CN108776251B - Induced potential measurement method and system - Google Patents
Induced potential measurement method and system Download PDFInfo
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- CN108776251B CN108776251B CN201810276653.0A CN201810276653A CN108776251B CN 108776251 B CN108776251 B CN 108776251B CN 201810276653 A CN201810276653 A CN 201810276653A CN 108776251 B CN108776251 B CN 108776251B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/362—Heart stimulators
- A61N1/37—Monitoring; Protecting
- A61N1/3718—Monitoring of or protection against external electromagnetic fields or currents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/38—Applying electric currents by contact electrodes alternating or intermittent currents for producing shock effects
- A61N1/39—Heart defibrillators
- A61N1/3925—Monitoring; Protecting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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Abstract
The application provides a kind of induced potential measurement method and system, by the temperature voltage relationship for obtaining the Medical Instruments, to calculate the induced potential for obtaining the output end of the Medical Instruments and generating in alternating magnetic field, induced potential bring error, accuracy with higher are measured by cable so as to avoid using voltage measuring apparatus.
Description
Technical field
This application involves the field of medical instrument technology more particularly to a kind of alternating electromagnetisms induced potential amount method and to be off field
System.
Background technique
There are many implantation medical equipment type, such as pacemaker and defibrillator, embedded nerve stimulator, implanted flesh
Meat stimulator etc..These medical instruments are by applying certain electric pulse to bodily tissue, to reach treatment, mitigate patient's disease
The purpose of disease.
With advances in technology, Nuclear Magnetic Resonance increasingly becomes a kind of conventional detection means.For example, for receiving brain
For the disturbances in patients with Parkinson disease of deep stimulation (deep brain stimulation, DBS) therapeutic scheme treatment, postoperative program-controlled ginseng
Number usually requires the position of reference electrode.Therefore, carrying out postoperative scanning nuclear-magnetism to the disturbances in patients with Parkinson disease for receiving DBS treatment is very
It is necessary.In addition, being equipped with the patient of implantation medical equipment even without in the inspection of the disease, other illnesss is being carried out
When inspection, nuclear magnetic scanning can be also used.Due to having changing magnetic field during nuclear magnetic scanning, for using implantable medical instrument
The patient of device, changing magnetic field can cause the raising of medical instrument metal spot temperature, and induce induced potential.The temperature rise
On induced potential load patient tissue, certain damage may be caused to the tissue of patient.Therefore, for being equipped with implantation
For the patient of formula Medical Instruments, nuclear magnetic scanning can generate a kind of potential danger.In order to eliminate the raised danger of temperature, the U.S.
Material and test association (ASTM) provide body mould model criteria for simulating human body.Implantation medical equipment can be implanted into institute
Body mould is stated, and nuclear magnetic scanning is carried out to the body mould.Then, nuclear-magnetism is scanned by body mould simulated medical instrument and measures temperature rise, thus
It prejudges nuclear magnetic scanning and bring risk is increased by temperature.
In traditional technology, the metal position that the implantation medical equipment in body mould can be directly measured by oscillograph is inducted
Voltage.Referring to Figure 1, in order to measure induced potential of the brain pacemaker system under nuclear-magnetism.Oscillograph can be placed on to nuclear-magnetism room
Outside, contact in pacemaker shell or top cover is connected with one end of coaxial cable, with outside the other end connection nuclear-magnetism room of coaxial cable
Oscillograph.Then, the induced potential that brain pacemaker system generates in nuclear magnetic scanning is detected by oscillograph.However,
In actual measurement, since the alternating magnetic field that nuclear magnetic scanning generates also can be in coaxial cable and pacemaker coupling part and coaxial line
Induced potential is generated on cable, this part induced potential, which is mixed into final measurement, can cause uncompensable errors.In addition, nuclear-magnetism is penetrated
The induced potential of frequency field is about 64MHz (1.5T nuclear-magnetism) or 128MHz (3T nuclear-magnetism), and high frequency voltage requires in transmission process
Impedance matching.In fact, the pulse that medical instrument issues is less than 1KHz mostly, it is defeated radio frequency is not related in normal use process
Out, impedance matching will not be done.In summary consider, traditional technology directly measures implantation medical equipment and produces in superpower alternating magnetic field
It is that the method for raw induced potential obtains the result is that inaccuracy, and error is difficult to estimation control.
Summary of the invention
Based on this, it is necessary in view of the above technical problems, truly have and provide a kind of measurement side of more accurate and reliable induced potential
Method and system, the potential risk in order to accurate evaluation nuclear magnetic scanning to the patient for using implantation medical equipment.
