CN110208726A - For the detection system for the outside electromagnetic interference for influencing magnetic resonance system image quality - Google Patents
For the detection system for the outside electromagnetic interference for influencing magnetic resonance system image quality Download PDFInfo
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- CN110208726A CN110208726A CN201910475094.0A CN201910475094A CN110208726A CN 110208726 A CN110208726 A CN 110208726A CN 201910475094 A CN201910475094 A CN 201910475094A CN 110208726 A CN110208726 A CN 110208726A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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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
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/58—Calibration of imaging systems, e.g. using test probes, Phantoms; Calibration objects or fiducial markers such as active or passive RF coils surrounding an MR active material
- G01R33/583—Calibration of signal excitation or detection systems, e.g. for optimal RF excitation power or frequency
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Abstract
The present invention relates to a kind of detection systems for the outside electromagnetic interference for influencing magnetic resonance system image quality, including interference sample module array, primary filtering and sampling are carried out to extraneous multi-channel electromagnetic interference, and give multichannel interference data transmission to sample-information processing module；Sample-information processing module receives multichannel interference data and control parameter, calculates the interference data of magnetic resonance system scanning area, passes to communication transmission module；Communication transmission module is sent to sample-information processing module after receiving control parameter；Interference processing result is sent to host computer.The present invention can obtain the interference data of scanning area by being detected to the outside electromagnetic interference far from magnetic resonance system magnet body high magnetic field area, and interference data can be subjected to real-time Transmission, in order to which follow-up equipment utilizes the data to eliminate influence of the external interference to magnetic resonance system image quality in real time.
Description
Technical field
It is specifically a kind of for the outer of influence magnetic resonance system image quality the present invention relates to magnetic resonance system field
The detection system of boundary's electromagnetic interference.
Background technique
People promote flourishing for medical and health care system to the pursuit of health.Since 21 century, Magnetic resonance imaging
Technology is widely used with the advantages that its high-resolution, large information capacity, harmless inspection.
Magnetic resonance imaging system will obtain high quality graphic and need to rely on stable magnetic field.However magnetic resonance system equipment institute
There are several factors in the environment will affect the stabilization in scanning area magnetic field, such as 50Hz power current, large-scale electric equipment, vapour
The electromagnetic interference of the generations such as vehicle, elevator.The shielding device shielding that these electromagnetic interferences can not be used now, intensity are also remote small
In the magnetic field of magnetic resonance system magnet itself, so pinpoint accuracy can not be obtained by directly detecting the magnetic field in surface sweeping region
Data are interfered, these cannot be also eliminated and interfere the influence to magnetic resonance system image quality.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of for the external electromagnetic for influencing magnetic resonance system image quality
The detection system of interference, can be by examining the outside electromagnetic interference far from magnetic resonance system magnet body high magnetic field area
It surveys to obtain the interference data of scanning area, and interference data can be subjected to real-time Transmission, in order to which follow-up equipment is sharp in real time
Influence of the external interference to magnetic resonance system image quality is eliminated with the data.
Present invention technical solution used for the above purpose is:
A kind of detection system for the outside electromagnetic interference for influencing magnetic resonance system image quality, including
Interference sample module array connects sample-information processing module, for carrying out just to extraneous multi-channel electromagnetic interference
Grade filtering and sampling, and give multichannel interference data transmission to sample-information processing module；
Sample-information processing module connects sample-information processing module and communication module, for receiving interference sample module
The multichannel interference data that array is sent and the control parameter that communication transmission module is sent interfere number using control parameter processing multichannel
According to Phase Processing is handled and interfered by interference strength, calculates the interference data of magnetic resonance system scanning area, and will interference
Processing result passes to communication transmission module；
Communication transmission module connects sample-information processing module and host computer, for receiving the control ginseng of host computer transmission
Sample-information processing module is sent to after number；And the interference processing result that sample-information processing module is sent is sent to upper
Machine.
The interference sample module array is made of several interference sample modules, and each interference sample module includes interference
Sampling sensor, signal processing circuit and AD sample circuit；
The interference sample sensor is connected to signal processing circuit by shielded cable (length of cable is less than 20m), to
Signal processing circuit sends sensor signal；The signal processing circuit passes through instrument amplifier receiving sensor signal, biasing
It adjusts circuit and is directly connected to instrument amplifier bias input end, the signal after bias-adjusted passes through at filter circuit and amplifying circuit
AD sample circuit is given in output after reason；AD sampling front-end circuit, which is converted to the signal to be sampled received, meets ADC chip requirement
Differential signal, for ADC sampling after be output to data/address bus.
