CN110441721A - Feed-through filter and magnetic resonance system applied to magnetic resonance system - Google Patents
Feed-through filter and magnetic resonance system applied to magnetic resonance system Download PDFInfo
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- CN110441721A CN110441721A CN201910843964.5A CN201910843964A CN110441721A CN 110441721 A CN110441721 A CN 110441721A CN 201910843964 A CN201910843964 A CN 201910843964A CN 110441721 A CN110441721 A CN 110441721A
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- filter
- feed
- magnetic resonance
- amplifier
- shimming
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- 239000003990 capacitor Substances 0.000 claims description 41
- 239000011324 bead Substances 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 15
- 230000005611 electricity Effects 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 4
- 230000004927 fusion Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000002595 magnetic resonance imaging Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Filters And Equalizers (AREA)
Abstract
This application involves a kind of feed-through filter and magnetic resonance system applied to magnetic resonance system, including shielding case, circuit board and filter element, the filter element is arranged on the circuit board, and is interconnected by circuit board trace；The shielding case covers on the outside of the filter element.The application is by the way that feed-through filter to be arranged on circuit boards, on the one hand the volume of feed-through filter is reduced, on the other hand, cable connection is not needed between shimming amplifier and feed-through filter, cost can be greatly lowered in terms of two above, but also the stability of feed-through filter and magnetic resonance system can be improved.
Description
Technical field
The present invention relates to medical fields, more particularly to a kind of feed-through filter applied to magnetic resonance system and magnetic resonance
System.
Background technique
Shimming amplifier is mounted on the equipment room of magnetic resonance imaging system, drive shim coil with compensate B0 second orders and with
The distortion of upper order.In order to separate amplifier to the interference scanning, feedthrough filter need to be installed on the wall between equipment room and scanning
Wave device.
Traditionally, internal to use π type or LC as shown in Figure 1, usually designing feed-through filter independently of shim power
Type and its cascaded topology, higher cost, overall volume are larger.Wherein, inductance is realized by covering magnet ring on screw rod, and capacitor is by crimping
Feedthrough capacitor or the capacitor of welding realize, be easy to be influenced by expanding with heat and contract with cold and poor contact occur, and be easy because of spiral shell
The rotation of bar and cause pad to be broken, thus all there is integrity problem.Secondly, between shimming power amplifier and feed-through filter
Longer cable is needed, the connection between cable needs reliable shielding, and cost equally be can not ignore.
Summary of the invention
The application provides a kind of feed-through filter and magnetic resonance system applied to magnetic resonance system, and equipment can be improved
Reliability and the volume and cost that feed-through filter can be reduced.
A kind of feed-through filter applied to magnetic resonance system, the feed-through filter include shielding case, circuit board and filter
Wave element, the filter element are arranged on the circuit board, and are interconnected by circuit board trace；The shielding case covers at institute
It states on the outside of filter element.
In one embodiment, the filter element includes: at least one of magnetic bead or inductance.
In one embodiment, the inductance includes hollow inductance or with core inductance.
In one embodiment, the filter element includes: capacitor.
In one embodiment, the capacitor includes at least one of noninductive patch capacitor or noninductive straight cutting capacitor.
In one embodiment, the filter element includes at least one of lc circuit, pi-network.
In one embodiment, the filter element includes at least two-stage series connection circuit.
A kind of magnetic resonance system, including shimming amplifier, shim coil and power supply further include above-mentioned feed-through filter；
The shimming amplifier is connect with the feed-through filter and power supply respectively, for becoming to the power supply
It changes, and by transformed charge transport to feed-through filter；
The feed-through filter is connect with shim coil, for being filtered to transformed electricity, and will be described
Filtered charge transport is powered to shim coil for the shim coil.
In one embodiment, the shimming amplifier and the feed-through filter are integrally disposed.
In one embodiment, the shimming amplifier and the feed-through filter are arranged on same circuit board, and described
Shimming amplifier is connected with the filter by circuit board trace.
