CN102709706A - MRI (Magnetic Resonance Imaging) magnetic signal enhancing device - Google Patents
MRI (Magnetic Resonance Imaging) magnetic signal enhancing device Download PDFInfo
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- CN102709706A CN102709706A CN2012101330584A CN201210133058A CN102709706A CN 102709706 A CN102709706 A CN 102709706A CN 2012101330584 A CN2012101330584 A CN 2012101330584A CN 201210133058 A CN201210133058 A CN 201210133058A CN 102709706 A CN102709706 A CN 102709706A
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Abstract
The invention provides an MRI (Magnetic Resonance Imaging) magnetic signal enhancing device. The MRI magnetic signal enhancing device comprises a shell and three negative magnetic conductivity meta-material plates arranged in the shell, wherein an right angle is formed between the adjacent two negative magnetic conductivity meta-material plates; each negative magnetic conductivity meta-material plate comprises a substrate and a plurality of artificial microstructures which are periodically arrayed on the substrate; and an arch-shaped structure is formed by the three negative magnetic conductivity meta-material plates and a to-be-tested part is placed in the arch-shaped structure. According to the MRI magnetic signal enhancing device, the capability that MRI imaging equipment receives the magnetic signal of the to-be-tested part fed back by a coil can be greatly enhanced, and the imaging quality of the MRI imaging equipment is improved under the condition that the MRI imaging equipment is not replaced, so that the MRI magnetic signal enhancing device has a good application and development prospect.
Description
Technical field
The present invention relates to MRI medical imaging field, relate to a kind of MRI magnetic signal enhance device particularly.
Background technology
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 as receiving coil sometimes.Under the help of radio wave pulses energy, the Magnetic resonance imaging scanner can the position patient body in a very little point, confirm 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.The system pilot pulse is aimed at the body region that institute will check, and causes this regional proton to absorb they are rotated or the required energy of precession with different directions.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) under CF, to be rotated according to specific direction.The CF 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 will form images 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.The definition and the main field strength of MRI imaging device are proportionate, and the main magnetic field magnet system is the major part of MRI imaging device, in order to promote the image quality of MRI imaging system, generally need to change whole MRI imaging device, and cost is very high.Receiving coil is according to the difference of structure and inspection purpose; Can be divided into quadrature head coil, quadrature body coil, special-purpose coil etc. in quadrature knee, ankle-joint coil, neck associating phased-array coil, body phased-array coil, full backbone phased-array coil, soft surface coil and mammary gland, the rectum, in the uterine cavity.The quality of MRI picture quality is except that relevant with hardware such as magnet type, intensity, gradient system, radio system and imaging, image processing software, and the selection of scanning technique, pulse train and sweep parameter all has very big influence to the MRI image.According to statistics, identical MRI hardware device, unreasonable if scanning technique is used, its clinical diagnosis coincidence rate only reaches 63%, and visible MRI scanning technique is to the importance of MRI imaging, and wherein selection and the rational Application to radio-frequency coil is most important especially.The coil array that phased-array coil is made up of 2 above coils or coil unit, each coil can receive the magnetic resonance signal of corresponding region simultaneously, and the signal of each zonule is organically linked together.
Ultra material is meant artificial composite structure or the composite material that some have the not available extraordinary physical property of natural material.Structurally ordered design through 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.The character of ultra material and function mainly come from its inner structure but not constitute their material.At present; The geometry of the artificial micro-structural of existing metal is the perhaps open annular of similar " recessed " font as shown in Figure 1 of " worker " font; But this structure all can not realize magnetic permeability μ and be significantly less than 0 or ultra material resonances frequency is reduced, and can not realize isotropism, has only the artificial micro-structural of metal that has the special geometric figure through design; Could make this artificial electromagnetic material in special frequency, reach magnetic permeability μ value, and have lower resonance frequency less than 0.
At present, international community is to the existing a large amount of research in magnetic permeability aspect, and wherein the research for positive magnetic permeability has been tending towards ripe; Research for the ultra material of negative magnetoconductivity is the focus of studying both at home and abroad now, and negative magnetoconductivity has the quantum polarization, can produce polarization to incident wave; Therefore sphere of action is very big, and like the mr imaging technique in the medical imaging field, negative magnetic-inductive capacity material can be strengthened electromagnetic imaging effect; Negative magnetic-inductive capacity material is also playing an important role aspect the lens research in addition; In the engineering field, magnetic permeability all is meant relative permeability usually, is the absolute permeability μ and the magnetic constant μ of material
0The ratio of (claiming permeability of vacuum again), μ
r=μ/μ
0, dimensionless number.Usually " relatively " two words and symbol subscript r are removed.Magnetic permeability is to represent that material receives 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 finding of nature, μ is generally greater than 0.
Summary of the invention
Technical problem to be solved by this invention is: the present invention is the ability of Contrast-enhanced MRI imaging device receiving coil feedback detected part magnetic signal greatly, improves the image quality of MRI imaging device.
