CN106125024B - MRI system and its gradient amplifier driving circuit, test macro - Google Patents
MRI system and its gradient amplifier driving circuit, test macro Download PDFInfo
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- CN106125024B CN106125024B CN201610697223.7A CN201610697223A CN106125024B CN 106125024 B CN106125024 B CN 106125024B CN 201610697223 A CN201610697223 A CN 201610697223A CN 106125024 B CN106125024 B CN 106125024B
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- 238000012360 testing method Methods 0.000 title claims abstract description 17
- 230000003321 amplification Effects 0.000 claims abstract description 25
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 8
- 230000010355 oscillation Effects 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000005284 excitation Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 238000003032 molecular docking Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 8
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 208000032767 Device breakage Diseases 0.000 abstract 1
- 238000002595 magnetic resonance imaging Methods 0.000 description 9
- 239000000306 component Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
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- 238000003384 imaging method Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
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- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
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- 238000002059 diagnostic imaging Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/385—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
- G01R33/3852—Gradient amplifiers; means for controlling the application of a gradient magnetic field to the sample, e.g. a gradient signal synthesizer
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
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- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
This application discloses a kind of MRI system and its gradient amplifier driving circuits, test macro, and wherein gradient amplifier driving circuit includes: DC-DC conversion circuit；And the signal amplification driving circuit being connected with DC-DC conversion circuit, signal amplification driving circuit include: the output interface of the input interface and output processing gained secondary signal for input gradient echo impulse.In this way, when gradient amplifier breaks down, under normal circumstances, failure is that high power device bursts and puncturing corresponding driving circuit causes gradient amplifier to burn out, at this moment individually signal amplification driving circuit can be corresponded to and is picked out from cabinet by interface, breakdown maintenance test is done in additional power source, signal generator and load in tooling, has not only been facilitated but also quick, has been saved manpower and shortened maintenance time.
Description
Technical field
This application involves medical imaging field more particularly to MRI system and its gradient amplifier driving electricity
Road, test macro.
Background technique
Gradient amplifier is Magnetic resonance imaging (Magnetic Resonance Imaging, MRI) system core equipment
One of, it is mainly responsible for powering to gradient coil, so that gradient coil generates the gradient of a linear transformation in imaging space
Magnetic field makes not identical everywhere in imaging region, realization magnetic field space coding, in order to obtain the image of high quality, it is desirable that gradient is put
Big device can provide inductive load the current impulse that precision is high and converts.
MRI powerful devices such as gradient amplifier in operation and use process are one of failure rate highest equipment, due to
It is responsible for powering to gradient coil, and under high pressure-temperature high current HF switch state, various failures occurs in operation for long-term work
Risk it is relatively high, and in terms of phenomenon of the failure, 90% or more is caused by signal amplification driving circuit, is burnt power supply and is hit
It wears high power device and short-circuit, causes control module damage to directly contribute magnetic resonance system series of problems, even if there is gradient amplification
Device devises protection circuit, but gradient amplifier can not be avoided significant trouble occur completely in nanosecond.Gradient
Amplifier apparatus is expensive, its failure will cause the economic loss that can not be retrieved.
Currently, the signal amplification driving circuit of all gradient amplifiers be fully integrated into it is inseparable on a whole pcb board
It cuts and dismantles, external power supply, signal generator and load are also connected without signal and power interface and carries out simulation test, dimension
It has no way of doing it when repairing.It is all that charged and external signal is needed to make on-line testing in many cases.Due to the superior and the subordinate or front stage
Circuit is inseparable, at this moment often generates induction to other circuits and interferes, is unfavorable for breakdown judge and fault location, always
This integral structure be unfavorable for test and repair.
Summary of the invention
The application is intended to solve above-mentioned magnetic resonance gradient amplifier detection and maintenance technique problem to a certain extent.
According to a first aspect of the present application, the application provides a kind of gradient amplifier driving circuit, comprising:
For generating the DC-DC conversion circuit of working power；And
It is being connected with the DC-DC conversion circuit, for the working power power supply under to externally input ladder
Degree echo impulse amplifies processing and exports the signal amplification driving circuit of processing gained secondary signal,
The signal amplification driving circuit includes: the input interface and output institute for inputting the gtadient echo pulse
State the output interface of secondary signal.
