CN103367921A - Meta-material and MRI magnetic signal enhancement device - Google Patents
Meta-material and MRI magnetic signal enhancement device Download PDFInfo
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- CN103367921A CN103367921A CN2012100930393A CN201210093039A CN103367921A CN 103367921 A CN103367921 A CN 103367921A CN 2012100930393 A CN2012100930393 A CN 2012100930393A CN 201210093039 A CN201210093039 A CN 201210093039A CN 103367921 A CN103367921 A CN 103367921A
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Abstract
The invention provides a meta-material. The meta-material comprises a plurality of meta-material units arranged in an array. Each meta-material unit is composed of a substrate and an artificial microstructure attached to the substrate; each artificial microstructure is composed of two split resonant ring structures with splits opposite to each other; each split resonant ring structure comprises a single split resonant ring and two spiral lines spirally extending out respectively towards the interior of the ring from the two tail end points of the single split resonant ring, wherein the two spiral lines do not intersect with each other and also both do not intersect with the single split resonant ring; and the spiral lines are circular spiral lines or the derived structures of the circular spiral lines. The meta-material has the advantages of high negative magnetic permeability. The invention also provides an MRI magnetic signal enhancement device based on the high negative magnetic permeability meta-material. The MRI magnetic signal enhancement device enables signals to be enhanced by making use of the characteristic that the magnetic permeability of the negative magnetic permeability meta-material is negative, and the imaging effects of MRI imaging equipment become better.
Description
Technical field
The present invention relates to the MRI technical field of imaging, relate to particularly a kind of magnetic signal enhance device for the MRI imaging.
Background technology
At present, international community is to the existing a large amount of research in magnetic permeability aspect, wherein the research for positive magnetic permeability has been tending towards ripe, research for negative-magnetic-permeability meta-material is the focus of studying both at home and abroad now, negative magnetoconductivity has the quantum polarization, can produce polarization to incident wave, therefore sphere of action is very large, such as the mr imaging technique in the medical imaging field, negative magnetic-inductive capacity material can be strengthened electromagnetic imaging effect, and negative magnetic-inductive capacity material is also playing an important role aspect the lens research, at engineering field in addition, magnetic permeability all refers to relative permeability usually, is absolute permeability μ and the magnetic constant μ of material
0The ratio of (claiming again permeability of vacuum), μ
r=μ/μ
0, dimensionless number.Usually " relatively " two words and symbol subscript r are removed.Magnetic permeability is to represent that material is subject to magnetizing field H and does the time spent, and inner true magnetic field is with respect to the degree of increase (μ＞1) or the minimizing (μ＜1) of H.So far in the already present material of nature of finding, μ is generally greater than 0.The geometry of existing magnetic micro-structure is the open annular of " worker " font or similar " recessed " font as shown in Figure 1, but these two kinds of structures all can not realize magnetic permeability μ and be significantly less than 0 or super material resonances frequency is reduced, only has the magnetic micro-structure that has the special geometric figure by design, just can make this artificial electromagnetic material in special frequency channel, reach magnetic permeability μ value less than 0, and have lower resonance frequency.
The principle of nulcear magnetic resonance (NMR) (MRI) imaging system is to utilize coil to remove to detect the radio wave pulses energy that nuclear spin absorbs and launches, and this coil is being gone back simultaneously as transmitting coil sometimes as receiving coil.Under the help of radio wave pulses energy, the Magnetic resonance imaging scanner can the position patient body in a very little point, determine that then this is the tissue of which kind of type.The magnetic resonance imaging machine device adopts the radio frequency pulse specific to hydrogen atom.System's pilot pulse is aimed at the body region that will check, and causes this regional proton uptake to make them with different directions rotation or the required energy of precession.This is NMR imaging device " resonance " part.Radio frequency pulse forces their (referring to a pair of or two pairs of unmatched protons unnecessary in each 1,000,000 proton) to be rotated according to specific direction under characteristic frequency.The characteristic frequency that causes resonance is called as Rameau that frequency, and this value is to calculate according to the magnetic field intensity of the particular organization that wants imaging and main field to draw.Radio frequency pulse utilizes a coil to provide usually, and this coil is called transmitting coil.The necessary quite near-earth of the receiving coil of existing Magnetic resonance imaging equipment is near detected part, to obtain the magnetic signal that is discharged by detected part.
Super material refers to artificial composite structure or the composite material that some have the not available extraordinary physical property of natural material.Structurally ordered design by on the key physical yardstick of material can break through the restriction of some apparent natural law, thereby obtains to exceed the meta-materials function of the intrinsic common character of nature.Super material character and function mainly come from its inner structure but not consist of their material.At present, the geometry of the artificial micro-structural of existing metal is the open annular of " worker " font or similar " recessed " font as shown in Figure 1, but this structure all can not realize magnetic permeability μ and be significantly less than 0 or super material resonances frequency is reduced, can not realize isotropism, only has the artificial micro-structural of metal that has the special geometric figure by design, could be so that this artificial electromagnetic material reach magnetic permeability μ value less than 0 in special frequency channel, and have lower resonance frequency.
