CN107317562B - Trap for magnetic resonance imaging - Google Patents
Trap for magnetic resonance imaging Download PDFInfo
- Publication number
- CN107317562B CN107317562B CN201610264546.7A CN201610264546A CN107317562B CN 107317562 B CN107317562 B CN 107317562B CN 201610264546 A CN201610264546 A CN 201610264546A CN 107317562 B CN107317562 B CN 107317562B
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- Prior art keywords
- shell
- electrode plate
- adjustable
- trap
- bracket
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- 238000002595 magnetic resonance imaging Methods 0.000 title claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims description 30
- 239000002184 metal Substances 0.000 claims description 30
- 238000001465 metallisation Methods 0.000 claims description 23
- 239000003990 capacitor Substances 0.000 claims description 11
- 239000000758 substrate Substances 0.000 claims description 7
- 239000000696 magnetic material Substances 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 2
- 239000010931 gold Substances 0.000 claims 2
- 229910052737 gold Inorganic materials 0.000 claims 2
- 230000001939 inductive effect Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000005764 inhibitory process Effects 0.000 abstract description 4
- 230000005311 nuclear magnetism Effects 0.000 abstract description 4
- 125000006850 spacer group Chemical group 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000013011 mating Effects 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H5/00—One-port networks comprising only passive electrical elements as network components
- H03H5/006—One-port networks comprising only passive electrical elements as network components comprising simultaneously tunable inductance and capacitance
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The invention provides a trap for magnetic resonance imaging, comprising: a housing having an inner cavity, a cable, and an adjustable capacitive element disposed on the housing and outside the inner cavity, the cable being wound into an adjustable inductive element and disposed in the inner cavity, and the capacitive element being connected in parallel with the inductive element; the adjustable inductance element and the capacitance element are used simultaneously, so that the trap achieves good inhibition effect at the working frequency point of nuclear magnetism work.
Description
[ field of technology ]
The invention relates to the technical field of magnetic resonance imaging, in particular to a wave trap for magnetic resonance imaging.
[ background Art ]
In magnetic resonance imaging devices, in order to obtain as good a signal-to-noise ratio as possible, the local coil is typically positioned as close as possible to the body of the subject or patient. For further transmission of the magnetic resonance signals from the local coil to the signal processing system, shielded coaxial cables are generally employed. The local coil is connected to a first coaxial cable that is plugged into the couch. Another coaxial cable is connected to the plug of the couch, which leads the magnetic resonance signals out of the couch and on to the signal processing system.
A high-frequency current is induced in a wire cover (metal shield layer) of the coaxial cable due to an electric field and a magnetic field formed at the stage of transmission or reception of the high-frequency pulse. Image interference can result without appropriate suppression measures and, in the worst case, can pose a hazard to the patient.
In order to suppress the generation of high-frequency currents, a trap integrated in the patient couch is used. The main functions of the wave trap are to suppress common mode signals on the radio frequency cable and to suppress the burning of the patient caused by the large currents. The trap generates a suppression signal at the operating frequency point of nuclear magnetic resonance according to the principle that capacitance and inductance generate resonance. To meet the working frequency point of nuclear magnetic operation, corresponding inductance and capacitance values need to be calculated; the calculated capacitance or inductance values are difficult to match exactly in practice. This requires that the capacitance or inductance be adjustable.
[ invention ]
The invention aims to provide a trap for magnetic resonance imaging, which is convenient to adjust.
The invention adopts the technical proposal for solving the technical problems that: a trap for magnetic resonance imaging, comprising: the adjustable capacitive element is arranged on the shell and located outside the inner cavity, the cable is wound into an adjustable inductance element and is arranged in the inner cavity, and the capacitance element is connected with the inductance element in parallel.
Preferably, the adjustable capacitance element comprises a first electrode plate and a second electrode plate which are arranged on the shell and are arranged at intervals relatively, and the second electrode plate can rotate or translate relatively to the first electrode plate.
Preferably, the first electrode plate and the second electrode plate are metal plates or insulating substrates coated with a metallization layer, and the second electrode plate is smaller than the first electrode plate.
Preferably, the shape of the metal plate or the metallized layer is crescent, rectangle, triangle or trapezoid.
