CN102650684A - Magnetic resonance imaging radio-frequency coil device - Google Patents
Magnetic resonance imaging radio-frequency coil device Download PDFInfo
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- CN102650684A CN102650684A CN2011100471006A CN201110047100A CN102650684A CN 102650684 A CN102650684 A CN 102650684A CN 2011100471006 A CN2011100471006 A CN 2011100471006A CN 201110047100 A CN201110047100 A CN 201110047100A CN 102650684 A CN102650684 A CN 102650684A
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- coil
- coils
- resonance imaging
- magnetic resonance
- hollow cylinder
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Abstract
The invention discloses a magnetic resonance imaging radio-frequency coil device, which includes a coil hollow cylinder frame, a coil circuit and cylindrical housing, wherein the coil circuit is placed in the groove of the hollow cylinder frame; 4 surface coils with identical performance are utilized, every two coils are crossed and connected, so as to form two groups of crossed coils, and the 4 surface coils are uniformly encircled on the hollow cylinder frame, as a result, higher SNR can be achieved. In order to overcome the mutual inductance between the coils and decouple the radio-frequency coil device, the capacitance and the decoupling circuit are utilized for connecting the coils, and the two groups of the coils are overlapped.
Description
Technical field
The present invention relates to a kind of magnetic resonance imaging system, specifically, the present invention relates to serial radio frequency coil device in the magnetic resonance imaging.
Background technology
Magnetic resonance imaging (Magnetic Resonace Imaging MRI) is to utilize atomic nucleus in magnetic field, to resonate to produce a kind of technology that signal undergoes reconstruction and forms images.Use the material that can produce net spin (like the proton in the human body
1H), because of proton belt positive electricity, and spin motion, produce little magnetic moment, like same small magnetic needle, the direction of small magnetic needle is irregular, but puts into level or vertical main field B uniformly
0In after, it does the precession campaign, precession frequency is by Larmor theorem ω
0=γ B
0Decision, most small magnetic needle can be arranged along the direction of externally-applied magnetic field again, and produces magnetic moment M
0Add radio frequency (Radio Frequency RF) B according to More's theorem
1Excite, and make magnetic moment M
0Change.B
1Direction must be perpendicular to B
0, the radio frequency B that adds
1After a period of time stops; The proton that is excited progressively discharges the energy that is absorbed; With a coil energy measuring that discharges is come out; Be called free induction decay signal (Free Induction Decay FID), the atomic nucleus that then is excited can progressively discharge what absorbed, the state before its phase place and energy level all return to and excite.And the energy that receives these releases is to use various radio-frequency coils.This signal contains the information of human body proton, is used for imaging.
Can find out that from above radio-frequency coil plays an important effect the magnetic resonance imaging system.He is mainly used in the transmitting RF pulse, accepts free induction signal (FID).The performance quality of coil directly influences the quality of image.
(signal to noise ratio, SNR), in the diagnosis of medical image, surface coils can be close to patient's diseased region, has higher resolution because of surface coils has very high s/n ratio.But the magnetic field that surface coils produced is inhomogeneous, and the degree of depth that penetrates is limited.
In order to overcome the shortcoming of surface coils, the series connection of application surface coil evenly is centered around on hollow cylinder or the hollow ellipse cylinder, so both higher SNR can be arranged, and the degree of depth that can obtain to penetrate preferably again improves the magnetic field homogeneity that coil produced.Improve coil quality factor (Q).For the parallel radio frequency coil imaging technique that uses with magnetic resonance imaging at present matches,, be named as magnetic resonance imaging serial radio frequency coil device with the tandem arrangement of a plurality of coils.
Summary of the invention
The present invention provides a kind of novelty and coil device simple in structure, and the problem that solve is that design improves the high s/n ratio (SNR) of coil, improves the magnetic field homogeneity that coil produced.Use the consistent surface coils of 4 performances; Wherein two coils intersect continuous; Form two groups of chiasma type coils; Fig. 1 i.e. (20) forms two groups of chiasma type coils with (50) and (30) and (40), in order to overcome the mutual inductance between the coil, coil (20) is overlapped with (30) and (40) and (50) carry out uncoupling.
Description of drawings
Characteristics of the present invention are further described with implementing in conjunction with accompanying drawing.
Fig. 1 is a string line coil structures volume rendering synoptic diagram of the present invention.
Fig. 2 is the appearance figure of serial coil of the present invention.
