CN202929186U - Coil assembly used for magnetic resonance imaging - Google Patents
Coil assembly used for magnetic resonance imaging Download PDFInfo
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- CN202929186U CN202929186U CN201220478128.5U CN201220478128U CN202929186U CN 202929186 U CN202929186 U CN 202929186U CN 201220478128 U CN201220478128 U CN 201220478128U CN 202929186 U CN202929186 U CN 202929186U
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- coil
- resonance imaging
- magnetic resonance
- circuit board
- coil block
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Abstract
The utility model discloses a coil assembly used for magnetic resonance imaging. The coil assembly comprises multiple crossed coil units, wherein each coil unit forms a thin long resonance circuit, the resonance circuits formed by any two crossed coil units are respectively arranged on two planes which are perpendicular to each other, each coil unit can be independently formed on a circuit board, and the multiple coil units are spliced to form the coil assembly. According to the coil assembly used for magnetic resonance imaging, all the coil units in the coil assembly are arranged on planes which are perpendicular to each other to make magnetic field vectors among each crossed coil unit orthogonal, and mutual coupling is small, and a back-connection de-coupling circuit is simplified; arrangement among the coil units is flexible; an inner portion enclosed by the resonance circuits has high magnetic induction intensity, and thereby signal reception sensitivity nearby the resonance circuits are improved.
Description
Technical field
The utility model relates to a kind of coil block, relates in particular to a kind of coil block for magnetic resonance imaging.
Background technology
In magnetic resonance imaging, need to use radio-frequency coil and transmit or receive signal from the imaging tissue, a plurality of coil units (being resonant tank) form a coil block.In general, the signal to noise ratio (S/N ratio) of imaging is relevant with the coil number on unit area.But can produce magnetic coupled phenomenon between a plurality of coil units, signal be produced disturb.
According to Ampère law, the electric current in conductor can produce magnetic field, and the direction of magnetic induction density B and direction of current satisfy the right-handed helix criterion, and the closed circuit integration along around conductor obtains the magnetic induction density formula as follows:
∮Bdl＝μ
0I
The size of magnetic induction density is inversely proportional to apart from r with a point and conductor.Due to the characteristic of revolving that has in magnetic field, for two nonopiate coils (current loop), as shown in Figure 4, the magnetic field that the first coil 1 produces can excite induction current on the second coil 2, and vice versa, is called magnetic coupling.The size of coupling is relevant with the relative position between two coils.Only have when two coil quadratures, the magnetic field that produces of the first coil 1 on center line with the second coil 2 place plane parallel, namely do not have magnetic flux pass through 2 of the second coils around area, just can not excite induction current on such the second coil 2, both just do not have coupling.
In mr imaging technique, coupling meeting between coil unit excites induction current in the coil unit loop, this induction current is not the signal from the imaging organization internal, therefore can not reflect the real image of imaging tissue, can cause signal to noise ratio (S/N ratio) to descend or produce pseudo-shadow, so must take the uncoupling measure in the coil block that the multi-coil unit forms.
Fig. 1 is existing planar coil modular construction schematic diagram, and the first coil 1, the second coil 2 be the part folded array successively.Between this coil unit, magnetic coupling is stronger, thereby need to add decoupling structure in rear connection circuit, such as prime amplifier uncoupling circuit, to satisfy system's uncoupling requirement, prime amplifier uncoupling circuit as shown in Figure 5, each coil unit is connected with the uncoupling circuit that is made of capacitor C 1, diode D1, inductance L 1 and amplifier AM, by the coupling between the inhibition coil unit of this circuit, avoids imaging is impacted.Because the parameter of the uncoupling circuit of each coil needs to debug respectively, debugging is comparatively complicated.
For existing three-dimensional coil block structure, as shown in Figure 2, also may there be the magnetic vector orthogonality relation between coil unit, this coil unit often needs to cover the outside surface of sample simultaneously, make arbitrary element often more than two, and coil around Area comparison large, thereby coupling between the unit is become be difficult to process.