Summary of the invention
Technical problem to be solved by this invention is, a kind of super material with high negative magnetoconductivity, low resonant frequency is provided, and utilizes this high negative-magnetic-permeability meta-material, for the MRI imaging device provides a kind of magnetic signal enhance device.
The present invention realizes that the technical scheme that goal of the invention adopts is, a kind of super material is provided, the super material cell that comprises a plurality of array arrangements, super material cell is comprised of substrate and the artificial micro-structural that is attached on the substrate, artificial micro-structural be two openings mutually over against opening resonance loop structure, opening resonance loop structure comprise the single radial cut resonant ring and from two distal points of single radial cut resonant ring respectively to extended two helixes of ring internal helicoid, article two, helix mutually disjoints and does not all intersect with the single radial cut resonant ring, and helix is the derived structure of circular helical-line or circular helical-line.
Preferably, described substrate is made by ceramic material, epoxy resin, polytetrafluoroethylene, FR-4 composite material or F4B composite material.
Preferably, described helix is wire spiral.
Preferably, the live width of described helix is 0.1-0.2mm.
Preferably, the distance between centers of tracks of described helix is 0.1-0.2mm.
Preferably, the nested number of turns of described helix is all greater than 1 circle.
Preferably, the thickness of described substrate is 0.1-0.5mm.
The present invention also provides a kind of MRI magnetic signal enhance device, MRI magnetic signal enhance device is arranged between the magnetic signal receiving coil of detected part and MRI imaging device, MRI magnetic signal enhance device comprises shell and the setting super material of at least one deck in the enclosure, and this super material is the super material with aforementioned feature.
The invention has the beneficial effects as follows: two openings mutually over against split ring resonator be equivalent to a resonant tank, strengthened artificial micro-structural to the response of magnetic signal, in addition, multiple coiling by helix, increased the length of artificial micro-structural, be equivalent to increase the inductance of super material, in the constant situation of super material electric capacity, inductance increases, and the resonance frequency of super material reduces, therefore, the present invention obtains a kind of novel high negative-magnetic-permeability meta-material, based on this high negative-magnetic-permeability meta-material, the present invention also provides a kind of MRI magnetic signal enhance device, and MRI magnetic signal enhance device utilizes the magnetic permeability of negative-magnetic-permeability meta-material to be negative this characteristic, reach the effect that signal strengthens, and reduce the resonance frequency of negative-magnetic-permeability meta-material, be to make MRI imaging device imaging effect better in order to obtain more near the operating frequency of MRI imaging device.
Description of drawings
Fig. 1, the artificial micro-structural schematic diagram of prior art magnetic;
Fig. 2, metamaterial structure schematic diagram of the present invention;
Fig. 3, the artificial micro-structural schematic diagram of the preferred embodiment of the present invention;
Fig. 4, the artificial micro-structural schematic diagram of further embodiment of this invention;
Fig. 5, the artificial micro-structural schematic diagram of another embodiment of the present invention;
Fig. 6, the artificial micro-structural polar coordinates of preferred embodiment of the present invention schematic diagram;
Fig. 7, magnetic permeability simulated effect schematic diagram of the present invention;
Fig. 8, MRI magnetic signal enhance device structural representation;
1 surpass material, 10 surpass material cell, the artificial micro-structural schematic diagram of 01 preferred embodiment of the present invention, the artificial micro-structural schematic diagram of 02 further embodiment of this invention, the artificial micro-structural schematic diagram of 03 another embodiment of the present invention, 11 shells.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
The invention provides a kind of super material 1, the super material cell 10 that comprises a plurality of array arrangements, super material cell 10 is comprised of substrate and the artificial micro-structural 01 that is attached on the substrate, as shown in Figure 3, artificial micro-structural 01 be two openings mutually over against opening resonance loop structure, opening resonance loop structure comprise the single radial cut resonant ring and from two distal points of single radial cut resonant ring respectively to extended two helixes of ring internal helicoid, article two, helix mutually disjoints and does not all intersect with the single radial cut resonant ring, such as Fig. 4, shown in Figure 5, the artificial micro-structural 02 of further embodiment of this invention is the derived structure of circular helical-line with the artificial micro-structural 03 of another embodiment of the present invention.
Be to be understood that, the artificial micro-structural 01 of the preferred embodiment of the present invention, the artificial micro-structural 02 of further embodiment of this invention are torus with the artificial micro-structural 03 of another embodiment of the present invention, the nested number of turns of torus should be greater than 1 circle, the circle of this paper, refer to that as shown in Figure 6 any of the ring-shaped inner part that the circular torus of the artificial micro-structural 01 of the preferred embodiment of the present invention surrounds is polar limit O
e, in circular torus two distal points from limit O
eNear distal point line to the extreme is this polar pole axis, and getting is positive direction counterclockwise, then uses successively polar coordinates (ρ along the every bit on the circular torus
e, represent that θ) every one 360 degree is a circle, until reach on the circular torus another distal point away from the limit.
