CN110109035A - Birdcage coils decoupling device, birdcage coils decoupled system and magnetic resonance system - Google Patents
Birdcage coils decoupling device, birdcage coils decoupled system and magnetic resonance system Download PDFInfo
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- CN110109035A CN110109035A CN201910323537.4A CN201910323537A CN110109035A CN 110109035 A CN110109035 A CN 110109035A CN 201910323537 A CN201910323537 A CN 201910323537A CN 110109035 A CN110109035 A CN 110109035A
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- birdcage coils
- combiner
- port
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- decoupling device
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- 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
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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
-
- 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
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
-
- 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
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
Abstract
This application involves a kind of birdcage coils decoupling device, birdcage coils decoupled system and magnetic resonance systems.Wherein, the birdcage coils decoupling device realizes the decoupling of multi-coil port birdcage coils by the way that multiple combiner head and the tail birdcage coils decoupling device in series is arranged.In addition, each coil port can be with the phase and amplitude of individual control signal, so that the uniformity in the RF excited magnetic field that birdcage coils generate is higher.
Description
Technical field
This application involves magnetic resonance field of medical technology, more particularly to a kind of birdcage coils decoupling device, birdcage
Coil decoupled system and magnetic resonance system.
Background technique
Birdcage-type radio frequency coil, also referred to as birdcage coils, principle using being LC standing wave resonance, uniformly penetrate by generation
Frequency excitation field, to be used for magnetic resonance excitation.In the use process of birdcage coils, pass through two feeds of birdcage coils
Port carries out the feed-in of power signal, the radiofrequency signal that input phase difference is 90 degree, to generate entelechy magnetizing field.Feed placement
It is generally positioned on the capacitor of two quadrature positions setting of birdcage coils end ring, therefore the birdcage coils of two feed ports
It is naturally decoupling, the isolation of power signal between two feed ports can be realized by not needing additional decoupling device.
However, having the birdcage coils of more than two feed ports, such as four port birdcage coils, multiple feed ends
There are the close coupling of signal effects between mouthful.If do not decoupled to birdcage coils, the power letter in feed port is inputted
Number it can be coupled to another power amplifier from a power amplifier, so that birdcage coils work efficiency drop, very
It can extremely lead to the problem of and damage other power sources.
In traditional scheme, there is no the molding decoupling methods and decoupling device for being directed to multiport birdcage coils.
Summary of the invention
Based on this, it is necessary to which, in traditional scheme, there is no the molding decouplings for being directed to multiport birdcage coils
The problem of method and decoupling device, provides a kind of birdcage coils decoupling device, birdcage coils decoupled system and magnetic resonance system
System.
The application provides a kind of birdcage coils decoupling device, is used cooperatively with birdcage coils, the birdcage coils
Decoupling device is electrically connected with the birdcage coils and power supply respectively.In one embodiment, the birdcage coils
Decoupling device includes:
Combiner unit, the combiner unit include multiple combiners, the conjunction in series of the multiple combiner head and the tail
Road unit；
The input terminal of the combiner unit is electrically connected with the power supply, the function generated for receiving the power supply
Rate signal；
The output end of the combiner unit is electrically connected with the birdcage coils, is used for the power signal transmissions and is divided
Multiple coil ports of the birdcage coils are assigned to, to realize the decoupling of the birdcage coils.
In the present embodiment, by the way that multiple combiner head and the tail birdcage coils decoupling device in series is arranged, realize
The decoupling of multi-coil port birdcage coils.In addition, each coil port can with the phase and amplitude of individual control signal so that
The uniformity for the RF magnetic field that birdcage coils generate is higher.
The application also provides a kind of birdcage coils decoupled system.In one embodiment, the birdcage coils solution
Coupling system includes:
Power supply, for generating power signal；
Such as the birdcage coils decoupling device that foregoing teachings refer to, the input terminal of the birdcage coils decoupling device and institute
Power supply electrical connection is stated, the power signal generated for receiving the power supply；
Birdcage coils, have multiple coil ports, the birdcage coils by the multiple coil port with it is described
The output end of birdcage coils decoupling device is electrically connected；
The birdcage coils decoupling device is also used to the power signal transmissions and distributes to the birdcage coils
Multiple coil ports, to realize decoupling to the birdcage coils.
In the present embodiment, by the way that the bird being made of power supply, birdcage coils and birdcage coils decoupling device is arranged
Birdcage coil structural system realizes the decoupling to multi-coil port birdcage coils.In addition, each coil port can be independent
The phase and amplitude of signal is controlled, so that the uniformity for the RF magnetic field that birdcage coils generate is higher.
