CN102694272A - MRI(Magnetic Resonance Imaging) signal enhancement device - Google Patents
MRI(Magnetic Resonance Imaging) signal enhancement device Download PDFInfo
- Publication number
- CN102694272A CN102694272A CN2012101330550A CN201210133055A CN102694272A CN 102694272 A CN102694272 A CN 102694272A CN 2012101330550 A CN2012101330550 A CN 2012101330550A CN 201210133055 A CN201210133055 A CN 201210133055A CN 102694272 A CN102694272 A CN 102694272A
- Authority
- CN
- China
- Prior art keywords
- magnetic signal
- mri
- mri magnetic
- enhance device
- ultra material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention provides an attached MRI signal enhancement device. On one hand, the MRI signal enhancement device can enhance MRI magnetic signals to improve the MRI imaging effect, and on the other hand, the MRI signal enhancement device, as a passive device, has the beneficial effects of safety, reliability and convenience in use.
Description
[technical field]
The present invention relates to the MRI technical field of imaging.
[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.This point possibly be that a length of side has only half millimeter cube.MRI system can carry out point by point scanning to patient body, thereby makes up the two dimension or the graphics of types of organization.Afterwards, it is information integrated to together with all, creates a two dimensional image or threedimensional model.Maximum in the MRI system, the while also is that most important parts are exactly magnet.Magnet in the MRI system adopts the unit of tesla by name to weigh.The magnetic field intensity of the magnet that nowadays uses in the Magnetic resonance imaging equipment is between 0.5 to 2.0 tesla (or 5,000 to 20,000 Gausses).Another kind of magnet is all arranged in each MRI system, be called gradient magnet.Three gradient magnets are arranged in the magnetic resonance imaging machine device.Main magnet is in stable, the high-intensity magnetic field patient, is a variable magnetic field and gradient magnet produces.The remainder of MRI system comprise one very powerful calculating machine system, some are transmitted into equipment and many other accessory patient body in scanner following time with RF (radio frequency) pulse in patient lies.Thorax tube at scanner is inner, and the center of placement patient's pipeline is directly passed through in magnetic field.This means that if the patient lies on the back the proton of the hydrogen atom in its body will be arranged along foot or cephalad direction in scanner.The overwhelming majority in these protons can be compensated for each other---that is to say along the proton that the foot direction is arranged, all can have another proton to arrange and compensate for it towards cephalad direction for each.In each 1,000,000 proton, have only and severally can not compensate for each other.This sounds and seldom, still only the interior hydrogen atom number of body just is enough to depict high-quality image.
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 (this generation coil also is the magnetic signal receiving coil simultaneously usually).The magnetic resonance imaging machine device is furnished with different types of coil to the different parts of health: knee, shoulder, wrist, head, neck or the like.These coils meet the profile of the body part of accepting to form images usually, perhaps at least during checking with the close at these positions.Approximately at one time, three gradient magnets are started working.When opening and closing gradient magnet rapidly with certain particular form, their permutation and combination in main magnet make it in minimum subrange, change main field.This means we can accurately select the zone that will form images, in Magnetic resonance imaging, be referred to as " section ".Imagine that every piece of bread that has only several millimeters thick---the section in the Magnetic resonance imaging also can reach such precision.We can in any direction carry out " section " to any position of health, make Magnetic resonance imaging have more advantage than other imaging techniques.This also means to need not to move makes machine obtain from another direction that image---machine can utilize gradient magnet to accomplish various work.
When closing radio frequency pulse, their natural arrangement positions in magnetic field are returned in the proton of hydrogen atom motion beginning slowly (comparatively speaking), and discharge the additional energy of being stored.In this process, they can discharge a signal, and coil can be caught this signal and sent to computer system then.What system received is that these data form the figure that can be put on the film through Fourier transform through the mathematics data of conversion." imaging " part of Here it is MRI system.
The deficiency of existing Magnetic resonance imaging equipment is: the necessary quite near-earth of receiving coil is near detected part; To obtain the magnetic signal that discharges by detected part; Make troubles on the one hand the design of receiving coil; Need to design different types of receiving coil, on the other hand, increased the manufacturing cost of equipment to the different parts of health.
