specific embodiments, such as Figures 1-4 As shown, a single composite resonant unit 10 includes, along its thickness direction, a first metal sheet 11, a first ceramic layer 141, a second metal sheet 12, a second ceramic layer 142, and a third metal sheet 13. The first metal sheet 11 and the third metal sheet 13 are rectangular, and the second metal sheet 12 is annular. The first ceramic layer 141 and the second ceramic layer 142 are made of barium strontium titanate dielectric ceramic, and the relative permittivity is preferably 600.

[0057] The inner diameter of the second metal sheet 12 is r in The diameter of the ring is 8 mm, the width of the ring plate is 2 mm, the predetermined period P is 25 mm, the width of the first metal plate 11 and the third metal plate 13 is 20 mm, the thickness of the dielectric ceramic layer 14 is 3.2 mm, and the thickness of the first metal plate 11, the second metal plate 12 and the third metal plate 13 is 2 mm.

[0058] like Figure 4 As shown, under 3T magnetic resonance (Ramohr frequency approximately 127.7 MHz) and water film loading conditions, Figure 4 (a) shows the RF magnetic field intensity distribution of the magnetic resonance RF magnetic field enhancement device 1 without a high-dielectric ceramic-metal composite periodic array. Figure 4 (b) shows the distribution of the radio frequency magnetic field strength after placing the magnetic resonance radio frequency magnetic field enhancement device 1 with a high dielectric ceramic-metal composite periodic array; as can be seen from the comparison, a significant local enhancement region is formed near the device. Figure 4 (c) further presents the radio frequency magnetic field enhancement factor curve obtained from the surface of the magnetic resonance radio frequency magnetic field enhancement device 1 of the high dielectric ceramic-metal composite periodic array along the penetration direction, showing that the near-surface region of the magnetic resonance radio frequency magnetic field enhancement device 1 of the high dielectric ceramic-metal composite periodic array can be significantly enhanced.

[0059] In other embodiments, such as Figures 5-7 As shown, the magnetic resonance radio frequency magnetic field enhancement device 1 of the high dielectric ceramic-metal composite periodic array also includes a support substrate, which is cylindrical. Multiple composite resonant units 10 are arranged in an array along the circumference and axial direction of the support substrate. The first metal sheet 11 is located radially inside the dielectric ceramic layer 14, and the second metal sheet 12 is located radially outside the dielectric ceramic layer 14. This facilitates the formation of a cylindrical array.

[0060] Optionally, the inner diameter D of the array of multiple composite resonant units 10 is 120-220 mm. This facilitates the enhancement of the magnetic field by multiple composite resonant units 10.

[0061] Specifically, the support substrate is made of a low dielectric loss, magnetically resonant compatible structural material, including polytetrafluoroethylene, photosensitive resin, polycarbonate, or composite materials thereof.

[0062] In other specific embodiments, such as Figures 5-7 As shown, the predetermined period P is 25 mm, the width w of the first metal sheet 11 is 15 mm, the thickness t of the first metal sheet 11 and the second metal sheet 12 is 0.1 mm, and the inner diameter r of the second metal sheet 12 is... in 5 mm, outer diameter r out The thickness of the dielectric ceramic layer 14 is 2-6 mm, and the thickness of the dielectric ceramic layer 14 is 8 mm. The number of ring groups M arranged along the axial direction is 8, and the number N of composite resonant units 10 included in each ring group is 19. The inner diameter D of the array of multiple composite resonant units 10 is 154 mm.

[0063] like Figure 7 As shown, a cylindrical ring array device is positioned between the magnetic resonance radio frequency coil and the object being imaged, or it is arranged in a sleeve around the object being imaged. Under 3T magnetic resonance conditions with a water film load, Figure 7 (a) and Figure 7 (b) A comparison of the radio frequency magnetic field distribution with and without the device is given. Figure 7 (c) It can be seen that the device can achieve a radio frequency magnetic field enhancement of more than 20 times in the region near the axis, thereby improving the receiving sensitivity and imaging signal-to-noise ratio.