Further, the DC-DC conversion circuit includes:
For generate first switch oscillation involve second switch oscillation wave recommend pulse width modulation chip, described first
Switch oscillating wave and the second switch oscillation wave reverse phase；
With it is described recommend it is that pulse width modulation chip is connected, for being amplified to the first switch oscillation wave the
One high-speed driving pipe；
With it is described recommend it is that pulse width modulation chip is connected, for being amplified to the second switch oscillation wave the
Two high-speed driving pipes；
High frequency transformer with first input end, the second input terminal and the first output end, the first high-speed driving pipe
It is docked simultaneously with the first input end, the second high-speed driving pipe is docked with second input terminal simultaneously；
The current rectifying and wave filtering circuit being connected with first output end；And
The voltage-regulating circuit that the current rectifying and wave filtering circuit is connected to simultaneously.
Further, the DC-DC conversion circuit further include:
Coupled capacitor is additionally provided between the first high-speed driving pipe and the first input end；And
Excitation inductance is additionally provided between the second high-speed driving pipe and second input terminal.
Further, the DC-DC conversion circuit further include:
Coupled capacitor is additionally provided between the second high-speed driving pipe and second input terminal；And
Excitation inductance is additionally provided between the first high-speed driving pipe and the first input end.
Further, the signal amplification driving circuit includes:
For being the photoelectrical coupler of ripple by the gtadient echo pulses switch；
Third high-speed driving pipe be connected with the photoelectrical coupler, for being amplified to the ripple；
4th high-speed driving pipe being connected with the photoelectrical coupler, for being amplified to the ripple；And
Synthesizer with third input terminal, the 4th input terminal and second output terminal, the third high-speed driving pipe is simultaneously
It is docked by a resistance with diodes in parallel branch with the third input terminal, the 4th high-speed driving pipe is simultaneously with described the
The docking of four input terminals.
Further, the diode is Schottky diode.
Further, single single row direct insert interface is collectively formed in the input interface and the output interface.
Further, the DC-DC conversion circuit and the signal amplification driving circuit are divided into different tracks
On road plate or same printed wiring board.
According to a second aspect of the present application, the application provides a kind of MRI system, comprising: such as above-mentioned gradient
Amplifier drive circuit.
According to the third aspect of the application, the application provides a kind of test macro, comprising: as above-mentioned gradient amplifier drives
Dynamic circuit, the signal generator for generating the gtadient echo pulse, and, for receiving the load of the secondary signal.
The beneficial effect of the application is:
By providing a kind of MRI system and its gradient amplifier driving circuit, test macro, wherein gradient
Amplifier drive circuit includes: DC-DC conversion circuit；And the signal amplification being connected with DC-DC conversion circuit is driven
Dynamic circuit, signal amplification driving circuit include: the input interface and output processing gained for input gradient echo impulse
The output interface of grade signal.In this way, under normal circumstances, failure is high power device explosion when gradient amplifier breaks down
And puncture corresponding driving circuit and cause to burn out, at this moment can individually it lead to from cabinet signal amplification driving circuit is corresponding
It crosses interface to pick out, maintainability test is made in additional power source, signal generator and load in tooling, realizes to failure degree amplifier circuit
Accurate judgment and detection greatly improves failure gradient amplifier maintenance efficiency.This method had not only facilitated but also quick, saving
Manpower shortens maintenance time.
Detailed description of the invention
Fig. 1 is the circuit structure diagram of DC-DC conversion circuit in the embodiment of the present application.
Fig. 2 is the circuit structure diagram of signal amplification driving circuit in the embodiment of the present application.
Fig. 3 is the PCB layout of the gradient amplifier driving circuit of the embodiment of the present application.
Specific embodiment
Embodiments herein is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the application, and should not be understood as the limitation to the application.
In the description of the present application, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of
It describes the application and simplifies description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with spy
Fixed orientation construction and operation, therefore should not be understood as the limitation to the application.
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 one or more of the features.In the description of the present application, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In this application unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this Shen as the case may be
Please in concrete meaning.
In this application unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower"
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above "
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of
First feature horizontal height is less than second feature.
The application is described in further detail below by specific embodiment combination attached drawing.
