CN104409863A - MRI magnetic signal enhancing device - Google Patents
MRI magnetic signal enhancing device Download PDFInfo
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- CN104409863A CN104409863A CN201410697576.8A CN201410697576A CN104409863A CN 104409863 A CN104409863 A CN 104409863A CN 201410697576 A CN201410697576 A CN 201410697576A CN 104409863 A CN104409863 A CN 104409863A
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Abstract
The invention discloses an MRI magnetic signal enhancing device comprising a housing and meta material arranged in the housing. The meta material comprises a substrate and an artificial micro structure layer fixed to the substrate; the artificial micro structure layer comprises multiple artificial micro structures arranged in periodic arrays; each artificial micro structure comprises four same artificial micro structure units, and an optional artificial micro structure unit can be overlapped with the other three artificial micro structure units after rotating by 90 degrees, 180 degrees and 270 degrees around one rotary shaft; the artificial micro structure unit comprises a first spiral metal wire and a second spiral metal wire in the same length, the second spiral metal wire is embedded in the first spiral metal wire at equal intervals, and the first spiral metal wire is overlapped with the second spiral metal wire after rotating by 90 degrees on the plane of the artificial micro structure layer. By the aid of the device, the feature, that the permeability is negative, of the meta material with negative permeability is utilized, and the effect of enhancing received signals is achieved.
Description
Technical field
The present invention relates to electromagnetic technology field, particularly relate to a kind of MRI magnetic signal intensifier.
Background technology
Nulcear magnetic resonance (NMR) (MRI, Magnetic Resonance Imaging) principle of imaging system is the radio wave pulses energy utilizing coil to go to detect nuclear spin to absorb and launch, this coil, as receiving coil, is being gone back simultaneously as transmitting coil sometimes.Under the help of radio wave pulses energy, Magnetic resonance imaging scanner can a very little point in position patient body, then determines that this is the tissue of which kind of type.Magnetic resonance imaging machine device adopts the radio frequency pulse specific to hydrogen atom.The body region that will check is aimed in System guides pulse, and causes the proton uptake in this region to make them with the energy needed for different directions rotation or precession.This is NMR imaging device " resonance " part.Unnecessary a pair or two unmatched proton being rotated according to specific direction under characteristic frequency in radio frequency pulse forces them each 1,000,000 proton.The characteristic frequency causing resonance is called as Rameau that frequency, and this value draws according to wanting the magnetic field intensity of the particular organization of imaging and main field to calculate.Radio frequency pulse utilizes a coil to provide usually, and this coil is called transmitting coil.The receiving coil of existing magnetic resonance imaging device must quite near-earth close to detected part, to obtain the magnetic signal discharged by detected part.Definition and the main field strength of MRI imaging device are proportionate, and main magnetic field magnet system is the major part of MRI imaging device, and in order to promote the image quality of MRI imaging system, generally need to change whole MRI imaging device, cost is very high.
Meta Materials refers to some artificial composite structures with the extraordinary physical property not available for natural material or composite material.By the structurally ordered design on the key physical yardstick of material, the restriction of some apparent natural law can be broken through, thus obtain the meta-materials function exceeding the intrinsic common character of nature.The character of Meta Materials and function mainly come from the structure of its inside but not form their material.At present, the geometry of existing metal man-made microstructure be " work " font or the open annular of similar " recessed " font, but this structure all can not realize magnetic permeability μ and be significantly less than 0 or make meta-material resonant frequency reduce, isotropism can not be realized, only has the metal man-made microstructure by design with special geometric figure, just can make this artificial electromagnetic material in special frequency channel, reach magnetic permeability μ value and be less than 0, and there is lower resonance frequency.
At present, international community has large quantifier elimination to magnetic permeability aspect, research wherein for positive magnetic permeability has been tending towards ripe, research for negative-magnetic-permeability meta-material is the focus of research both at home and abroad now, negative magnetoconductivity has quantum polarization, polarization can be produced to incident wave, therefore sphere of action is very large, as the mr imaging technique in medical imaging field, negative magnetic-inductive capacity material can strengthen electromagnetic imaging effect, negative magnetic-inductive capacity material also plays an important role in lens research in addition, at engineering field, magnetic permeability all refers to relative permeability usually, for the absolute permeability μ of material and the ratio of magnetic constant μ 0, μ r=μ/μ 0, dimensionless number.Usually " relatively " two word and symbol subscript r be all removed.Magnetic permeability is when representing that material is subject to magnetizing field H effect, the increase (μ > 1) of inner true magnetic field relative to H or the degree of minimizing (μ < 1).So far, in the already present material of the nature found, μ is generally greater than 0.
Summary of the invention
The embodiment of the present invention provides a kind of MRI magnetic signal intensifier, adopt the Meta Materials of multiple man-made microstructure with cyclic array arrangement, utilize the magnetic permeability of negative-magnetic-permeability meta-material for this characteristic negative, reach the effect that signal strengthens, and then the image quality of Contrast-enhanced MRI system.