[0064] Other configurations and operations of the magnetic resonance radio frequency magnetic field enhancement device 1 of the high dielectric ceramic-metal composite periodic array according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above 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 one or more embodiments or examples.

[0066] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A magnetic resonance radio frequency magnetic field enhancement device for a high-dielectric ceramic-metal composite periodic array, characterized in that, include: Multiple composite resonant units are arranged in an array at a predetermined period. Each composite resonant unit includes a first metal sheet, a second metal sheet, and a dielectric ceramic layer. The first metal sheet and the second metal sheet are spaced apart along the thickness direction. The dielectric ceramic layer is located between the first metal sheet and the second metal sheet to form capacitive coupling between the first metal sheet and the second metal sheet. The multiple composite resonant units are configured to generate passive resonance at the Larmor frequency of the magnetic resonance system.

2. The magnetic resonance radio frequency magnetic field enhancement device of the high-dielectric ceramic-metal composite periodic array according to claim 1, characterized in that, The first metal sheet is rectangular, and the second metal sheet is ring-shaped.

3. The magnetic resonance radio frequency magnetic field enhancement device of the high-dielectric ceramic-metal composite periodic array according to claim 1, characterized in that, It also includes a third metal sheet, and the first metal sheet, the second metal sheet and the third metal sheet are spaced apart along the thickness direction. The dielectric ceramic layer includes a first ceramic layer and a second ceramic layer, with the first ceramic layer located between the first metal sheet and the second metal sheet, and the second ceramic layer located between the second metal sheet and the third metal sheet.

4. The magnetic resonance radio frequency magnetic field enhancement device of the high-dielectric ceramic-metal composite periodic array according to claim 1, characterized in that, The dielectric ceramic layer is barium strontium titanate ceramic, the relative permittivity of the dielectric ceramic layer is 300-800, the thickness of the dielectric ceramic layer is 2-6 mm, the tangent of the dielectric loss angle of the dielectric ceramic layer at the Larmor frequency of the magnetic resonance system is not greater than 0.02, and the side length of the dielectric ceramic layer of each composite resonant unit is 15-35 mm.

5. The magnetic resonance radio frequency magnetic field enhancement device for a high-dielectric ceramic-metal composite periodic array according to claim 1, characterized in that, The thickness of the first metal sheet and the second metal sheet is 0.05-2 mm, the side length of the first metal sheet is 10-25 mm, and the inner diameter of the second metal sheet is 4-12 mm and the outer diameter is 5-17 mm.

6. The magnetic resonance radio frequency magnetic field enhancement device of the high-dielectric ceramic-metal composite periodic array according to claim 1, characterized in that, The surface of the first metal sheet and / or the second metal sheet is provided with a protective layer, which is any one or more of epoxy coating, parylene coating, polyimide coating, silicone layer or polytetrafluoroethylene layer.

7. The magnetic resonance radio frequency magnetic field enhancement device of the high-dielectric ceramic-metal composite periodic array according to claim 1, characterized in that, Multiple composite resonant units are arranged in a planar array.

8. The magnetic resonance radio frequency magnetic field enhancement device for a high-dielectric ceramic-metal composite periodic array according to claim 7, characterized in that, It also includes an outer frame, which is disposed outside the plurality of composite resonant units.

9. The magnetic resonance radio frequency magnetic field enhancement device of the high-dielectric ceramic-metal composite periodic array according to claim 1, characterized in that, It also includes a support substrate, which is cylindrical, and a plurality of the composite resonant units are arranged in an array along the circumference and axial direction of the support substrate. The first metal sheet is located radially inside the dielectric ceramic layer and the second metal sheet is located radially outside the dielectric ceramic layer.

10. The magnetic resonance radio frequency magnetic field enhancement device for a high-dielectric ceramic-metal composite periodic array according to claim 9, characterized in that, The inner diameter of the array of multiple composite resonant units is 120-220 mm.

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