CN106125024A - Nuclear magnetic resonance imaging system and gradient amplifier drive circuit, test system - Google Patents
Nuclear magnetic resonance imaging system and gradient amplifier drive circuit, test system Download PDFInfo
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- CN106125024A CN106125024A CN201610697223.7A CN201610697223A CN106125024A CN 106125024 A CN106125024 A CN 106125024A CN 201610697223 A CN201610697223 A CN 201610697223A CN 106125024 A CN106125024 A CN 106125024A
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- 238000012360 testing method Methods 0.000 title claims abstract description 17
- 238000013421 nuclear magnetic resonance imaging Methods 0.000 title claims abstract description 8
- 230000003321 amplification Effects 0.000 claims abstract description 25
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 25
- 230000010355 oscillation Effects 0.000 claims description 11
- 230000005284 excitation Effects 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000003032 molecular docking Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 4
- 208000032767 Device breakage Diseases 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract description 2
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- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 238000002595 magnetic resonance imaging Methods 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
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- 238000005481 NMR spectroscopy Methods 0.000 description 2
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- 239000000523 sample Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
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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
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- 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
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- 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 nuclear magnetic resonance imaging system and gradient amplifier drive circuit, test system, wherein gradient amplifier drive circuit includes: DC change-over circuit；And, the signal amplification driving circuit being connected with DC change-over circuit, signal amplification driving circuit includes: for input interface and the output interface of output process gained secondary signal of input gradient echo impulse.So, when gradient amplifier breaks down, generally, fault is that high power device bursts and punctures corresponding drive circuit and causes gradient amplifier to burn out, at this moment can individually signal amplification driving circuit correspondence be picked out by interface from cabinet, in frock, breakdown maintenance test is done in additional power source, signal generator and load, the most convenient but also quick, has saved manpower and has shortened maintenance time.
Description
Technical field
The application relates to medical imaging field, particularly relates to nuclear magnetic resonance imaging system and gradient amplifier drives electricity
Road, test system.
Background technology
Gradient amplifier is NMR (Nuclear 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 produces the gradient of a linear transformation at imaging space
Magnetic field, differs in making imaging region everywhere, it is achieved magnetic field space encodes, in order to obtain high-quality image, it is desirable to gradient is put
Inductive load can be provided precision high and the current impulse of conversion by big device.
MRI powerful device such as gradient amplifier during running and using is one of the highest equipment of fault rate, due to
It is responsible for powering to gradient coil, and long-term work, under high pressure-temperature big electric current HF switch state, runs and various faults occurs
Risk of a relatively high, and in terms of phenomenon of the failure, more than 90% is all to be caused by signal amplification driving circuit, burns power supply and hits
Wear high power device and short-circuit, cause control module to be damaged and directly contribute magnetic resonance system series of problems, even if there being gradient to amplify
Device devises protection circuit, but gradient amplifier can not be avoided completely significant trouble occur in the case of nanosecond.Gradient
Amplifier apparatus is expensive, and its fault will result in the economic loss that cannot retrieve.
At present, the signal amplification driving circuit of all gradient amplifiers is fully integrated on an overall pcb board inseparable
Cut and dismantle, also do not have signal and power interface to connect the power supply of outside, signal generator and load and be simulated test, dimension
Have no way of doing it when repairing.It is all to need charged and external signal to make on-line testing in the case of a lot.Due to the superior and the subordinate or front stage
Circuit is inseparable, the most often other circuit is produced sensing and interferes, being unfavorable for breakdown judge and fault location, always
This integral structure be unfavorable for test and maintenance.
Summary of the invention
The application is intended to solve the detection of above-mentioned magnetic resonance gradient amplifier and a maintenance technique difficult problem to a certain extent.
According to the first aspect of the application, the application provides a kind of gradient amplifier drive circuit, including:
For producing the DC-to-dc change-over circuit of working power；And,
That be connected with described DC-to-dc change-over circuit, for described working power power lower to outside input gradient return
Wave impulse is amplified processing and export the signal amplification driving circuit processing gained secondary signal,
Described signal amplification driving circuit includes: for inputting the input interface of described gtadient echo pulse and exporting described time
The output interface of level signal.