The present embodiment provides a kind of gradient amplifier driving circuits, comprising:
For generating the DC-DC conversion circuit of working power；And
It is being connected with DC-DC conversion circuit, for working power power supply under to externally input gtadient echo arteries and veins
It rushes in row enhanced processing and exports the signal amplification driving circuit of processing gained secondary signal.
Wherein, signal amplification driving circuit includes: secondary for the input interface of input gradient echo impulse and output
The output interface of signal.
With reference to Fig. 1, DC-DC conversion circuit includes:
The pulse width of recommending for involving second switch oscillation wave for generating first switch oscillation modulates chip 1, and first opens
Close oscillation wave and second switch oscillation wave reverse phase；
The first high speed that chip U1 is connected, for amplifying to first switch oscillation wave is modulated with pulse width is recommended
Driving tube U2；
The second high speed that chip 1 is connected, for amplifying to second switch oscillation wave is modulated with pulse width is recommended
Driving tube U3；
High frequency transformer T1, the first high-speed driving pipe U2 with first input end, the second input terminal and the first output end
It is docked simultaneously with first input end, the second high-speed driving pipe U3 is docked with the second input terminal simultaneously；
The current rectifying and wave filtering circuit D1 being connected with the first output end；And
The voltage-regulating circuit VR2 that current rectifying and wave filtering circuit D1 is connected to simultaneously.
In the present embodiment, DC-DC conversion circuit further include:
Coupled capacitor C1 is additionally provided between first high-speed driving pipe U2 and first input end；And
Excitation inductance L1 is additionally provided between second high-speed driving pipe U3 and the second input terminal.
In other embodiments, DC-DC conversion circuit further include:
Coupled capacitor C1 is additionally provided between second high-speed driving pipe U3 and the second input terminal；And
Excitation inductance L1 is additionally provided between first high-speed driving pipe U2 and first input end.
And signal amplification driving circuit includes:
For being the photoelectrical coupler PH2 of ripple by gtadient echo pulses switch；
Third high-speed driving pipe U10 be connected with photoelectric coupling PH2, for being amplified to ripple；
4th high-speed driving pipe U11 being connected with photoelectrical coupler PH2, for being amplified to ripple；And
Synthesizer OUT WF with third input terminal, the 4th input terminal and second output terminal, third high-speed driving pipe U10
It is docked with diode D3 parallel branch with third input terminal by a resistance R3 simultaneously, the 4th high-speed driving pipe U11 while with the
The docking of four input terminals.
Schottky diode can be used in diode D3.
Single single row direct insert interface J is collectively formed in input interface and output interface, as shown in Figure 3.
DC-DC conversion circuit and signal amplification driving circuit can be divided into different printed wiring boards or same track
On the plate of road.
The present embodiment also provides a kind of MRI system, comprising: such as above-mentioned gradient amplifier driving circuit, with
And gradient coil etc..
The present embodiment also provides a kind of test macro, comprising: such as above-mentioned gradient amplifier driving circuit, for generating ladder
The signal generator of echo impulse is spent, and, for receiving the load of secondary signal.
Illustrate the application of the present embodiment below by a specific example.
Gradient amplifier driving circuit may include DC-DC conversion (DC-DC CONVERTER) circuit and GATE signal
Amplify drive signal circuit, and corresponding connector etc..It is simple and clear not only to facilitate installation but also facilitate maintenance.
First part's DC-DC CONVERTER circuit:
Power supply is provided using+15V DC power supply, is converted to after three-terminal voltage-stabilizing and powers for+12V to entire circuit, circuit
Core component is to recommend pulse width modulation (Push-pull Pulse Width Modulation, PPPWM) integrated circuit.
PPPWM is one piece of BICMOS fabric chip, and comprising required drive control circuit, peripheral cell is few, can export high speed and push away
Draw pulse width modulated waveform.
Its working principle is shown in Fig. 1, and the RC oscillation in PPPWM generates sawtooth wave, and OUTA and OUTB export the wheel of reversion respectively
Flow alternate 1/2 switch oscillating frequency waveform, both waveform duty cycle < 50%.OUTA and OUTB waveform respectively through U2~U3,
U3~U4 high-speed driving pipe enhancing amplification, coupled capacitor, excitation inductance, high frequency transformer, final rectified filter circuit generation+
12V ,+12V adjust output+5V(VCC by VR2~VR3 voltage), the above circuit constitutes DC-DC CONVERTER circuit.