The interference sample sensor is used to acquire the electromagnetic signal of magnetic resonance system ambient enviroment, and electromagnetic signal includes ground
Magnetic signal, power frequency interference signals and random interfering signal；
The signal processing circuit is used to carry out sensor signal sampling pre-treatment, and sampling pre-treatment includes that biasing is adjusted
Section, low latency filtering and amplitude adjusted；
The AD sample circuit is used to carry out AD sampling to signal after processing, converts analog signals into digital signal.
The interference strength processing are as follows:
One-way interference sampling module sampled data is separated according to characteristic frequency first, then to same in multichannel interference data
Characteristic frequency ingredient is weighted summation process, obtains the interference data of scanning area this feature frequency, it may be assumed that
Wherein: f (x) indicates that feature interference signal strength data, x indicate that the index of characteristic frequency, k indicate sample
Index, akIndicate the comprehensive parameters of k-th of sampled point, bkIndicate x-th of characteristic frequency interference data of k-th of sampled point.
The characteristic frequency includes power frequency and its frequency multiplication, 0-5Hz low frequency and other influences NMR system scanning figure
The frequency content of image quality amount.
The interference Phase Processing are as follows: phase compensation is carried out to scanning area characteristic frequency interference data, it may be assumed that
A (x)=f (x)+Y (x)
Wherein: A (x) indicates that feature interference signal data, x indicate that the index of characteristic frequency, f (x) indicate x-th of feature frequency
Rate interference signal intensity data, Y (x) indicate x-th of characteristic frequency interference signal phase compensation data.
The communication transmission module includes high speed fiber optic data communication interface and USB Universal Serial Interface in real time；Its high speed is real
When fiber optic data communication interface for real-time Transmission high speed fiber optic communication interface data in real time；USB Universal Serial Interface is used for transmission USB
Universal Serial Interface data.
The real-time fiber optic communication interface data of high speed includes the control parameter and sample-information processing module of real-time change
Calculate the interference data of resulting each characteristic frequency.
The USB Universal Serial Interface data include interference sample module array status data, sample-information processing module
Result data after status data, each road interference sample module original sampling data and sample-information processing resume module.
The invention has the following beneficial effects and advantage:
1. the high accuracy data that the present invention can obtain magnetic resonance equipment scanning area electromagnetic interference；
2. the electromagnetic interference that the present invention can detecte multi-frequency ingredient in magnetic resonance equipment environment；
3. the invention detects that interference data can be with real-time Transmission to host computer, being conducive to the subsequent of detection data makes
With.
Detailed description of the invention
Fig. 1 is present system structure chart；
Fig. 2 is interference sample functions of modules schematic diagram of the present invention；
Fig. 3 is sample-information processing functions of modules schematic diagram of the present invention；
Fig. 4 is communication transmission module functional schematic of the present invention；
Fig. 5 is control parameter determination process schematic diagram of the present invention；
Fig. 6 is interference sample modular circuit structural schematic diagram of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and embodiments.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair
It is bright.But the present invention can be implemented in many other ways than those described herein, and those skilled in the art can not disobey
Similar improvement is done in the case where back invention intension, therefore the present invention is not limited to the specific embodiments disclosed below.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.It is specific that description is intended merely in the term used in the description of invention herein
Embodiment purpose, it is not intended that in limitation the present invention.
Present system structure chart is as shown in Figure 1, comprising:
Interference sample module array is made of multiple interference sample modules, more around magnetic resonance system equipment for acquiring
The electromagnetic interference signal of a position can increase and decrease according to the electromagnetic interference complexity of magnetic resonance system device context environment and interfere
Sampling module quantity.
Interference sample module is used to acquire the electromagnetic interference signal of single location, and function is realized as shown in Fig. 2, circuit knot
Structure is as shown in Figure 6.It is made of interference sample sensor, signal processing circuit and AD sample circuit.Interference sample sensor is logical
It crosses shielded cable (length of cable is less than 20m) and is connected to signal processing circuit.Signal processing circuit is received by instrument amplifier
Sensor signal, bias set circuti are connected directly to instrument amplifier bias input end, and the signal after bias-adjusted is through filtering
AD sample circuit is given in output after wave circuit and amplifying circuit processing.AD sampling front-end circuit converts the signal to be sampled received
For the differential signal for meeting ADC chip requirement, data/address bus is output to after sampling for ADC.Interference sample sensor is for acquiring
The electromagnetic signal of magnetic resonance system ambient enviroment, electromagnetic signal collected include Geomagnetic signal, power frequency interference signals and random
Interference signal, wherein the low frequency signal in power frequency interference signals and random interfering signal is can not to be shielded and will affect magnetic resonance
The electromagnetic interference of system scanning quality.Signal processing circuit is used to carry out sensor signal sampling pre-treatment, including biasing is adjusted
Section, low latency filtering and amplitude adjusted.Bias set circuti is used to eliminate the Geomagnetic signal part in interference signal, this earth magnetism letter
It number is a steady state value after sensor position is fixed.Low latency filter circuit is used to be filtered the interference letter after bias-adjusted
Number, the high frequency section that will not influence magnetic resonance equipment scanning quality is filtered out, this part high-frequency interferencing signal can be set by shielding
Standby isolation, or the influence to scanning quality is eliminated by sweep parameter.Meanwhile in order to guarantee the standard to aperiodicity interference signal
Really identification, needs to control filter delay within 1ms.Amplitude regulating circuit is used to amplify bias-adjusted and filters dry after adjusting
Signal is disturbed, it is made to make full use of the sampling interval of ADC sampling A/D chip as far as possible, to guarantee to know the high-precision of interference signal
Not.AD sample circuit is used to carry out AD sampling to interference signal after signal processing circuit, selects pure Differential Input, high-precision, height
Fast ADC chip prevents sample circuit from introducing extra interference, and accurate reproduction interference signal.Entire interference sample module uses
Low ripple, high stability power supply power supply reduces influence of the power supply noise to signal sampling.
