CN106980097A - Birdcage coil and its tuning methods for magnetic resonance imaging system - Google Patents
Birdcage coil and its tuning methods for magnetic resonance imaging system Download PDFInfo
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- CN106980097A CN106980097A CN201710359552.5A CN201710359552A CN106980097A CN 106980097 A CN106980097 A CN 106980097A CN 201710359552 A CN201710359552 A CN 201710359552A CN 106980097 A CN106980097 A CN 106980097A
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- shaped conductor
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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
- G01R33/34046—Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils
- G01R33/34076—Birdcage coils
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The present invention relates to the birdcage coil and its tuning methods for magnetic resonance imaging system, including upper ring shaped conductor, a plurality of linear conductor of lower ring shaped conductor and connection therebetween being distributed on cylindrical surface；Multiple capacitors are in series with the upper ring shaped conductor and lower ring shaped conductor；The linear conductor is entirely or partially flexible deformation；When adjusting the degree of the linear conductor flexural deformation, the distance between the upper ring shaped conductor and lower ring shaped conductor change, so as to change the resonant frequency of the birdcage coil.The present invention adjusts resonant frequency by changing the position of debugging ring, instead of expensive tunable capacitor device, reduces the cost of birdcage coil, can easily be debugged in the erecting bed of magnetic resonance system；The structure of the whole birdcage coil of synchronous adjustment of the present invention, tuning range is than larger；The uniformity of the distribution of coil current and the RF magnetic field of coil inside is not influenceed；Mechanical structure is stable, can bear higher voltage.
Description
Technical field
The present invention relates to the radio-frequency transmissions in mr imaging technique, more particularly to magnetic resonance imaging system and reception skill
Art, specifically, the present invention relates to the birdcage coil and its tuning methods for magnetic resonance imaging system.
Background technology
Mr imaging technique has become one of important tool of medical clinic applicationses and research, with Noninvasive,
Without ionization, it is radiationless the features such as, radio-frequency coil therein is a critical elements of imaging system, to image quality have act foot
The effect of weight, directly affects signal noise ratio (snr) of image.Magnetic resonance imaging system launches electromagnetic wave to human body by radio-frequency sending coil
Tissue is excited, and resonance signal is produced in tissue, is received by RF receiving coil, is then fed into computer system progress
Imaging.So radio-frequency sending coil plays very crucial effect in magnetic resonance imaging system.In order to obtain high-quality magnetic
Resonance scan image, it is desirable to electromagnetic field (the abbreviation B that radio-frequency sending coil is produced1) there is good uniformity.In birdcage coil
The heart can be produced than more uniform radio frequency electromagnetic field, thus magnetic resonance system generally all using birdcage coil as transmitting coil or
Person's transmit-receive sharing coil.
As shown in figure 1, be a kind of conventional birdcage coil in the prior art, including two be oppositely arranged on position are parallel
Ring shaped conductor, using the connection of many linear conductors between two ring shaped conductors, and assemble multiple on two ring shaped conductors
Electric capacity.In order to obtain uniform RF magnetic field, it is desirable to the homogeneous current distribution in birdcage coil in the operating condition, while birdcage
Coil must also resonance in magnetic resonance frequency W0On.Magnetic resonance frequency W0Also referred to as Larmor frequency (Lamor), is mainly total to by magnetic
Static magnetic field strength B in imaging system of shaking0Determine.
W0=γ B0
γ is Larmor's constant.
In Fig. 1, birdcage coil have above and below two ring shaped conductors, 16 linear conductors companies have been used between two ring shaped conductors
Connect, 16 electric capacity of having been connected respectively on two ring shaped conductors are respectively：The electric capacity of upper ring shaped conductor includes C1~C16, lower annular
The electric capacity of conductor includes C17~C32, in order that the coil can reach optimal launching effect, obtain optimal uniform field, it is necessary to
The value of all electric capacity in each annular is as consistent as possible, the CURRENT DISTRIBUTION that can so allow on coil than more uniform so that
A uniform radio frequency electromagnetic field B is produced in coil1。
In actual manufacturing process, it is necessary to which the resonance point for adjusting coil is Larmor frequency, generally by adjusting in coil
The capacitance of series connection changes the resonance point of coil.If electric capacity C1~C32 all using the electric capacity of fixed value, is adjusted each time
Capacitance is required at least 16 electric capacity of synchronous replacement, the extremely complex and excessive welding operation of the debugging of manufacturing process
It is easily caused circuit board or electric capacity is impaired.Therefore in order to simplify manufacturing process, it will usually use the adjustable electric capacity of capacitance.By
Higher in high voltage bearing tunable capacitor cost, if each coil uses 16 or 32 tunable capacitors, coil cost will
Can be very high.If simply portion uses tunable capacitor wherein, the adjustable model of finished product coil resonance point can be caused
Enclose very small, and because the capacitance of diverse location is variant after adjustment, coil current distribution becomes uneven, causes coil
Interior electromagnetic field B1Also become uneven.
