CN-121978600-A - 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, wherein the composite resonance units are arranged in an array mode at a preset period, 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 intervals along the thickness direction, the dielectric ceramic layer is positioned between the first metal sheet and the second metal sheet so that the first metal sheet and the second metal sheet form capacitive coupling, and the composite resonance units are configured to be suitable for generating passive resonance at the larmor frequency of a magnetic resonance system. The magnetic resonance radio frequency magnetic field enhancement device of the high dielectric ceramic metal composite periodic array can realize passive magnetic field enhancement and has the advantages of simple structure, low cost, good compatibility, easy parameter adjustment, easy processing, good enhancement effect and the like.

Inventors

• ZHAO QIAN
• Wen Jingda
• SUN JINGBO
• ZHOU JI

Assignees

• 清华大学

Dates

Publication Date

20260505

Application Date

20260212

Claims (10)

1. 1. A magnetic resonance radio frequency magnetic field enhancement device of a high dielectric ceramic metal composite periodic array, comprising: The composite resonance units are arranged in an array mode in a preset period, 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 intervals along the thickness direction, the dielectric ceramic layer is located between the first metal sheet and the second metal sheet so that the first metal sheet and the second metal sheet form capacitive coupling, and the composite resonance units are configured to be suitable for generating passive resonance at the larmor frequency of the magnetic resonance system.
2. 2. The high dielectric ceramic metal composite periodic array magnetic resonance radio frequency magnetic field enhancement device according to claim 1, wherein the first metal sheet is rectangular and the second metal sheet is annular.
3. 3. The high dielectric ceramic metal composite periodic array magnetic resonance radio frequency magnetic field reinforcing device according to claim 1, further comprising a third metal sheet, wherein the first metal sheet, the second metal sheet and the third metal sheet are arranged at intervals in a thickness direction, the dielectric ceramic layer comprises a first ceramic layer and a second ceramic layer, 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.
4. 4. The magnetic resonance radio frequency magnetic field enhancement device of the high dielectric ceramic metal composite periodic array according to claim 1, wherein the dielectric ceramic layer is barium strontium titanate ceramic, the relative dielectric constant of the dielectric ceramic layer is 300-800, the thickness of the dielectric ceramic layer is 2-6 mm, the tangent value of the dielectric ceramic layer at the larmor frequency of the magnetic resonance system is not more than 0.02, and the side length of the dielectric ceramic layer of each composite resonance unit is 15-35 mm.
5. 5. The high dielectric ceramic metal composite periodic array magnetic resonance radio frequency magnetic field reinforcing device according to claim 1, wherein 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, the inner diameter of the second metal sheet is 4-12 mm and the outer diameter is 5-17 mm.
6. 6. The magnetic resonance radio frequency magnetic field enhancement device of the high dielectric ceramic metal composite periodic array according to claim 1, wherein a protective layer is arranged on the surface of the first metal sheet and/or the second metal sheet, and the protective layer is any one or more of an epoxy coating, a parylene coating, a polyimide coating, a silica gel layer or a polytetrafluoroethylene layer.
7. 7. The high dielectric ceramic metal composite periodic array magnetic resonance radio frequency magnetic field enhancement device according to claim 1, wherein a plurality of the composite resonance units are arranged along a planar array.
8. 8. The high dielectric ceramic metal composite periodic array magnetic resonance radio frequency magnetic field enhancement device according to claim 7, further comprising an outer frame, wherein the outer frame is disposed outside the plurality of composite resonance units.
9. 9. The high dielectric ceramic metal composite periodic array magnetic resonance radio frequency magnetic field enhancement device according to claim 1, further comprising a supporting base body, wherein the supporting base body is cylindrical, a plurality of composite resonance units are arrayed along the circumferential direction and the axial direction of the supporting base body, the first metal sheet is located on the radial inner side of the dielectric ceramic layer, and the second metal sheet is located on the radial outer side of the dielectric ceramic layer.
10. 10. The high dielectric ceramic metal composite periodic array magnetic resonance radio frequency magnetic field reinforcing device according to claim 9, wherein the inner diameter of the array of the plurality of composite resonance units is 120-220 mm.

Description

Magnetic resonance radio frequency magnetic field enhancement device of high dielectric ceramic metal composite periodic array Technical Field The invention relates to the technical field of magnetic resonance imaging radio frequency enhancement, in particular to a magnetic resonance radio frequency magnetic field enhancement device of a high dielectric ceramic metal composite periodic array. Background Magnetic resonance imaging relies on radio frequency coils to generate a receive radio frequency magnetic field (B1 field). In clinical and scientific imaging, the B1 field strength and uniformity of a target area are often limited due to factors such as coil structure, sample load dielectric effect, radio frequency loss, fluctuation effect under high field conditions and the like, so that the imaging signal-to-noise ratio is insufficient, the resolution is limited or the scanning time is prolonged. The means for improving the B1 field or the signal to noise ratio of the magnetic resonance imaging equipment in the related technology comprise improving a coil structure, using a dielectric gasket, adopting an electromagnetic metamaterial/super-surface enhancement device and the like, but the coil is high in transformation cost and strict in system compatibility requirement, the enhancement capability of the dielectric gasket is limited and heavy, the metamaterial device is complex in structure, parameters are difficult to be matched accurately or sensitive to loads, and engineering application stability is affected. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the magnetic resonance radio frequency magnetic field enhancement device of the high-dielectric ceramic metal composite periodic array, which can realize passive magnetic field enhancement and has the advantages of simple structure, low cost, good compatibility, easy parameter adjustment, easy processing, good enhancement effect and the like. In order to achieve the above object, according to an embodiment of the present invention, there is provided 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 including a plurality of composite resonance units arranged in an array at a predetermined period, each of the composite resonance units including a first metal sheet, a second metal sheet, and a dielectric ceramic layer disposed at intervals in a thickness direction, the dielectric ceramic layer being located between the first metal sheet and the second metal sheet such that the first metal sheet and the second metal sheet form capacitive coupling, the plurality of composite resonance units being configured to be adapted to generate passive resonance at a larmor frequency of a magnetic resonance system. The magnetic resonance radio frequency magnetic field enhancement device of the high dielectric ceramic metal composite periodic array can realize passive magnetic field enhancement and has the advantages of simple structure, low cost, good compatibility, easy parameter adjustment, easy processing, good enhancement effect and the like. In addition, the magnetic resonance radio frequency magnetic field enhancement device of the high dielectric ceramic metal composite periodic array according to the embodiment of the invention can also have the following additional technical characteristics: according to one embodiment of the invention, the first metal sheet is rectangular and the second metal sheet is annular. 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 a third metal sheet, the first metal sheet, the second metal sheet and the third metal sheet are disposed at intervals along a thickness direction, the dielectric ceramic layer includes a first ceramic layer and a second ceramic layer, 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. According to one embodiment of the invention, the dielectric ceramic layer is barium strontium titanate ceramic, the relative dielectric constant of the dielectric ceramic layer is 300-800, the thickness of the dielectric ceramic layer is 2-6 mm, the tangent value of the dielectric ceramic layer at the larmor frequency of the magnetic resonance system is not more than 0.02, and the side length of the dielectric ceramic layer of each composite resonance unit is 15-35 mm. According to one embodiment of the invention, the thickness of the first metal sheet and the second metal sheet is 0.05-2 mm, the side length