CN103367922A - Meta-material and MRI magnetic signal enhancement device - Google Patents
Meta-material and MRI magnetic signal enhancement device Download PDFInfo
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- CN103367922A CN103367922A CN2012100930637A CN201210093063A CN103367922A CN 103367922 A CN103367922 A CN 103367922A CN 2012100930637 A CN2012100930637 A CN 2012100930637A CN 201210093063 A CN201210093063 A CN 201210093063A CN 103367922 A CN103367922 A CN 103367922A
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Abstract
The invention provides a meta-material comprising a plurality of meta-material units arranged in an array, wherein each meta-material unit is composed of two substrates and three artificial microstructures, and the substrates and the artificial microstructures are arranged at intervals in a laminated mode, every two neighboring artificial microstructures are connected through a metal through hole, and the artificial microstructures are circular toroids. 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 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 two-layer substrate and three artificial micro-structurals, substrate and artificial micro-structural interval stacked arrangement, adjacent two artificial micro-structurals link to each other by metallic vias, and artificial micro-structural is circular torus.
Preferably, three artificial micro-structurals are followed successively by the first artificial micro-structural, the second artificial micro-structural, the 3rd artificial micro-structural from top to bottom, the outer end points of the first artificial micro-structural links to each other by metallic vias with the outer end points of the second artificial micro-structural, and the interior end points of the second artificial micro-structural links to each other by metallic vias with the interior end points of the 3rd artificial micro-structural.
Preferably, substrate comprises first substrate and second substrate, and first substrate and second substrate are made by ceramic material, epoxy resin, polytetrafluoroethylene, FR-4 composite material or F4B composite material.
Preferably, the thickness of first substrate and second substrate is 0.1-0.5mm.
Preferably, the dielectric constant of first substrate and second substrate is 14-20.
Preferably, the live width of circular torus is 0.1-0.4mm.
Preferably, the distance between centers of tracks of circular torus is 0.1-0.3mm.
Preferably, the line thickness of circular torus is 0.03-0.04mm.
Preferably, the nested number of turns of the first artificial micro-structural, the second artificial micro-structural, the 3rd artificial micro-structural is identical, and the nested number of turns is all greater than 1 circle.
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 super material is the super material with aforementioned feature.
The invention has the beneficial effects as follows: utilize three layers of artificial microstructured layers poststack that connects through the metallic vias of particular design to obtain 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, 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, make MRI imaging device imaging effect better.
Description of drawings
Fig. 1, metamaterial structure schematic diagram of the present invention;
Fig. 2, the super material cell structural representation of the present invention;
Fig. 3, the first artificial micro-structural schematic diagram;
Fig. 4, the second artificial micro-structural schematic diagram;
Fig. 5, the 3rd artificial micro-structural schematic diagram;
Fig. 6, Fig. 2 is along the A-A cross-sectional view;
Fig. 7, magnetic permeability simulated effect schematic diagram of the present invention;
Fig. 8, the first artificial micro-structural polar coordinates schematic diagram;
Fig. 9, MRI magnetic signal enhance device structural representation;
1 surpass material, 10 surpass material cell, 101 first artificial micro-structurals, 102 second artificial micro-structurals, 103 the 3rd artificial micro-structurals, 104 first substrates, 105 second substrates, end points in the 01 first artificial micro-structural, end points in the 02 second artificial micro-structural, the outer end points of 03 second artificial micro-structural, end points in 04 the 3rd artificial micro-structural, 11 metal throuth holes, 12 shells.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
The invention provides a kind of super material, referring to Fig. 1, the super material cell 1 that comprises a plurality of array arrangements, referring to Fig. 2, super material cell 1 is along the A-A cross-sectional view, referring to Fig. 6, super material cell 1 is by first substrate 104, second substrate 105 and the first artificial micro-structural 101, the second artificial micro-structural 102, the 3rd artificial micro-structural 103 interval stacked arrangement.The outer end points 01 of the first artificial micro-structural 101 links to each other by metallic vias 11 with the outer end points 03 of the second artificial micro-structural 102, the interior end points 02 of the second artificial micro-structural 102 links to each other by metallic vias 11 with the interior end points 04 of the 3rd artificial micro-structural 103, such as Fig. 3, Fig. 4, shown in Figure 5.
Be to be understood that, the first artificial micro-structural 101, the second artificial micro-structural 102, the 3rd artificial micro-structural 103, be circular torus, the nested number of turns of circular torus should be greater than 1 circle, the circle of this paper, refer to as shown in Figure 8, any of the ring-shaped inner part that the circular torus of the first artificial micro-structural 101 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, θ) representing, every one 360 degree is a circle, until reach on the circular torus another distal point away from the limit.
Should be appreciated that adjacent two artificial micro-structurals connect by metal throuth hole 11, be equivalent to increase length and the nested number of turns of the artificial micro-structural of super material, further reduce the resonance frequency of super material.