Produce static magnetic field strength B0Magnet typically use electromagnet or permanent-magnet, with mr imaging technique
Development, it is intended that higher static magnetic field strength B0, at this time often use superconducting magnet.When magnet is pacified in screened room
When dress, due to the difference of material and space enrironment, cause produced static magnetic field strength B0Also there is certain difference,
Moreover, the error of coil processing and manufacturing process also results in certain difference.This requires all and supporting radio frequency of the magnet
Coil is required for adjusting resonant frequency accordingly, as described above, the tuning process of existing birdcage coil is complicated, to magnetic resonance imaging
The in-site installation personnel of system add work difficulty, often cause the product quality of birdcage coil that there is processor to be difficult to control
The hidden danger of system.
Present invention improves over birdcage coil general in magnetic resonance system, with the structure for being suitable for tuning, overcome above-mentioned
Shortcoming.
The content of the invention
The present invention proposes a kind of improved birdcage coil and its adjustment method for magnetic resonance imaging system, with line
Circle internal current is evenly distributed, debugs convenient advantage, reduces the work difficulty in field-mounted process.
The invention discloses a kind of birdcage coil for magnetic resonance imaging system, including it is distributed in upper on cylindrical surface
Ring shaped conductor, a plurality of linear conductor of lower ring shaped conductor and connection therebetween；In the upper ring shaped conductor and lower ring shaped conductor
It is in series with multiple capacitors；The whole of the linear conductor wherein has 1 section or 2 sections using the soft of flexible deformation
Property resonance line；When the flexible resonance line flexural deformation, the distance between the upper ring shaped conductor and lower ring shaped conductor change,
And change the resonant frequency of the birdcage coil
In another embodiment of the present invention, when the linear conductor is all using the flexibility of flexible
During resonance line, ring shaped conductor and/or lower ring shaped conductor on described are positioned adjacent to what the flexible resonance line occured bending and deformation.
In an embodiment of the present invention, when having 1 section or 2 sections of flexible resonance lines in the linear conductor, every section of institute
State flexible resonance line length be less than the linear conductor length 1/3rd when there is 1 section of flexible resonance line, institute
State flexible resonance line and be positioned adjacent to ring shaped conductor or lower ring shaped conductor on described in the linear conductor；When there is 2 sections of institutes
When stating flexible resonance line, position of the flexible resonance line in the linear conductor it is simultaneously neighbouring it is described on ring shaped conductor and under
Ring shaped conductor.
In one embodiment of the invention, the flexible resonance line is deformed into the shape of similar alphabetical " Ω " by being pre-bent
Shape.
In one embodiment, in addition to for the resonance for the position for changing the upper ring shaped conductor or lower ring shaped conductor
Point adjuster.
In one embodiment, the resonance point adjuster including more than one be fixed on the upper ring shaped conductor or under
Sliding block on ring shaped conductor, when each sliding block of uniform push-and-pull, the position of the upper ring shaped conductor or lower ring shaped conductor changes
Become.
The flexible resonance line is to use FPC flexible circuit board materials.
The invention also discloses it is a kind of for it is above-mentioned any one be used for magnetic resonance imaging system birdcage coil tuning
Method, comprises the following steps：By changing on described in the alteration of form of flexible resonance line between ring shaped conductor and lower ring shaped conductor
Distance, change the resonant frequency of the birdcage coil.