The present invention for realizing the technical scheme that goal of the invention adopts is: a kind of MRI magnetic signal enhance device is provided; This MRI magnetic signal enhance device comprises shell and three ultra plate of material of negative magnetoconductivity in the enclosure is set; Adjacent two ultra plate of material of negative magnetoconductivity are rectangular; The ultra plate of material of negative magnetoconductivity comprises that substrate and a plurality of cyclic array are arranged in the artificial micro-structural on the substrate, and three ultra plate of material of negative magnetoconductivity constitute domes, and detected part places in the domes.
Preferably, the volume of domes is greater than the volume of detected part.
Preferably, substrate is divided into a plurality of identical cube base board units, is attached with an artificial micro-structural on each cube base board unit.
Preferably, the length of side of cube base board unit is 1/10th of an electromagnetic wavelength.
Preferably, the cube base board unit is along the vertical x of pairwise orthogonal, y, three direction array arrangements of z.
Preferably, artificial micro-structural is split ring resonator structure and derived structure thereof.
Preferably, artificial micro-structural is silver-colored line.
Preferably, artificial micro-structural is a copper cash.
The invention has the beneficial effects as follows: be built into the MRI magnetic signal enhance device that contains domes through the ultra plate of material of particular design negative magnetoconductivity three; Detected part is placed domes; Utilize the magnetic permeability of the ultra plate of material of negative magnetoconductivity to be negative this characteristic; The ability of the receiving coil feedback detected part magnetic signal of Contrast-enhanced MRI imaging device, thereby the image quality of raising MRI imaging device.
Description of drawings
Fig. 1, structural representation of the present invention;
Fig. 2, negative magnetoconductivity metamaterial structure sketch map of the present invention;
Fig. 3, cube base board unit sketch map of the present invention;
Fig. 4, the present invention's second artificial micro-structural sketch map;
Fig. 5, third party of the present invention makes the micro-structural sketch map;
Fig. 6, the present invention's four-player is made the micro-structural sketch map;
Among the figure, 101 shells, the ultra plate of material of 102 negative magnetoconductivities, 103 domes, 10 cube base board units, 11 first artificial micro-structurals, 12 second artificial micro-structurals, 13 third parties make micro-structural, and 14 four-players are made micro-structural.
Embodiment
Fig. 1 is a structural representation of the present invention, comprises that the ultra plate of material 102 of shell 101 and 102, three identical negative magnetoconductivities of the ultra plate of material of shell 101 inner negative magnetoconductivities embeds in the shell 101.
Fig. 2 is the ultra plate of material structural representation of negative magnetoconductivity of the present invention; Adjacent two ultra plate of material of negative magnetoconductivity are rectangular; The ultra plate of material 102 of negative magnetoconductivity comprises that substrate and a plurality of cyclic array are arranged in the artificial micro-structural on the substrate, and the ultra plate of material 102 of negative magnetoconductivity comprises domes 103, and detected part places in the domes 103; Domes 103 volumes should be greater than detected part, and promptly domes 103 should coat detected part fully.
Fig. 3 is cube base board unit 10 structural representations of the present invention; Substrate of the present invention can " be divided " and be a plurality of identical cube base board units 10; Be attached with an artificial micro-structural on each cube base board unit 10, the first artificial micro-structural 11 is the derived structure of split ring resonator structure among Fig. 3.Cube base board unit 10 is along the vertical x of pairwise orthogonal, y, three direction array arrangements of z; The length of side of cube base board unit 10 is 1/10th of an electromagnetic wavelength; For example operational environment is that wavelength is the electromagnetic wave of λ; Needing ultra material be to present negative magnetoconductivity to this electromagnetic electromagnetic property, preferably above-mentioned line space, column pitch is made as 1/10th wavelength when then designing artificial micro-structural, i.e. h=λ/10.
Be to be understood that; The artificial micro-structural of the present invention can also be selected the second artificial micro-structural 12 for example shown in Figure 4; Third party shown in Figure 5 makes the derived structure of micro-structural 13 structures such as split ring resonator such as grade; Same, can also select the artificial micro-structural of split ring resonator shown in Figure 6, above structure is found all can realize that the magnetic permeability of ultra material is-1 through emulation.The artificial micro-structural of the present invention is copper cash, silver-colored line, also can be the alloy of copper and other metals, or even gold thread.The distance between centers of tracks d that walks of artificial micro-structural equates that the d minimum can be accomplished 0.1mm.
Should be appreciated that according to actual needs, increase or reduce the winding turns of artificial micro-structural, can regulate the resonance frequency of the ultra plate of material 102 of negative magnetoconductivity, artificial micro-structural winding turns is many more, and the resonance frequency of the ultra plate of material 102 of negative magnetoconductivity is low more.
