CN106468767B - Balance drive formula magnetic resonance radio frequency coil based on microstrip line - Google Patents
Balance drive formula magnetic resonance radio frequency coil based on microstrip line Download PDFInfo
- Publication number
- CN106468767B CN106468767B CN201610805739.9A CN201610805739A CN106468767B CN 106468767 B CN106468767 B CN 106468767B CN 201610805739 A CN201610805739 A CN 201610805739A CN 106468767 B CN106468767 B CN 106468767B
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- microstrip line
- center conductor
- frequency coil
- medium substrate
- center
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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
- G01R33/343—Constructional details, e.g. resonators, specially adapted to MR of slotted-tube or loop-gap type
-
- 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
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Invention provides a kind of balance drive formula magnetic resonance radio frequency coil based on microstrip line, the magnetic resonance radio frequency coil is made of the microstrip line of circular symmetric, the microstrip line includes medium substrate, earth plate and center conductor, wherein medium substrate is symmetrical annular, earth plate is located at the back side of medium substrate, and center conductor is located at the front of medium substrate.The both ends of microstrip line and the centre of center conductor are equipped with frequency of the capacitor for adjusting microstrip line, and microstrip line is connected by the way of the balance drive of center with subsequent receiver or driver.Using structure of the present invention and type of drive, the magnetic field covering of radio-frequency coil axially extends to the area of entire annular covering from cable in its center, and then extends the imageable area of single coil unit.
Description
Technical field
The present invention relates to a kind of radio-frequency coils, and in particular to a kind of balanced type drive-type radio-frequency coil, belong to magnetic resonance at
As field.
Background technology
Magnetic resonance imaging is using the phenomenon that will produce Larmor precession when proton is placed in external magnetic field, to obtain proton
In a kind of imaging means of the location information of spatial distribution.It needs to rely in its imaging process and is wrapped in penetrating outside imaging object
Frequency coil carries out the transmitting and reception of electromagnetic wave.Magnetic resonance imaging has become a kind of very important medical diagnostic method, and
And since it does not generate the characteristic of no ionising radiation, it is widely used in medicine clinical research and diagnosis, and it is greatly promoted doctor
Learn the development of iconography.But the collected radiofrequency signal of MR imaging apparatus is very faint, the range and signal-to-noise ratio of imaging
All influenced by radio-frequency coil.As signal receiving sensor, radio-frequency coil is one of determinant of image quality, and one
It is directly a hot spot in MR investigation field.
Radio-frequency coil used in magnetic resonance is made of basic conductor element, has both played excitation magnetic resonance radio frequency signal
Effect, and play the role of receiving magnetic resonance signal, it is one of core component of magnetic resonance system.Microstrip line is because make letter
It is single, it is at low cost, also there is extensive utilization in magnetic resonance imaging arts.Common micro-strip coil be a medium substrate (such as
Polytetrafluoroethylene (PTFE) either air) upper and lower surface enclose two thin metal layers respectively, a face width great thing earth plate,
Conducting wire centered on another side width is smaller, it, to patch, in conductor patch and is connect using microstrip line or coaxial line probe
Radio frequency electromagnetic field has been encouraged between floor.For the width of earth plate and center conductor, generally require the width of earth plate remote
More than the width of center conductor.
Traditional radio-frequency coil based on microstrip line can be used for the transmitting and reception of radiofrequency signal in magnetic resonance, coil
Both ends are respectively arranged with capacitance, the resonant frequency for adjusting coil, and center conductor is then a complete copper wire, not
Capacitance is located on center conductor.Traditional microstrip line uses the driving of single-ended unbalanced, one end of microstrip line to be used as driving end,
On this driving end, the earth plate of microstrip line accesses the ground terminal of driver, the center conductor of microstrip line as zero potential point
Point is driven as potential, accesses the signal end of driver.As receiving coil in use, microstrip line is linearly, magnetic field is only
The spatial dimension above center conductor is only covered, and the width of magnetic field covering and the width of center conductor are similar, this makes
The area that it can be imaged is smaller.If by traditional microstrip line for being imaged, due to by coil dimension workable for reality
Limitation, earth plate can be similar with the width of the object to be imaged, and it is earth plate width that the width of center conductor, which is much smaller than, at this
It cannot achieve effective covering to the object to be imaged in the case of kind.