The embodiment of the present invention provides a kind of MRI magnetic signal intensifier, it is characterized in that, comprising: shell and the Meta Materials arranged in the enclosure;
Described Meta Materials comprises substrate and is fixed on the man-made microstructure layer on substrate, and described man-made microstructure layer comprises multiple man-made microstructure of cyclic array arrangement;
Described man-made microstructure comprises four identical man-made microstructure unit, and described arbitrary man-made microstructure unit overlaps with other three artificial microstructure units respectively around same rotating shaft half-twist, after 180 °, 270 °;
Described man-made microstructure unit comprises the first helical wire and the second helical wire, the first helical wire that length is equal is equidistantly nested with the second helical wire, and described first helical wire overlaps with the second helical wire after half-twist in the plane at man-made microstructure layer place.
Further, described Meta Materials comprises two-layer described substrate and three layers of described man-made microstructure layer, two-layer described substrate and three layers of described man-made microstructure layer alternate stacked.
Further, the position one_to_one corresponding of described man-made microstructure unit; Described man-made microstructure unit opening direction is, the opening direction of two outer man-made microstructure unit is identical, and intermediate layer man-made microstructure unit is contrary with the opening direction of outer man-made microstructure unit.
Further, described substrate is FR-4 organic polymer substrate or ceramic substrate.
Further again, the thickness of described substrate is 0.10-0.30mm.
A kind of MRI magnetic signal intensifier that the embodiment of the present invention provides, utilize the magnetic permeability of negative-magnetic-permeability meta-material for this characteristic negative, reach the effect that signal strengthens, make MRI imaging device imaging effect better, simultaneously, MRI equipment image quality strengthens, and MRI equipment receiving coil can be made near detected part, need not can to reach the effect of imaging.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of MRI magnetic signal intensifier provided by the invention;
Fig. 2 is the structural representation of the Meta Materials of the embodiment of MRI magnetic signal intensifier provided by the invention;
Fig. 3 is the schematic diagram of the man-made microstructure layer of the embodiment of MRI magnetic signal intensifier provided by the invention;
Fig. 4 is the schematic diagram of the man-made microstructure of the embodiment of MRI magnetic signal intensifier provided by the invention;
Fig. 5 is the schematic diagram of the man-made microstructure unit of the embodiment of MRI magnetic signal intensifier provided by the invention;
Fig. 6 is the simulated effect schematic diagram of the embodiment of MRI magnetic signal intensifier provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 1-5, the structure of the embodiment of MRI magnetic signal intensifier provided by the invention is described in detail.
See Fig. 1, it is the structural representation of the embodiment of MRI magnetic signal intensifier provided by the invention.
The Meta Materials 10 that described MRI magnetic signal intensifier comprises shell 12 and arranges in the enclosure; Shell 12 plays a part to support, protect internal layer negative-magnetic-permeability meta-material 10, at some privileged sites of measurement, during as leg, neck, can carry out conformal design, be convenient to user and use according to specific needs shell 12.If there is two-layer above negative-magnetic-permeability meta-material 10 shell 12 inside, can be coaxial parallel fixing by it.
See Fig. 2, it is the structural representation of the Meta Materials of the embodiment of MRI magnetic signal intensifier provided by the invention;
Described Meta Materials 10 comprises substrate d, substrate e, man-made microstructure layer a, man-made microstructure layer b and man-made microstructure layer c, and man-made microstructure layer a, man-made microstructure layer b and man-made microstructure layer c are separately fixed on corresponding substrate.Substrate d, substrate e and man-made microstructure layer a, man-made microstructure layer b, man-made microstructure layer c are alternate stacked.
In the middle of concrete enforcement, substrate d, e are FR-4 organic polymer substrate or ceramic substrate, and the thickness of substrate d, e is 0.10-0.30mm.
See Fig. 3, it is the schematic diagram of the man-made microstructure layer of the embodiment of MRI magnetic signal intensifier provided by the invention;
Described man-made microstructure layer a, b, c comprise multiple man-made microstructure 2 of cyclic array arrangement respectively, and described multiple man-made microstructure 2 is fixed on the surface of substrate d and substrate e, form man-made microstructure layer a, man-made microstructure layer b and man-made microstructure layer c.
The arrangement of described cyclic array, namely with x direction be row, with perpendicular to the y direction in x direction be row arrange, and each line space, each column pitch are equal respectively, and line space equals column pitch.
Preferably, line space, column pitch are not more than 1/4th of the wavelength of the incident electromagnetic wave that will respond, the i.e. electromagnetic wave of such as operational environment to be wavelength be λ, need Meta Materials to be present negative magnetoconductivity to this electromagnetic electromagnetic property, then when designing man-made microstructure, above-mentioned line space, column pitch are selected to be not more than quarter-wave.
See Fig. 4, it is the schematic diagram of the man-made microstructure of the embodiment of MRI magnetic signal intensifier provided by the invention;
Described man-made microstructure comprises four identical man-made microstructure unit, and described arbitrary man-made microstructure unit overlaps with other three artificial microstructure units respectively around same rotating shaft half-twist, after 180 °, 270 °; Equidistantly array arrangement is surperficial at substrate d, e ringwise for four artificial microstructure units.
