CN109696642A - Coil device and magnetic resonance imaging system - Google Patents
Coil device and magnetic resonance imaging system Download PDFInfo
- Publication number
- CN109696642A CN109696642A CN201811645950.4A CN201811645950A CN109696642A CN 109696642 A CN109696642 A CN 109696642A CN 201811645950 A CN201811645950 A CN 201811645950A CN 109696642 A CN109696642 A CN 109696642A
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- China
- Prior art keywords
- coil
- radio
- magnet
- frequency
- frequency sending
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000002595 magnetic resonance imaging Methods 0.000 title claims abstract description 15
- 230000003321 amplification Effects 0.000 claims abstract description 12
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 12
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
-
- 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
- G01R33/34092—RF coils specially adapted for NMR spectrometers
-
- 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
- G01R33/42—Screening
- G01R33/422—Screening of the radio frequency field
Abstract
The present invention relates to a kind of coil device and magnetic resonance imaging systems, including magnet, radio-frequency sending coil, RF receiving coil, radio shielding layer, signal amplification and control system, wherein the magnet is rotated around center, the radio-frequency sending coil and the RF receiving coil are respectively positioned in the Plane of rotation of the magnet, and the radio-frequency sending coil is placed in the vertical direction of the magnet Plane of rotation, the radio-frequency sending coil is rounded, the RF receiving coil is multi-channel coil, the radio shielding layer is located on the two poles of the earth of the magnet, the signal amplification and control system are used to amplify the magnetic resonance signal of the RF receiving coil, the driving signal of the RF receiving coil is provided, signal path selection is carried out to the RF receiving coil in magnet rotation.The present invention can make the application range of radio-frequency coil more extensive.
Description
Technical field
The present invention relates to the technical field of medical instrument, a kind of coil device and magnetic resonance imaging system are referred in particular to
System.
Background technique
In modern medical technology, magnetic resonance imaging system has been a kind of common Medical Devices.Radio-frequency coil is made
For the indispensable a part of system, performance influences the performance of magnetic resonance imaging system very big.Coil device is existing
Designing mainly has orthogonal plate, the structures such as vertical bar lead-type, and in above structure, all coils are all to be fixed on magnetic resonance system
Magnet on, according to physical principle, radio-frequency coil need a good radio frequency environment, to guarantee the resonance frequency of its coil not
It can change, therefore belong to fixed radio-frequency coil.
With being constantly progressive for medical technology, fixed radio-frequency coil is no longer satisfied requirement, also needs to move sometimes
Radio-frequency coil, filled as Chinese invention patent (CN103744041A) discloses a kind of radio-frequency coil applied to magnetic resonance imaging
It sets, including power divider, upper magnet and lower magnet, further includes two radio-frequency coil units, the upper radio shielding of longitudinal arrangement
Layer and lower radio shielding layer, the radio-frequency coil unit are connected with the power divider；The upper radio shielding layer and institute
State the two sides up and down that lower radio shielding layer is located at the radio-frequency coil unit, the upper radio shielding layer and the lower radio frequency
Shielded layer it is parallel to each other, and be separately mounted on upper magnet and lower magnet；The radio-frequency coil unit, upper radio shielding layer
It is center symmetric shape with lower radio shielding layer.Although the above-mentioned transfer efficiency that can be improved radio-frequency coil unit, described
The moving range of radio-frequency coil is limited, equally the resonance frequency of radio-frequency coil can be made to have greatly changed after going beyond the scope, because
This still influences it and is widely used.
Summary of the invention
For this purpose, technical problem to be solved by the present invention lies in overcome in the prior art resonance frequency easily deviate and lead to radio frequency
The narrow problem of coil application range makes application range is widened to penetrate so that providing one kind can shift to avoid resonance frequency
Frequency coil device and magnetic resonance imaging system.