The application also provides a kind of magnetic resonance system based on birdcage coils structure.In one embodiment, described
Magnetic resonance system based on birdcage coils structure includes:
Radio-frequency module, including birdcage coils；The birdcage coils are for generating RF magnetic field；
Gradient modules, including gradient coil；The gradient coil is set in the outside of the birdcage coils, the gradient
Coil is for generating gradient magnetic；
Magnetic body module is set in the outside of the gradient coil, for generating main field；
It such as the birdcage coils decoupling device that foregoing teachings refer to, is electrically connected with the birdcage coils, for described
Birdcage coils execute decoupling operation；
Power supply is electrically connected with the birdcage coils decoupling device, for generating power signal and by the power
Signal is sent to the birdcage coils decoupling device；
Controller is electrically connected with the birdcage coils decoupling device and/or the gradient modules, for controlling described penetrate
Frequency module generates the RF magnetic field and/or the gradient modules generate the gradient magnetic；
Host computer is communicated to connect with the controller, for instructing to controller transmitting scanning sequence, to control magnetic
Resonance system operation and generation magnetic resonance image.
In the present embodiment, there is the magnetic resonance system of birdcage coils decoupling device by being arranged, realize multi-coil end
The decoupling of mouth birdcage coils, so that entire magnetic resonance system normal operation.Further, since the feed port number of birdcage coils
Amount increases, and the quantity of the power amplifier in power supply is also increase accordingly, to reduce the maximum every power amplifier
Output power alleviates load pressure for power amplifier.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the birdcage coils decoupling device provided in one embodiment of the application；
Fig. 2 is the usage state diagram of the birdcage coils decoupling device provided in one embodiment of the application；
Fig. 3 is the structural schematic diagram of the birdcage coils decoupling device provided in one embodiment of the application；
Fig. 4 be in one embodiment of the application in the birdcage coils decoupling device that provides multiple coil ports in birdcage line
Enclose the distribution schematic diagram of top ring；
Fig. 5 is the birdcage coils decoupling device applied to four port birdcage coils provided in one embodiment of the application
Structural schematic diagram；
Fig. 6 is the birdcage coils decoupling device applied to four port birdcage coils provided in one embodiment of the application
Usage state diagram；
Fig. 7 is the structural representation in the birdcage coils decoupling device provided in one embodiment of the application with frequency combiner
Figure；
Fig. 8 is the birdcage coils decoupling device applied to three port birdcage coils provided in one embodiment of the application
Structural schematic diagram；
Fig. 9 is the structural schematic diagram of the birdcage coils decoupled system provided in one embodiment of the application；
Figure 10 is that the signal of the birdcage coils decoupled system provided in one embodiment of the application transmits schematic diagram；
Figure 11 is to provide the structural schematic diagram of the magnetic resonance system based on birdcage coils structure in one embodiment of the application.
Appended drawing reference:
10 birdcage coils decoupled systems
20 magnetic resonance systems based on birdcage coils structure
100 birdcage coils decoupling devices
110 combiner units
111 combiners
111a combiner input port
111b combiner output port
The input terminal of 112 combiner units
The output end of 113 combiner units
114 first combiners
114a first input port
The second input port of 114b
The first output port of 114c
114d second output terminal mouth
115 second combiners
115a third input port
The 4th input port of 115b
115c third output port
The 4th output port of 115d
116 third combiners
The 5th input port of 116a
The 6th input port of 116b
The 5th output port of 116c
The 6th output port of 116d
117 the 4th combiners
The 7th input port of 117a
The 8th input port of 117b
The 7th output port of 117c
The 8th output port of 117d
118 the 5th combiners
The 9th input port of 118a
The tenth input port of 118b
The 9th output port of 118c
The tenth output port of 118d
119 the 6th combiners
The 11st input port of 119a
The 11st input port of 119b
The 12nd output port of 119c
The 12nd output port of 119d
200 birdcage coils
210 coil ports
300 power supplies
400 radio-frequency modules
500 gradient modules
600 magnetic body modules
700 controllers
800 host computers
900 auxiliary circuits
910 radio circuits
920 radio-frequency power amplifiers
930 analog-digital converters
Specific embodiment
In order to make the purpose of the application, technical solution and advantage are more clearly understood, right with reference to the accompanying drawings and embodiments
Birdcage coils decoupling device 100, birdcage coils decoupled system 10 and magnetic resonance system 20 provided by the present application are carried out into one
Step is described in detail.It should be appreciated that specific embodiment described herein is not used to limit this Shen only to explain the application
Please.