Sample-information processing module is used for the comprehensive parameters integrated interference sampling module battle array transmitted according to communication transmission module
The multichannel interference signal of sampling is arranged, the feature interference data of NMR system scanning area are generated, function is realized such as Fig. 3 institute
Show, is separated by interference and interference processing two parts form.Wherein, interference separation is single for being decomposed according to interference signal characteristic frequency
Road ADC sampled data, obtains the interference information of each characteristic frequency of each sampled point.Characteristic frequency includes power frequency and its frequency multiplication, 0-5Hz
The random frequency ingredient of low frequency and other influences NMR system scan image quality.Interference processing according to comprehensive for joining
Number generates each feature interference signal of scanning area, and treatment process includes signal strength processing and signal phase processing, comprehensive ginseng
Number is determined by the distribution situation of each sampled point and the characteristic of each feature interference signal, can be inputted by communication transmission module.It is dry
Signal strength processing is disturbed to interfere the same characteristic frequency ingredient in data to be weighted summation process, calculation formula multichannel are as follows:
Wherein: f (x) indicates that feature interference signal strength data, x indicate that the index of characteristic frequency, k indicate sample
Index, akIndicate the comprehensive parameters of k-th of sampled point, bkIndicate x-th of characteristic frequency interference data of k-th of sampled point.Interference
Signal phase processing is to feature interference signal periodic in characteristic frequency interference signal progress phase compensation, calculation formula
Are as follows:
A (x)=f (x)+Y (x)
Wherein: A (x) indicates that feature interference signal data, x indicate that the index of characteristic frequency, f (x) indicate x-th of feature frequency
Rate interference signal intensity data, Y (x) indicate x-th of characteristic frequency interference signal phase compensation data；Characteristic frequency is interfered and is believed
Acyclic feature interference signal is directly output to next stage in number, to reduce the delay to this feature signal detection.Sampling
Message processing module needs to handle a variety of interference signal data of multiple spot, and data volume is big, complicated process steps, for guarantee pair
The timely processing of signal, this, which is used, can handle the FPGA of data with high-speed parallel to realize, to guarantee entire processing path
Delay is less than 1us.
Information exchange of the communication transmission module for control parameter and interference data, function are realized as shown in figure 4, by height
Fast fiber optic data communication interface in real time and USB Universal Serial Interface composition.Fiber optic data communication interface is used for transmission that treated to high speed in real time
Feature interference data and real-time control parameter can both guarantee the timely biography of real-time control parameter lower than the transmission delay of 100ns
Pass, feature interference data are extracted and reduction by true, and can will treated that feature interference data upload in time, be generalized
Compensation equipment or algorithm are for improving magnetic resonance system image quality.USB Universal Serial Interface is used for transmission each test point
The feature interference data and non real-time control parameter of original interference data, each test point.Wherein, respectively the original of test point does
Characteristic frequency ingredient of the data for Analysis interference signal is disturbed, each feature interference data for testing point are used for analytical sampling information
The comprehensive parameters that processing module uses.
The determination process of control parameter is as shown in Figure 5.The difference of the environment as locating for different magnetic resonance equipments, by
To interference be also not quite similar, so needing to analyze it according to the original interference data of each test point in the environment and will affect
The feature interference ingredient of scanning quality, and be input in entire detection system as a kind of non real-time control parameter.Meanwhile
According to the feature interference data of the distribution of each test point and each test point, magnetic resonance equipment scanning area in the present context is analyzed
The relationship of the feature interference signal in domain and the feature interference signal of each test point, obtains one group of comprehensive parameters, is used for detection system
System generates the feature interference data of scanning area.Then, actual verification is carried out using the scanning area feature interference data obtained,
Comprehensive parameters are corrected according to verification result.The process is repeated, until obtaining accurate scanning area feature interference data.