Further, described DC-to-dc change-over circuit includes:
Pulse width modulation chip is recommended, described first switch for produce that the first switch oscillating involves the second switch wave of oscillation
The wave of oscillation is anti-phase with the described second switch wave of oscillation；
With described recommend that pulse width modulation chip is connected, first high for what described first switch oscillating ripple was amplified
Speed drives pipe；
With described recommend that pulse width modulation chip is connected, second high for what the described second switch wave of oscillation was amplified
Speed drives pipe；
Having first input end, the second input and the high frequency transformer of the first outfan, described first high-speed driving pipe is simultaneously
Docking with described first input end, described second high-speed driving pipe docks with described second input simultaneously；
The current rectifying and wave filtering circuit being connected with described first outfan；And,
The voltage-regulating circuit that described current rectifying and wave filtering circuit is simultaneously connected to.
Further, described DC-to-dc change-over circuit also includes:
It is additionally provided with between described first high-speed driving pipe and described first input end and couples electric capacity；And,
It is additionally provided with excitation inductance between described second high-speed driving pipe and described second input.
Further, described DC-to-dc change-over circuit also includes:
It is additionally provided with between described second high-speed driving pipe and described second input and couples electric capacity；And,
It is additionally provided with excitation inductance between described first high-speed driving pipe and described first input end.
Further, described signal amplification driving circuit includes:
For being the photoelectrical coupler of ripple by described gtadient echo pulses switch；
That be connected with described photoelectrical coupler, for the 3rd high-speed driving pipe that described ripple is amplified；
That be connected with described photoelectrical coupler, for the 4th high-speed driving pipe that described ripple is amplified；And,
Having the 3rd input, four-input terminal and the synthesizer of the second outfan, described 3rd high-speed driving pipe passes through simultaneously
One resistance docks with described 3rd input with diodes in parallel branch road, and described 4th high-speed driving pipe is simultaneously 4th defeated with described
Enter end docking.
Further, described diode is Schottky diode.
Further, described input interface and described output interface are collectively forming single single row direct insert interface.
Further, described DC-to-dc change-over circuit and described signal amplification driving circuit are divided into different track
On road plate or same printed wiring board.
According to the second aspect of the application, the application provides a kind of nuclear magnetic resonance imaging system, including: gradient described above
Amplifier drive circuit.
According to the third aspect of the application, the application provides a kind of test system, including: gradient amplifier described above drives
Galvanic electricity road, for producing the signal generator of described gtadient echo pulse, and, for receiving the load of described secondary signal.
The application provides the benefit that:
By providing a kind of nuclear magnetic resonance imaging system and gradient amplifier drive circuit, test system, wherein, gradient is amplified
Device drive circuit includes: DC-to-dc change-over circuit；And, the signal being connected with DC-to-dc change-over circuit amplifies driving electricity
Road, signal amplification driving circuit includes: input interface and output for input gradient echo impulse process gained secondary letter
Number output interface.So, when gradient amplifier breaks down, generally, fault is that high power device bursts and hits
Wear corresponding drive circuit to cause burning out, at this moment can individually corresponding for signal amplification driving circuit passing through from cabinet be connect
Mouth picks out, and in frock, maintainability test is made in additional power source, signal generator and load, it is achieved accurate to fault degree amplifier circuit
Judgement and detection, greatly improve fault gradient amplifier maintenance efficiency.The method is the most convenient but also quick, has saved manpower
Shorten maintenance time.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of DC-to-dc change-over 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 drive circuit of the embodiment of the present application.
Detailed description of the invention
Embodiments herein is described below in detail, and the example of described embodiment is shown in the drawings, the most from start to finish
Same or similar label represents same or similar element or has the element of same or like function.Below with reference to attached
The embodiment that figure describes is exemplary, it is intended to be used for explaining the application, and it is not intended that restriction to the application.
