CN103367921B - A kind of Meta Materials and MRI magnetic signal enhancement device - Google Patents
A kind of Meta Materials and MRI magnetic signal enhancement device Download PDFInfo
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- CN103367921B CN103367921B CN201210093039.3A CN201210093039A CN103367921B CN 103367921 B CN103367921 B CN 103367921B CN 201210093039 A CN201210093039 A CN 201210093039A CN 103367921 B CN103367921 B CN 103367921B
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Abstract
The present invention provides a kind of Meta Materials, include the metamaterial unit of multiple array arrangements, metamaterial unit is made up of substrate and the man-made microstructure being attached on substrate, man-made microstructure is two opening resonance loop structures mutually faced that are open, opening resonance loop structure includes two helixes that single radial cut resonant ring and two distal points from single radial cut resonant ring extend to ring internal helicoid respectively, two helixes mutually disjoint and not intersected with single radial cut resonant ring, and helix is the derived structure of circular helical-line or circular helical-line.The Meta Materials have high negative magnetoconductivity, based on the high negative-magnetic-permeability meta-material, and the present invention also provides a kind of MRI magnetic signal enhancement device, and MRI magnetic signal enhancement device is to bear this characteristic using the magnetic conductivity of negative-magnetic-permeability meta-material, reaches the effect of signal enhancing.
Description
Technical field
The present invention relates to MRI technical field of imaging, more particularly to a kind of magnetic signal enhancing device being imaged for MRI.
Background technology
At present, international community is to existing substantial amounts of research in terms of magnetic conductivity, wherein the research for positive magnetic conductivity has become
In maturation, the research for negative-magnetic-permeability meta-material is the present focus studied both at home and abroad, and negative magnetoconductivity has quantum polarization work
With, polarization can be produced to incidence wave, therefore sphere of action is very big, the magnetic resonance imaging skill such as in medical imaging field
Art, negative magnetic-inductive capacity material can strengthen the imaging effect of electromagnetic wave, and negative magnetic-inductive capacity material also has weight in terms of lens research in addition
Act on, in engineering field, magnetic conductivity, generally all referring to relative permeability, is the absolute permeability μ and magnetic constant μ of material0
The ratio of (also known as space permeability), μr=μ/μ0, dimensionless number.Generally " relative " two word and symbol subscript r is all removed.Magnetic
Conductance is when representing that material is acted on by magnetizing field H, internal increase (μ ＞ 1) of the true magnetic field relative to H or reduces (μ ＜ 1)
Degree.So far in the already present material of nature found, μ will be generally above 0.The geometry of existing magnetic micro-structure
For I-shaped or the open annular of similar concave as shown in Figure 1, but both structures can not all realize magnetic permeability μ
It is significantly less than 0 or reduces meta-material resonant frequency, only by designing the magnetic micro-structure with special geometric figure, ability
The artificial electromagnetic material is set to reach that magnetic permeability μ value is less than 0 in special frequency channel, and with relatively low resonant frequency.
The principle of nuclear magnetic resonance (MRI) imaging system be using coil go detect nuclear spin absorb and transmitting it is wireless
Electric wave pulse energy, the coil is sometimes also being used as transmitting coil simultaneously as receiving coil.In radio wave pulses energy
With the help of amount, Magnetic resonance imaging scanner can position in patient's body a very small point, it is then determined which kind of this is
The tissue of type.Magnetic resonance imaging machine device uses the radio frequency pulse specific to hydrogen atom.System guides pulse is aligned
The body region to be checked, and cause the region proton uptake make they rotate in different directions or precession needed for energy
Amount.This is NMR imaging device " resonance " part.Radio frequency pulse forces them (to refer to many in every 1,000,000 proton
Remaining a pair or two pairs of unmatched protons) rotated under specific frequency according to specific direction.Trigger the specific frequency of resonance
It is referred to as Rameau that frequency, the value is to calculate to draw according to the particular organization to be imaged and the magnetic field intensity of main field.Nothing
Line electricity frequency pulse is generally provided using a coil, and the coil is referred to as transmitting coil.Existing magnetic resonance imaging device
Receiving coil must quite near-earth be close to detected part, to obtain the magnetic signal discharged by detected part.