The application provides a kind of birdcage coils decoupling device 100.The birdcage coils decoupling device 100 and birdcage
Coil 200 is used cooperatively.The birdcage coils decoupling device 100 respectively with the birdcage coils 200 and power supply 300
Electrical connection.The birdcage coils 200 are not intended to limit its type.The birdcage coils 200 can for high pass birdcage formula coil,
One of low pass birdcage coils and band logical birdcage coils.The birdcage coils 200 are for emitting radio-frequency pulse, to produce
Raw RF magnetic field (i.e. B1).The power supply 300 is used to provide power supply for the birdcage coils decoupling device 100.It changes
Yan Zhi, the power supply 300 send power letter for generating power signal, and to the birdcage coils decoupling device 100
Number.
As depicted in figs. 1 and 2, in the embodiment of the application, the birdcage coils decoupling device 100 includes combining
Unit 110.The combiner unit 110 includes multiple combiners 111.The multiple 111 head and the tail conjunction in series of combiner
Road unit 110.The input terminal 112 of the combiner unit 110 is electrically connected with the power supply 300.The combiner unit 110
Input terminal 112 is used to receive the power signal that the power supply 300 generates.The output end 113 of the combiner unit 110 and institute
State the electrical connection of birdcage coils 200.The output end 113 of the combiner unit 110 is used for the power signal transmissions and distributes
To multiple coil ports 210 of the birdcage coils 200, to realize the decoupling to the birdcage coils 200.
Specifically, the birdcage coils 200 are multiport birdcage coils.That is, the coil of the birdcage coils 200
The quantity of port 210 is greater than 2.Multiple coil ports 210, the coil port 210 are provided in the birdcage coils 200
Referred to as feed port.The multiple coil port 210 is set on the capacitor of the birdcage coils 200.Each described electricity
Appearance is correspondingly arranged on the coil port 210.By the way that the input of the multiple coil port 210, there are phase differences respectively
Power signal, so that the birdcage coils 200 generate circular polarisation RF magnetic field.
In the use process of the birdcage coils decoupling device 100, the power supply 300 generates power signal,
And the power signal is input to the input terminal 112 of the combiner unit 110.The power signal passes through the multiple combining
Device 111 generates phase offset and/or amplitude variation, and there are phase difference and/or the power signals of difference in magnitude to different lines for output
Enclose port 210.By the way that the combiner unit 110 is arranged, so that avoiding multiple lines in the transmission process of entire power signal
The power signal enclosed between port 210 generates the generation of coupling phenomenon.In other words, the birdcage coils decoupling device 100 is real
The decoupling to multiport birdcage coils signals transmission is showed.
In the present embodiment, by the way that multiple 111 head and the tail of combiner birdcage coils decoupling device 100 in series is arranged,
Realize the decoupling of 210 birdcage coils of multi-coil port.In addition, each coil port 210 can be with the phase of individual control signal
Position and amplitude, so that the uniformity for the RF magnetic field that birdcage coils 200 generate is higher.
As shown in figure 3, each described combiner 111 includes at least one combiner in the embodiment of the application
Input port 111a and at least one combiner output port 111b.At least one described combiner input port 111a and described
A part of port at least one combiner output port 111b is for realizing the connection between the different combiners 111.
Another part end at least one described combiner input port 111a and at least one combiner output port 111b
Mouthful, the output end 113 for input terminal 112 and the combiner unit 110 as the combiner unit 110.
Specifically, the combiner input port 111a of each combiner 111 can be multiple.The combiner is defeated
Exit port 111b can be multiple.To avoid port from wasting, the multiple combiner input port 111a and the multiple combining
A part in device output port 111b is for the series connection between the different combiners 111.The multiple combiner input terminal
Input terminal 112 of the another part as the combiner unit 110 in mouth 111a and the multiple combiner output port 111b
It is with the output end 113 of the combiner unit 110, i.e., electric for distinguishing with the birdcage coils 200 and the power supply 300
Connection.
In the present embodiment, pass through combiner input port 111a described in reasonable distribution and the combiner output port 111b
Purposes not only realized the connection between the combiner 111, but also realize combiner 111 while avoiding port from wasting
With the connection of the birdcage coils 200 and the power supply 300.
Please continue to refer to Fig. 3, in the embodiment of the application, each described combiner 111 includes two conjunctions
Road device input port 111a and two combiner output port 111b.
Specifically, two combiner input port 111a can be set in one end of the combiner 111.Two combiners
Output port 111b can be set in the other end of the combiner 111.
It include two combiner input port 111a and two conjunctions by the way that each combiner 111 is arranged in the present embodiment
Road device output port 111b, port number may be implemented to maximally utilize.Port number not only will not be excessive and generation wastes, but also can
To guarantee normal component connection requirement.
Please continue to refer to Fig. 3, in the embodiment of the application, the power supply 300 is multiple.The multiple combining
The sum of quantity of combiner input port 111a of device 111 is equal to two times of the quantity of the power supply 300.The multiple conjunction
The sum of quantity of combiner output port 111b of road device 111 is equal to two times of the quantity of the coil port 210.