Should be appreciated that circular torus is generally metal wire, for example copper cash, silver-colored line, or even gold thread, also can be conductive plastics sometimes, the live width of circular torus is 0.1-0.4mm, the distance between centers of tracks of circular torus is 0.1-0.3mm, and the line thickness of circular torus is 0.03-0.04mm.
Should be appreciated that 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 first substrate 105 and second substrate 106 are made by ceramic material, epoxy resin, polytetrafluoroethylene, FR-4 composite material or F4B composite material.The thickness of first substrate 105 and second substrate 106 is 0.1-0.5mm, and the dielectric constant of first substrate 105 and second substrate 106 is 14-20.
Be to be understood that, for the electromagnetic wave of characteristic frequency, the size of the artificial micro-structural 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 the first artificial micro-structural 101, the second artificial micro-structural 102, the copper cash live width 0.15mm of the 3rd artificial micro-structural 103, distance between centers of tracks 0.1mm, line thickness 0.035mm, first substrate 104 and second substrate 105 are the FR-4 ceramic substrate, its thickness is 0.2mm, the first artificial micro-structural 101, the second artificial micro-structural 102, the 3rd artificial micro-structural 103 is of a size of 2mm * 2mm, preferred embodiment of the present invention magnetic permeability simulated effect schematic diagram is referring to Fig. 7, as seen from the figure, this super material equals-1 at the 4.12GHz 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. 9, comprise shell 12 and be arranged on the super material 1 of at least one deck in the shell 12, this magnetic signal enhance device is placed between the receiving coil and user of MRI equipment, the first artificial micro-structural 101 in the super material 1, the second artificial micro-structural 102, the 3rd artificial micro-structural 103 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 are in the situation that can carry out various modifications to the present invention not breaking away from the spirit and scope of the present invention after reading present patent application.
Claims (10)
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 two-layer substrate and three artificial micro-structurals, described substrate and described artificial micro-structural interval stacked arrangement, described adjacent two artificial micro-structurals link to each other by metallic vias, and described artificial micro-structural is circular torus.
2. super material according to claim 1, it is characterized in that, described three artificial micro-structurals are followed successively by the first artificial micro-structural, the second artificial micro-structural, the 3rd artificial micro-structural from top to bottom, the outer end points of described the first artificial micro-structural links to each other by metallic vias with the outer end points of described the second artificial micro-structural, and the interior end points of described the second artificial micro-structural links to each other by metallic vias with the interior end points of described the 3rd artificial micro-structural.
3. super material according to claim 1 is characterized in that, described substrate comprises first substrate and second substrate, and described first substrate and second substrate are made by ceramic material, epoxy resin, polytetrafluoroethylene, FR-4 composite material or F4B composite material.
4. super material according to claim 3 is characterized in that, the thickness of described first substrate and second substrate is 0.1-0.5mm.
5. super material according to claim 3 is characterized in that, the dielectric constant of described first substrate and second substrate is 14-20.
6. super material according to claim 1 is characterized in that, the live width of described circular torus is 0.1-0.4mm.
7. super material according to claim 1 is characterized in that, the distance between centers of tracks of described circular torus is 0.1-0.3mm.
8. super material according to claim 1 is characterized in that, the line thickness of described circular torus is 0.03-0.04mm.
9. super material according to claim 1 is characterized in that, the nested number of turns of the described first artificial micro-structural, the second artificial micro-structural, the 3rd artificial micro-structural is identical, and the nested number of turns is all greater than 1 circle.
10. 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 1-9.
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Citations (2)
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| CN101740862A (en) * | 2008-11-20 | 2010-06-16 | 东莞市启汉电子科技有限公司 | Dipole antenna of RF chip |
| US20110204891A1 (en) * | 2009-06-25 | 2011-08-25 | Lockheed Martin Corporation | Direct magnetic imaging apparatus and method |
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Patent Citations (2)
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|---|---|---|---|---|
| CN101740862A (en) * | 2008-11-20 | 2010-06-16 | 东莞市启汉电子科技有限公司 | Dipole antenna of RF chip |
| US20110204891A1 (en) * | 2009-06-25 | 2011-08-25 | Lockheed Martin Corporation | Direct magnetic imaging apparatus and method |
Non-Patent Citations (3)
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| F. AZNAR 等: ""Metamaterial transmission lines based on broad-side coupled spiral resonators"", 《ELECTRONICS LETTERS》 * |
| LEE C. K. 等: ""Multilayer Stacked Coreless Printed Spiral Winding Inductor with Wide Frequency Bandwidth"", 《ENERGY CONVERSION CONGRESS AND EXPOSITION, 2009. ECCE 2009. IEEE》 * |
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Effective date of registration: 20210518 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. |
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