Meta Materials refer to that some have the artificial composite structure of the extraordinary physical property not available for natural material or compound
Material.By the structurally ordered design on the key physical yardstick of material, the limitation of some apparent natural laws can be broken through,
So as to obtain the meta-materials function beyond the intrinsic common property of nature.The property and function of Meta Materials mostly come from it
Internal structure rather than constitute their material.At present, the geometry of existing metal man-made microstructure be I-shaped or
The open annular of person's similar concave as shown in Figure 1, but this structure can not all realize that magnetic permeability μ is significantly less than 0 or makes to surpass
Material resonances frequency is reduced, and can not realize isotropism, only artificial micro- by designing the metal with special geometric figure
Structure, could cause the artificial electromagnetic material to reach that magnetic permeability μ value is less than 0 in special frequency channel, and with relatively low resonance frequency
Rate.
The content of the invention
The technical problems to be solved by the invention are that there is provided a kind of super material with high negative magnetoconductivity, low resonant frequency
Material, using the high negative-magnetic-permeability meta-material, a kind of magnetic signal enhancing device is provided for MRI imaging devices.
The present invention realizes that the technical scheme that goal of the invention is used is to provide a kind of Meta Materials, including multiple array arrangements
Metamaterial unit, metamaterial unit is made up of substrate and the man-made microstructure being attached on substrate, and man-made microstructure is two and opened
The opening resonance loop structure that mutually faces of mouth, opening resonance loop structure include single radial cut resonant ring and from single radial cut resonant ring two
Two helixes that distal point extends to ring internal helicoid respectively, two helixes mutually disjoint and not with single radial cut resonance
Ring intersects, and helix is the derived structure of circular helical-line or circular helical-line.
Preferably, the substrate is by ceramic material, epoxy resin, polytetrafluoroethylene (PTFE), FR-4 composites or F4B composite woods
Material is made.
Preferably, the helix is wire spiral.
Preferably, the line width of the helix is 0.1-0.2mm.
Preferably, the line spacing of the helix is 0.1-0.2mm.
Preferably, the nested number of turns of the helix is all higher than 1 circle.
Preferably, the thickness of the substrate is 0.1-0.5mm.
The present invention also provides a kind of MRI magnetic signal enhancement device, MRI magnetic signal enhancement device be arranged on detected part with
Between the magnetic signal receiving coil of MRI imaging devices, MRI magnetic signal enhancement device includes shell and is arranged in shell extremely
Few one layer of Meta Materials, the Meta Materials are the Meta Materials with preceding feature.
The beneficial effects of the invention are as follows：Two equivalent to one resonant tanks of split ring resonator mutually faced that are open, increase
Strong response of the man-made microstructure to magnetic signal, in addition, by the multiple coiling of helix, adding the length of man-made microstructure
Degree, equivalent to the inductance for adding Meta Materials, in the case where Meta Materials electric capacity is constant, inductance increase, the resonance frequency of Meta Materials
Rate is reduced, therefore, and the present invention obtains a kind of new high negative-magnetic-permeability meta-material, based on the high negative-magnetic-permeability meta-material, the present invention
A kind of MRI magnetic signal enhancement device is also provided, MRI magnetic signal enhancement device is to bear this using the magnetic conductivity of negative-magnetic-permeability meta-material
One characteristic, reaches the effect of signal enhancing, and reduces the resonant frequency of negative-magnetic-permeability meta-material, is to obtain closer to MRI
The working frequency of imaging device, makes MRI imaging device imaging effects more preferable.
Brief description of the drawings
Fig. 1, prior art magnetic man-made microstructure schematic diagram；
Fig. 2, metamaterial structure schematic diagram of the present invention；
Fig. 3, preferred embodiment of the present invention man-made microstructure schematic diagram；
Fig. 4, further embodiment of this invention man-made microstructure schematic diagram；
Fig. 5, another embodiment of the present invention man-made microstructure schematic diagram；
Fig. 6, preferred embodiment of the present invention man-made microstructure polar coordinates schematic diagram；
Fig. 7, magnetic conductivity simulated effect schematic diagram of the present invention；
Fig. 8, MRI magnetic signal enhancement device structural representation；
1 Meta Materials, 10 metamaterial units, 01 preferred embodiment of the present invention man-made microstructure schematic diagram, 02 present invention is another
Embodiment man-made microstructure schematic diagram, 03 another embodiment of the present invention man-made microstructure schematic diagram, 11 shells.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
The present invention provides a kind of Meta Materials 1, includes the metamaterial unit 10 of multiple array arrangements, metamaterial unit 10 is by base
Plate and the man-made microstructure 01 being attached on substrate are constituted, as shown in figure 3, man-made microstructure 01, which is two, is open what is mutually faced
Opening resonance loop structure, opening resonance loop structure include single radial cut resonant ring and two distal points from single radial cut resonant ring respectively to
Two helixes that ring internal helicoid extends, two helixes mutually disjoint and not intersected with single radial cut resonant ring, such as scheme
4th, shown in Fig. 5, further embodiment of this invention man-made microstructure 02 is circular spiral shell with another embodiment of the present invention man-made microstructure 03
The derived structure of spin line.