Invention content
In view of this, the present invention provides a kind of balance drive formula magnetic resonance radio frequency coil based on microstrip line, pass through change
The structure and type of drive of microstrip line extend the range of its magnetic field covering, and then increase imageable area.
The balance drive formula magnetic resonance radio frequency coil based on microstrip line, including single microstrip line, the microstrip line
Including medium substrate, earth plate and center conductor, the earth plate is set to the back side of medium substrate, and center conductor is set to Jie
The front of matter substrate；The medium substrate, earth plate and center conductor are the symmetrical loop configuration with opening, thus institute
The microstrip line of formation is also the symmetrical annular with opening；
One capacitance is respectively set between the center conductor and earth plate of microstrip line open end both sides；Simultaneously described
Capacitance there are two being also provided on center conductor, and it is located at the intermediate point of center conductor, aforementioned four capacitance after two capacitances series connection
Capacitance it is identical；The radio-frequency coil is connected by the way of the balance drive of center with subsequent driver.
The microstrip line is annulus, square ring or other annulars in symmetric shape.
The type of drive of the radio-frequency coil is：It is to drive point with two capacitances on center conductor, between two capacitances
Point be zero potential point, access the ground terminal of driver；Another endpoint of any one capacitance drives for potential in two capacitances
Dynamic point, accesses the signal end of driver.
Advantageous effect：
The present invention extends the model of its magnetic field covering by the structure and type of drive of radio-frequency coil of the change based on microstrip line
It encloses, and then increases imageable area.Specially：In structure, the radio-frequency coil based on microstrip line is a loop configuration, into
And extend the magnetic field area coverage of microstrip line coil, make the covering of its magnetic field not be confined to abut the space above center conductor,
But expand to the superjacent air space of the entire annular of center conductor composition；In type of drive, using the side of center balance drive
Formula is connected with subsequent receiver.
Description of the drawings
Fig. 1 is the overall structure diagram of the present invention.
Wherein：1- center conductors, 2- earth plates, 3- capacitances, 4- potentials driving point, 5- zero potential points
Specific implementation mode
The present invention will now be described in detail with reference to the accompanying drawings and examples.
The present embodiment provides it is a kind of can be based on the balance drive formula magnetic resonance radio frequency coil of microstrip line, to solve traditional base
In microstrip line radio-frequency coil as receiving coil in use, cannot achieve the problem of effectively being covered to the object to be imaged.
As shown in Figure 1, the magnetic resonance radio frequency coil is made of single microstrip line, the microstrip line includes：Medium substrate connects
Floor 2 and center conductor 1, wherein medium substrate are the symmetrical loop configuration with opening, and the loop configuration can be
Annulus, square loop or other symmetrical annulars, as shown in Figure 1, what is used in the present embodiment is square ring.Medium substrate
Using the good material of insulating properties, polytetrafluoroethylene (PTFE), ceramics or air, the thickness one of medium substrate may be used in practical application
As in 5mm-15mm.The earth plate 2 is located at the back side of medium substrate, and center conductor 1 is set to the front of medium substrate, thus
It is the symmetrical annular with opening to be formed by microstrip line also.It sets the microstrip line to loop configuration, can extend micro-
Magnetic field area coverage with line coil makes the covering of its magnetic field be no longer limited to the space against 1 top of center conductor, but extends
The superjacent air space of the entire loop configuration constituted to center conductor 1.
There are four the capacitance 3 for adjusting micro-strip line frequency, two of which is located at micro- for setting on the microstrip line
Between both ends center conductor 1 and earth plate 2 with line opening, after the series connection of other two capacitance on centrally disposed conducting wire 1, and position
In center conductor 1 intermediate point (due on center conductor 1 be provided with capacitance, center conductor is no longer a complete copper wire,
But separated by two capacitances), as shown in Figure 1, since microstrip line is symmetrical loop configuration, two be located on center conductor 1
A capacitance is opposite with positioned at two capacitances of microstrip line open end.The capacitance of four capacitances is identical.
The microstrip line is connected by the way of the balance drive of center with subsequent receiver, specially：No longer use
The endpoint of microstrip line is driving point as driving point, but with two capacitances on center conductor 1, and the point between two capacitances is
Zero potential point 5 accesses the ground terminal of driver, and using another endpoint of wherein any one capacitance as potential, driving point 4, connects
Enter the signal end of driver.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in the present invention's
Within protection domain.