Preferably, the adjustable inductance element further comprises a bracket for supporting the adjustable inductance element.
Preferably, the support is provided with a spiral groove for accommodating the adjustable inductor, and the length of the support is adjustable.
Preferably, the bracket is provided with a screw hole extending along the axial direction, and a metal screw is assembled in the screw hole.
Preferably, the screw is made of a conductive nonmagnetic material.
The invention adopts the technical proposal for solving the technical problems that: a trap for magnetic resonance imaging, comprising: the shell is provided with an inner cavity, the capacitance element is arranged on the shell and located outside the inner cavity, the cable is wound on the support to form an adjustable inductance element and is arranged in the inner cavity, the support is provided with a screw hole extending along the axial direction, a metal screw is assembled in the screw hole and used for adjusting the inductance value of the adjustable inductance element, and the capacitance element is connected with the adjustable inductance element in parallel.
Preferably, the shell is provided with a through hole, the through hole is communicated with the inner cavity, and the through hole is aligned with the metal screw.
The trap of the invention can achieve good inhibition effect at the working frequency point of nuclear magnetism work by using the adjustable inductance element or the adjustable capacitance element. The adjustable inductance element and the capacitance element have simple structures, convenient adjustment operation and larger adjustable range.
[ description of the drawings ]
FIG. 1a is a diagram of a parallel resonant circuit of a trap in accordance with an embodiment of the present invention;
FIG. 1b is a diagram of a parallel resonant circuit of another trap in accordance with an embodiment of the present invention;
FIG. 1c is a diagram of a parallel resonant circuit of a trap in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a combined structure of a trap according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another combination structure of a trap of an embodiment of the present invention;
FIG. 4 is an exploded view of the trap of FIG. 2;
FIG. 5 is another exploded view of the trap of FIG. 2;
fig. 6 is a further exploded view of the trap of fig. 2;
FIG. 7 is an exploded view of another tunable inductive element in an embodiment of the invention;
fig. 8 is an enlarged view of the bracket of the inductance element in fig. 7.
[ detailed description ] of the invention
The following detailed description of the present invention is provided in connection with the accompanying drawings and examples, which are not intended to limit the scope of the invention.
In order to suppress common-mode signals and to suppress high currents generated on radio-frequency cables, a trap integrated in the patient bed is used, which exhibits a high-ohmic impedance Z to high-frequency currents 0 High ohmic impedance Z 0 For example by means of a parallel resonant circuit. One or more coaxial cables are wound into a solenoid coil and a wire cover (metallic shield) is connected at one end of the coil thus produced to a capacitor connected in parallel to the coil. Such a trap is in all turnsAll of the wires leading through the transmit antenna are necessary. Fig. 1 shows a schematic circuit diagram of such a trap, in which a coaxial cable with a wire cover surrounding a plurality of inner conductors is wound into a solenoid coil, which is connected at both ends to the connections of a capacitor, by means of which the resonance of the parallel circuit thus formed can be adjusted. The inner conductor is insulated from the wire housing in the usual manner.
A trap for magnetic resonance imaging according to an embodiment of the present invention includes: the adjustable capacitor comprises a shell 1, a cable 3 and an adjustable capacitor element 4 and/or an adjustable inductor element 6, wherein the shell 1 is provided with an inner cavity, the adjustable capacitor element 4 is arranged on the shell 1 and is positioned outside the inner cavity, the capacitance value of the adjustable capacitor element 4 is adjustable, the cable 3 is wound on a bracket 5 to form a spiral coil structure, then the adjustable inductor element 6 is formed and is arranged in the inner cavity, and the adjustable capacitor element 4 is connected with the adjustable inductor element 6 in parallel. Optionally, one or more capacitive elements 7 may be additionally added in parallel with the adjustable inductive element 6 and/or the adjustable capacitive element 4.