In the description of the present application, it is to be understood that term " " center ", " longitudinally ", " laterally ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward ", " up time
Pin ", the orientation of the instruction such as " counterclockwise " or position relationship be based on orientation shown in the drawings or position relationship, be for only for ease of
Describe the application and simplification description rather than instruction or the device of hint indication or element must have specific orientation, Yi Te
Fixed azimuth configuration and operation, therefore it is not intended that restriction to the application.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include one or more this feature.In the description of the present application, " multiple " are meant that two or more,
Unless otherwise expressly limited specifically.
In this application, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " fixing " etc.
Term should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or be integrally connected；It can be machine
Tool connects, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two units
Connection within part.For the ordinary skill in the art, can understand that above-mentioned term is in this Shen as the case may be
Concrete meaning in please.
In this application, unless otherwise clearly defined and limited, fisrt feature second feature it " on " or D score
Can include that the first and second features directly contact, it is also possible to include that the first and second features are not directly contact but by it
Other characterisation contact between.And, fisrt feature second feature " on ", " top " and " above " include that first is special
Levy directly over second feature and oblique upper, or be merely representative of fisrt feature level height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " below " include that fisrt feature immediately below second feature and obliquely downward, or is merely representative of
Fisrt feature level height is less than second feature.
Combine accompanying drawing below by detailed description of the invention the application is described in further detail.
The present embodiment provides a kind of gradient amplifier drive circuit, including:
For producing the DC-to-dc change-over circuit of working power；And,
That be connected with DC-to-dc change-over circuit, for working power power lower to outside input gtadient echo pulse enter
Row processing and amplifying also exports the signal amplification driving circuit processing gained secondary signal.
Wherein, signal amplification driving circuit includes: for input interface and the output secondary of input gradient echo impulse
The output interface of signal.
With reference to Fig. 1, DC-to-dc change-over circuit includes:
Recommending pulse width modulation chip 1 for produce that the first switch oscillating involves the second switch wave of oscillation, the first switch shakes
Swing ripple anti-phase with the second switch wave of oscillation；
That pulse width modulation chip U1 is connected, for the first high-speed driving that the first switch oscillating ripple is amplified with recommending
Pipe U2；
That pulse width modulation chip 1 is connected, for the second high-speed driving that the second switch wave of oscillation is amplified with recommending
Pipe U3；
There is the high frequency transformer T1 of first input end, the second input and the first outfan, the first high-speed driving pipe U2 simultaneously
Docking with first input end, the second high-speed driving pipe U3 docks with the second input simultaneously；
The current rectifying and wave filtering circuit D1 being connected with the first outfan；And,
The voltage-regulating circuit VR2 that current rectifying and wave filtering circuit D1 is simultaneously connected to.
In the present embodiment, DC-to-dc change-over circuit also includes:
It is additionally provided with between first high-speed driving pipe U2 and first input end and couples electric capacity C1；And,
Excitation inductance L1 it is additionally provided with between second high-speed driving pipe U3 and the second input.
In other embodiments, DC-to-dc change-over circuit also includes:
Coupling electric capacity C1 it is additionally provided with between second high-speed driving pipe U3 and the second input；And,
Excitation inductance L1 it is additionally provided with between first high-speed driving pipe U2 and first input end.
And signal amplification driving circuit includes:
For by photoelectrical coupler PH2 that gtadient echo pulses switch is ripple；
That be connected with photoelectric coupling PH2, for the 3rd high-speed driving pipe U10 that ripple is amplified；
That be connected with photoelectrical coupler PH2, for the 4th high-speed driving pipe U11 that ripple is amplified；And,
There is the synthesizer OUT WF of the 3rd input, four-input terminal and the second outfan, the 3rd high-speed driving pipe U10 simultaneously
Being docked with the 3rd input with diode D3 parallel branch by a resistance R3, the 4th high-speed driving pipe U11 is the most defeated with the 4th
Enter end docking.
Diode D3 can use Schottky diode.
Input interface and output interface are collectively forming single single row direct insert interface J, as shown in Figure 3.
DC-to-dc change-over 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 for a kind of nuclear magnetic resonance imaging system, including: gradient amplifier drive circuit described above, with
And gradient coil etc..
The present embodiment also provides for a kind of test system, including: gradient amplifier drive circuit described above, is used for producing ladder
The signal generator of degree echo impulse, and, for receiving the load of secondary signal.