Claims (2)
1. the balance drive formula magnetic resonance radio frequency coil based on microstrip line, including single microstrip line, the microstrip line include medium
Substrate, earth plate and center conductor, the earth plate are set to the back side of medium substrate, and center conductor is set to medium substrate
Front；It is characterized in that, the medium substrate, earth plate and center conductor are the symmetrical loop configuration with opening, by
It is the symmetrical annular with opening that this, which is formed by microstrip line also,；
One capacitance is respectively set between the center conductor and earth plate of microstrip line open end both sides；Simultaneously at the center
Capacitance there are two being also provided on conducting wire, and it is located at the intermediate point of center conductor, the electricity of aforementioned four capacitance after two capacitances series connection
Capacitance is identical；The radio-frequency coil is connected by the way of the balance drive of center with subsequent driver；The center balance drive
Mode specifically refer to two capacitances on center conductor be driving point, the point between two capacitances is zero potential point, access
The ground terminal of driver is driven point using another endpoint of wherein any one capacitance as potential, accesses the signal of driver
End.
2. the balance drive formula magnetic resonance radio frequency coil based on microstrip line as described in claim 1, it is characterised in that：It is described micro-
It is annulus, square ring or other annulars in symmetric shape with line.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2016103680970 | 2016-05-30 | ||
| CN201610368097 | 2016-05-30 |
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| Publication Number | Publication Date |
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| CN106468767A CN106468767A (en) | 2017-03-01 |
| CN106468767B true CN106468767B (en) | 2018-09-28 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107589386A (en) * | 2017-09-01 | 2018-01-16 | 石建国 | A kind of adaptive RF coil and the coil array for being easy to wearing |
| CN110873854B (en) * | 2018-08-29 | 2022-05-17 | 上海联影医疗科技股份有限公司 | Magnetic resonance receiving coil and magnetic resonance receiving coil assembly |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0325351A2 (en) * | 1988-01-19 | 1989-07-26 | The Regents Of The University Of California | Switchable MRI RF coil array with individual coils having different and overlapping fields of view |
| CN2221939Y (en) * | 1995-06-05 | 1996-03-13 | 深圳安科高技术有限公司 | Radio-frequency coil device for magnetic resonance imaging system |
| CN101268379A (en) * | 2005-09-20 | 2008-09-17 | 皇家飞利浦电子股份有限公司 | RF traps for radio frequency coils used in MRI |
| CN103033778A (en) * | 2012-12-10 | 2013-04-10 | 奥泰医疗系统有限责任公司 | Dual-band radio frequency surface coil |
| CN104698411A (en) * | 2015-02-13 | 2015-06-10 | 江苏麦格思频仪器有限公司 | Multichannel radio frequency coil for open type magnetic resonance imaging system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7420371B2 (en) * | 2006-01-04 | 2008-09-02 | Enh Research Institute | Slab-selective RF coil for MR system |
| EP1991888A4 (en) * | 2006-03-09 | 2010-01-20 | Insight Neuroimaging Systems L | Microstrip coil designs for mri devices |
-
2016
- 2016-09-06 CN CN201610805739.9A patent/CN106468767B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0325351A2 (en) * | 1988-01-19 | 1989-07-26 | The Regents Of The University Of California | Switchable MRI RF coil array with individual coils having different and overlapping fields of view |
| CN2221939Y (en) * | 1995-06-05 | 1996-03-13 | 深圳安科高技术有限公司 | Radio-frequency coil device for magnetic resonance imaging system |
| CN101268379A (en) * | 2005-09-20 | 2008-09-17 | 皇家飞利浦电子股份有限公司 | RF traps for radio frequency coils used in MRI |
| CN103033778A (en) * | 2012-12-10 | 2013-04-10 | 奥泰医疗系统有限责任公司 | Dual-band radio frequency surface coil |
| CN104698411A (en) * | 2015-02-13 | 2015-06-10 | 江苏麦格思频仪器有限公司 | Multichannel radio frequency coil for open type magnetic resonance imaging system |
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| CN106468767A (en) | 2017-03-01 |
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