Second part GATE signal amplifies drive signal circuit:
It is various gradient sequence waveforms through photoelectric coupling integrated circuit, high-speed driving chip, Schottky diode, resistance
Equal pcb boards and connector composition.
Its working principle is shown in Fig. 2, and the spectrometer that various sequences are controlled through computer generates pulse signal, is turned by interlock circuit
It changes (3.5Vpp) TTL digital level into, then obtains the ripple waveform warp of almost nil electric current after PH1~PH2 photoelectrical coupler
U6~U7, U8~U9, U10~U11, the amplification of U12~U13 high-speed driving pipe, which are promoted to 25Vpp, is then sent through the pole G of metal-oxide-semiconductor to end
Grade amplifier provides waveform.
Related commissioning instrument, signal generator, oscillograph and relevant speciality test probe form test macro.
As shown in figure 3, circuit diagram is converted into component figure and generates PCB, it can be Fig. 1 and Fig. 2 two parts circuit knot
It is exactly our common PCB in kind that conjunction, which is integrated on one piece of PCB,.
Component uses surface encapsulation component on entire PCB, has saved reduced space PCB volume, J1 on integral layout
~J6 is that signal outputs and inputs interface, is realized between GATE DRIVER PCB and GRADIENT POWER PCB by them
It communicates, single single row direct insert mouthpiece is used in structure.
GATE DRIVER PCB is fixed on the rack by H1~H3 using plastic buckle, avoids metal screws and its
Its component contact brings interference signal, while also easy to disassemble so that it is convenient to test and repair, and Whole PC B uses several plastics
Buckle is fixedly mounted and avoids freely being adjusted using metal screws inductive grounding problem using plastic buckle on the rack
The distance between PCB and connector but also can be with shock-absorbing etc..
Most importantly facilitate maintenance, in this way, under normal circumstances, failure is big function when gradient amplifier breaks down
Rate device, which bursts and punctures corresponding driving circuit, to be caused to burn out, at this moment can be individually that signal amplification driving circuit is corresponding
It is picked out from cabinet by interface, maintainability test is made in additional power source, signal generator and load in tooling, has not only facilitated but also fast
Victory has saved manpower and has shortened maintenance time.
In the description of this specification, reference term " embodiment ", " some embodiments ", " an implementation
The description of example ", " some embodiments ", " example ", " specific example " or " some examples " etc. means to combine the embodiment or example
Particular features, structures, materials, or characteristics described are contained at least one embodiment or example of the application.In this explanation
In book, schematic expression of the above terms be may not refer to the same embodiment or example.Moreover, the specific spy of description
Sign, structure, material or feature can be combined in any suitable manner in any one or more of the embodiments or examples.
The foregoing is a further detailed description of the present application in conjunction with specific implementation manners, and it cannot be said that this Shen
Specific implementation please is only limited to these instructions.For those of ordinary skill in the art to which this application belongs, it is not taking off
Under the premise of from the application design, a number of simple deductions or replacements can also be made.
Claims (9)
1. a kind of gradient amplifier driving circuit characterized by comprising
For generating the DC-DC conversion circuit of working power；And
It is being connected with the DC-DC conversion circuit, for the working power power supply under to externally input gradient return
Wave impulse amplifies processing and exports the signal amplification driving circuit of processing gained secondary signal,
The signal amplification driving circuit includes: the input interface and output described time for inputting the gtadient echo pulse
The output interface of grade signal；
The DC-DC conversion circuit includes:
The pulse width of recommending for involving second switch oscillation wave for generating first switch oscillation modulates chip, the first switch
Oscillation wave and the second switch oscillation wave reverse phase；
Input terminal with it is described recommend pulse width modulation chip output pin be connected, be used for the first switch oscillation wave
The the first high-speed driving pipe amplified；
Input terminal with it is described recommend pulse width modulation chip output pin be connected, be used for the second switch oscillation wave
The the second high-speed driving pipe amplified；
High frequency transformer with first input end, the second input terminal and the first output end, the first high-speed driving pipe it is defeated
Outlet is docked with the first input end simultaneously, the output end of the second high-speed driving pipe simultaneously with second input terminal pair
It connects；
The current rectifying and wave filtering circuit being connected with first output end；And
The voltage-regulating circuit that the current rectifying and wave filtering circuit is connected to simultaneously.