A kind of induced potential measuring system, the induced potential generated in alternating magnetic field for measuring Medical Instruments are described
Medical Instruments includes conductor part, and the output end connecting with the conductor part, comprising:
Temperature measuring device, when being in alternating magnetic field to measure the Medical Instruments, the first temperature of the output end
When degree increment and the Medical Instruments are not in alternating magnetic field, the second temperature increment of the output end；
Voltage provides device, to apply to the Medical Instruments when the Medical Instruments is not in alternating magnetic field
Alternating voltage is so that output end heating reaches the second temperature increment, when the pulse envelope of the alternating voltage, unit
Interior pulse number and pulsewidth and the pulse envelope of the alternating magnetic field, the pulse number in the unit time and pulsewidth phase
Together；
The induced potential computing device that device is connect is provided with the temperature-sensing device and the voltage, to according to more
The voltage magnitude of a second temperature increment alternating voltage corresponding with the multiple second temperature increment obtains voltage magnitude
With the temperature voltage corresponding relationship of temperature increment, and first temperature increment calculated according to the temperature voltage corresponding relationship
Corresponding voltage magnitude.
A kind of measurement method of induced potential, the induced potential generated in alternating magnetic field for measuring Medical Instruments, institute
The output end that Medical Instruments includes conductor part and connect with the conductor part is stated, the measurement method includes following step
It is rapid:
Apply alternating magnetic field to the Medical Instruments, obtains the first temperature increment of the output end, first temperature
Increment is described in the temperature and the Medical Instruments when output end reaches stable state in the alternating magnetic field are not in
The difference of temperature when in alternating magnetic field；
The alternating magnetic field for being applied to the Medical Instruments is closed, applies alternating voltage so that described defeated to the Medical Instruments
Outlet heating, the pulse envelope of the alternating voltage, the pulse number in the unit time and pulsewidth are identical as the alternating magnetic field；
Obtain multiple second temperature increments of the corresponding output end of different voltages amplitude of the alternating voltage；
The second temperature increment and institute are obtained according to the multiple second temperature increment and the different voltages amplitude
The temperature voltage corresponding relationship of voltage magnitude is stated, and first temperature increment pair is calculated according to the temperature voltage corresponding relationship
The voltage magnitude answered.
The measurement method of induced potential measuring system provided by the present application and induced potential, by obtaining the medical instrument
The temperature voltage relationship of device, to calculate the induced potential for obtaining the output end of the Medical Instruments and generating in alternating magnetic field, from
And it avoids and induced potential bring error, accuracy with higher is measured by cable using voltage measuring apparatus.
Detailed description of the invention
Fig. 1 is the method schematic diagram for the induced potential that measurement Medical Instruments generates in nuclear magnetic resonance in traditional technology；
Fig. 2 is the application environment schematic diagram of the induced potential measuring system in the application one embodiment；
Fig. 3 is the structural schematic diagram of induced potential measuring system in the application one embodiment；
Fig. 4 is that the temperature measuring device of induced potential measuring system in the application one embodiment measures output end temperature
Schematic diagram；
Fig. 5 provides device for the voltage of induced potential measuring system in the application one embodiment and applies electricity to Medical Instruments
The schematic diagram of pressure；
Fig. 6 is the RF pulse envelope of the alternating magnetic field obtained according to the MRI scan sequence of nuclear magnetic resonane scanne
Figure；
Fig. 7 is that the voltage measuring apparatus of induced potential measuring system in the application one embodiment measures the Medical Instruments
Original induced potential schematic diagram；
Fig. 8 is the flow chart of induced potential measurement method in the embodiment of the present application；
Fig. 9 is second temperature increment and induced potential magnitude relation curve graph in the embodiment of the present application.
Component symbol explanation
Induced potential measuring system 10
Body mould 110
Medical Instruments 120
Impulse generator 122
Conductor part 124
Output end 126
Temperature measuring device 130
Optical fiber temperature-measurement device 132
Temperature indicator 134
Optical fiber 136
Voltage measuring apparatus 140
Oscillograph 142
Coaxial cable 144
Voltage provides device 150
Signal generator 152
Power amplifier 154
Induced potential computing device 160
Specific embodiment
In order to which the objects, technical solutions and advantages of the application are more clearly understood, below in conjunction with attached drawing to the application's
Induced potential measurement method and system are described.It should be appreciated that specific embodiment described herein is only used to explain this
Application is not used to limit the application.