Embodiment
Fig. 2 is that the appearance figure (10) of serial coil of the present invention makes the skeleton of coil for hollow cylinder, and (70) are coil case.In this embodiment, two circular grooves are opened along damaged surface circular arc direction in the right cylinder two ends, along the cylinder direction four grooves are set again.Fig. 1 is a string line coil structures volume rendering synoptic diagram of the present invention, (40) two coils of coil (20) and coil (50) and coil (30) and coil is intersected link to each other, and forms two groups of coils and is positioned in the groove of (10), and two groups of coil tandems are got up.Coil (20) and coil (30) and coil (40) are overlapped with coil (50).The characteristic of each small coil is identical, and (60) are coil radiofrequency signal output interface, uses electric capacity between coil and is coupled with the circuit of uncoupling.
In the present embodiment, coil is positioned in the groove of hollow cylinder skeleton, column type (70) the shell protection that outside employing is bigger, and the size of shell just in time can make placement coil hollow cylinder skeleton just in time combine closely, and fixes with no magnetic material.Open the groove of four perforations again in the centre of four coils, help ventilating and reducing loss.
The relevant scientific and technical personnel in this technical field can make amendment to the profile of Fig. 1 and Fig. 2, can change other shape into according to application need with getting hollow cylinder in the present embodiment, like the hollow ellipse cylinder, and hollow four-side body etc.And the respective coil electric wire made certain deformation, help actual demand.
Relevant scientific and technical personnel in this technical field add fixed base plate, fixed support and the fixed band of coil to the scheme of Fig. 2, help concrete practical and convenient purpose to reach.
Can on the basis that does not break away from principle of the present invention, make up many embodiments, except that the needs that right requires, the invention is not restricted to desired specific embodiment in the instructions.
Claims (4)
1. string line coil apparatus that is applied to magnetic resonance imaging, principal feature is that described string line coil apparatus comprises: the coil inner casing, coil case, described coil inner casing is a hollow cylinder, the said coil inner casing coil wire of arranging.Said coil case plays fixing and protective effect.
2. string line coil apparatus as claimed in claim 1 is characterized in that the surface coils that 4 performances are consistent.
3. string line coil apparatus as claimed in claim 2 is characterized in that forming two groups of coils, with these two groups of coil tandems with wherein two coils intersections are continuous.
4. like claim 1,2,3 described string line coil apparatus, coil inner casing hollow cylinder is replaced with the hollow ellipse cylinder, the hollow four-side body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100471006A CN102650684A (en) | 2011-02-23 | 2011-02-23 | Magnetic resonance imaging radio-frequency coil device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100471006A CN102650684A (en) | 2011-02-23 | 2011-02-23 | Magnetic resonance imaging radio-frequency coil device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102650684A true CN102650684A (en) | 2012-08-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100471006A Pending CN102650684A (en) | 2011-02-23 | 2011-02-23 | Magnetic resonance imaging radio-frequency coil device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1085767A (en) * | 1992-10-22 | 1994-04-27 | 广东威达医疗器械集团公司 | Medical instrument with even magnetic field |
| US20050033150A1 (en) * | 2001-09-13 | 2005-02-10 | Tetsuhiko Takahashi | Medicinal composition |
| CN1813200A (en) * | 2003-06-24 | 2006-08-02 | 皇家飞利浦电子股份有限公司 | MRI RF surface coil with reduced sensitivity in proximity of conductors |
| WO2006114923A1 (en) * | 2005-04-25 | 2006-11-02 | Hitachi, Ltd. | Inspection equipment employing magnetic resonance |
| CN201110892Y (en) * | 2007-11-08 | 2008-09-03 | 南通大学附属医院 | Magnetic resonance imaging small animal radio-frequency coil apparatus |
| CN101762798A (en) * | 2010-01-05 | 2010-06-30 | 陈武凡 | Radio-frequency coil structure applied to low-magnetic field resonance imaging in thermal-ablation therapy |
-
2011
- 2011-02-23 CN CN2011100471006A patent/CN102650684A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1085767A (en) * | 1992-10-22 | 1994-04-27 | 广东威达医疗器械集团公司 | Medical instrument with even magnetic field |
| US20050033150A1 (en) * | 2001-09-13 | 2005-02-10 | Tetsuhiko Takahashi | Medicinal composition |
| CN1813200A (en) * | 2003-06-24 | 2006-08-02 | 皇家飞利浦电子股份有限公司 | MRI RF surface coil with reduced sensitivity in proximity of conductors |
| WO2006114923A1 (en) * | 2005-04-25 | 2006-11-02 | Hitachi, Ltd. | Inspection equipment employing magnetic resonance |
| CN201110892Y (en) * | 2007-11-08 | 2008-09-03 | 南通大学附属医院 | Magnetic resonance imaging small animal radio-frequency coil apparatus |
| CN101762798A (en) * | 2010-01-05 | 2010-06-30 | 陈武凡 | Radio-frequency coil structure applied to low-magnetic field resonance imaging in thermal-ablation therapy |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120829 |