Feed-through filter and magnetic resonance system provided by the embodiments of the present application applied to magnetic resonance system, including shielding
Shell, circuit board and filter element, the filter element are arranged on the circuit board, and are interconnected by circuit board trace；It is described
Shielding case covers on the outside of the filter element.By the way that feed-through filter setting on circuit boards, is on the one hand reduced feedthrough
On the other hand the volume of filter does not need cable connection, two above aspect is between shimming amplifier and feed-through filter
Cost can be greatly lowered, but also the stability of feed-through filter and magnetic resonance system can be improved.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of application for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram for traditional feed-through filter that an embodiment provides；
Fig. 2 is the structural schematic diagram for the feed-through filter applied to magnetic resonance system that an embodiment provides；
Fig. 3 is the topological schematic diagram for the feed-through filter that an embodiment provides；
Fig. 4 is the structural schematic diagram for the magnetic resonance system that an embodiment provides.
Specific embodiment
The application in order to facilitate understanding, in order to make the above objects, features, and advantages of the present application more apparent, under
Face is described in detail in conjunction with specific embodiment of the attached drawing to the application.It is explained in the following description many details
In order to fully understand the application, the better embodiment of the application is given in attached drawing.But the application can be with many not
With form realize, however it is not limited to embodiments described herein.On the contrary, the purpose of providing these embodiments is that making
Disclosure of this application is understood more thorough and comprehensive.The application can be to be much different from other way described herein
Implement, those skilled in the art can do similar improvement without prejudice to the application intension, therefore the application not by
The limitation of following public specific embodiment.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present application, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.In the description of the present application, " several " are meant that at least one, such as one,
Two etc., unless otherwise specifically defined.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.Term used herein is intended merely to the mesh of description specific embodiment
, it is not intended that in limitation the application.Term " and or " used herein includes one or more relevant listed items
Any and all combinations.
Fig. 2 is the structural schematic diagram for the feed-through filter applied to magnetic resonance system that an embodiment provides, such as Fig. 2 institute
Show, feed-through filter 120 includes shielding case, circuit board 100 and filter element 101, and the filter element 101 is arranged in the electricity
On road plate 100, and interconnected by circuit board trace；The shielding case covers at 101 outside of filter element, for protecting feedback
Bandpass filter.The shielding case can be cylindric metal shell, be also possible to other shapes, the present embodiment does not limit specifically
It is fixed.
Feed-through filter provided in this embodiment is based on board design, has broken the intrinsic knot of traditional feed-through filter
The cost of feed-through filter can be greatly lowered in structure.The cost of feed-through filter provided by the present application is about traditional feedthrough
The 1/16 of filter cost.
In addition, being difficult due to the structure that traditional feed-through filter is mechanical connection by multiple feed-through filter collection
At together.Even if multiple filters are mechanically integrated together, high cost will be expended and integrated volume is obvious
Increase.Feed-through filter is arranged on circuit boards the application, it is easier to which ground realization integrates multiple feedthroughs on same circuit board
Filter, and cost is relatively low；In addition it can which the volume after multiple feed-through filters integrate is greatly lowered.
In one embodiment, the filter element 101 includes at least one of lc circuit, pi-network.In this example
In, feed-through filter 120 uses lc circuit.
In one embodiment, as shown in Fig. 2, the filter element 101 includes: at least one of magnetic bead or inductance.
Magnetic bead is exclusively used in inhibiting signal wire, the high-frequency noise on power supply line and spike interference, also has and absorbs electrostatic pulse
Ability, ultra-high frequency signal can be absorbed.Magnetic bead has very high resistivity and magnetic conductivity, is equal to resistance and inductance is connected, but
Resistance value and inductance value all change with frequency.Magnetic bead model can be selected according to the impedance frequency curve of magnetic bead, pass through magnetic
The impedance frequency Curve selection of pearl has maximum impedance in noise reduced frequency range of wishing to decline, and in low frequency and direct current signal
Decay magnetic bead model as small as possible.
