CN106526512A - Radio frequency coil capable of being used for head nuclear magnetic resonance imaging - Google Patents
Radio frequency coil capable of being used for head nuclear magnetic resonance imaging Download PDFInfo
- Publication number
- CN106526512A CN106526512A CN201611080215.4A CN201611080215A CN106526512A CN 106526512 A CN106526512 A CN 106526512A CN 201611080215 A CN201611080215 A CN 201611080215A CN 106526512 A CN106526512 A CN 106526512A
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- China
- Prior art keywords
- coil
- magnetic resonance
- nuclear magnetic
- radio
- frequency coil
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34007—Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
Abstract
The invention discloses a radio frequency coil capable of being used for head nuclear magnetic resonance imaging. The coil includes an upper layer and a lower layer, adopts copper as material, intervals among turns of the coil are equal, all parts of the coil do not break, the two layers of the coil are connected as whole, and the coil is rectangular. The radio frequency coil provided by the invention provides a radio frequency magnetic field required in a nuclear magnetic resonance system, static magnetic field uniform areas generated by the radio frequency coil are located at upper and lower sides of a radio frequency coil structure, and magnetic field direction is horizontal. Only the head needs to be put on the coil for detection, the coil is utilized to set up the nuclear magnetic resonance system, and the purpose of open measurement can be achieved. In addition, the coil has good performance, and when the coil is utilized to set up an experimental platform to conduct an experiment, measured nuclear magnetic resonance signals are good, and thus the coil has such advantages that other radio frequency coils cannot be compared with.
Description
Technical field
The present invention relates to head disease detecting instrument field, more particularly to a kind of to can be used for penetrating for head NMR (Nuclear Magnetic Resonance)-imaging
Frequency coil, can be used to build a kind of small-sized, portable, cheap open nuclear magnetic resonance system, can be used for head disease patient bed
Other real-time detection.
Background technology
In nuclear magnetic resonance（Magnetic Resonance Imaging, MRI）In, radio-frequency coil is to launch and acceptance is penetrated
The source device of the nmr frequency of the special purpose device of rate, or perhaps offer again and again.Send out currently used for the radio-frequency coil of MRI
Open up forth generation.The first generation is linear polarization surface coils；The second filial generation is Circular Polarisation surface coils, and it is than the linear pole of the first generation
The signal to noise ratio for changing surface coils improves more than 40%；The third generation is Circular Polarisation phased-array coil, by means of general in radio
Phased-array radar principle, each coil is made up of multiple little coil units, by Phase Stacking or is subtracted each other, and reaches reduction secondary lobe
Purpose, so as to drastically increase sensitivity, significantly increase the signal to noise ratio of image；The forth generation released for 1997 is phased
Front's circle is also referred to as integral panoramic phased-array coil, and it is combination type array coil, can be carried out any between coil and coil
Combination.When laying patient, multigroup coil can be fixed on patient together, the various combination of coil is realized using software operation
And fractionation, the inspection to different parts and diagnosis is completed, this is particularly important for the patient for once carrying out multiple location inspection is needed.
It was verified that the performance of forth generation integral panoramic phased-array coil is more excellent than the third generation and uses convenient.
Nuclear magnetic resonance technique is widely used in life medical treatment, food analyses, quality control as a kind of nondestructiving detecting means
The fields such as system, material science and geophysics.Radio-frequency coil receives the front end of chain as signal, most important to image quality,
And relative to miscellaneous part, with being easy to the characteristics of developing and optimize, therefore the always hot issue of MRI research fields.
The radio-frequency coil of generation and the mutually perpendicular static radio-frequency (RF) magnetic field in main magnet magnetic field is the core component of nuclear magnetic resonance apparatus, at present
The classification of radio-frequency coil is broadly divided into following six part with typical case's application：1）Birdcage coil.Uniform laterally electricity can be produced
Magnetic field, is adapted to work in orthogonal modes, but is not suitable for vertical magnetic field system；2）Toroidal winding.Small volume, can also realize
Well-proportioned Distribution of Magnetic Field, but due to the restriction of magnetic direction, coil is all restricted in space utilization and lateral cephalogram,
It is mainly used in non-tubular magnet and intervention coil；3）Saddle-shaped coils.It is characterized in z-axis direction, magnetic field has very high uniform
Property and the matching with magnet, sensitivity is higher than the toroidal winding of same size 3 times, and good cost performance；4）He Mu
Hertz coil.Its advantage is patient's easy access, has the disadvantage that field distribution uniformity is poor, and magnetic field intensity focuses primarily upon coil electricity
Around logical circulation road, and the field intensity in centrally located region is less, is suitable for making breast coil, neck coil etc.；5）Transverse electromagnetic mode
Coil.Transverse electromagnetic mode coil is easy to tuning, and high frequency field uniformity is very well, and maximum difference is it with birdcage coil
A part of the outer shield as circuit, with internal transmission line composition loop, makes whole coil as transmitted work(with standing wave
Energy lead transmission line more；6）Annulus.Smaller group suitable for being close to human body surface knits the imaging of organ, such as vertebra, table
Planar coil is the first-selection of receiving coil.