In order to solve the above technical problems, a kind of coil device of the invention, including magnet, radio-frequency sending coil, penetrate
Frequency receiving coil, radio shielding layer, signal amplification and control system, wherein the magnet is rotated around center, the radio frequency hair
Ray circle and the RF receiving coil are respectively positioned in the Plane of rotation of the magnet, and the radio-frequency sending coil is placed in
In the vertical direction of the magnet Plane of rotation, the radio-frequency sending coil is rounded, and the RF receiving coil is multichannel
Coil, the radio shielding layer are located on the two poles of the earth of the magnet, and the signal amplification and control system are for amplifying described penetrate
The magnetic resonance signal of frequency receiving coil provides the driving signal of the RF receiving coil, in magnet rotation to described
RF receiving coil carries out signal path selection.
In one embodiment of the invention, the quantity at least two of the radio-frequency sending coil, and be parallel to each other and set
It sets.
In one embodiment of the invention, the RF receiving coil is between two neighboring radio-frequency sending coil.
In one embodiment of the invention, the multi-channel coil at least has there are three with upper channel.
In one embodiment of the invention, the multi-channel coil is cyclic annular lap joint form.
In one embodiment of the invention, the RF receiving coil is seated on the center of the magnet.
In one embodiment of the invention, the circle number of the radio-frequency sending coil is line is a width of more than etc. more than or equal to 1
In 0.1cm.
In one embodiment of the invention, the circle number of the radio-frequency sending coil is 2, line width 2cm.
The present invention also provides a kind of magnetic resonance imaging systems, including coil device described in above-mentioned any one.
It in one embodiment of the invention, further include power divider, and the power divider and radio-frequency transmissions line
Circle is connected.
The above technical solution of the present invention has the following advantages over the prior art:
Coil device and magnetic resonance imaging system of the present invention, the radio-frequency sending coil is rounded, described in guarantee
The performance of radio-frequency sending coil, the RF receiving coil are multi-channel coils, and the radio shielding layer is located at the magnet
On the two poles of the earth, a fixed radio frequency environment can be provided to the radio-frequency sending coil by the radio shielding layer, while can
So that the radiofrequency field that the radio-frequency sending coil generates is more uniform, the signal amplification and control system are for amplifying described penetrate
The magnetic resonance signal of frequency receiving coil provides the driving signal of the RF receiving coil, in magnet rotation to described
RF receiving coil carries out signal path selection and is optimized in magnet rotary course by the channel of selective receiving coil
The signal of the RF receiving coil, therefore can shift to avoid resonance frequency, thus the radio frequency under solving rotational case
Coil application problem keeps the application range of radio-frequency coil more extensive.
Detailed description of the invention
In order to make the content of the present invention more clearly understood, it below according to specific embodiments of the present invention and combines
Attached drawing, the present invention is described in further detail, wherein
Fig. 1 is the schematic diagram of coil device of the present invention;
Fig. 2 is another schematic diagram of coil device of the present invention；
Fig. 3 is the schematic diagram of multi-channel coil of the present invention.
Figure of description description of symbols: 10- magnet, 11- radio-frequency sending coil, 12- RF receiving coil, 13- radio frequency screen
Cover layer, the amplification of 14- signal and control system.
Specific embodiment
Embodiment one
As depicted in figs. 1 and 2, it the present embodiment provides a kind of coil device, including magnet 10, radio-frequency sending coil 11, penetrates
Frequency receiving coil 12, radio shielding layer 13, signal amplification and control system 14, wherein the magnet 10 is rotated around center, institute
It states radio-frequency sending coil 11 and the RF receiving coil 12 is respectively positioned in the Plane of rotation of the magnet 10, and the radio frequency
Transmitting coil 11 is placed in the vertical direction of 10 Plane of rotation of magnet, and the radio-frequency sending coil 11 is rounded, described
RF receiving coil 12 is multi-channel coil, and the radio shielding layer 13 is located on the two poles of the earth of the magnet 10, and the signal is put
Big and control system 14 is used to amplify the magnetic resonance signal of the RF receiving coil 12, provides the RF receiving coil 12
Driving signal carries out signal path selection to the RF receiving coil 12 in the magnet 10 rotation.