In one embodiment, patch magnetic bead, the lamination that patch magnetic bead is made of Ferrite Material and conductor coils are selected
Type monolithic structure.Selection patch magnetic bead is advantageous in that small package dimension, can satisfy the requirement of real space.
In one embodiment, inductance includes hollow inductance or with core inductance.Due to lc circuit in feed-through filter 120
The parasitic parameter model of inductance and capacitor is more than after self-resonant frequency, and capacitive will be mainly presented in inductance, and sense will be mainly presented in capacitor
Property, feed-through filter 120 will become high pass characteristic from low-pass characteristic at this time, to will affect the filtering effect of feed-through filter 120
Fruit.
In the embodiment of the application, in order to avoid the inductance with magnetic core is in capacitive in high frequency, using magnetic bead or hollow
The inductance of at least one of inductance alternative belt magnetic core.
At least one of magnetic bead or hollow inductance are arranged in feed-through filter 120 the present embodiment, can make feedthrough
The parasitic parameter of filter 120 is small as far as possible, and filter effect is more preferable.
In one embodiment, the filter element 101 includes capacitor, is filtered by capacitor to signal.
In one embodiment, the capacitor includes at least one of noninductive patch capacitor or noninductive straight cutting capacitor.
Signal is filtered using at least one of noninductive patch capacitor or noninductive straight cutting capacitor, such as can only be adopted
With noninductive patch capacitor or noninductive straight cutting capacitor, can also be connected using noninductive patch capacitor and noninductive straight cutting capacitor, so as to
To reduce parasitic inductance, to reduce the parasitic parameter of feed-through filter 120, make the filter effect of feed-through filter 120 more
It is good.
In one embodiment, the feed-through filter 120 includes inductance and capacitor, and the inductance and capacitor are integrally disposed.
Selected inductance and capacitor combination are integrated in feed-through filter 120, inductance and capacitor combination may include: patch magnetic bead
With the combination of noninductive patch capacitor, patch magnetic bead and noninductive straight cutting capacitor combination, hollow inductance and the combination of noninductive patch capacitor, hollow
Again with capacitor combination etc. after inductance and noninductive straight cutting capacitor combination, magnetic bead and the series connection of hollow inductance.Feed-through filter 120 is wrapped
It includes inductance and capacitor is integrally disposed, can be more convenient to use.
The material of capacitor includes at least one of ceramic material or film material, and material the present embodiment of capacitor does not limit
It is fixed.
In one embodiment, the filter element 101 includes at least two-stage series connection circuit.Such as it can be two-stage, three-level
Or the plural serial stages circuit such as level Four.The series of usual series circuit is more, and the Insertion Loss of feed-through filter 120 is stronger, filter effect
Better.The connection relationship of plural serial stage circuit can be with are as follows: the output end of previous stage circuit is connect with the input terminal of rear stage circuit.
In the present embodiment, as shown in figure 3, series circuit is multistage lc circuit series connection.And every level-one lc circuit include the first lc circuit and
Second lc circuit, and the first lc circuit and the series connection of the second lc circuit.First lc circuit and the concatenated public termination of the second lc circuit
Ground.It is understood that series circuit is also possible to the forms such as multistage pi-network, lc circuit and pi-network series connection.
Fig. 4 is the structural schematic diagram for the magnetic resonance system that an embodiment provides, as shown in figure 4, magnetic resonance system includes even
Field amplifier 110, shim coil 130 and power supply, further include above-mentioned feed-through filter 120.
The shimming amplifier 110 is connect with the feed-through filter 120 and power supply respectively, for the power supply into
Row transformation, and by transformed charge transport to feed-through filter；
The feed-through filter 120 is connect with shim coil 130, for being filtered to transformed electricity, and
By the filtered charge transport to shim coil, power for the shim coil 130.