Existing quadrature coil structure as shown in Figure 3, the first coil 1 and the second coil 2 direct orthogonalizations distribute, there is no magnetic coupling between them, if but the coil unit number increases, the coil unit that newly increases can't with the first coil 1 and the second coil 2 quadrature simultaneously, will inevitably cause nonopiate between coil-induced magnetic field, thereby produce larger magnetic coupling, thereby this structure is restricted for the coil unit number.
Therefore, need to provide a kind of improved coil block, to solve the magnetic coupling problem between coil.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of coil block for magnetic resonance imaging, not only can reduce the coupling between coil unit, the uncoupling circuit that connects after simplification is easy to debugging, arrange between coil unit and coil unit flexibly, the coil unit number can arrange flexibly; And can improve the magnetic induction density of coil inside, thereby improve signal receiving sensitivity.
The utility model is to solve the problems of the technologies described above the technical scheme that adopts to be to provide a kind of coil block for magnetic resonance imaging, comprise a plurality of crossing coil units, wherein, described each coil unit forms the resonant tank of an elongate, and the resonant tank that described any two crossing coil units form lays respectively on mutually perpendicular two planes.
Further, the resonant tank of described each coil unit formation is formed by a plurality of inductance and a plurality of capacitances in series.
Further, described coil unit also comprises circuit board, and described inductance and capacity arrangement are on described circuit board.
Further, described coil block comprises a plurality of circuit boards, and circuit board is pressed ranks perpendicular direction arrangement formation planar quadrature coil block.
Further, described coil block comprises a plurality of circuit boards, and circuit board radially forms curved surface quadrature coil assembly with the axial direction homeotropic alignment.
Further, the resonant tank that described coil unit forms is rectangle, and wherein bond length is less than 20mm.
Further, the number of turn of described each coil unit is 1.
Further, described circuit board is rigid printed circuit board or flexible PCB.
For solving the problems of the technologies described above, the utility model also provides a kind of coil block for magnetic resonance imaging, comprise a plurality of crossing coil units, wherein, described each coil unit comprises the elongate resonant tank that is connected to form by inductance, electric capacity, and described any two crossing coil units lay respectively on two orthogonal planes.
Further, each coil unit comprises the circuit board of carrying inductance, electric capacity, and mutually is spliced to form lattice-shaped between circuit board.
The utility model contrast prior art has following beneficial effect:
1) coil block that is used for magnetic resonance imaging that the utility model provides, in coil block, all intersecting lens coil units are positioned on mutually perpendicular plane, make to intersect magnetic vector quadrature between each coil unit, and mutual coupling is closed little, the uncoupling circuit that connects after can simplifying is easy to debugging; And can arrange flexibly the coil unit number;
2) coil block that is used for magnetic resonance imaging that provides of the present utility model, the magnetic induction density of its institute's region inside, coil unit loop is high, makes near the signal receiving sensitivity the coil unit loop high;
3) coil unit that is used for magnetic resonance imaging that the utility model provides can be made on circuit board easily, but the circuit board flexible combination forms coil block, is applicable to various planes, curved surface or stereo man body coil.
Description of drawings
Fig. 1 is existing planar coil modular construction schematic diagram;
Fig. 2 is existing three-dimensional coil block structural representation;
Fig. 3 is existing quadrature coil modular construction schematic diagram;
Fig. 4 is two nonopiate coil magnetic coupling schematic diagram;
Fig. 5 is the prime amplifier uncoupling circuit diagram that nonopiate coil unit adopts;
Fig. 6 is the planar quadrature coil block structural representation that the utility model is used for magnetic resonance imaging;
Fig. 7 is the curved surface quadrature coil modular construction schematic diagram that the utility model is used for magnetic resonance imaging;
Fig. 8 is the utility model single coil cellular construction schematic diagram;
Fig. 9 is the utility model resonant tank institute region internal magnetic field stack schematic diagram.