Coil device described in the present embodiment, including magnet 10, radio-frequency sending coil 11, RF receiving coil 12, penetrate
Frequency shielded layer 13, signal amplification and control system 14, wherein the magnet 10 is rotated around center, the magnet 10 is for providing
Main field, the radio-frequency sending coil 11 and the RF receiving coil 12 are respectively positioned in the Plane of rotation of the magnet 10,
The radio-frequency sending coil 11 generates radiofrequency field required for magnetic resonance, and the radio-frequency sending coil 11 is placed in the magnet
In the vertical direction of 10 Plane of rotations, the RF receiving coil 13 receives magnetic resonance signal, and the radio-frequency sending coil 11 is in
Circle, can make the magnet 10 rotate to any angle its relative to radio frequency environment stationary state, guarantee the radio frequency hair
The performance of ray circle 11, the RF receiving coil 12 is multi-channel coil, and the radio shielding layer 13 is located at the magnet 10
The two poles of the earth on, by the radio shielding layer 13 can to the radio-frequency sending coil 11 provide a fixed radio frequency environment,
The radiofrequency field that the radio-frequency sending coil 11 can simultaneously generated is more uniform, and the signal amplification and control system 14 are used for
The magnetic resonance signal for amplifying the RF receiving coil 12 provides the driving signal of the RF receiving coil 12, in the magnetic
Signal path selection is carried out to the RF receiving coil 12 when body 10 rotates and passes through selectivity in 10 rotary course of magnet
The channel of receiving coil optimizes the signal of the RF receiving coil 13, to reach optimization RF receiving coil 13 property
The purpose of energy, can not only shift, and solve the radio-frequency coil application problem under rotational case to avoid resonance frequency,
Keep the application range of radio-frequency coil more extensive.
The quantity at least two of the radio-frequency sending coil 11, and it is arranged in parallel, to advantageously ensure that radio frequency
The uniformity of signal.The RF receiving coil 12 is between two neighboring radio-frequency sending coil 11, to advantageously ensure that
The uniform transmission of signal.The RF receiving coil 12 is seated on the center of the magnet 10, to advantageously ensure that signal
Effective reception.
The multi-channel coil at least has there are three with upper channel, thus be conducive in 10 rotary course of magnet,
It rotates suitable channel and carries out signal transmission.The multi-channel coil is cyclic annular lap joint form, be conducive to eliminate adjacency channel it
Between coupling.Multi-channel coil described in the present embodiment is eight channels, one piece is mutually snapped between each channel, thus favorably
The distribution map in the coupling between elimination adjacency channel, sectional drawing and each channel is as shown in Figure 3.In 10 rotary course of magnet
In, the radio-frequency sending coil 11 because being circular coil, the magnet 10 rotate to any angle its relative to radio frequency environment
For stationary state, and for the RF receiving coil 12, in 10 rotary course of magnet, there can be the letter in certain channels
It is number weaker and mixed and disorderly, influence signal-to-noise ratio, it is therefore desirable to turn off these channels.When the magnet 10 rotation, the signal
Amplification and control system 14 calculate the angle of the magnet 10, simultaneously turn off parallel with the magnet 10 lead to according to calculated result
Road.The modes of emplacement of magnet 10 as shown in Figure 1 turns off CH1 and CH5 then when magnet rotates -22.5 ° -22.5 °；When described
When magnet 10 rotates 22.5 ° -67.5 °, the road CH4 and CH8 is turned off；When the magnet 10 rotates 67.5 ° -112.5 °, CH3 is turned off
With the road CH7；When the magnet 10 rotates 112.5 ° -157.5 °, the road CH2 and CH6 is turned off.When opposite direction rotation, every 45 °
Channel switching is then carried out, achievees the purpose that optimization receives signal with this.