Existing Magnetic resonance imaging equipment is according to the difference of field intensity; Be divided into low-field nuclear magnetic resonance imaging device less than 1T, the midfield Magnetic resonance imaging equipment of 1.5T and 3.0T or above high-field nuclear magnetic resonance imaging device, field intensity is high more; Its manufacturing cost is high more, and imaging effect is also good more.At present domestic middle-size and small-size medical institutions are because fund, employing be the low-field nuclear magnetic resonance imaging device, the MRI imaging effect of equipment in urgent need to be improved obtains more accurate and detailed diagnostic message.
[summary of the invention]
Technical problem to be solved by this invention improves the MRI imaging effect under the situation that does not change existing MRI equipment, guarantee the equipment safety in utilization simultaneously.
The present invention realizes that the technical scheme that goal of the invention adopts is; A kind of MRI magnetic signal enhance device; Be arranged between detected part and the MRI magnetic signal receiving coil in order to the Contrast-enhanced MRI magnetic signal; Said MRI magnetic signal enhance device comprises that package casing and ultra material are dull and stereotyped, the said ultra material flat board ultra material of the ultra material layer composition of one deck at least of serving as reasons, and said ultra material has negative magnetoconductivity under MRI magnetic signal operating frequency; Said ultra material flat board vertically is fixed in the said package casing, said package casing comprise with surpass the dull and stereotyped housing department that cooperates of material with the vertical pedestal part in said housing department plane.
Preferably, be provided with balancing weight in the said pedestal part.
Preferably, the junction of said housing department and said pedestal part is designed to fillet.
Preferably, said housing department is the square plate structure.
Preferably, said housing department is two zones with said base portion, and the area in said two zones is unequal.
Preferably, in two zones of said pedestal part, the part that area is big is trapezoidal, and the part that area is little is concave shape.
Preferably, said package casing is the PVC material.
Particularly, said ultra material layer is made up of medium basic unit and artificial microstructured layers, and said medium basic unit is a dielectric material, and said artificial microstructured layers is an electric conducting material, and said artificial microstructured layers is formed by a plurality of magnetic micro-structure array arrangements.
Particularly, said medium basic unit is the epoxy resin fiberglass substrate, and said artificial microstructured layers is a metallic copper material.
Particularly, said magnetic micro-structure is that spiral shell gets around the choma structure, and the magnetic permeability of said ultra material is-1.
The present invention provides a kind of MRI magnetic signal enhance device of accessories type, and ability Contrast-enhanced MRI magnetic signal improves the MRI imaging effect on the one hand, on the other hand, as a kind of passive device, has beneficial effect safe and reliable, easy to use.
[description of drawings]
Fig. 1, the structure chart of MRI magnetic signal enhance device.
Fig. 2, the outside drawing of MRI magnetic signal enhance device.
Fig. 3, the structure chart of ultra material.
Fig. 4, square spiral shell gets around the choma structure chart.
Fig. 5, the characteristic curve diagram of ultra material resonances frequency.
[embodiment]
Below in conjunction with accompanying drawing and embodiment the present invention is elaborated.
A kind of MRI magnetic signal enhance device; Be arranged between detected part and the MRI magnetic signal receiving coil in order to the Contrast-enhanced MRI magnetic signal; The structure chart of MRI magnetic signal enhance device comprises package casing 1 and ultra material 2 referring to accompanying drawing 1, and package casing 1 comprises the housing department 11 and the pedestal part 12 vertical with the housing department plane that cooperates with ultra material 2; Ultra material 2 vertically is fixed on housing department 11, is provided with balancing weight 13 in the pedestal part 12.
As preferred embodiment, housing department 11 is designed to fillet structure with the junction of pedestal part 12, and housing department 11 is the square plate structure; Housing department 11 is divided into two zones with pedestal part 12, and the area in two zones is unequal, wherein; The part that area is big is trapezoidal; The part that area is little is concave shape, and the outside drawing of MRI magnetic signal enhance device is shown in accompanying drawing 2, and package casing 1 all is adopted as the PVC material.