Fig. 2-4 is referred to, the embodiment of the present application provides a kind of induced potential measuring system 10, for measuring Medical Instruments
120 induced potentials generated in alternating magnetic field.The Medical Instruments 120 include conductor part 124, and with the conductor portion
The output end 126 of part connection.The induced potential measuring system 10 includes:
Temperature measuring device 130, when being in alternating magnetic field for measuring the Medical Instruments 120, the output end 126
The first temperature increment and the Medical Instruments 120 when being not in alternating magnetic field, the second temperature of the output end 126
Increment；
Voltage provides device 150, for giving the medical instrument when the Medical Instruments 120 is not in alternating magnetic field
Device 120 applies alternating voltage so that the heating of the output end 126 reaches the second temperature increment, the pulse of the alternating voltage
Envelope, pulse number and pulse envelope, the pulse number in the unit time of pulsewidth and the alternating magnetic field in the unit time
And pulsewidth is identical；
The induced potential computing device 160 that device 150 is connect is provided with the temperature-sensing device 130 and the voltage,
For being obtained according to the voltage magnitude of multiple second temperature increments alternating voltage corresponding with the multiple second temperature increment
It takes the temperature voltage corresponding relationship of voltage magnitude and temperature increment, and calculates described the according to the temperature voltage corresponding relationship
The corresponding voltage magnitude of one temperature increment.
The Medical Instruments 120 can be the implantation medical equipment of various implantation human bodies, including and be not limited to heart
It fights device and defibrillator, embedded nerve stimulator and implanted muscle stimulator.The alternating magnetic field can be to be total to by nuclear-magnetism
The scanner that shakes carries out the superpower alternating magnetic field of generation when nuclear magnetic scanning.The Medical Instruments 120 includes impulse generator 122, leads
Body component 124 and output end 126.The conductor part 124 is connect with the impulse generator 122 and the output end 126.
The pulse signal that the impulse generator 122 issues passes to the output end 126 by the conductor part 124 and passes through described
Output end 126 is applied to human body.The Medical Instruments 120 can be implanted in body mould 110.There is class in the body mould 110
Like the environment of tissue, so as to simulate the et al. Ke environment of human body.
The body mould 110 can be placed in the scanning room of nuclear magnetic resonane scanne, when opening scanning, the body mould
110 in alternating magnetic field.It is described in the body mould 110, the Medical Instruments 120 is in the output end 126 and the arteries and veins
It rushes between generator 122 and forms loop.When the Medical Instruments 120 is in the alternating magnetic field, the loop, which can generate, inducts
Electric current increases so as to cause the temperature of the output end 126.The output end 126 can be multiple metal electrodes.In a reality
It applies in example, when the Medical Instruments 120 is brain pacemaker, the output end 126 is two electrodes for having hard contact.Institute
When stating the setting of output end 126 in the body mould 110, due to being filled with gel tissue in the body mould 110, so that the output
There is impedance between end 126 and the shell of the impulse generator 122.This impedance can be defined as the output end 126
Impedance.
The temperature measuring device 130 is used to measure the temperature of the output end 126.The temperature measuring device 130 is not
Limit, can be the various temperature measuring equipments not influenced by alternating magnetic field.Fig. 4 is referred to, in one embodiment, the temperature measurement
Device 130 includes optical fiber temperature-measurement device 132 and the temperature indicator 134 connecting with the optical fiber temperature-measurement device 132.The optical fiber
Thermal detector 132 measures the temperature of the output end 126 by optical fiber 136.The temperature indicator 134 is for showing the optical fiber
The measurement result of thermal detector 132.The temperature that the output end 126 is measured by the optical fiber temperature-measurement device 132, due to optical fiber
136 not will receive the influence of the alternating magnetic field, to accurately obtain temperature-measuring results.Specifically, the body mould 110 is being put into
After the scanning chamber for stating nuclear magnetic resonane scanne, the nuclear magnetic resonane scanne will be scanned the body mould 110, to give
The body mould 110 applies alternating magnetic field.
In the alternating magnetic field, the metal part in the Medical Instruments 120 can generate induced potential, and with it is described
Liquid forming circuit in body mould 110.Under induced potential effect, the output end 126 has hair caused by electromagnetic field
Heat, so that the output end 126 can be caused to heat up.The optical fiber temperature-measurement device 132 can be sensed described by the optical fiber 132
The temperature of output end 126.Temperature of the output end 126 in no application alternating current magnetic field is room temperature temperature.It is described defeated
Outlet 126 can be warming up to stable state under alternating current magnetic field effect.The temperature of the output end 126 when the stable state
Degree and the difference of the room temperature temperature are defined as first temperature increment.The optical fiber temperature-measurement device 132 can measure described
One temperature increment, and shown in the temperature indicator 134.It is appreciated that the alternating current magnetic field can pass through core
Magnetic resonance scanner provides.For example, when the scanning that the body mould 110 enters the nuclear magnetic resonane scanne is intracavitary, if opening
The scanning function of the nuclear magnetic resonane scanne, the body mould 110 will be in alternating magnetic field.When the closing nuclear magnetic resonance
When the scanning function of scanner, the body mould 110 is at the state for not applying alternating magnetic field, thus the Medical Instruments 120
Just it is not in alternating magnetic field.