According to theoretical calculation and the feasibility of engineer application, the circle number of the radio-frequency sending coil 11 is the line more than or equal to 1
It is a width of more than to be equal to 0.1cm.The circle number of the radio-frequency sending coil is 2, when line width is 2cm, can obtain good radio frequency and close
At field homogeneity range, while transfer efficiency is very high.The shape of the magnet 10 is in four column types, is conducive to rotate.The radio frequency screen
It covers layer 13 and uses the preferable copper of conductivity, loss of the radio-frequency sending coil 11 in radio frequency environment can be made to reduce, therefore energy
Improve the efficiency of the radio-frequency sending coil 11.
Embodiment two
The present embodiment provides a kind of magnetic resonance imaging systems, including coil device described in embodiment one kind.Therefore implement
Advantage possessed by example one, the magnetic resonance imaging system also all have.
The magnetic resonance imaging system further includes power divider, the power divider and the radio-frequency sending coil 11
It is connected, the power divider is converted for radiofrequency signal and sends radiofrequency signal, magnetic resonance to the radio-frequency sending coil 11
When system imaging, the power divider be responsible for reconcile radio frequency transmissions, and be converted into analog radio frequency transmitting signal after
It is sent on the radio-frequency sending coil 11 by radio-frequency channel.
Obviously, the above embodiments are merely examples for clarifying the description, does not limit the embodiments.For
For those of ordinary skill in the art, other different form variations can also be made on the basis of the above description or are become
It is dynamic.There is no necessity and possibility to exhaust all the enbodiments.And obvious variation extended from this or change
It moves still within the protection scope of the invention.
Claims (10)
1. a kind of coil device, it is characterised in that: including magnet, radio-frequency sending coil, RF receiving coil, radio shielding
Layer, signal amplification and control system, wherein the magnet is rotated around center, the radio-frequency sending coil and the radio frequency are connect
Take-up circle is respectively positioned in the Plane of rotation of the magnet, and the radio-frequency sending coil is placed in hanging down for the magnet Plane of rotation
Histogram is upward, and the radio-frequency sending coil is rounded, and the RF receiving coil is multi-channel coil, radio shielding layer position
In on the two poles of the earth of the magnet, the signal amplification and control system are for amplifying the magnetic resonance letter of the RF receiving coil
Number, the driving signal of the RF receiving coil is provided, signal is carried out to the RF receiving coil in magnet rotation
Channel selecting.
2. coil device according to claim 1, it is characterised in that: the quantity of the radio-frequency sending coil is at least two
It is a and arranged in parallel.
3. coil device according to claim 2, it is characterised in that: the RF receiving coil is located at two neighboring penetrate
Between frequency transmitting coil.
4. coil device according to claim 1, it is characterised in that: the multi-channel coil at least has there are three more than
Channel.
5. coil device according to claim 4, it is characterised in that: the multi-channel coil is cyclic annular lap joint form.
6. coil device according to claim 1, it is characterised in that: the RF receiving coil is seated in the magnet
Center on.
7. coil device according to claim 1, it is characterised in that: the circle number of the radio-frequency sending coil be greater than etc.
In 1, line width is more than or equal to 0.1cm.
8. coil device according to claim 7, it is characterised in that: the circle number of the radio-frequency sending coil is 2, line width
For 2cm.
9. a kind of magnetic resonance imaging system, it is characterised in that: filled including radio-frequency coil described in any one of claim 1-8
It sets.
10. magnetic resonance imaging system according to claim 9, it is characterised in that: further include power divider, and the power
Distributor is connected with radio-frequency sending coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811645950.4A CN109696642A (en) | 2018-12-29 | 2018-12-29 | Coil device and magnetic resonance imaging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811645950.4A CN109696642A (en) | 2018-12-29 | 2018-12-29 | Coil device and magnetic resonance imaging system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109696642A true CN109696642A (en) | 2019-04-30 |
Family
ID=66233089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811645950.4A Pending CN109696642A (en) | 2018-12-29 | 2018-12-29 | Coil device and magnetic resonance imaging system |
Country Status (1)
| Country | Link |
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| CN (1) | CN109696642A (en) |
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