2. gradient amplifier driving circuit as described in claim 1, which is characterized in that the DC-DC conversion circuit is also
Include:
Coupled capacitor is additionally provided between the first high-speed driving pipe and the first input end；And
Excitation inductance is additionally provided between the second high-speed driving pipe and second input terminal.
3. gradient amplifier driving circuit as described in claim 1, which is characterized in that the DC-DC conversion circuit is also
Include:
Coupled capacitor is additionally provided between the second high-speed driving pipe and second input terminal；And
Excitation inductance is additionally provided between the first high-speed driving pipe and the first input end.
4. gradient amplifier driving circuit as described in claim 1, which is characterized in that the signal amplification driving circuit packet
It includes:
For being the photoelectrical coupler of ripple by the gtadient echo pulses switch；
Third high-speed driving pipe be connected with the photoelectrical coupler, for being amplified to the ripple；
4th high-speed driving pipe being connected with the photoelectrical coupler, for being amplified to the ripple；And
Synthesizer with third input terminal, the 4th input terminal and second output terminal, the third high-speed driving pipe pass through simultaneously
One resistance is docked with diodes in parallel branch with the third input terminal, and the 4th high-speed driving pipe is defeated with the described 4th simultaneously
Enter end docking.
5. gradient amplifier driving circuit as claimed in claim 4, which is characterized in that the diode is two pole of Schottky
Pipe.
6. gradient amplifier driving circuit as described in claim 1, which is characterized in that the input interface and the output connect
Single single row direct insert interface is collectively formed in mouth.
7. gradient amplifier driving circuit as described in claim 1, which is characterized in that the DC-DC conversion circuit and
The signal amplification driving circuit is divided on different printed wiring boards or same printed wiring board.
8. a kind of MRI system characterized by comprising as gradient of any of claims 1-7 is put
Big device driving circuit.
9. a kind of test macro characterized by comprising as gradient amplifier of any of claims 1-7 drives
Circuit, the signal generator for generating the gtadient echo pulse, and, for receiving the load of the secondary signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610697223.7A CN106125024B (en) | 2016-08-19 | 2016-08-19 | MRI system and its gradient amplifier driving circuit, test macro |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610697223.7A CN106125024B (en) | 2016-08-19 | 2016-08-19 | MRI system and its gradient amplifier driving circuit, test macro |
Publications (2)
| Publication Number | Publication Date |
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| CN106125024A CN106125024A (en) | 2016-11-16 |
| CN106125024B true CN106125024B (en) | 2019-11-05 |
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| CN201610697223.7A Active CN106125024B (en) | 2016-08-19 | 2016-08-19 | MRI system and its gradient amplifier driving circuit, test macro |
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| CN109062158B (en) * | 2018-08-09 | 2021-01-05 | 中电九天智能科技有限公司 | Industrial robot assembly fault detection method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5270657A (en) * | 1992-03-23 | 1993-12-14 | General Electric Company | Split gradient amplifier for an MRI system |
| US5451878A (en) * | 1994-07-15 | 1995-09-19 | General Electric Company | Non-resonant gradient field accelerator |
| CN1745315A (en) * | 2003-02-03 | 2006-03-08 | 皇家飞利浦电子股份有限公司 | MRI precision gradient amplifier with multiple output voltage levels |
| CN102508183B (en) * | 2011-11-11 | 2013-09-11 | 辽宁开普医疗系统有限公司 | Digital variable frequency PWM (Pulse Width Modulation) gradient amplifier with adaptively-controlled load |
| CN102857184B (en) * | 2012-09-28 | 2015-03-04 | 电子科技大学 | Gradient amplifier control device |
| CN104950273A (en) * | 2014-03-28 | 2015-09-30 | 辽宁开普医疗系统有限公司 | Gradient amplifier applying coupled inductors to output filter |
| CN105301536A (en) * | 2015-11-05 | 2016-02-03 | 中国科学院电工研究所 | Gradient magnetic field generation method of magnetic resonance imaging system and device |
| CN205941863U (en) * | 2016-08-19 | 2017-02-08 | 深圳市正祥医疗科技有限公司 | Nuclear magnetic resonance imaging system and gradient amplifier drive circuit , test system thereof |
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