Claims (9)
1. a kind of detection system for the outside electromagnetic interference for influencing magnetic resonance system image quality, which is characterized in that including
Interference sample module array connects sample-information processing module, for carrying out primary filter to extraneous multi-channel electromagnetic interference
Wave and sampling, and give multichannel interference data transmission to sample-information processing module；
Sample-information processing module connects sample-information processing module and communication module, for receiving interference sample module array
The control parameter that the multichannel interference data and communication transmission module of transmission are sent interferes data using control parameter processing multichannel,
Phase Processing is handled and interfered by interference strength, calculates the interference data of magnetic resonance system scanning area, and will be at interference
Reason result passes to communication transmission module；
Communication transmission module connects sample-information processing module and host computer, after the control parameter for receiving host computer transmission
It is sent to sample-information processing module；And the interference processing result that sample-information processing module is sent is sent to host computer.
2. the detection system according to claim 1 for the outside electromagnetic interference for influencing magnetic resonance system image quality,
It is characterized by: the interference sample module array is made of several interference sample modules, each interference sample module includes
Interference sample sensor, signal processing circuit and AD sample circuit；
The interference sample sensor is connected to signal processing circuit by shielded cable, sends sensor to signal processing circuit
Signal；The signal processing circuit is directly connected to instrument and is put by instrument amplifier receiving sensor signal, bias set circuti
AD sample circuit is given in big device bias input end, the output after filter circuit and amplifying circuit processing of signal after bias-adjusted；
The signal to be sampled received is converted to the differential signal for meeting ADC chip requirement by AD sampling front-end circuit, after ADC sampling
It is output to data/address bus.
3. the detection system according to claim 2 for the outside electromagnetic interference for influencing magnetic resonance system image quality,
It is characterized by: the interference sample sensor is used to acquire the electromagnetic signal of magnetic resonance system ambient enviroment, electromagnetic signal packet
Include Geomagnetic signal, power frequency interference signals and random interfering signal；
The signal processing circuit is used to carry out sampling pre-treatment to sensor signal, and sampling pre-treatment includes bias-adjusted, low
Delay filtering and amplitude adjusted；
The AD sample circuit is used to carry out AD sampling to signal after processing, converts analog signals into digital signal.
4. the detection system according to claim 1 for the outside electromagnetic interference for influencing magnetic resonance system image quality,
It is characterized by: the interference strength processing are as follows:
One-way interference sampling module sampled data is separated according to characteristic frequency first, then to the same feature in multichannel interference data
Frequency content is weighted summation process, obtains the interference data of scanning area this feature frequency, it may be assumed that
Wherein: f (x) indicates that feature interference signal strength data, x indicate that the index of characteristic frequency, k indicate the rope of sample
Draw, akIndicate the comprehensive parameters of k-th of sampled point, bkIndicate x-th of characteristic frequency interference data of k-th of sampled point.
5. the detection system according to claim 4 for the outside electromagnetic interference for influencing magnetic resonance system image quality,
It is characterized by: the characteristic frequency includes power frequency and its frequency multiplication, 0-5Hz low frequency and the scanning of other influences NMR system
The frequency content of picture quality.
6. the detection system according to claim 1 for the outside electromagnetic interference for influencing magnetic resonance system image quality,
It is characterized by: the interference Phase Processing are as follows: carry out phase compensation to scanning area characteristic frequency interference data, it may be assumed that
A (x)=f (x)+Y (x)
Wherein: A (x) indicates that feature interference signal data, x indicate that the index of characteristic frequency, f (x) indicate that x-th of characteristic frequency is dry
Signal strength data is disturbed, Y (x) indicates x-th of characteristic frequency interference signal phase compensation data.
7. the detection system according to claim 1 for the outside electromagnetic interference for influencing magnetic resonance system image quality,
It is characterized by: the communication transmission module includes high speed fiber optic data communication interface and USB Universal Serial Interface in real time；Its high speed
Real-time fiber optic data communication interface is for the real-time Transmission high speed interface data of fiber optic communication in real time；USB Universal Serial Interface is used for transmission
USB Universal Serial Interface data.
8. the detection system according to claim 7 for the outside electromagnetic interference for influencing magnetic resonance system image quality,
It is characterized by: the real-time fiber optic communication interface data of high speed includes the control parameter and sample-information processing mould of real-time change
Block calculates the interference data of resulting each characteristic frequency.
9. the detection system according to claim 7 for the outside electromagnetic interference for influencing magnetic resonance system image quality,
It is characterized by: the USB Universal Serial Interface data include interference sample module array status data, sample-information processing mould
Result data after block status data, each road interference sample module original sampling data and sample-information processing resume module.
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