At present in the urgent need to it is a kind of it is small-sized, cheap, be easy to mobile and the nuclear magnetic resonance, NMR detected by bed can be provided for sufferer
The be suitable for radio-frequency coil of system.Its better performances in every respect is needed, open measurement is disclosure satisfy that, and uniformity of magnetic field,
Intensity, direction levelness are preferable.Here it is the present invention needs the problem for solving.
The content of the invention
For the deficiency of above radio-frequency coil, the present invention is in order to realize to carry out head the radio frequency line of NMR (Nuclear Magnetic Resonance)-imaging
Circle, there is provided a kind of to form the radio-frequency coil structure of uniform magnetic field in radio-frequency coil both sides.
The purpose of the present invention is realized by such technical scheme：It is a kind of to can be used for penetrating for head NMR (Nuclear Magnetic Resonance)-imaging
Frequency coil, including four coil units, each two coil unit constitutes the structure that upper and lower two-layer is parallel to each other in same plane；
Each coil units in series is a branch road for supplying current flowing, and each coil unit is not turned off, and has excitation input point and excitation defeated
Go out a little.Region forms static magnetic field homogeneity range above and below the radio-frequency coil for head NMR (Nuclear Magnetic Resonance)-imaging
Domain.
The coil unit is made up of some circle coils, is rectangular configuration per circle coil, per the turn-to-turn between circle coil away from phase
Together.Each side of each circle coil is parallel to each other, i.e., it is long while with it is long while it is parallel, minor face is parallel with minor face.The cross section of the coil is
Rectangle.
The excitation input point and excitation output point are separately positioned on upper and lower two-layer.Excitation addition manner be from one layer swash
Input point inflow is encouraged, then is flowed out from another layer of excitation output point.
Further, in order to fix this radio-frequency coil, also wrap the plastic plate for fixed RF coil, and respectively with it is described
Excitation input point and the pad of excitation output point connection.
Further, coil inside described in embodiments of the invention is copper product, and outside is insulating barrier.
Present invention also offers a kind of application mode of the radio-frequency coil of the present invention, foregoing radio-frequency coil is by head
Portion's fixing device is fixed on head, carries out NMR (Nuclear Magnetic Resonance)-imaging.
It is an advantage of the current invention that：A kind of radio-frequency coil for head NMR (Nuclear Magnetic Resonance)-imaging, the coil are plane formula
Complete Open architecture, the static magnetic field homogeneous area of generation are located at the both sides of loop construction, so human body head need not be put
Enter, complete open measurement can be reached, a kind of open head nuclear magnetic resonance, NMR is realized
Imaging；Secondly as the particularity of coil shape structure designed by the present invention so that the magnetic field of generation is in the uniform of central area
Degree is more preferable, and magnetic direction is up to the standard state in central area, and the main field vertically upward that can be produced with magnet be hung down completely
It is straight producing NMR signal；Finally, loop construction adopts dual structure so that the magnetic field intensity that coil is produced is increased greatly
Plus so that the NMR signal intensity measured is greatly increased.
The further advantage of the present invention, target and feature will be illustrated to a certain extent in the following description, and
And to a certain extent, based on being will be apparent to investigating hereafter to those skilled in the art, Huo Zheke
To be instructed from the practice of the present invention.The objects and other advantages of the present invention can be wanted by description below, right
Seek structure specifically noted in book and accompanying drawing to realize and obtain.
Description of the drawings
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with accompanying drawing the present invention is made into
The detailed description of one step, wherein：
Fig. 1 is radio-frequency coil structure schematic diagram provided in an embodiment of the present invention；
Fig. 2 is the two-layer floor map up and down of radio-frequency coil provided in an embodiment of the present invention；
Fig. 3 is the magnetic field size distribution that radio-frequency coil provided in an embodiment of the present invention is produced；
Fig. 4 is the magnetic direction that radio-frequency coil provided in an embodiment of the present invention is produced；
Fig. 5 is the nuclear magnetic resoance spectrum that radio-frequency coil provided in an embodiment of the present invention carries out that NMR (Nuclear Magnetic Resonance)-imaging is obtained；
Fig. 6 carries out the transverse relaxation attenuation curve that NMR (Nuclear Magnetic Resonance)-imaging is obtained for the radio-frequency coil that present invention enforcement is provided.