The housing 1 includes a first housing 11, a second housing 12, and the first housing 11, the second housing 12 correspond to an upper half housing, a lower half housing, respectively, in the embodiment of the present invention. The second housing 12 has a second housing cavity 120 extending in the longitudinal direction in the middle, one side (right side) of the housing cavity 120 is provided with a second positioning member 121, the other side (left side) of the housing cavity 120 is provided with a second mating portion 122, and correspondingly, the first housing 11 has a first housing cavity 110 extending in the longitudinal direction in the middle, and the first housing cavity 110 and the second housing cavity 120 have substantially the same shape and structure, and may be enclosed into a substantially cylindrical structure for housing the bracket 5 or the inductance element 6. A first engaging portion 112 is provided on one side (right side) of the first accommodating chamber 110, and has substantially the same shape and structure as the second engaging portion 122, and a first positioning portion 111 is provided on the other side (left side) of the accommodating chamber 120, and the first positioning portion 111 has substantially the same shape and structure as the second positioning portion 121. When the first housing 11 and the second housing 12 are combined together, the first positioning portion 111 is combined with the second mating portion 122, the second positioning portion 121 is combined with the first mating portion 112, and the cable 3 penetrates through the accommodating cavities of the first housing 11 and the second housing 12, is fixed by the first positioning portion 111 and the second mating portion 122, and is fixed by the second positioning portion 121 and the first mating portion 112. The first housing 11 and the second housing 12 can be bonded together through glue, and in addition, the two housings can be assembled together in a mode of pressing and pre-tightening force of the two parts, and the two housings can be locked through screws.
The housing 1 is further provided with an electrical conductor (see fig. 3) on its surface outside the inner cavity, in particular, the electrical conductor may be a first metallization 114 or a metal layer provided on the first housing 11 and a second metallization 124 or a metal layer provided on the second housing 12, and the first metallization 114 and the second metallization 124 allow the current to pass. Further, in the intermediate region of the first case 11 and the second case 12, a first spacer 113 or a spacer region, and a second spacer 123 or a spacer region extending in the case circumferential direction are provided, and no metallization layer is provided in the first spacer 113 and the second spacer 123, so that the first metallization 114 and the second metallization 124 are interrupted by the gap, and at least one capacitor element 7 is arranged in the first spacer 113 and the second spacer 123 so as to bridge the first metallization 114 and the second metallization 124 on both sides of the first spacer 113 and the second spacer 123.
Further, the cable 3 includes a plurality of core wires, a metal braid coated on the outer surface of the core wires, and an insulating sheath positioned on the outer surface of the metal braid. The tunable inductive element 6 is electrically connected to the first metallization layer 114 and the second metallization layer 124 through a metal braid layer (not shown) of the cable 3, so that the tunable inductive element 6 forms a parallel resonant circuit together with the capacitive element 7, and by adjusting and tuning the parallel resonant circuit to a desired resonant frequency, the corresponding inductance and capacitance values need to be calculated, and the calculated capacitance or inductance value is difficult to be completely matched in practice, which requires that the magnitude of the inductance can be varied.
In one embodiment of the present invention, the inductance value of the adjustable inductance element 6 is adjustable, so that the resonant frequency of the parallel resonator circuit can reach about 5 MHZ.
Referring to fig. 4-6, the adjustable inductance element 6 can be obtained by: the outer circumference of the bracket 5 is provided with a spiral groove 51 for forming an inductor after the cable 3 is wound/positioned in the spiral groove 51, the center of the bracket 5 is provided with a screw hole 52 extending along the axial direction, in addition, a metal rod 2 is assembled in the screw hole 52, and the metal rod 2 is made of a conductive non-magnetic material, such as graphite, copper or aluminum. The surface of the metal rod 2 is further provided with threads which mate with screw holes 52.
Inductance is defined as the ability to store energy in a magnetic field, and the corresponding physical formula is:
the embodiment of the invention adopts a spiral inductor, which is a form of wound inductor, and the corresponding physical formula is as follows:
L＝4μ r (πRn)2/l
l in the formula is the inductance value of the inductor; mu (mu) r Is the magnetic permeability coefficient; r is the winding radius of the spiral inductor; n is the number of windings of the spiral inductor; l is the length of the spiral inductor.
The inductance value of the inductor can be adjusted according to the proportional relation between the inductance value and the magnetic conductivity in the formula; magnetic permeability mu under the condition of constant radius R, winding turns n and length l r Increasing the corresponding inductance value also increases and vice versa. Specifically, the magnetic permeability μ of the adjustable inductance element 6 can be adjusted by controlling the length of the metal rod 2 inside the adjustable inductance element 6 r Is of a size of (a) and (b). When the length of the metal rod 2 contained inside the adjustable inductance element 6 increases, the corresponding permeability μ r And also increases.