The structure chart of ultra material 2 is referring to accompanying drawing 3; Constitute with the artificial micro-structural 22 of a plurality of arrays in medium basic unit 21 by medium basic unit 21; Medium basic unit is the epoxy resin fiberglass substrate; Artificial micro-structural is a metallic copper material, and the magnetic permeability of ultra material 2 under MRI magnetic signal operating frequency is-1, is elaborated in the face of ultra material 2 down.
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, therefore, are design and synthetic ultra material, and people have carried out a lot of research work.2000, people such as the Smith of University of California pointed out that the composite construction of metal wire and the open loop resonator (SRR) of periodic arrangement can realize that DIELECTRIC CONSTANTS and magnetic permeability μ simultaneously for negative two negative material, also claim LHM.They are again through going up the two negative material that making metal wire and SRR composite construction have been realized two dimension at printed circuit board (PCB) (PCB) afterwards.Have the metal wire and the open loop resonator structure of response for magnetic field, be referred to as magnetic micro-structure usually.
The magnetic micro-structure of present embodiment adopts spiral shell to get around the choma structure, and accompanying drawing 4 gets around the choma structure for a kind of square spiral shell, on circuit, can equivalence be lc circuit; Annular metal cord equivalent inductance L; Line capacitance equivalent capacity C, therefore, according to the formula
of resonance frequency micro-structural is carried out multiple coiling after; The length of coil increases; Increased inductance L equivalently, line capacitance C increases, thereby has reduced the resonance frequency of micro-structural; The number of turns through the adjustment coiling can be regulated the resonance frequency of micro-structural, and then can regulate the resonance frequency of whole ultra material.According to the characteristic curve diagram of ultra material resonances frequency, referring to accompanying drawing 5, as can be seen from the figure, in a band frequency scope of resonance peak back, the magnetic permeability of ultra material is for negative.Ultra material magnetic permeability is closely related for the resonance frequency of negative frequency band and ultra material; Promptly change along with the variation of ultra material resonances frequency; Therefore through adjusting, can obtain at the negative magnetoconductivity condition lower frequency ultra material identical with MRI equipment work frequency to ultra material resonances frequency.
Present embodiment with above-mentioned ultra material as MRI magnetic signal enhance device; MRI magnetic signal enhance device is positioned between detected part and the magnetic signal receiving coil, because the magnetic signal that detected part is sent is to propagate with evanescent wave, and the propagation of evanescent wave is along with the increase of distance; Has the characteristic that is exponential damping; Therefore existing magnetic signal receiving coil need be close to detected part, and need the profile of magnetic signal receiving coil be designed to match with the detected part shape, to strengthen the reception of magnetic signal; And then the Contrast-enhanced MRI imaging effect, for medical diagnosis provides information more accurately.Have good impedance matching between MRI magnetic signal enhance device and the air for making, reducing the reflection of energy, it is that-1 ultra material is as MRI magnetic signal enhance device that present embodiment is selected magnetic permeability.
The ultra material of negative magnetoconductivity generally is made up of medium substrate and a plurality of magnetic micro-structures of being arranged on the medium substrate; Medium substrate is a dielectric material; Magnetic micro-structure is an electric conducting material; Dielectric material can be selected thermosetting organic resin material, thermosetting organic resin fibre reinforced materials, thermoplasticity organic resin material, ceramic material, ceramic organic resin composite material etc., and electric conducting material is generally selected metallic copper, silver, aluminium or gold.The PCB manufacturing technology is generally adopted in the preparation of ultra material, as: on the epoxy resin fiberglass plate, cover copper, prepare metallic copper magnetic micro-structure array, obtain ultra material through the method for printed circuit.
In the foregoing description, only provided the magnetic micro-structure that a kind of square spiral shell gets around choma, as embodiment, the concave shape spiral shell gets around a mouthful resonant ring, the annular spiral shell gets around choma or the polygon spiral shell gets around the ultra material that choma all can obtain having negative magnetoconductivity.