The application of the present embodiment is described below by an instantiation.
Gradient amplifier drive circuit can include DC-to-dc conversion (DC-DC CONVERTER) circuit and GATE signal
Amplification drive signal circuit, and corresponding connector etc..The most convenient simple and clear installation but also convenient maintenance.
Part I DC-DC CONVERTER circuit:
Use+15V DC source to provide power supply, be converted to power to whole circuit for+12V after three-terminal voltage-stabilizing, circuit core
Parts are to recommend pulse width modulation (Push-pull Pulse Width Modulation, PPPWM) integrated circuit.PPPWM
Being one piece of BICMOS fabric chip, comprise required driving control circuit, its peripheral cell is few, can export and recommend pulse at a high speed
Wide modulation waveform.
Its operation principle is shown in Fig. 1, and the RC vibration in PPPWM produces sawtooth waveforms, OUTA and OUTB exports the wheel of reversion respectively
Stream 1/2 switch oscillating frequency waveform alternately, both waveform duty cycle ＜ 50%.OUTA and OUTB waveform respectively through U2～U3,
U3～U4 high-speed driving pipe strengthens amplification, coupling electric capacity, encourages inductance, high frequency transformer, the generation of final rectified filter circuit+
12V ,+12V pass through VR2～VR3 Voltage Cortrol output+5V(VCC), above circuit constitutes DC-DC CONVERTER circuit.
Part II GATE signal amplification drive signal circuit:
It is that various gradient sequence waveform is through photoelectric coupling integrated circuit, high-speed driving chip, Schottky diode, resistance etc.
Pcb board and connector composition.
Its operation principle is shown in Fig. 2, and the spectrometer that various sequences control through computer produces pulse signal, is turned by interlock circuit
Change (3.5Vpp) TTL digital level into, then after PH1～PH2 photoelectrical coupler, obtain the ripple waveform warp of almost nil electric current
The amplification of U6～U7, U8～U9, U10～U11, U12～U13 high-speed driving pipe rises to 25Vpp and is then sent through the G pole of metal-oxide-semiconductor to end
Level amplifier provides waveform.
Related commissioning instrument, signal generator, oscillograph and relevant speciality test probe composition test system.
As it is shown on figure 3, circuit diagram is converted into components and parts figure and generates PCB, Fig. 1 and Fig. 2 two parts circuit can be tied
It is exactly that we common PCB is in kind that conjunction is integrated on one piece of PCB.
On whole PCB, components and parts use surface encapsulation components and parts, and integral layout has been saved reduced space PCB volume, J1
～J6 is signal input and output interface, they realize between GATE DRIVER PCB and GRADIENT POWER PCB
Communication, structure have employed single single row direct insert mouthpiece.
Use plastic buckle by H1～H3, GATE DRIVER PCB is fixed in frame, it is to avoid metal screws and its
Its component contact brings interference signal, is also convenient for dismounting simultaneously, and so convenient test and maintenance, Whole PC B uses several plastics
Buckle is fixedly mounted in frame to be avoided using metal screws inductive grounding problem, uses plastic buckle freely to regulate
Distance between PCB and connector but also can be with shock-absorbing etc..
Most importantly convenient maintenance, so, when gradient amplifier breaks down, generally, fault is big merit
Rate device bursts and punctures corresponding drive circuit and causes burning out, at this moment can be individually that signal amplification driving circuit is corresponding
Being picked out by interface from cabinet, in frock, maintainability test is made in additional power source, signal generator and load, the most convenient but also fast
Victory, has saved manpower and has shortened maintenance time.
In the description of this specification, reference term " embodiment ", " some embodiments ", " an enforcement
Example ", " some embodiments ", " example ", the description of " concrete example " or " some examples " etc. mean to combine this embodiment or example
The specific features, structure, material or the feature that describe are contained at least one embodiment or the example of the application.In this explanation
In book, the schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example.And, the concrete spy of description
Levy, structure, material or feature can combine in any one or more embodiments or example in an appropriate manner.