Specific embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.
As shown in figure 1, the present invention provide a kind of head NMR (Nuclear Magnetic Resonance)-imaging radio-frequency coil, by upper and lower two-layer coil,
For fixed plastic plate（It is not drawn in figure）Composition, above and below the coil, region forms static magnetic field homogeneity range
Domain, magnetic direction level.
The radio-frequency coil generally rectangle, coil section is rectangle, and away from identical, each turn-to-turn is mutual for each turn-to-turn of coil
It is parallel, it is long while with it is long while it is parallel, minor face is parallel with minor face.Electric current is added to flow into by wherein one layer branch road A of coil, by another layer line circle
Branch road B flow out.The coil is made up of copper product, is fixed by plastic plate, forms double-deck " day " wordline circle.
A kind of penetrating for head NMR (Nuclear Magnetic Resonance)-imaging that one specific embodiment of the present invention is provided is described below in detail
Frequency loop construction：
The coil of the specific embodiment of the invention is made up of upper and lower two-layer coil.As illustrated in fig. 1 and 2, including upper and lower two layer line
Circle, actual coil also include the plastic plate for fixed coil structure, and pad, and coil inside is copper product, and outside is adopted
Insulated with plastics.In FIG, rectangle of the coil section for 0.5 mm × 0.1 mm, turn-to-turn choose 0.5 mm away from same,
Material is copper, and the number of turn is 5 circles（When the actual number of turn is in the range of 5-8 circles, the uniformity and the depth of parallelism in magnetic field is preferable）, radio-frequency coil
Overall a length of 40 mm, a width of 23 mm.Coil is connected up and down, and left and right is mutually connected in-x directions, and A, B branch road and the-x of coil have plane
Intersecting section, intersects the excitation current source for adding 1 A at section respectively at two, and A branch current streams enter, and B branch currents flow out.
Fig. 2 is the bilevel floor map of radio-frequency coil provided in an embodiment of the present invention.Its plane at the middle and upper levels
1st, 2,3 points respectively with lower layer plane 4,5,6 points be connected, E', F' solder joint of lower floor is overlapped with upper strata E, F point respectively, that is, go up
Each two solder joints of lower two-layer can be used.
Fig. 3 is the Distribution of Magnetic Field that radio-frequency coil provided in an embodiment of the present invention is produced.From the figure 3, it may be seen that double-deck " day " wordline
Circle top centre position（Z-axis）Place, induction level of the magnetic field on certain altitude is 10-3 The T orders of magnitude, the order of magnitude
Magnetic field range it is larger, magnetic induction is larger so that the NMR signal for carrying out obtaining during nuclear magnetic resonance, NMR practical application is strong
Degree is greatly increased.
Fig. 4 is the magnetic direction that radio-frequency coil provided in an embodiment of the present invention is produced.From fig. 4, it can be seen that double-deck " day "
Wordline circle magnetic direction levelness at the z coordinate position preferably, meets experiment condition.Only need to put object being measured in experiment
In the top of coil, open purpose can be fully achieved.
Fig. 5 is the nuclear magnetic resoance spectrum that radio-frequency coil provided in an embodiment of the present invention carries out that NMR (Nuclear Magnetic Resonance)-imaging is obtained.Utilize
The radio-frequency coil can carry out NMR (Nuclear Magnetic Resonance)-imaging well, disturb little, and signal to noise ratio is high, and signal is good.
Fig. 6 is the transverse relaxation decay song that radio-frequency coil provided in an embodiment of the present invention carries out that NMR (Nuclear Magnetic Resonance)-imaging is obtained
Line.The transverse relaxation attenuation curve of measured object can be measured using the radio-frequency coil designed by the present invention, can be directly obtainedT 2
The size of value, high precision, sensitivity are good, can perform well in the NMR (Nuclear Magnetic Resonance)-imaging of human body head.
Claims (8)
1. a kind of radio-frequency coil that can be used for head NMR (Nuclear Magnetic Resonance)-imaging, it is characterised in that：Including four coil units, each two
Coil unit constitutes the structure that upper and lower two-layer is parallel to each other in same plane；Each coil units in series is one for current flowing
Branch road, and there is excitation input point and excitation output point.
2. a kind of radio-frequency coil that can be used for head NMR (Nuclear Magnetic Resonance)-imaging according to claim 1, it is characterised in that：The line
Coil unit is made up of some circle coils, is rectangular configuration per circle coil, per the turn-to-turn between circle coil away from identical.