It should be appreciated that preferred embodiment of the present invention man-made microstructure 01, further embodiment of this invention man-made microstructure 02 with
Another embodiment of the present invention man-made microstructure 03 is torus, and the nested number of turns of torus should be greater than 1 circle, and a this paper circle is
Refer to as shown in fig. 6, ring-shaped inner part that the circular torus of preferred embodiment of the present invention man-made microstructure 01 is surrounded is a bit
Polar limit Oe, from limit O in the circular distal point of torus twoeA near distal point is sat to the line of limit for the pole
Target pole axis, it is positive direction counterclockwise to take, then uses polar coordinates (ρ successively along the every bit on circular toruse, θ) represent, often
It is a circle to one 360 degree, until reaching another distal point remote from limit on circular torus.
It should be appreciated that the nested number of turns of increase torus, equivalent to adding the length of man-made microstructure, that is, increases
The inductance of man-made microstructure, in the case where electric capacity is constant, inductance increase, the resonant frequency reduction of Meta Materials.It is super in design
During material, the means such as size and structure by changing Meta Materials man-made microstructure can obtain ringing with different electromagnetism
The Meta Materials of frequency are answered, to meet concrete application.
It should be appreciated that present invention circle torus and its derived structure are generally metal wire, such as copper cash, silver wire, even
It is gold thread, can also is conductive plastics sometimes, the line width of circular torus is 0.1-0.2mm, and the line spacing of circular torus is
0.1-0.2mm。
It should be appreciated that metamaterial substrate of the present invention is by ceramic material, epoxy resin, polytetrafluoroethylene (PTFE), FR-4 composites
Or F4B composites are made, substrate thickness is 0.1-0.5mm.
It should be appreciated that for the electromagnetic wave of specific frequency, the size of Meta Materials man-made microstructure 01 is in electromagnetic wavelength
1/1 to five/10ths in the range of when (preferably 1/10th), Meta Materials could produce specific response to electromagnetic wave,
Shown as in electromagnetic property with special effective dielectric constant and equivalent permeability, Meta Materials are in negative magnetoconductivity, are exactly led to
Cross and design specific man-made microstructure, make material that there is negative magnetic conductivity in electromagnetic property in itself.
It should be appreciated that being emulated with CST Studio Suite 2010 to one embodiment of the present invention, make during emulation
Technical parameter is：Man-made microstructure 01 copper cash line width 0.15mm, line spacing 0.15mm, substrate is ceramic substrate, its thickness
For 0.2mm, the size of man-made microstructure 01 is 15mm × 15mm, and magnetic conductivity simulated effect schematic diagram of the present invention is referring to Fig. 7, by scheming
Understand, the Meta Materials are approximately equal to -1 in 220GHz magnetic conductivities.
Based on above-mentioned negative-magnetic-permeability meta-material, the present invention also provides a kind of MRI magnetic signal enhancement device, referring to Fig. 8, including
Shell 11 and at least one layer of Meta Materials 1 being arranged in shell 11, the reception line that device is placed in MRI machine is strengthened by the magnetic signal
Between circle and user, the man-made microstructure in Meta Materials 1 passes through particular design, the frequency under the conditions of negative magnetoconductivity and MRI works
When working frequency is identical, with MRI receiving coils produce response, enhance the magnetic signal of receiving coil, thus Contrast-enhanced MRI system into
As quality, receiving coil is set to abut detected part.
Above-described embodiment in the present invention has only made exemplary description, and those skilled in the art are after present patent application is read
Various modifications can be carried out to the present invention without departing from the spirit and scope of the present invention.