Shimming amplifier 110 is typically mounted on the equipment room of magnetic resonance imaging system.One end of shimming amplifier 110 and electricity
The other end of source connection, shimming amplifier 110 is connect by feed-through filter 120 with shim coil 130.Shimming amplifier 110
It receives the voltage of power supply output and carries out conversion process, in the present embodiment, conversion process is usually decompression processing.And it will decompression
Voltage afterwards is transmitted to shim coil 130 by feed-through filter 120, with drive shim coil 130 compensate B0 second orders and with
The distortion of upper order.
In order to separate 110 betweens of shimming amplifier scanning interference, need between equipment room and scanning between installation feedthrough filter
Wave device 120 is filtered with the signal emitted shimming amplifier 110, and then is reduced between the interference scanning.Feed-through filter
120 be it is a kind of be mainly used for inhibiting high-frequency harmonic to the filtering devices of the interference such as signal, power supply line, usually by current-limiting reactor and
The low-pass filter circuit of shunt capacitor composition, it can allow the useful signal of low frequency to pass through, therefore feed-through filter 120 has
There is extraordinary High frequency filter effect.The most important technical indicator of feed-through filter 120 is usually used the rejection ability of interference
So-called insertion loss (Insertion Loss) indicates that its definition is: passing in no access filter from interference source
The defeated power P 1 to load and the ratio between the power P 2 for being transferred to load after access filter from interference source.
In one embodiment, as shown in figure 4, the shimming amplifier 110 includes power circuit and filter circuit；The function
Rate circuit is connect by the filter circuit with the feed-through filter 120, and the filter circuit is used for transformed voltage
The first filtering processing is carried out, and by the voltage transmission after the first filtering processing to the feed-through filter 120；
The feed-through filter 120 is used to carry out the second filtering processing to the voltage after the first filtering processing, and by second
Voltage transmission after filtering processing is powered to shim coil 130 for the shim coil 130.
Specifically, power circuit includes multiple switch pipe, and in the present embodiment, power circuit includes four switching tubes, respectively
It is first switch tube Q1, second switch Q2, third switching tube Q3 and the 4th switching tube Q4.Wherein, first switch tube Q1 and
Two switching tube Q2 are composed in series the first series arm, connect to power supply, third switching tube Q3 and the 4th switching tube Q4 composition second
Series arm, and it is in parallel with the first series arm.Filter circuit includes two lc circuits, is third lc circuit and the 4th LC respectively
Circuit, and third lc circuit and the series connection of the 4th lc circuit.Inductance and first switch tube Q1, second switch in third lc circuit
The connecting pin of Q2 connects；Inductance in 4th lc circuit is connect with the connecting pin of third switching tube Q3, the 4th switching tube Q4, third
The common end grounding of capacitor in lc circuit and the capacitor in the 4th lc circuit.
In one embodiment, the shimming amplifier and the feed-through filter are integrally disposed.
One end of first order circuit is connect with the common end of capacitor, inductance in third lc circuit, first order circuit it is another
One end is connect with the common end of capacitor, inductance in the 4th lc circuit, to realize feed-through filter 120 and shimming amplifier
110 it is integrally disposed.The output end of afterbody circuit is connect with shim coil 130, is used for the filtered electricity of multi-level pmultistage circuit
Pressure is transmitted to shim coil 130, powers for the shim coil 130.
In the application, shimming amplifier 110 and feed-through filter 120 are integrally disposed, such as can be by shimming amplifier 110
And the feed-through filter 120 is arranged on same circuit board, and the shimming amplifier and the filter pass through cabling
Connection.On the one hand it can reduce the volume of magnetic resonance system, on the other hand, shimming amplifier 110 and feed-through filter 120 are not required to
It wants cable to connect, saves the cost of the connection cables between shimming amplifier 110 and feed-through filter 120, and can also improve
The stability of magnetic resonance system.