In one embodiment, the step of changing the distance between the upper ring shaped conductor and lower ring shaped conductor includes：Institute
Stating the step of changing upper the distance between ring shaped conductor and lower ring shaped conductor described in the alteration of form of the flexible resonance line includes：
Respectively comparably push-and-pull each be fixedly connected on the sliding block of the upper ring shaped conductor or the lower ring shaped conductor.
The present invention provides a kind of birdcage coil being used in magnetic resonance system and its adjustment method, by the annular of birdcage coil
Conductor design be transportable debugging ring, by change debug ring position come between two circular loop conductors above and below changing away from
From so as to adjust the resonant frequency of birdcage coil.The birdcage coil of the present invention avoids coming micro- using expensive tunable capacitor device
Modulation coil resonant frequency, reduces the cost of birdcage coil, and debug easily easy to use；Due to same step of the invention
The structure of whole birdcage coil, tuning range is than larger；And the distribution on coil current does not influence, coil inside is penetrated
Frequency magnetic field homogeneity is unaffected；The mechanical structure of the present invention is stable, can bear higher voltage, with higher reliable
Property.
Brief description of the drawings
Fig. 1 is a kind of structural representation of conventional birdcage coil in the prior art.
Fig. 2 is the structural representation of one embodiment of the birdcage coil of the present invention.
Fig. 3 and Fig. 4 are the structural representations of the coil tuning device in one embodiment of the present of invention.
Fig. 5 is the structural representation of resonance point adjuster in one embodiment of the invention.
Fig. 6 and Fig. 7 are the resonant frequency curves of corresponding diagram 3 and the coil tuning device in embodiment shown in Fig. 4 respectively.
Fig. 8 is the coil parameter schematic diagram of one embodiment of the invention.
Embodiment
The structure of the general birdcage coil of magnetic resonance system, as shown in figure 1, this conventional birdcage coil is put down using two
Capable ring shaped conductor, using many linear conductor connections between two ring shaped conductors, and assembles many on two ring shaped conductors
Individual electric capacity.
The flexible linear conductor of the present invention replaces the rigid linear conductor in traditional birdcage coil completely.That is, upper
Linear conductor between lower ring shaped conductor is flexible deformation, and so the distance between ring shaped conductor can be in core up and down
The erecting bed of magnetic resonance system is very easily adjusted as requested, so as to change the resonance point of birdcage coil, adapts to magnet
The requirement of static magnetic field strength.In one embodiment, flexible is limited by the packaging shell of radio-frequency sending coil to become
The deformation of the linear conductor of shape occurs near the close position of ring shaped conductor up and down, the radiofrequency field B so to the birdcage coil1
Uniformity influence it is minimum.
In another embodiment, one of those annular leading using flexibility between vertical conductor of birdcage coil
Line is connected, and the flexible wire allows the ring shaped conductor to be moved along the direction of extension of linear conductor, passes through this movement
To change the structure of coil so as to changing the resonance point of coil so that coil can with resonance in the frequency of magnetic resonance system,
During adjustment, whole ring shaped conductor is abreast moved along identical direction simultaneously, therefore the change of the distribution to coil
It is synchronous, so the uneven change of electric current will not be caused, therefore the radio frequency electromagnetic field that birdcage coil is produced is also uniform.
It is the structural representation of one embodiment of the birdcage coil of the present invention as shown in Figure 2.Radio frequency hair including cylindricality
Penetrate solenoid housing 011, upper ring shaped conductor 013 and the lower ring shaped conductor being fixedly mounted on the cylinder of radio-frequency sending coil housing 011
018, it is fixedly mounted between ring shaped conductor up and down on the cylinder of radio-frequency sending coil housing 011 and parallel to many of its axis
Individual linear conductor 017, the flexible resonance line 015 for electrically connecting and being electrically connected with linear conductor 017 with upper ring shaped conductor 013 respectively,
Each linear conductor 017 is also electrically connected in lower ring shaped conductor 018, and the He of ring shaped conductor 013 above and below being separately mounted to
Electric capacity 016 in 018.It is located on radio-frequency sending coil housing 011 on the end face above upper ring shaped conductor and is provided with multiple adjustment holes
012, resonance point adjuster 014 can be operated by the adjustment hole 012, resonance point adjuster 014 is used to adjust ring shaped conductor
013 relative to lower ring shaped conductor 018 position, it is soft when upper ring shaped conductor 013 is farthest apart from the position of lower ring shaped conductor 018
Property resonance line 015 stretch extension, when upper ring shaped conductor 013 is nearest apart from the position of lower ring shaped conductor 018, flexible resonance line
015 bending shortens.