Claims (6)
1. a kind of Meta Materials, include the metamaterial unit of multiple array arrangements, it is characterised in that the metamaterial unit is by substrate
With the man-made microstructure composition being attached on substrate, the man-made microstructure is two split ring resonator knots mutually faced that are open
Structure, two distal points of the opening resonance loop structure including single radial cut resonant ring and from the single radial cut resonant ring are respectively into ring
Two helixes that portion is extended spirally out, two helixes mutually disjoint and not intersected with the single radial cut resonant ring,
The helix is the derived structure of circular helical-line or circular helical-line, and the helix is metal wire helix or conductive modeling
Expect helix, the nested number of turns of the helix is more than 1 circle.
2. Meta Materials according to claim 1, it is characterised in that the substrate is by ceramic material, epoxy resin, polytetrafluoro
Ethene, FR-4 composites or F4B composites are made.
3. Meta Materials according to claim 1, it is characterised in that the line width of the helix is 0.1-0.2mm.
4. Meta Materials according to claim 1, it is characterised in that the line spacing of the helix is 0.1-0.2mm.
5. Meta Materials according to claim 1, it is characterised in that the thickness of the substrate is 0.1-0.5mm.
6. a kind of MRI magnetic signal enhancement device, it is characterised in that the MRI magnetic signal enhancement device be arranged on detected part with
Between the magnetic signal receiving coil of MRI imaging devices, the MRI magnetic signal enhancement device includes shell and is arranged in shell
At least one layer of Meta Materials, the Meta Materials be claim any one of 1-5 described in Meta Materials.
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| CN103367921B true CN103367921B (en) | 2017-08-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106711617B (en) * | 2017-02-24 | 2023-08-22 | 华南理工大学 | Plane lens for focusing and amplifying near magnetic field by utilizing magnetic ring dipole |
| WO2018226946A1 (en) * | 2017-06-07 | 2018-12-13 | Trustees Of Boston University | Apparatus for improving magnetic resonance imaging |
| CN117148242B (en) * | 2023-10-31 | 2024-01-23 | 天津天达图治科技有限公司 | Magnetic field enhancer based on metamaterial, surface coil and decoupling super surface |
| CN117148243B (en) * | 2023-11-01 | 2024-01-23 | 天津天达图治科技有限公司 | Magnetic resonance imaging metamaterial and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5793336A (en) * | 1996-06-10 | 1998-08-11 | Antennas America, Inc. | Conformal antenna assemblies |
| CN101667680A (en) * | 2009-08-31 | 2010-03-10 | 深圳市启汉科技有限公司 | Monopole radio frequency antenna |
| CN101901962A (en) * | 2009-05-27 | 2010-12-01 | 财团法人工业技术研究院 | Radiation field type isolator as well as antenna system thereof and communication device using same |
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| US8054146B2 (en) * | 2005-11-14 | 2011-11-08 | Iowa State University Research Foundation, Inc. | Structures with negative index of refraction |
| US20110204891A1 (en) * | 2009-06-25 | 2011-08-25 | Lockheed Martin Corporation | Direct magnetic imaging apparatus and method |
| KR101703846B1 (en) * | 2010-09-27 | 2017-02-08 | 삼성전자주식회사 | Multi-layered hybrid metamaterial structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5793336A (en) * | 1996-06-10 | 1998-08-11 | Antennas America, Inc. | Conformal antenna assemblies |
| CN101901962A (en) * | 2009-05-27 | 2010-12-01 | 财团法人工业技术研究院 | Radiation field type isolator as well as antenna system thereof and communication device using same |
| CN101667680A (en) * | 2009-08-31 | 2010-03-10 | 深圳市启汉科技有限公司 | Monopole radio frequency antenna |
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Effective date of registration: 20210526 Address after: 2 / F, software building, No.9, Gaoxin Zhongyi Road, Nanshan District, Shenzhen City, Guangdong Province Patentee after: KUANG-CHI INSTITUTE OF ADVANCED TECHNOLOGY Address before: 18B, building a, CIC international business center, 1061 Xiangmei Road, Futian District, Shenzhen, Guangdong 518034 Patentee before: KUANG-CHI INNOVATIVE TECHNOLOGY Ltd. |