Specifically, power supply 300 described in the present embodiment is multiple, and coil port 210 is also multiple.Combiner input
The quantity summation of port 111a is equal to two times of the quantity of the power supply 300, can both meet the power supply 300
Connection requirement, and meet the connection requirement between the multiple combiner 111.Similarly, the quantity of combiner output port 111b
Summation is equal to two times of the quantity of the coil port 210, can not only meet the connection requirement of the birdcage coils 200, but also
Meet the connection requirement between the multiple combiner 111.
In the present embodiment, the sum of the quantity of the combiner input port 111a by the way that the multiple combiner 111 is arranged, with
And the particular number of the sum of quantity of combiner input port 111a of the multiple combiner 111, it can both meet the bird
The connection requirement of birdcage coil 200 and the power supply 300, and meet the connection requirement between the multiple combiner 111.
Please continue to refer to Fig. 3, in the embodiment of the application, the quantity of the power supply 300 is four.The line
The quantity for enclosing port 210 is four.The combiner unit 110 includes four combiners 111.Each described combiner
111 include two combiner input port 111a and two combiner output port 111b.
Specifically, the birdcage coils decoupling device 100 in the present embodiment is applied to the decoupling of four port birdcage coils.
Four port birdcage coils have four coil ports 210.Four port birdcage coils include top ring, lower end
Ring, and the metal leg being connected between the top ring and the lower loop.Four coil ports 210 are in four port bird
Arrangement mode in birdcage coil can be without limitation.Optionally, as shown in figure 4, four coil ports 210 can be set at equal intervals
It is placed in the top ring of four port birdcage coils.
Combiner quantity, 210 quantity of coil port and 300 quantity of power supply in the present embodiment is equal, and is four
It is a.Each described combiner 111 includes two combiner input port 111a and two combiner output ports
111b.It is appreciated that the total quantity of the combiner input port 111a is eight.The combiner output port 111b's is total
Quantity is eight.Wherein, four combiner input port 111a are for being separately connected four power supplies 300.Four institutes
State four coil ports 210 of the combiner output port 111b for being separately connected in the birdcage coils of four port.It is remaining
Four combiner input port 111a and four combiner output port 111b are between four combiners 111
Connection.The reasonable quantity of the combiner input port 111a and combiner output port 111b in the present embodiment, can be both
Meet the connection requirement of four port birdcage coils Yu the power supply 300, but meet the multiple combiner 111 it
Between connection requirement.
It is equal by setting combiner quantity, 210 quantity of coil port and 300 quantity of power supply in the present embodiment, and
It is four, realizes the matching with four port birdcage coils.Both four port birdcage coils and the power supply had been met
The connection requirement of power supply 300, and meet the connection requirement between the multiple combiner 111.The present embodiment birdcage wire type coil
Including four input ports, and between four input ports, there are 90 degree, the phase offsets of 180 degree, using birdcage coils
Decoupling device 100 can realize the decoupling in four port birdcage coils between each coil port 210, avoid the mutual of power signal
Interference.
As shown in Figure 5 and Figure 6, in the embodiment of the application, the combiner unit 110 include the first combiner 114,
Second combiner 115, third combiner 116 and the 4th combiner 117.First combiner 114 includes first input port
114a, the second input port 114b, the first output port 114c and second output terminal mouth 114d.Second combiner 115 wraps
Include third input port 115a, the 4th input port 115b, third output port 115c and the 4th output port 115d.Described
Three combiners 116 include the 5th input port 116a, the 6th input port 116b, the 5th output port 116c and the 6th output end
Mouth 116d.4th combiner 117 includes the 7th input port 117a, the 8th input port 117b, the 7th output port
117c and the 8th output port 117d.
The first input port 114a, the second input port 114b, the 5th input port 116a and described
6th input port 116b is electrically connected with a power supply 300 respectively, the input terminal as the combiner unit 110
112。
The third output port 115c, the 4th output port 115d, the 7th output port 117c and described
8th output port 117d is electrically connected with a coil port 210 respectively, the output end as the combiner unit 110
113。
The first output port 114c is electrically connected with the third input port 115a, the 4th input port 115b
It is electrically connected with the 5th output port 116c, the 6th output port 116d and the 8th input port 117b is electrically connected
It connects, the 7th input port 117a is electrically connected with the second output terminal mouth 114d.
Above content is that the specific connection of the birdcage coils decoupling device 100 applied to four port birdcage coils is closed
System.Theoretical point is carried out to the decoupling feasibility for the birdcage coils decoupling device 100 for being applied to four port birdcage coils below
Analysis.