In figure:
1 first coil 2 second coil 3 electric capacity welds
4 first circuit board 5 second circuit boards
Embodiment
The utility model will be further described below in conjunction with drawings and Examples.
The coil block that is used for magnetic resonance imaging that the utility model provides comprises a plurality of coil units, each coil unit forms a resonant tank by a plurality of inductance and a plurality of capacitances in series, wherein, the resonant tank that in described coil block, all intersecting lens circles form is positioned on mutually perpendicular plane.
present coil production method, no matter be hardboard or soft board, basically be all integral manufacturing, after being the location positioning of coil, mutual alignment between each unit just can not change again, and after adopting coil block structure of the present utility model, because the coupling between each coil unit is little, mutual position is on not impact of coupling, and connect the uncoupling circuit after not needing, therefore can make separately each unit, then according to specific requirement and function with a plurality of circuit boards formation coil block that is stitched together, so not only save cost of manufacture, and can improve the dirigibility of design.
Theoretically, as long as the utility model has a coil unit loop just can be used for imaging, especially if an elongated regional imaging is just more suitable.In order to scan larger area-of-interest, perhaps need the characteristics according to sweep object, the distance between adjustment unit in order to reach the optimal imaging effect, needs a plurality of coil units are spliced to form coil block.The coil block that is used for magnetic resonance imaging that the utility model provides as long as guarantee on the plane or the curved surface quadrature, can adopt various shapes, as the structure of bending, to be fit to different application occasion and imaging function.
Fig. 6 is the planar quadrature coil block structural representation that the utility model is used for magnetic resonance imaging.
See also Fig. 6, described a plurality of circuit board can be arranged by the ranks perpendicular direction and form the planar quadrature coil block, first circuit board 4, second circuit board 5 ... totally six circuit boards form six resonant tank unit, all crossing coils are positioned on mutually perpendicular YZ plane and XZ plane, the magnetic vector of all the crossing unit relation that all is orthogonal, mutual coupling between each adjacent cells is closed littlely like this, can simplify rear connection circuit.Because area that coil unit encloses is little, when launching in system the induction electric current just little, to uncoupling require low, safer.The number of turn of each coil unit is preferably 1, formed by inductance and capacitances in series, each coil unit all consists of a resonant tank, therefore can be made in easily on ordinary circuit board, as rigid printed circuit board or flexible PCB, condenser welding is connected on the interval of two adjacent inductance, and the electric capacity weld 3 as shown in Figure 8.This coil block structure can be used for backbone or the more smooth position imaging of belly of human body, can directly overlay on human body, surrounding magnetic field intensity in each unit is stronger, and more even at the regional magnetic field that surrounds, and both combines to place flexibly to obtain good image.
Fig. 7 is the curved surface quadrature coil modular construction schematic diagram that the utility model is used for magnetic resonance imaging.
Please continue referring to Fig. 7, described a plurality of circuit board also can radially form the curved surface quadrature coil assembly of parcel imaging region with the axial direction homeotropic alignment, first circuit board 4, second circuit board 5 ... totally six circuit boards form six resonant tank unit, this coil block structure can be made on flexible material the four limbs imaging to human body, can bend and wrap imaging region, if it is larger that curvature becomes, also can give head, neck, wrist or ankle imaging, the magnetic field intensity of surrounding in area due to coil unit is high, can obtain imaging effect preferably.
because the utility model resonant tank is elongate, as shown in Figure 6, height on the z direction extremely low (namely less than 20mm), as shown in Figure 9, article two, the electric current formed magnetic field in the wire of long limit is identical at the magnetic direction of resonant tank institute's region inside, because the distance between two long limits is very near, therefore the magnetic field of described equidirectional in institute's region inside, loop superposes mutually, twice around the magnetic induction intensity of resonant tank institute's region inside is similar to the normal coil wire, can be considered as a bright line, can more " become clear " when irradiating object, therefore the part that plays the imaging effect in this coil is line, rather than face, form very strong induced field in the central area, loop, thereby improve the receiving sensitivity of coil.