It is understood that the shimming amplifier 110 and the feed-through filter 120 can be set in same structure
In, such as be arranged in same cabinet, as long as shimming amplifier 110 and the feed-through filter 120 can be made to be integrated in one
It rises, it is no longer necessary to which cable connects shimming amplifier 110 and feed-through filter 120.
In one embodiment, shimming amplifier 110 and feed-through filter 120 it is integrally disposed can also be low pass and feedthrough
Fusion.The electricity for usually requiring to export power supply in magnetic resonance system carries out the processing of low-pass filtering and feedthrough filtering, this implementation
Example can be realized simultaneously shimming amplifier 110 low by the way that the parameter of the filter circuit in shimming amplifier 110 to be adjusted
The function of pass filter and feedthrough filtering, to no longer need that feed-through filter 120 is separately provided to realize to realize filter function
The complete fusion of shimming amplifier 110 and feed-through filter 120.It is understood that can also be by the way that feedthrough filter be separately provided
Then wave device 120 is adjusted the parameter of feed-through filter 120, make feed-through filter 120 that low-pass filtering and feedback may be implemented
The function of pass filter, to can not include filter circuit in shimming amplifier 110, shimming amplifier is also may be implemented in such mode
110 and feed-through filter 120 complete fusion, i.e. the same circuit function of realizing low-pass filtering and feedthrough filtering, so as to
It further reduces the cost.
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 embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of feed-through filter applied to magnetic resonance system, which is characterized in that the feed-through filter includes shielding case, electricity
Road plate and filter element, the filter element are arranged on the circuit board, and are interconnected by circuit board trace, the shielding case
It covers on the outside of the filter element.
2. feed-through filter according to claim 1, which is characterized in that the filter element includes: in magnetic bead or inductance
At least one.
3. feed-through filter according to claim 2, which is characterized in that the inductance include hollow inductance or with magnetic core electricity
Sense.
4. feed-through filter according to claim 1, which is characterized in that the filter element includes: capacitor.
5. feed-through filter according to claim 4, which is characterized in that the capacitor includes noninductive patch capacitor or noninductive
At least one of straight cutting capacitor.
6. feed-through filter according to claim 1-5, which is characterized in that the filter element includes LC electricity
At least one of road, pi-network.
7. feed-through filter according to claim 6, which is characterized in that the filter element includes that at least two-stage series connection is electric
Road.
8. a kind of magnetic resonance system, including shimming amplifier, shim coil and power supply, which is characterized in that further include claim 1
To 7 described in any item feed-through filters；
The shimming amplifier is connect with the feed-through filter and power supply respectively, for being converted to the power supply, and
By transformed charge transport to feed-through filter；
The feed-through filter is connect with shim coil, for being filtered to transformed electricity, and by the filtering
Charge transport afterwards is powered to shim coil for the shim coil.
9. magnetic resonance system according to claim 8, which is characterized in that the shimming amplifier and the feed-through filter
It is integrally disposed.
10. magnetic resonance system according to claim 9, which is characterized in that the shimming amplifier and feedthrough filtering
Device is arranged on same circuit board, and the shimming amplifier is connected with the filter by circuit board trace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910843964.5A CN110441721A (en) | 2019-09-06 | 2019-09-06 | Feed-through filter and magnetic resonance system applied to magnetic resonance system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910843964.5A CN110441721A (en) | 2019-09-06 | 2019-09-06 | Feed-through filter and magnetic resonance system applied to magnetic resonance system |
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| Publication Number | Publication Date |
|---|---|
| CN110441721A true CN110441721A (en) | 2019-11-12 |
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| CN201910843964.5A Pending CN110441721A (en) | 2019-09-06 | 2019-09-06 | Feed-through filter and magnetic resonance system applied to magnetic resonance system |
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|---|---|---|---|---|
| US6218836B1 (en) * | 1997-12-22 | 2001-04-17 | U.S. Philips Corporation | MRI apparatus with a feedthrough unit provided in the wall of a Faraday cage |
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2019
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