Birdcage coil as shown in Figure 2, including 16 linear conductors 017, wherein upper ring shaped conductor 013 is as regulation ring,
That is upper ring shaped conductor 013 can be moved up and down on radio-frequency sending coil housing 011.Will by flexible resonance line 015
Upper ring shaped conductor 013 is connected on linear conductor 017, is then mounted with resonance point adjuster 014 on upper ring shaped conductor 013,
This resonance point adjuster 014 includes to promote or pulling the sliding block of ring shaped conductor 013.For the ease of regulation, 011
The product can be installed in 4 adjustment holes 012, production or installation process by being devised on the end face of radio-frequency sending coil housing
After good, the sliding block of resonance point adjuster 014 is adjusted from adjustment hole 012 with screw driver, the scope of sliding block movement depends on and spiral shell
The length of bolt.
In an embodiment of the invention, the structure of flexible resonance line 015 is not the ring shaped conductor for being only applied only to one side
On, but this structure is all used in the ring shaped conductor of both sides up and down.I.e. upper ring shaped conductor 013 and lower ring shaped conductor 018 are same
Shi Zuowei regulation rings, so as to increase the adjustable range of resonance point, and equally configure multiple resonance point adjusters 014.
The present invention can not only be applied on the above-mentioned birdcage coil with 16 linear conductor structures, to other structures
Birdcage coil be all suitable for.Such as there is the birdcage coil of 4 linear conductor structures, or with 8 linear conductor structures
Birdcage coil etc..
It is the structural representation of the coil tuning device in one embodiment of the present of invention as shown in Figure 3 and Figure 4.Fig. 3 and 4
In connected in upper ring shaped conductor 013 electric capacity 016；Flexible resonance line 015 between upper ring shaped conductor 013 and linear conductor 017,
Resonance point adjuster 014 is fixedly connected with housing and upper ring shaped conductor 013, Fig. 3 flexible resonance line 015 and extended configuration is presented, this
When on ring shaped conductor 013 apart from radio-frequency sending coil housing 011 end face recently, the position apart from linear conductor 017 is farthest, away from
It is also farthest from the lower (not shown) of ring shaped conductor 018；Conversely, the flexible bending of resonance line 015 shortens in Fig. 4, now upper annular is led
Body 013 is farthest apart from the end face of radio-frequency sending coil housing 011, apart from the position of linear conductor 017 recently, is led apart from lower annular
The (not shown) of body 018 is also nearest.
Flexible resonance line 015 is predisposed to the shape of alphabetical " Ω ", and it is advantageous in that, when flexible resonance line is compressed
, it is necessary to which the elastic force overcome is all smaller when shortening or stretching elongated, it is easy to fixed after adjustment, so that have adjusted resonance frequency
The birdcage coil performance of rate is stable.
It is the structural representation of resonance point adjuster 014 in one embodiment of the invention shown in Fig. 5.Radio-frequency sending coil shell
There is adjustment hole 012 on the end face of body 011, there is regulating bolt 0142 in adjustment hole 012, sliding block 0141 is fixed on ring shaped conductor
On 013, regulating bolt 0142 can adjust the position for changing upper ring shaped conductor with push-and-pull sliding block.
It is the resonance frequency of corresponding diagram 3 and the coil tuning device in embodiment shown in Fig. 4 respectively as shown in Figure 6 and Figure 7
Rate curve.Transverse axis is frequency in figure, and it in the frequency response of coil, figure per lattice is 5db that the longitudinal axis, which is,.When the state of resonance point adjuster
When as shown in Figure 3, the resonance point of the radio-frequency sending coil in the embodiment is located at 63.73MHz, and frequency response is 22.454db.
When the state of resonance point adjuster is as shown in Figure 4, the resonance point of the radio-frequency sending coil in the embodiment is located at 63.95MHz,
Frequency response is 22.692db.It can be seen that resonance point adjuster of the invention causes the 16 line birdcage coil to have in erecting bed
220KHz adjustable range.