Above content is to combine the further description that the application is made by specific embodiment, it is impossible to assert this Shen
Being embodied as please is confined to these explanations.For the application person of an ordinary skill in the technical field, do not taking off
On the premise of the application conceives, it is also possible to make some simple deduction or replace.
Claims (10)
1. a gradient amplifier drive circuit, it is characterised in that including:
For producing the DC-to-dc change-over circuit of working power；And,
That be connected with described DC-to-dc change-over circuit, for described working power power lower to outside input gradient return
Wave impulse is amplified processing and export the signal amplification driving circuit processing gained secondary signal,
Described signal amplification driving circuit includes: for inputting the input interface of described gtadient echo pulse and exporting described time
The output interface of level signal.
2. gradient amplifier drive circuit as claimed in claim 1, it is characterised in that described DC-to-dc change-over circuit bag
Include:
Pulse width modulation chip is recommended, described first switch for produce that the first switch oscillating involves the second switch wave of oscillation
The wave of oscillation is anti-phase with the described second switch wave of oscillation；
With described recommend that pulse width modulation chip is connected, first high for what described first switch oscillating ripple was amplified
Speed drives pipe；
With described recommend that pulse width modulation chip is connected, second high for what the described second switch wave of oscillation was amplified
Speed drives pipe；
Having first input end, the second input and the high frequency transformer of the first outfan, described first high-speed driving pipe is simultaneously
Docking with described first input end, described second high-speed driving pipe docks with described second input simultaneously；
The current rectifying and wave filtering circuit being connected with described first outfan；And,
The voltage-regulating circuit that described current rectifying and wave filtering circuit is simultaneously connected to.
3. gradient amplifier drive circuit as claimed in claim 2, it is characterised in that described DC-to-dc change-over circuit is also
Including:
It is additionally provided with between described first high-speed driving pipe and described first input end and couples electric capacity；And,
It is additionally provided with excitation inductance between described second high-speed driving pipe and described second input.
4. gradient amplifier drive circuit as claimed in claim 2, it is characterised in that described DC-to-dc change-over circuit is also
Including:
It is additionally provided with between described second high-speed driving pipe and described second input and couples electric capacity；And,
It is additionally provided with excitation inductance between described first high-speed driving pipe and described first input end.
5. gradient amplifier drive circuit as claimed in claim 1, it is characterised in that described signal amplification driving circuit bag
Include:
For being the photoelectrical coupler of ripple by described gtadient echo pulses switch；
That be connected with described photoelectrical coupler, for the 3rd high-speed driving pipe that described ripple is amplified；
That be connected with described photoelectrical coupler, for the 4th high-speed driving pipe that described ripple is amplified；And,
Having the 3rd input, four-input terminal and the synthesizer of the second outfan, described 3rd high-speed driving pipe passes through simultaneously
One resistance docks with described 3rd input with diodes in parallel branch road, and described 4th high-speed driving pipe is simultaneously 4th defeated with described
Enter end docking.
6. gradient amplifier drive circuit as claimed in claim 5, it is characterised in that described diode is Schottky two pole
Pipe.
7. gradient amplifier drive circuit as claimed in claim 1, it is characterised in that described input interface and described output connect
Mouth is collectively forming single single row direct insert interface.
8. gradient amplifier drive circuit as claimed in claim 1, it is characterised in that described DC-to-dc change-over circuit and
Described signal amplification driving circuit is divided on different printed wiring boards or same printed wiring board.
9. a nuclear magnetic resonance imaging system, it is characterised in that including: the gradient as according to any one of claim 1-8 is put
Big device drive circuit.
10. a test system, it is characterised in that including: the gradient amplifier as according to any one of claim 1-8 drives
Circuit, for producing the signal generator of described gtadient echo pulse, and, for receiving the load of described secondary signal.
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| CN201610697223.7A CN106125024B (en) | 2016-08-19 | 2016-08-19 | MRI system and its gradient amplifier driving circuit, test macro |
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| CN201610697223.7A CN106125024B (en) | 2016-08-19 | 2016-08-19 | MRI system and its gradient amplifier driving circuit, test macro |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109062158A (en) * | 2018-08-09 | 2018-12-21 | 中电九天智能科技有限公司 | Industrial robot assembles method for detecting fault |
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