See Fig. 5, it is the man-made microstructure cell schematics of the embodiment of MRI magnetic signal intensifier provided by the invention;
Described man-made microstructure unit comprises the first helical wire and the second helical wire, the first helical wire that length is equal is equidistantly nested with the second helical wire, and described first helical wire overlaps with the second helical wire after half-twist in the plane at man-made microstructure layer place.
1 is the opening part of artificial microstructure unit, and its opening direction upwards.
The position one_to_one corresponding of described man-made microstructure unit; Man-made microstructure layer a is identical with the opening direction of the man-made microstructure unit of man-made microstructure layer c, and the man-made microstructure unit of man-made microstructure layer b is contrary with the opening direction of the man-made microstructure unit of man-made microstructure layer a and man-made microstructure layer c.
In the middle of concrete enforcement, described metal wire material can be copper cash, silver-colored line or gold thread.
See Fig. 6, the simulated effect schematic diagram of the embodiment of MRI magnetic signal intensifier provided by the invention;
Simulation parameter is: copper cash selected by metal wire, and copper cash live width 0.1mm, copper cash thickness 0.018mm, substrate is FR-4 epoxy resin base plate, thickness 0.018mm, man-made microstructure size 30mm × 30mm.From simulation result, negative-magnetic-permeability meta-material of the present invention realize magnetic permeability be the resonance frequency of-1 at below 10MHz, compared with prior art, greatly reduce the resonance frequency of negative-magnetic-permeability meta-material.
A kind of MRI magnetic signal intensifier that the embodiment of the present invention provides, adopt the Meta Materials of multiple man-made microstructure with cyclic array arrangement, described man-made microstructure comprises four identical man-made microstructure unit, described man-made microstructure unit is a rectangular coil metal broken line, and described broken line is for forming from any outside equidistantly spiral.This magnetic signal intensifier is placed between MRI equipment receiving coil and user, and the Meta Materials in MRI magnetic signal intensifier and MRI equipment receiving coil produce and respond, and strengthens the magnetic signal of receiving coil, and then the image quality of Contrast-enhanced MRI system.After adding MRI magnetic signal intensifier, the image of MRI equipment is more more clear, bright.Meanwhile, the image quality of Contrast-enhanced MRI system, can make MRI equipment receiving coil near detected part, need not can reach the effect of imaging.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (5)
1. a MRI magnetic signal intensifier, is characterized in that, comprising: shell and the Meta Materials arranged in the enclosure;
Described Meta Materials comprises substrate and is fixed on the man-made microstructure layer on substrate, and described man-made microstructure layer comprises multiple man-made microstructure of cyclic array arrangement;
Described man-made microstructure comprises four identical man-made microstructure unit, and described arbitrary man-made microstructure unit overlaps with other three artificial microstructure units respectively around same rotating shaft half-twist, after 180 °, 270 °;
Described man-made microstructure unit comprises the first helical wire and the second helical wire, the first helical wire that length is equal is equidistantly nested with the second helical wire, and described first helical wire overlaps with the second helical wire after half-twist in the plane at man-made microstructure layer place.
2. MRI magnetic signal intensifier as claimed in claim 1, is characterized in that: described Meta Materials comprises two-layer described substrate and three layers of described man-made microstructure layer, two-layer described substrate and three layers of described man-made microstructure layer alternate stacked.
3. MRI magnetic signal intensifier as claimed in claim 1, is characterized in that: the position one_to_one corresponding of described man-made microstructure unit; Described man-made microstructure unit opening direction is, the opening direction of two outer man-made microstructure unit is identical, and intermediate layer man-made microstructure unit is contrary with the opening direction of outer man-made microstructure unit.
4. MRI magnetic signal intensifier as claimed in claim 1, is characterized in that: described substrate is FR-4 organic polymer substrate or ceramic substrate.
5. MRI magnetic signal intensifier as claimed in claim 1, is characterized in that: the thickness of described substrate is 0.10-0.30mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410697576.8A CN104409863A (en) | 2014-11-27 | 2014-11-27 | MRI magnetic signal enhancing device |
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| CN201410697576.8A CN104409863A (en) | 2014-11-27 | 2014-11-27 | MRI magnetic signal enhancing device |
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| CN104409863A true CN104409863A (en) | 2015-03-11 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709704A (en) * | 2012-04-27 | 2012-10-03 | 深圳光启创新技术有限公司 | MRI (magnetic resonance imaging) magnetic signal enhancement device |
| CN102709705A (en) * | 2012-04-27 | 2012-10-03 | 深圳光启创新技术有限公司 | MRI (magnetic resonance imaging) magnetic signal enhancement device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709704A (en) * | 2012-04-27 | 2012-10-03 | 深圳光启创新技术有限公司 | MRI (magnetic resonance imaging) magnetic signal enhancement device |
| CN102709705A (en) * | 2012-04-27 | 2012-10-03 | 深圳光启创新技术有限公司 | MRI (magnetic resonance imaging) magnetic signal enhancement device |
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