The four port birdcage coils not decoupled to one set its scattering parameter matrix as Sa, SaFor a quaternary battle array
Column.The birdcage coils decoupling device 100 for being applied to four port birdcage coils (is hereinafter the bird in the present embodiment
Birdcage coil decoupling device 100 is separately connected with four coil ports 210 in the birdcage coils of four port.It can be considered as
Birdcage coils decoupling device 100 in the present embodiment is connect with the four-element array.SaMatrix shape it is as shown in formula 1.
The S parameter of birdcage coils decoupling device 100 in the present embodiment can be expressed as formula 2.
[S]8×8Formula 2
The scattering parameter of birdcage coils decoupling device 100 in the present embodiment can be expressed as formula 3.
The scattering parameter of birdcage coils decoupling device 100 in the present embodiment can also be expressed as formula 4.
By above-mentioned formula, what birdcage coils decoupling device 100 and array in available the present embodiment mixed dissipates
Penetrate parameter matrix Sc, as shown in formula 5.
Sc=Smm+Smn[(Sa)-1-Snn]-1Snm(m=1,2,3,4.n=5,6,7,8) formula 5
Assuming thatThe then mixed scattering parameter matrix ScIt can be expressed as formula 6.
Wherein, λ is SaCharacteristic value.Due to birdcage coils 200 have structural symmetry, available formula 7 it is interior
Hold.
And then λ is calculated by formula 81、λ2、λ3And λ4。
By above-mentioned formula, matrix S is obtainedaThe conclusion of diagonalization decouples to get the birdcage coils in the present embodiment out
The conclusion of decoupling may be implemented between four input ports connecting with power supply 300 in device 100.In other words, it obtains
The first input port 114a, the second input port 114b, the 5th input port 116a and the 6th input
The conclusion of decoupling may be implemented between the 116b of port.
Further, Smn=[e1 e2 e3 e4], wherein e is scattering parameter matrix SaOrthogonal assertive evidence vector.Setting is just
Hand over assertive evidence vector are as follows:
To sum up, if the first input port 114a, the second input port 114b, the 5th input port 116a
Decoupling is realized between the 6th input port 116b, the scattering parameter matrix need to meet the condition of formula 10.
Therefore formula 11 is obtained.
To sum up, it was demonstrated that the decoupling of four port birdcage coils is feasible, and first combiner 114, second is combined
It needs to meet formula 11 after device 115, third combiner 116 and the 4th combiner 117 combination.
The present embodiment realizes the decoupling in four port birdcage coils between each coil port 210, avoids power signal
Interfere with each other.
In the embodiment of the application, the combiner 111 is same frequency combiner.
Specifically, the combiner 111 can be same frequency combiner.The same frequency combiner is also known as 3dB electric bridge, knot
Structure is as shown in Figure 7.As shown in fig. 7, the same frequency combiner includes the port a, the port b, the port c and the port d.The port a and the port d
For input port.The port b and the port c are output port.The distribution of the power signal equity inputted from the port a is to the port b and the end c
Mouthful.There is 90 degree of phase offset between the port c of the port b.And the port d is not coupled to from the power signal that the port a inputs.Together
Reason, the distribution of the power signal equity inputted from the port d is to the port b and the port c.And do not have from the power signal that the port d inputs
It is coupled to the port a.The port a and the port d can be two sections with the power signal that simultaneous transmission power signal, the port b and the port c obtain
The superposition of power signal.
The embodiment of birdcage decoupling device based on four port birdcage coils, the s-matrix of the same frequency combiner is such as
Formula 12 is just met for the demand of four port birdcage coils decoupling.
In the present embodiment, it is same frequency combiner by the way that the combiner 111 is arranged, passes through the group of multiple same frequency combiners
It closes, can satisfy the demand of multiport birdcage coils decoupling.
In addition to four port birdcage coils, the birdcage coils decoupling device provided by the present application can also be applied to appoint
The multiport birdcage coils for coil port quantity of anticipating.
In an alternative embodiment, first combiner 114, second combiner 115, third combining
It is also provided between device 116 and the 4th combiner 117 and the power supply 300 with circuit.The match circuit makes
Obtain the power signal one-way flow that power supply 300 produces.That is: the power that the described match circuit produces the power supply 300
Signal can not and be secondary use.In this particular embodiment, between first combiner 114 and the power supply 300
Settable first match circuit.Settable second match circuit between second combiner 115 and the power supply 300.
Settable third match circuit between the third combiner 116 and the power supply 300.4th combiner 117 with
Settable 4th match circuit between the power supply 300.Certainly in other embodiments, first combiner 114, institute
Stating the second combiner 115, the third combiner 116 and the corresponding power supply of the 4th combiner 117 can be difference
It is independent.
Fig. 8 is the birdcage coils decoupling device applied to three port birdcage coils that one embodiment of the application provides
100 structural schematic diagram.