Be to be understood that; It is that-1 o'clock the resonance frequency and the resonance frequency of MRI imaging device are similar to that the present invention utilizes the ultra plate of material magnetic permeability of negative magnetoconductivity; The ultra plate of material of negative magnetoconductivity that to pass through particular design is built into MRI magnetic signal enhance device; Make it to form domes, detected part is placed in these domes, the ability of Contrast-enhanced MRI imaging device receiving coil feedback detected part magnetic signal; Improve the image quality of MRI imaging device, MRI magnetic signal enhance device of the present invention has vast potential for future development.
The foregoing description 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 under the situation that does not break away from the spirit and scope of the present invention after reading present patent application.
Claims (8)
1. MRI magnetic signal enhance device; It is characterized in that; Said MRI magnetic signal enhance device comprises shell and setting three ultra plate of material of negative magnetoconductivity in the enclosure, and said adjacent two ultra plate of material of negative magnetoconductivity are rectangular, and the ultra plate of material of said negative magnetoconductivity comprises that substrate and a plurality of cyclic array are arranged in the artificial micro-structural on the substrate; Said three ultra plate of material of negative magnetoconductivity constitute domes, and detected part places in the said domes.
2. MRI magnetic signal enhance device according to claim 1 is characterized in that the volume of said domes is greater than the volume of said detected part.
3. MRI magnetic signal enhance device according to claim 1 is characterized in that, said substrate is divided into a plurality of identical cube base board units, is attached with an artificial micro-structural on each said cube base board unit.
4. MRI magnetic signal enhance device according to claim 1 is characterized in that the length of side of said cube base board unit is 1/10th of an electromagnetic wavelength.
5. MRI magnetic signal enhance device according to claim 1 is characterized in that, said cube base board unit is along the vertical x of pairwise orthogonal, y, three direction array arrangements of z.
6. MRI magnetic signal enhance device according to claim 1 is characterized in that said artificial micro-structural is split ring resonator structure and derived structure thereof.
7. MRI magnetic signal enhance device according to claim 1 is characterized in that said artificial micro-structural is silver-colored line.
8. MRI magnetic signal enhance device according to claim 1 is characterized in that said artificial micro-structural is a copper cash.
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| CN2012101330584A CN102709706A (en) | 2012-04-28 | 2012-04-28 | MRI (Magnetic Resonance Imaging) magnetic signal enhancing device |
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| CN2012101330584A CN102709706A (en) | 2012-04-28 | 2012-04-28 | MRI (Magnetic Resonance Imaging) magnetic signal enhancing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409865A (en) * | 2014-11-27 | 2015-03-11 | 骆柳春 | MRI magnetic signal enhancing component |
| RU2776600C1 (en) * | 2021-08-20 | 2022-07-22 | федеральное государственное автономное образовательное учреждение высшего образования «Национальный исследовательский университет ИТМО» (Университет ИТМО) | Method for functioning of a magnetic resonance tomograph based on a metasurface (variants) |
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| WO2002003500A1 (en) * | 2000-06-21 | 2002-01-10 | Marconi Optical Components Limited | Material having magnetic permeability at r.f. frequency |
| US20110204891A1 (en) * | 2009-06-25 | 2011-08-25 | Lockheed Martin Corporation | Direct magnetic imaging apparatus and method |
| CN102349831A (en) * | 2011-09-08 | 2012-02-15 | 浙江大学 | Superlens based on artificial electromagnetic structure in nuclear magnetic resonance imaging |
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2012
- 2012-04-28 CN CN2012101330584A patent/CN102709706A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002003500A1 (en) * | 2000-06-21 | 2002-01-10 | Marconi Optical Components Limited | Material having magnetic permeability at r.f. frequency |
| US20110204891A1 (en) * | 2009-06-25 | 2011-08-25 | Lockheed Martin Corporation | Direct magnetic imaging apparatus and method |
| CN102349831A (en) * | 2011-09-08 | 2012-02-15 | 浙江大学 | Superlens based on artificial electromagnetic structure in nuclear magnetic resonance imaging |
Non-Patent Citations (3)
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| JUAN D.BAENA等: "Artificial magnetic metamaterial design by using spiral resonators", 《PHYSICAL REVIEW》 * |
| Y.XIE,J.JIANG,S.HE: "Proposal of cylindrical rolled-up metamaterial lenses for magnetic resonance imaging application and preliminary experimental demonstration", 《PROGRESS IN ELECTROMAGNETICS RESEARCH》 * |
| 张富利: "结构单元与左手材料性能关系研究", 《西北工业大学硕士学位论文》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409865A (en) * | 2014-11-27 | 2015-03-11 | 骆柳春 | MRI magnetic signal enhancing component |
| RU2776600C1 (en) * | 2021-08-20 | 2022-07-22 | федеральное государственное автономное образовательное учреждение высшего образования «Национальный исследовательский университет ИТМО» (Университет ИТМО) | Method for functioning of a magnetic resonance tomograph based on a metasurface (variants) |
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Application publication date: 20121003 |