Further, a through hole 115 is provided in the outer case, the through hole 115 communicates with the inner cavity, and the through hole 115 is aligned with the metal rod 2 in the left-right direction, so that a tool can be inserted into the through hole 115 or the inner cavity to adjust the length of the metal rod 2 inside the adjustable inductance element 6.
In other embodiments, the adjustable inductance element 6 may be wound on a mold in a spiral shape, and then the mold is separated from the inductance after the inductance is integrally fixed or cured. In this case, the through hole 115 may be provided with a nut or a screw thread may be directly provided on the through hole 115, and the metal rod 2 may be assembled on the through hole 115, and the length of the metal rod 2 inside the adjustable inductance element 6 may be adjusted by rotating the metal rod, thereby adjusting the size of the adjustable inductance element 6.
In a further embodiment, an adjustable inductance element is obtained by providing a holder 5' with a spiral groove 51' at its outer periphery, a through hole 52' extending in axial direction being provided in the center of the holder 5', said cable 3 being wound in the spiral groove 51' to form the adjustable inductance element. Each spiral groove 51' of the bracket 5' is provided with a cut 53', and the cut 53' communicates with the through hole 52 '. By providing the slit 53', the length of the bracket 5' extending and contracting in the axial direction can be controlled, so that the size of the adjustable inductance element wound in the spiral groove 51' can be adjusted accordingly, specifically, when the bracket 5' is compressed, the corresponding inductance becomes large, and when the bracket 5' extends and contracts, the corresponding inductance becomes small. Specifically, the amount of expansion and contraction of the bracket can be controlled by the screw 21 penetrating the through hole 52' and the nut 22 assembled on the screw. The nut 22 is located outside the bracket 5'. In yet another embodiment, the number of turns of the inductor on the bracket 5' may be increased or decreased as needed to adjust the size of the inductor.
In another embodiment of the present invention, an adjustable capacitance element is added on the basis of adjustable inductance to form a parallel resonant circuit composed of adjustable inductance and adjustable capacitance, and the specific circuit principle is shown in fig. 2; the adjustable capacitance element can adjust the resonant frequency of the parallel resonator circuit to about 1MHZ, and the adjustment precision of the adjustable capacitance element is larger. The inductance and the capacitance in the parallel resonant circuit are adjustable, the adjusting range is larger, the adjusting mode is more flexible, and the adjusting precision is better.
Capacitance is defined as the ability to store energy in an electric field. A voltage difference exists between the two electrodes or the plane of similar structure. The magnitude of the capacitance value depends on the area of the two electrodes or the plane of similar structure; the height or thickness between two electrodes or similar structural planes; a dielectric filled between the two electrodes. The physical formula corresponding to the capacitance is:
c is the capacitance of the capacitor; epsilon 0 Is the dielectric coefficient; epsilon r Is the relative dielectric coefficient; a is the area; d is the thickness.
The invention is realized according to the proportional relation between the capacitance value and the area of two electrodes or similar structural planes in the formula. Under the condition that the dielectric coefficient and the thickness are unchanged, the capacitance value corresponding to the increase of the electrode area is also increased, and vice versa.
As shown in fig. 4 to 6, the tunable capacitive element 4 is constituted by a first electrode plate 41 and a second electrode plate 42 which are disposed at opposite intervals. The first electrode plate 41 has a rectangular shape and is fixedly coupled to the first housing 11. The first electrode plate 41 may include an insulating substrate 411 and a metallization layer 412 or a metal layer attached to insulate the insulating substrate. Both ends or side edges of the metallization 412 of the first electrode plate 41 are electrically connected to the metallization on the first housing 11. A circular hole 413 is provided in a central region of the insulating substrate 411.