In the embodiment of the application, as shown in figure 8, the birdcage coils for being applied to three port birdcage coils decouple
Device 100 includes two 111: the five combiners 118 of combiner and the 6th combiner 119.5th combiner 118 includes the
Nine input port 118a, the tenth input port 118b, the 9th output port 118c and the tenth output port 118d.The six directions
Road device 119 is defeated including the 11st input port 119a, the 12nd input port 119b, the 11st output port 119c and the 12nd
Exit port 119d.
The 9th input port 118a, the tenth input port 118b and the 12nd input port 119b respectively with an institute
State the electrical connection of power supply 300, the input terminal 112 as the combiner unit 110.
The 9th output port 118c, the 11st output port 119c and the 12nd output port 119d points
It is not electrically connected with a coil port 210, the output end 113 as the combiner unit 110.
The tenth output port 118d is electrically connected with the 11st input port 119a.
The present embodiment realizes the decoupling in three port birdcage coils between each coil port 210, avoids power signal
Interfere with each other.
The application also provides a kind of birdcage coils decoupled system 10.
As shown in Figure 9 and Figure 10, in the embodiment of the application, the birdcage coils decoupled system 10 includes power supply
Power supply 300, birdcage coils decoupling device 100 and birdcage coils 200.The input of the birdcage coils decoupling device 100
End is electrically connected with the power supply 300.The output end of the birdcage coils decoupling device 100 and the birdcage coils
200 multiple coil ports 210 are electrically connected.The power supply 300 is for generating power signal.The birdcage decoupling device
The power signal generated for receiving the power supply 300.The birdcage decoupling device is also used to the power signal
It transmits and distributes to multiple coil ports 210 of the birdcage coils 200, to realize the solution to the birdcage coils 200
Coupling.
Fig. 9 is the structural schematic diagram of the birdcage coils decoupled system 10.Figure 10 is birdcage coils decoupling system
The signal of system 10 transmits schematic diagram.
In the present embodiment, by being arranged by power supply 300, birdcage coils 200 and birdcage coils decoupling device 100
The birdcage coils structural system of composition, realizes the decoupling to 210 birdcage coils of multi-coil port.In addition, each coil
It port 210 can be with the phase and amplitude of individual control signal, so that the uniformity for the RF magnetic field that birdcage coils 200 generate is more
It is high.
The application also provides a kind of magnetic resonance system 20 based on birdcage coils structure.
As shown in figure 11, in the embodiment of the application, the magnetic resonance system 20 based on birdcage coils structure
The birdcage coils decoupling device referred to including radio-frequency module 400, gradient modules 500, magnetic body module 600, such as foregoing teachings
100, power supply 300, controller 700 and host computer 800.
The radio-frequency module 400 includes birdcage coils 200.The birdcage coils 200 are for generating RF magnetic field.Institute
Stating gradient modules 500 includes gradient coil 510.The gradient coil 510 is set in the outside of the birdcage coils 200.Institute
Gradient coil 510 is stated for generating gradient magnetic.The magnetic body module 600 is arranged the outside of the gradient coil 510.The magnetic
Module 600 is for generating main field.The birdcage coils decoupling device 100 is electrically connected with the birdcage coils 200.Institute
Birdcage coils decoupling device 100 is stated for executing decoupling operation to the birdcage coils 200.The power supply 300 with
The birdcage coils decoupling device 100 is electrically connected.The power supply 300 is for generating power signal and believing the power
Number it is sent to the birdcage coils decoupling device 100.The controller 700 and the birdcage coils decoupling device 100 and/
Or the gradient modules 500 are electrically connected.The controller 700 generates the RF magnetic field for controlling the radio-frequency module 400
And/or the gradient modules 500 generate the gradient magnetic.The host computer 800 is communicated to connect with the controller 700.Institute
Host computer 800 is stated for the controller 700 transmitting scanning sequence instruction, magnetic resonance system to be run and generation magnetic is total to control
Shake image.
Please continue to refer to Fig. 9, in the embodiment of the application, the magnetic resonance system based on birdcage coils structure
20 further include auxiliary circuit 900.The auxiliary circuit 900 turns including radio circuit 910, radio-frequency power amplifier 920 and modulus
Parallel operation 930.The radio circuit 910 is electrically connected with the birdcage coils decoupling device 100.The radio-frequency power amplifier
920 one end is electrically connected with the radio circuit 910.The other end for stating radio-frequency power amplifier 920 and the controller
700 electrical connections.One end of the analog-digital converter 930 is electrically connected with the birdcage coils decoupling device 100.The modulus turns
The other end of parallel operation 930 is electrically connected with the controller 700.