It is the parameter schematic diagram of the present invention as shown in Figure 8.In one embodiment of the invention, radio frequency birdcage transmitting coil
It is connected to 16 linear conductors between upper and lower ring shaped conductor, 740 millimeters of the coil height, 600 millimeters of coil diameter, upper,
Lower ring shaped conductor and linear conductor, which are used, distinguishes 16 groups of electric capacity of each series connection in the copper foil of 30 millimeters of width, upper and lower ring shaped conductor, often
Group is using two 47pf electric capacity.(Flexible Printed Circuit are soft using FPC flexible circuit board materials for flexible resonance line
Property printed circuit board (PCB) abbreviation FPC), length is 30 millimeters, to the shape that flexible PCB predeformation is alphabetical " Ω " before welding, so
After be welded between ring shaped conductor and linear conductor.The sliding block adjustable extent of resonance point adjuster is 20 millimeters, in coil
Heart resonance point is 63.86 megahertzs, and the adjustable extent of resonance point is positive and negative 100 KHz.
Claims (10)
1. a kind of birdcage coil for magnetic resonance imaging system, including upper ring shaped conductor, the lower ring being distributed on cylindrical surface
The linear conductor of shape conductor and connection therebetween；Capacitor is in series with the upper ring shaped conductor and lower ring shaped conductor；It is special
Levy and be, the whole of the linear conductor or the flexible resonance line for wherein thering is 1 section or 2 sections use flexible to deform；
When the flexible resonance line flexural deformation, the distance between the upper ring shaped conductor and lower ring shaped conductor change, and change institute
State the resonant frequency of birdcage coil.
2. birdcage coil as claimed in claim 1, it is characterised in that when the whole of the linear conductor uses flexible
During the flexible resonance line of deformation, what the flexible resonance line occured bending and deformation the be positioned adjacent to upper ring shaped conductor or
Lower ring shaped conductor.
3. birdcage coil as claimed in claim 1, it is characterised in that when have in the linear conductor 1 section or 2 sections it is described soft
Property resonance line when, the length of every section of flexible resonance line is less than 1/3rd of the length of the linear conductor；When there is 1 section of institute
When stating flexible resonance line, the flexible resonance line is positioned adjacent to ring shaped conductor or lower ring on described in the linear conductor
Shape conductor；When there is 2 sections of flexible resonance lines, position of the flexible resonance line in the linear conductor is simultaneously adjacent to institute
State ring shaped conductor and lower ring shaped conductor.
4. the birdcage coil as described in claim 3 or 2, it is characterised in that the flexible resonance line is pre-bent deformation
For the shape of similar alphabetical " Ω ".
5. birdcage coil as claimed in claim 4, it is characterised in that also including for change the upper ring shaped conductor or under
The resonance point adjuster of the position of ring shaped conductor.
6. birdcage coil as claimed in claim 5, it is characterised in that the resonance point adjuster is fixed on including more than one
Sliding block on the upper ring shaped conductor or lower ring shaped conductor, when each sliding block of uniform push-and-pull the upper ring shaped conductor or
The position of ring shaped conductor changes under person.
7. birdcage coil as claimed in claim 6, it is characterised in that the position of the upper ring shaped conductor or lower ring shaped conductor
Adjustable extent is 20 millimeters.
8. birdcage coil as claimed in claim 1, it is characterised in that the flexible resonance line uses FPC flexible circuit sheet materials
Material.
9. any one a kind of being used for as described in claim 1 to 8 is used for the tuning of the birdcage coil of magnetic resonance imaging system
Method, it is characterised in that comprise the following steps：By changing upper ring shaped conductor and lower ring described in the alteration of form of flexible resonance line
The distance between shape conductor, changes the resonant frequency of the birdcage coil.
10. the tuning methods of birdcage coil as claimed in claim 9, it is characterised in that the change flexible resonance line
Alteration of form described in upper the distance between ring shaped conductor and lower ring shaped conductor the step of include：Respectively comparably push-and-pull each
It is fixedly connected on the sliding block of the upper ring shaped conductor or the lower ring shaped conductor.
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