The second electrode plate 42 is located below the opening 413, is movably connected to the first housing 11, and can see the second electrode plate 42 through the circular hole 413, and performs translational or rotational operation on the second electrode plate 42. The shape of the second electrode plate 42 is set to be circular, and the diameter of the second electrode plate 42 is larger than the inner diameter of the circular hole 413. The second electrode plate 42 may include an insulating substrate 421 and a metallization layer 422 or a metal layer attached to insulate the insulating substrate. The metallization layer 422 may be polygonal, such as crescent, rectangle, triangle, trapezoid, etc., or may be a graph that can realize the change of the capacitance area of the electrode plate when the first electrode plate and the second electrode plate move relatively. By rotating the second electrode plate 42, the facing area of the metallized layer 412 on the first electrode plate 41 and the metallized layer 422 on the second circuit plate 42 can be changed, thereby changing the capacitance value of the tunable capacitive element 4.
The surface of the first housing 11 is also provided with a counterbore 116 for receiving the second electrode plate 42. The counterbore 116 is circular with an inner diameter slightly greater than the diameter of the second electrode plate 42 and a depth slightly greater than the thickness of the second electrode plate 42. In order to facilitate adjustment of the second electrode plate 42, the second electrode plate 42 is further provided with an adjustment portion, which may be provided as an adjustment hole 423, for example, and the adjustment hole 423 may be contacted from the opening 413 of the first electrode plate 41, and the adjustment portion may be provided in other adjustment manners, such as a bump, a protrusion, or the like.
In summary, according to the trap of the present invention, the resonant circuit is formed by connecting the adjustable inductor and the fixed capacitor in parallel, so that the trap achieves a good inhibition effect at the working frequency point of nuclear magnetism. The trap of the invention can achieve good inhibition effect at the working frequency point of nuclear magnetism work by using the adjustable inductance element and the adjustable capacitance element simultaneously. The adjustable inductance element and the adjustable capacitance element have simple structures and convenient adjustment and operation.
While the invention has been described with reference to the preferred embodiments, it is not intended to limit the invention thereto, and it is to be understood that other modifications and improvements may be made by those skilled in the art without departing from the spirit and scope of the invention, which is therefore defined by the appended claims.
Claims (7)
1. A trap for magnetic resonance imaging, comprising: the adjustable inductance element comprises a shell, a cable, an adjustable capacitance element and a bracket for supporting the adjustable inductance element, wherein the shell is provided with an inner cavity, the adjustable capacitance element is arranged on the shell and is positioned outside the inner cavity, the cable is wound into the adjustable inductance element and is arranged in the inner cavity, and the adjustable capacitance element is connected with the adjustable inductance element in parallel; the adjustable capacitance element comprises a first electrode plate and a second electrode plate which are arranged at opposite intervals, the first electrode plate is fixedly connected with the shell, the second electrode plate is movably connected with the shell, an opening is formed in the first electrode plate, the second electrode plate is positioned below the opening, and the second electrode plate can be rotated or translated through the opening;
the shell comprises a first shell and a second shell, the first shell and the second shell are enclosed to form the inner cavity, the first shell is provided with a first gold metallization layer, and the second shell is provided with a second metallization layer or a metal layer;
the adjustable inductance device comprises a bracket, wherein a spiral groove for accommodating the adjustable inductance is formed in the bracket, a through hole extending along the axial direction is formed in the center of the bracket, a cable is wound in the spiral groove to form the adjustable inductance element, a notch is formed in each spiral groove of the bracket, and the notch is communicated with the through hole so that the length of the bracket is adjustable.
2. The trap of claim 1, wherein the first electrode plate and the second electrode plate are metal plates or insulating substrates coated with a metallization layer, the second electrode plate being smaller than the first electrode plate.
3. A trap as claimed in claim 2, wherein the metal plate or metallised layer is crescent, rectangular, triangular or trapezoidal in shape.
4. The trap of claim 1, wherein the bracket is provided with an axially extending screw hole, and wherein a metal screw is assembled in the screw hole.