The MRI magnetic signal enhance device of the foregoing description, ability Contrast-enhanced MRI magnetic signal improves the MRI imaging effect on the one hand, on the other hand, as a kind of passive device, has beneficial effect safe and reliable, easy to use.
In the above-described embodiments, only the present invention has been carried out exemplary description, but those skilled in the art can carry out various modifications to the present invention after reading present patent application under the situation that does not break away from the spirit and scope of the present invention.
Claims (10)
1. MRI magnetic signal enhance device; Be arranged between detected part and the MRI magnetic signal receiving coil in order to the Contrast-enhanced MRI magnetic signal; It is characterized in that: said MRI magnetic signal enhance device comprises package casing and ultra material flat board; The said ultra material flat board ultra material that the ultra material layer of one deck is at least formed of serving as reasons; Said ultra material has negative magnetoconductivity under MRI magnetic signal operating frequency, said ultra material flat board vertically is fixed in the said package casing, said package casing comprise with surpass the dull and stereotyped housing department that cooperates of material with the vertical pedestal part in said housing department plane.
2. MRI magnetic signal enhance device according to claim 1 is characterized in that: be provided with balancing weight in the said pedestal part.
3. MRI magnetic signal enhance device according to claim 1, it is characterized in that: the junction of said housing department and said pedestal part is designed to fillet.
4. MRI magnetic signal enhance device according to claim 1 is characterized in that: said housing department is the square plate structure.
5. MRI magnetic signal enhance device according to claim 1 is characterized in that: said housing department is two zones with said base portion, and the area in said two zones is unequal.
6. MRI magnetic signal enhance device according to claim 5 is characterized in that: in two zones of said pedestal part, the part that area is big is trapezoidal, and the part that area is little is concave shape.
7. MRI magnetic signal enhance device according to claim 5 is characterized in that: said package casing is the PVC material.
8. according to each described MRI magnetic signal enhance device of claim 1 to 7; It is characterized in that: said ultra material layer is made up of medium basic unit and artificial microstructured layers; Said medium basic unit is a dielectric material; Said artificial microstructured layers is an electric conducting material, and said artificial microstructured layers is formed by a plurality of magnetic micro-structure array arrangements.
9. MRI magnetic signal enhance device according to claim 8 is characterized in that: said medium basic unit is the epoxy resin fiberglass substrate, and said artificial microstructured layers is a metallic copper material.
10. MRI magnetic signal enhance device according to claim 8 is characterized in that: said magnetic micro-structure is that spiral shell gets around the choma structure, and the magnetic permeability of said ultra material is-1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210133055.0A CN102694272B (en) | 2012-04-28 | 2012-04-28 | A kind of MRI magnetic signal enhancement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210133055.0A CN102694272B (en) | 2012-04-28 | 2012-04-28 | A kind of MRI magnetic signal enhancement device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102694272A true CN102694272A (en) | 2012-09-26 |
| CN102694272B CN102694272B (en) | 2015-10-07 |
Family
ID=46859597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210133055.0A Active CN102694272B (en) | 2012-04-28 | 2012-04-28 | A kind of MRI magnetic signal enhancement device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102694272B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107835658A (en) * | 2015-07-03 | 2018-03-23 | 圣彼得堡国立信息技术机械与光学大学 | Magnetic resonance imaging machine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6791432B2 (en) * | 2000-03-17 | 2004-09-14 | The Regents Of The University Of California | Left handed composite media |