Specifically, the magnetic body module 600 is for generating main field.The gradient modules 500 include 510 He of gradient coil
Gradient current amplifier 520 (AMP).The gradient coil 510 includes the gradient coil in tri- directions x, y and z.Radio-frequency module
400 further include radiofrequency emitting module and Receiver Module (not shown).The controller 700 can be spectrometer module.
The spectrometer module includes pulse-series generator, gradient waveform generator, in transmitter and receiver (not shown)
It is one or more.The host computer 800 can be computer module.The computer module is for controlling magnetic resonance system operation
With final magnetic resonance imaging.
The process step of magnetic resonance imaging are as follows:
S100, scanning sequence (scan sequence) instruction that the computer module storage and transmission need to be implemented is extremely
The spectrometer module.
S200, the pulse-series generator in the spectrometer module are instructed according to the scanning sequence to the gradient
Waveform generator and the transmitter are controlled, and the gradient waveform generator output has the gradient of scheduled timing and waveform
Pulse signal.
S300, the gradient pulse signal pass through the gradient current amplifier 520 in tri- directions Gx, Gy and Gz, then pass through
Three autonomous channels Gx, Gy, Gz in the gradient modules 500, each gradient current amplifier excite right in gradient coil set
One answered the gradient coil 510, generates the gradient magnetic for generating additional space encoded signal, to magnetic resonance signal
Carry out space orientation.
S400, the pulse-series generator in the spectrometer module also execute scanning sequence, and output includes radio-frequency transmissions
The length of the timing of the data such as timing, intensity, the shape of radio-frequency pulse and radio frequency reception and data acquisition window is to the hair
Penetrate machine.
The radio-frequency pulse is sent to the birdcage coils in the radio-frequency module 400 by S500, the transmitter
200 generate B1 (the i.e. described RF magnetic field).
S600, the signal that the atomic nucleus being excited in patient body under B1 field action issues are decoupled through the birdcage coils
It after device 100 decouples, is perceived, is transferred to by transmission/reception switch described by the receiving coil in the radio-frequency module 400
Radio-frequency power amplifier 920 amplifies.
S700, the magnetic resonance signal of the amplification is by one in the analog-digital converter 930 demodulation, filtering and AD conversion
Kind or a variety of digitized processings, are then communicated to the storage mould group of the computer module.When the storage mould group obtains one group
After original k- spatial data, the end of scan.
In the present embodiment, there is the magnetic resonance system of birdcage coils decoupling device 100 by being arranged, realize multi-coil
The decoupling of 210 birdcage coils of port, so that entire magnetic resonance system normal operation.Further, since the feedback of birdcage coils 200
Electric port number increases, and the quantity of the power amplifier in power supply 300 is also increase accordingly, and puts to reduce every power
The peak power output of big device alleviates load pressure for power amplifier.
In addition, the birdcage coils decoupled system 10 not only limits the use of in magnetic resonance system, it can also be used to and magnetic resonance
In relevant Medical Devices or medical system, such as electron emission computerized tomograph instrument PET and Magnetic resonance imaging art MR two
It is combined with integration the large-scale functional metabolism being combined into and molecular image diagnostic device (PET/MR system) or magnetic resonance radiotherapy system by force
It unites (MR/RT system).
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The limitation of the application the scope of the patents above described embodiment only expresses.It should be pointed out that for this field
For those of ordinary skill, without departing from the concept of this application, various modifications and improvements can be made, these all belong to
In the protection scope of the application.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of birdcage coils decoupling device (100), is used cooperatively with birdcage coils (200), the birdcage coils solution
Coupling device (100) is electrically connected with the birdcage coils (200) and power supply (300) respectively, which is characterized in that the birdcage
Formula coil decoupling device (100) includes:
Combiner unit (110), the combiner unit (110) include multiple combiners (111), and the multiple combiner (111) is first
The tail combiner unit (110) in series；
The input terminal (112) of the combiner unit (110) is electrically connected with the power supply (300), for receiving the power supply
The power signal that power supply (300) generates；
The output end (113) of the combiner unit (110) is electrically connected with the birdcage coils (200), is used for the power
Signal is transmitted and is distributed to multiple coil ports (210) of the birdcage coils (200), to realize to the birdcage coils
(200) decoupling.
2. birdcage coils decoupling device according to claim 1, which is characterized in that each described combiner (111)
Including at least one combiner input port (111a) and at least one combiner output port (111b)；At least one described conjunction
A part of port in road device input port (111a) and at least one described combiner output port (111b) is not for realizing
With the connection between the combiner (111), another part port is for the input terminal as the combiner unit (110)
(112) and the output end (113) of the combiner unit (110).
3. birdcage coils decoupling device (100) according to claim 2, which is characterized in that
Each described combiner (111) includes two combiner input ports (111a) and two combiner outputs
Port (111b).