Should be appreciated that the nested number of turns that increases torus, be equivalent to increase the length of artificial micro-structural, namely increased the inductance of artificial micro-structural, in the constant situation of electric capacity, inductance increases, the resonance frequency reduction of super material.In design during super material, the means such as the size by changing the artificial micro-structural of super material and structure, the super material that can obtain having different electromagnetic response frequencies is to satisfy specifically application.
Should be appreciated that the circular torus of the present invention and derived structure thereof are generally metal wire, for example copper cash, silver-colored line, or even gold thread also can be conductive plastics sometimes, and the live width of circular torus is 0.1-0.2mm, and the distance between centers of tracks of circular torus is 0.1-0.2mm.
Should be appreciated that the super material substrate of the present invention is made by ceramic material, epoxy resin, polytetrafluoroethylene, FR-4 composite material or F4B composite material, substrate thickness is 0.1-0.5mm.
Be to be understood that, for the electromagnetic wave of characteristic frequency, the size of the artificial micro-structural 01 of super material is in 1/10th to 1/5th scopes of electromagnetic wavelength the time (preferred 1/10th), super material could produce specific response to electromagnetic wave, show as in electromagnetic property and to have special effective dielectric constant and equivalent permeability, super material is negative magnetoconductivity, and by the specific artificial micro-structural of design, make material this has negative magnetic permeability on electromagnetic property just.
Be to be understood that, carry out emulation with 2010 pairs of one embodiment of the present invention of CST Studio Suite, the technical parameter that uses during emulation is: artificial micro-structural 01 copper cash live width 0.15mm, distance between centers of tracks 0.15mm, substrate are ceramic substrate, and its thickness is 0.2mm, artificial micro-structural 01 is of a size of 15mm * 15mm, magnetic permeability simulated effect schematic diagram of the present invention is referring to Fig. 7, and as seen from the figure, this super material approximates-1 at the 220GHz magnetic permeability.
Based on above-mentioned negative-magnetic-permeability meta-material, the present invention also provides a kind of MRI magnetic signal enhance device, referring to Fig. 8, comprise shell 11 and be arranged on the super material 1 of at least one deck in the shell 11, this magnetic signal enhance device is placed between the receiving coil and user of MRI equipment, artificial micro-structural in the super material 1 is through particular design, when the frequency under the negative magnetoconductivity condition is identical with the MRI operating frequency, produce response with the MRI receiving coil, strengthened the magnetic signal of receiving coil, thereby the image quality of Contrast-enhanced MRI system makes the receiving coil needn't be near detected part.
Above-described embodiment among the present invention has only been done exemplary description, and those skilled in the art can carry out various modifications to the present invention in the situation that does not break away from the spirit and scope of the present invention after reading present patent application.
Claims (8)
1. super material, the super material cell that comprises a plurality of array arrangements, it is characterized in that, described super material cell is comprised of substrate and the artificial micro-structural that is attached on the substrate, described artificial micro-structural be two openings mutually over against opening resonance loop structure, described opening resonance loop structure comprise the single radial cut resonant ring and from two distal points of described single radial cut resonant ring respectively to extended two helixes of ring internal helicoid, described two helixes mutually disjoint and all do not intersect with described single radial cut resonant ring, and described helix is the derived structure of circular helical-line or circular helical-line.
2. super material according to claim 1 is characterized in that, described substrate is made by ceramic material, epoxy resin, polytetrafluoroethylene, FR-4 composite material or F4B composite material.
3. super material according to claim 1 is characterized in that, described helix is wire spiral.
4. super material according to claim 1 is characterized in that, the nested number of turns of described helix is greater than 1.
5. super material according to claim 1 is characterized in that, the live width of described helix is 0.1-0.2mm.
6. super material according to claim 1 is characterized in that, the distance between centers of tracks of described helix is 0.1-0.2mm.
7. super material according to claim 1 is characterized in that, the thickness of described substrate is 0.1-0.5mm.
8. MRI magnetic signal enhance device, it is characterized in that, described MRI magnetic signal enhance device is arranged between the magnetic signal receiving coil of detected part and MRI imaging device, described MRI magnetic signal enhance device comprises shell and the setting super material of at least one deck in the enclosure, and described super material is each described super material of claim 1-8.
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| CN106711617A (en) * | 2017-02-24 | 2017-05-24 | 华南理工大学 | Plane lens for focusing and amplifying near magnetic field through adoption of magnet ring dipole |
| CN110678769A (en) * | 2017-06-07 | 2020-01-10 | 波士顿大学基金会 | Apparatus for improving magnetic resonance imaging |
| CN117148243A (en) * | 2023-11-01 | 2023-12-01 | 天津天达图治科技有限公司 | Magnetic resonance imaging metamaterial and application thereof |
| CN117148242A (en) * | 2023-10-31 | 2023-12-01 | 天津天达图治科技有限公司 | Magnetic field enhancer based on metamaterial, surface coil and decoupling super surface |
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