5. The trap of claim 4, wherein the screw is made of a magnetically conductive non-magnetic material.
6. A trap for magnetic resonance imaging, comprising: the adjustable inductance element comprises a shell, a cable, a bracket and a capacitance element, wherein the shell is provided with an inner cavity, the capacitance element is arranged on the shell and is positioned outside the inner cavity, the cable is wound on the bracket to form the adjustable inductance element and is arranged in the inner cavity, the bracket is provided with a screw hole extending along the axial direction, a metal screw is assembled in the screw hole and used for adjusting the inductance value of the adjustable inductance element, and the adjustable capacitance element is connected with the adjustable inductance element in parallel; the adjustable capacitance element comprises a first electrode plate and a second electrode plate which are arranged at opposite intervals, the first electrode plate is fixedly connected with the shell, the second electrode plate is movably connected with the shell, an opening is formed in the first electrode plate, the second electrode plate is positioned below the opening, and the second electrode plate can be rotated or translated through the opening;
the shell comprises a first shell and a second shell, the first shell and the second shell are enclosed to form the inner cavity, the first shell is provided with a first gold metallization layer, and the second shell is provided with a second metallization layer or a metal layer;
the middle area of the first shell and the second shell is provided with a first interval groove and a second interval groove which extend along the circumferential direction of the shell, no metallization layer is arranged in the first interval groove and the second interval groove, and at least one capacitor element bridge connection is arranged between the first interval groove 113 and the second interval groove.
7. The trap of claim 6, wherein the housing is provided with a through hole, the through hole is in communication with the cavity, and the through hole is aligned with the metal screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610264546.7A CN107317562B (en) | 2016-04-26 | 2016-04-26 | Trap for magnetic resonance imaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610264546.7A CN107317562B (en) | 2016-04-26 | 2016-04-26 | Trap for magnetic resonance imaging |
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| Publication Number | Publication Date |
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| CN107317562A CN107317562A (en) | 2017-11-03 |
| CN107317562B true CN107317562B (en) | 2024-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610264546.7A Active CN107317562B (en) | 2016-04-26 | 2016-04-26 | Trap for magnetic resonance imaging |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737628A (en) * | 2020-12-30 | 2021-04-30 | 维沃移动通信有限公司 | Radio frequency circuit and electronic device |
| CN115938729B (en) * | 2023-01-02 | 2023-10-13 | 江苏晨朗电子集团有限公司 | Common-mode differential mode integrated flat coil filter inductor for resisting electromagnetic interference |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06215950A (en) * | 1993-01-13 | 1994-08-05 | Matsushita Electric Ind Co Ltd | Coil and manufacture thereof |
| CN1109226A (en) * | 1993-10-14 | 1995-09-27 | 周符明 | Electric power generator and method therefor |
| CN1433032A (en) * | 2002-01-08 | 2003-07-30 | 雄鹰通讯股份有限公司 | Adjustable inductor |
| CN102890253A (en) * | 2011-07-21 | 2013-01-23 | 西门子公司 | Standing wave trap integrated in local coil |
| CN103077829A (en) * | 2013-01-30 | 2013-05-01 | 慈溪市日益电容器厂 | Inner-series type self-healing capacitor serially connected with inductor and preparing method thereof |
| CN204177948U (en) * | 2014-10-16 | 2015-02-25 | 西门子(深圳)磁共振有限公司 | Decoupling inductor assembly, RF receiving coil and MR imaging apparatus |
| CN212659436U (en) * | 2020-07-05 | 2021-03-05 | 广州市德意电机有限公司 | Winding and trimming device for coil |
-
2016
- 2016-04-26 CN CN201610264546.7A patent/CN107317562B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06215950A (en) * | 1993-01-13 | 1994-08-05 | Matsushita Electric Ind Co Ltd | Coil and manufacture thereof |
| CN1109226A (en) * | 1993-10-14 | 1995-09-27 | 周符明 | Electric power generator and method therefor |
| CN1433032A (en) * | 2002-01-08 | 2003-07-30 | 雄鹰通讯股份有限公司 | Adjustable inductor |
| CN102890253A (en) * | 2011-07-21 | 2013-01-23 | 西门子公司 | Standing wave trap integrated in local coil |
| CN103077829A (en) * | 2013-01-30 | 2013-05-01 | 慈溪市日益电容器厂 | Inner-series type self-healing capacitor serially connected with inductor and preparing method thereof |
| CN204177948U (en) * | 2014-10-16 | 2015-02-25 | 西门子(深圳)磁共振有限公司 | Decoupling inductor assembly, RF receiving coil and MR imaging apparatus |
| CN212659436U (en) * | 2020-07-05 | 2021-03-05 | 广州市德意电机有限公司 | Winding and trimming device for coil |
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| Publication number | Publication date |
|---|---|
| CN107317562A (en) | 2017-11-03 |
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