4. birdcage coils decoupling device (100) according to claim 3, which is characterized in that the power supply (300)
To be multiple, the sum of quantity of combiner input port (111a) of the multiple combiner (111) is equal to the power supply
(300) two times of quantity, the sum of quantity of combiner output port (111b) of the multiple combiner (111) are equal to described
Two times of the quantity of coil port (210).
5. birdcage coils decoupling device (100) according to claim 4, which is characterized in that the power supply (300)
Quantity be four, the quantity of the coil port (210) is four, and the combiner unit (110) includes four combinings
Device (111), each described combiner (111) include two combiner input ports (111a) and two combiners
Output port (111b).
6. birdcage coils decoupling device (100) according to claim 5, which is characterized in that the combiner unit (110)
Include:
First combiner (114), including first input port (114a), the second input port (114b), the first output port
(114c) and second output terminal mouth (114d)；
Second combiner (115), including third input port (115a), the 4th input port (115b), third output port
(115c) and the 4th output port (115d)；
Third combiner (116), including the 5th input port (116a), the 6th input port (116b), the 5th output port
(116c) and the 6th output port (116d)；And
4th combiner (117), including the 7th input port (117a), the 8th input port (117b), the 7th output port
(117c) and the 8th output port (117d)；
The first input port (114a), second input port (114b), the 5th input port (116a) and institute
It states the 6th input port (116b) to be electrically connected with a power supply (300) respectively, as the combiner unit (110)
Input terminal (112)；
The third output port (115c), the 4th output port (115d), the 7th output port (117c) and institute
It states the 8th output port (117d) to be electrically connected with a coil port (210) respectively, as the combiner unit (110)
Output end (113)；
First output port (114c) is electrically connected with the third input port (115a), the 4th input port
(115b) is electrically connected with the 5th output port (116c), the 6th output port (116d) and the 8th input port
(117b) electrical connection, the 7th input port (117a) are electrically connected with the second output terminal mouth (114d).
7. birdcage coils decoupling device (100) according to claim 1 to 6, which is characterized in that the conjunction
Road device (111) is same frequency combiner.
8. a kind of birdcage coils decoupled system (10) characterized by comprising
Power supply (300), for generating power signal；
Birdcage coils decoupling device (100) as described in any one of claims 1 to 7, the birdcage coils decoupling dress
The input terminal for setting (100) is electrically connected with the power supply (300), for receiving the power of the power supply (300) generation
Signal；
Birdcage coils (200) have multiple coil ports (210), and the birdcage coils (200) pass through the multiple coil
Port (210) is electrically connected with the output end of the birdcage coils decoupling device (100)；
The birdcage coils decoupling device (100) is also used to the power signal transmissions and distributes to the birdcage coils
(200) multiple coil ports (210), to realize the decoupling to the birdcage coils (200).
9. a kind of magnetic resonance system (20) based on birdcage coils structure characterized by comprising
Radio-frequency module (400), including birdcage coils (200)；The birdcage coils (200) are for generating RF magnetic field；
Gradient modules (500), including gradient coil (510)；The gradient coil (510) is set in the birdcage coils
(200) outside, the gradient coil (510) is for generating gradient magnetic；
Magnetic body module (600), is set in the outside of the gradient coil (510), for generating main field；
Birdcage coils decoupling device (100) as described in any one of claims 1 to 7, with the birdcage coils (200)
Electrical connection, for executing decoupling operation to the birdcage coils (200)；
Power supply (300) is electrically connected with the birdcage coils decoupling device (100), for generating power signal and by institute
It states power signal and is sent to the birdcage coils decoupling device (100)；
Controller (700) is electrically connected with the birdcage coils decoupling device (100) and/or the gradient modules (500), is used
In controlling, the radio-frequency module (400) generates the RF magnetic field and/or the gradient modules (500) generate the gradient magnetic
?；And
Host computer (800) is communicated to connect with the controller (700), for referring to the controller (700) transmitting scanning sequence
It enables, to control magnetic resonance system operation and generate magnetic resonance image.
10. the magnetic resonance system (20) according to claim 9 based on birdcage coils structure, which is characterized in that also wrap
It includes: auxiliary circuit (900)；
The auxiliary circuit (900) includes:
Radio circuit (910) is electrically connected with the birdcage coils decoupling device (100)；
Radio-frequency power amplifier (920), one end are electrically connected with the radio circuit (910), the other end and the controller (700)
Electrical connection；And
Analog-digital converter (930), one end are electrically connected with the birdcage coils decoupling device (100), the other end and the control
Device (700) electrical connection.
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| CN201910323537.4A CN110109035B (en) | 2019-04-22 | 2019-04-22 | Birdcage coil decoupling device, birdcage coil decoupling system and magnetic resonance system |
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