3. a kind of radio-frequency coil that can be used for head NMR (Nuclear Magnetic Resonance)-imaging according to claim 2, it is characterised in that：It is described each
Each side of circle coil is parallel to each other.
4. a kind of radio-frequency coil that can be used for head NMR (Nuclear Magnetic Resonance)-imaging according to claim 1 or 2 or 3, it is characterised in that：
The cross section of the coil is rectangle.
5. a kind of radio-frequency coil that can be used for head NMR (Nuclear Magnetic Resonance)-imaging according to claim 4, it is characterised in that：It is described to swash
Encourage input point and excitation output point is separately positioned on upper and lower two-layer.
6. a kind of radio-frequency coil that can be used for head NMR (Nuclear Magnetic Resonance)-imaging according to claim 1 or 2 or 3 or 5, its feature exist
In：Plastic plate for fixed RF coil, and the weldering being connected with the excitation input point and excitation output point respectively are wrapped also
Contact.
7. a kind of radio-frequency coil that can be used for head NMR (Nuclear Magnetic Resonance)-imaging according to claim 6, it is characterised in that：The line
It is copper product that circle is internal, and outside is insulating barrier.
8. head is fixed on by head fixing device using radio-frequency coil described in any one of claim 1 to 7, carries out nuclear-magnetism altogether
Shake imaging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611080215.4A CN106526512A (en) | 2016-11-30 | 2016-11-30 | Radio frequency coil capable of being used for head nuclear magnetic resonance imaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611080215.4A CN106526512A (en) | 2016-11-30 | 2016-11-30 | Radio frequency coil capable of being used for head nuclear magnetic resonance imaging |
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| Publication Number | Publication Date |
|---|---|
| CN106526512A true CN106526512A (en) | 2017-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611080215.4A Pending CN106526512A (en) | 2016-11-30 | 2016-11-30 | Radio frequency coil capable of being used for head nuclear magnetic resonance imaging |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07231881A (en) * | 1994-02-22 | 1995-09-05 | Ge Yokogawa Medical Syst Ltd | Rf coil for mri, and mri device |
| JPH07303621A (en) * | 1994-05-12 | 1995-11-21 | Ge Yokogawa Medical Syst Ltd | Rf coil for mri |
| CN1310343A (en) * | 2000-02-21 | 2001-08-29 | 通用电器横河医疗系统株式会社 | RF coil and magnetic resonance imaging method and equipment |
| CN1344533A (en) * | 2000-09-19 | 2002-04-17 | Ge医疗系统环球技术有限公司 | Coil driving method and apparatus and magnetic resonance imaging device |
| CN101617374A (en) * | 2007-01-26 | 2009-12-30 | 松下电工株式会社 | Multilayer device |
| US7999548B1 (en) * | 2008-08-27 | 2011-08-16 | Martin R. Prince | Dual lower extremity MRI coil array with simultaneously independent MRI signal detection from both legs |
| CN104155622A (en) * | 2014-08-26 | 2014-11-19 | 国家电网公司 | Planar radio frequency coil for nuclear magnetic resonance |
-
2016
- 2016-11-30 CN CN201611080215.4A patent/CN106526512A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07231881A (en) * | 1994-02-22 | 1995-09-05 | Ge Yokogawa Medical Syst Ltd | Rf coil for mri, and mri device |
| JPH07303621A (en) * | 1994-05-12 | 1995-11-21 | Ge Yokogawa Medical Syst Ltd | Rf coil for mri |
| CN1310343A (en) * | 2000-02-21 | 2001-08-29 | 通用电器横河医疗系统株式会社 | RF coil and magnetic resonance imaging method and equipment |
| CN1344533A (en) * | 2000-09-19 | 2002-04-17 | Ge医疗系统环球技术有限公司 | Coil driving method and apparatus and magnetic resonance imaging device |
| CN101617374A (en) * | 2007-01-26 | 2009-12-30 | 松下电工株式会社 | Multilayer device |
| US7999548B1 (en) * | 2008-08-27 | 2011-08-16 | Martin R. Prince | Dual lower extremity MRI coil array with simultaneously independent MRI signal detection from both legs |
| CN104155622A (en) * | 2014-08-26 | 2014-11-19 | 国家电网公司 | Planar radio frequency coil for nuclear magnetic resonance |
Non-Patent Citations (2)
| Title |
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| 李春莉: "脑水肿检测的开放式核磁共振测量与成像研究", <<中国优秀硕士学位论文全文数据库医药卫生科技辑>> * |
| 籍勇亮等: "单边核磁共振仪中射频线圈的优化", 《电工电能新技术》 * |
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Application publication date: 20170322 |
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