| CN101150217A (en) * | 2007-11-02 | 2008-03-26 | 清华大学 | Electric field-tunable negative magnetic permeability part based on ferroelectric ceramic grain and its making method |
| CN101568849A (en) * | 2006-12-22 | 2009-10-28 | 皇家飞利浦电子股份有限公司 | RF coil for use in an mr imaging system |
| US20110204891A1 (en) * | 2009-06-25 | 2011-08-25 | Lockheed Martin Corporation | Direct magnetic imaging apparatus and method |
-
2012
- 2012-04-28 CN CN201210133055.0A patent/CN102694272B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6791432B2 (en) * | 2000-03-17 | 2004-09-14 | The Regents Of The University Of California | Left handed composite media |
| CN101568849A (en) * | 2006-12-22 | 2009-10-28 | 皇家飞利浦电子股份有限公司 | RF coil for use in an mr imaging system |
| CN101150217A (en) * | 2007-11-02 | 2008-03-26 | 清华大学 | Electric field-tunable negative magnetic permeability part based on ferroelectric ceramic grain and its making method |
| US20110204891A1 (en) * | 2009-06-25 | 2011-08-25 | Lockheed Martin Corporation | Direct magnetic imaging apparatus and method |
Non-Patent Citations (2)
| Title |
|---|
| S.MASSAOUDI等: "Multiple resonances in arrays of spiral resonators designed for magnetic resonance imaging", 《MICROWAVE AND OPTICAL TECHNOLOGY LETTERS》, vol. 50, no. 7, 31 July 2008 (2008-07-31) * |
| Y.XIE 等: "Proposal of cylindrical rolled-up metamaterial lenses for magnetic resonance imaging application and preliminary experimental demonstration", 《PROGRESS IN ELECTROMAGNETICS RESEARCH》, vol. 124, 31 March 2012 (2012-03-31), pages 151 - 162 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107835658A (en) * | 2015-07-03 | 2018-03-23 | 圣彼得堡国立信息技术机械与光学大学 | Magnetic resonance imaging machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102694272B (en) | 2015-10-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Gruber et al. | RF coils: A practical guide for nonphysicists | |
| Lattanzi et al. | Approaching ultimate intrinsic signal‐to‐noise ratio with loop and dipole antennas | |
| CN104067136B (en) | The multi-resonant T/R antennas generated for MR images | |
| JP6798034B2 (en) | Single-layer magnetic resonance imaging transmit / receive radio frequency coil | |
| CN101950006A (en) | Intracranial and cervical joint radio frequency coil device for magnetic resonance imaging system | |
| US6850065B1 (en) | MRI coil system for breast imaging | |
| US11054491B2 (en) | Dipole antenna assembly for capturing images by means of nuclear magnetic resonance methods | |
| CN203773037U (en) | Mammary-gland magnetic-resonance radiofrequency receiving coil of magnetic-resonance imaging system | |
| CN103296446A (en) | Metamaterial and MRI imaging strengthening device | |
| CN102680921B (en) | The flexible Meta Materials body coil of a kind of novel MRI | |
| CN100469309C (en) | Breast radio-frequency coil device for the horizontal magnetic resonance imaging | |
| US10473736B2 (en) | Subject-loaded helical-antenna radio-frequency coil for magnetic resonance imaging | |
| US11029376B2 (en) | Radio-frequency coil for magnetic resonance device | |
| CN102709704A (en) | MRI (magnetic resonance imaging) magnetic signal enhancement device | |
| CN102694272A (en) | MRI(Magnetic Resonance Imaging) signal enhancement device | |
| CN102709705A (en) | MRI (magnetic resonance imaging) magnetic signal enhancement device | |
| CN102349831A (en) | Superlens based on artificial electromagnetic structure in nuclear magnetic resonance imaging | |
| CN102683879A (en) | Magnetic resonance imaging (MRI) magnetic signal enhancement device | |
| US20170108562A1 (en) | Rf surface coil unit and magnetic resonance imaging system comprising same | |
| CN103367921A (en) | Meta-material and MRI magnetic signal enhancement device | |
| JPWO2012165295A1 (en) | Resonant circuit | |
| CN102680922B (en) | A kind of novel MRI body phased-array coil | |
| US20180299519A1 (en) | Detector grid arrays for mr imaging | |
| CN204649944U (en) | Articulations digitorum manus radio-frequency coil | |
| CN103356187A (en) | MRI (magnetic resonance imaging) magnetic signal enhancing device based on conformal design |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
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. |
|
| TR01 | Transfer of patent right |