In sum, the coil block that is used for magnetic resonance imaging that the utility model provides, in described coil block, all intersecting lens coil units are positioned on mutually perpendicular plane, intersect magnetic vector quadrature between each coil unit thereby make, mutual coupling is closed little, and the uncoupling circuit that connects after simplification is easy to debugging, and resonant tank inner magnet induction is high, and near the signal receiving sensitivity resonant tank is high.In addition, the coil block that is used for magnetic resonance imaging that the utility model provides can be made on circuit board easily, but the circuit board flexible combination is applicable to various planes, curved surface or stereo man body coil.
Although the utility model discloses as above with preferred embodiment; so it is not to limit the utility model; any those skilled in the art; within not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.
Claims (10)
1. coil block that is used for magnetic resonance imaging, comprise a plurality of crossing coil units, it is characterized in that, described each coil unit forms the resonant tank of an elongate, and the resonant tank that described any two crossing coil units form lays respectively on mutually perpendicular two planes.
2. the coil block for magnetic resonance imaging as claimed in claim 1, is characterized in that, the resonant tank that described each coil unit forms is formed by a plurality of inductance and a plurality of capacitances in series.
3. the coil block for magnetic resonance imaging as claimed in claim 2, is characterized in that, described coil unit also comprises circuit board, and described inductance and capacity arrangement are on described circuit board.
4. the coil block for magnetic resonance imaging as claimed in claim 3, is characterized in that, described coil block comprises a plurality of circuit boards, and circuit board is pressed ranks perpendicular direction arrangement formation planar quadrature coil block.
5. the coil block for magnetic resonance imaging as claimed in claim 3, is characterized in that, described coil block comprises a plurality of circuit boards, and circuit board radially forms curved surface quadrature coil assembly with the axial direction homeotropic alignment.
6. the coil block for magnetic resonance imaging as claimed in claim 2, is characterized in that, the resonant tank that described coil unit forms is rectangle, and the bond length of described rectangle is less than 20mm.
7. the coil block for magnetic resonance imaging as claimed in claim 2, is characterized in that, the number of turn of described each coil unit is 1.
8. the coil block for magnetic resonance imaging as described in claim 3～7 any one, is characterized in that, described circuit board is rigid printed circuit board or flexible PCB.
9. coil block that is used for magnetic resonance imaging, comprise a plurality of crossing coil units, it is characterized in that, described each coil unit comprises the elongate resonant tank that is connected to form by inductance, electric capacity, and described any two crossing coil units lay respectively on two orthogonal planes.
10. the coil block for magnetic resonance imaging as claimed in claim 9 is characterized in that: each coil unit comprises the circuit board of carrying inductance, electric capacity, and mutually is spliced to form lattice-shaped between circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220478128.5U CN202929186U (en) | 2012-09-18 | 2012-09-18 | Coil assembly used for magnetic resonance imaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220478128.5U CN202929186U (en) | 2012-09-18 | 2012-09-18 | Coil assembly used for magnetic resonance imaging |
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| Publication Number | Publication Date |
|---|---|
| CN202929186U true CN202929186U (en) | 2013-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201220478128.5U Expired - Lifetime CN202929186U (en) | 2012-09-18 | 2012-09-18 | Coil assembly used for magnetic resonance imaging |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568389A (en) * | 2018-06-06 | 2019-12-13 | 通用电气公司 | Method and system for radio frequency coil assembly |
-
2012
- 2012-09-18 CN CN201220478128.5U patent/CN202929186U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568389A (en) * | 2018-06-06 | 2019-12-13 | 通用电气公司 | Method and system for radio frequency coil assembly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201815 No. 1180 Xingxian Road, Jiading Industrial Zone, Jiading District, Shanghai Patentee after: Shanghai Lianying Medical Technology Co.,Ltd. Address before: 201815 No. 1180 Xingxian Road, Jiading Industrial Zone, Jiading District, Shanghai Patentee before: SHANGHAI UNITED IMAGING HEALTHCARE Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130508 |