Fig. 5 is referred to, the voltage provides device 150 and is used to provide alternating voltage to the Medical Instruments 120, so that institute
The output end 126 for stating Medical Instruments 120 heats up.The voltage provides the pulse envelope for the alternating voltage that device 150 provides, unit
Pulse envelope, the pulse number and pulsewidth in the unit time of pulse number and pulsewidth and the alternating magnetic field in time
It is identical.The voltage provide the alternating voltage that device 150 provides frequency can it is identical with the frequency of the alternating magnetic field or
It is different.The alternating voltage of different amplitudes is provided to the Medical Instruments 120, can make the Medical Instruments 120 that there is difference
Second temperature increment.Specifically, the amplitude for the alternating voltage that device 150 exports can be provided by adjusting the voltage to adjust
The whole Medical Instruments 120 increases multiple and different temperature, to obtain multiple and different second temperature increments.
Refer to Fig. 5, in one embodiment, the voltage provide device 150 include signal generator 152, with it is described
The power amplifier 154 that signal generator 152 connects.The power amplifier 154 is applied by conducting wire to the Medical Instruments 120
Add the alternating voltage.The pulse envelope for the alternating voltage signal that in one embodiment, the signal generator 152 generates,
Pulse envelope, the pulse number and pulsewidth in the unit time of pulse number and pulsewidth and the alternating magnetic field in unit time
It is identical.The alternating voltage signal that the power amplifier 154 is used to generate the signal generator 152 amplifies.Specifically, may be used
Alternating voltage to be applied between the output end 126 and pulse signal generator 122 of the Medical Instruments 120 by conducting wire.
That is, an electrode connects the output end 126, another electrode connects the shell of the pulse signal generator 122
On body.Above-mentioned two electrode is connect by conducting wire with the output of the power amplifier 154.Logical to the Medical Instruments 120
When electric, the temperature of the output end 126 can be by 130 real-time measurement of temperature measuring device, it is hereby achieved that being applied to
The corresponding second temperature increment of the amplitude of alternating current in the Medical Instruments 120.
The induced potential computing device 160 is the intelligent terminal with computing function.The induced potential computing device
160, which provide device 150 with the temperature measuring device 130 and the voltage, is electrically connected.The induced potential computing device 160 can
To provide the voltage magnitude that device 150 is applied to the alternating current in the Medical Instruments 120 according to the voltage, and by described
The second temperature increment of the corresponding output end 126 of the voltage magnitude for the alternating current that temperature measuring device 130 measures,
Obtain the temperature voltage corresponding relationship curve of the second temperature increment Yu the voltage magnitude.The induced potential computing device
160 can also calculate the corresponding voltage magnitude of first temperature increment according to the temperature voltage corresponding relationship curve.It is described
First temperature increment is the induced potential bring temperature increment generated by the alternating current magnetic field, and first temperature increment is corresponding
Voltage magnitude be exactly the induced potential voltage magnitude.Also, the frequency due to the induced potential, pulse envelope, list
In the time of position pulse number and pulsewidth with the frequency of the alternating current magnetic field, pulse envelope, pulse number phase in the unit time
Together.After the voltage magnitude for obtaining the induced potential, in the frequency of the alternating current magnetic field, pulse envelope, in the unit time
Pulse number and pulsewidth on the basis of be obtained with the complete information of the induced potential.
When the frequency of the alternating voltage and the frequency difference of the alternating magnetic field, the induced potential calculates dress
It sets 160 and the impedance of the output end 126 and voltage offer device application under the frequency according to the induced potential is provided
Alternating voltage frequency under the output end 126 impedance ratio calculation curve amendment coefficient, and according to the curve
Correction factor corrects the temperature voltage corresponding relationship.That is, when the alternating voltage applied to the Medical Instruments 120 and
The frequency phase of the alternating magnetic field corresponds to meanwhile, it is capable to directly calculate the first temperature increment according to temperature voltage corresponding relationship curve
Voltage magnitude.
When the frequency difference of the alternating voltage and the alternating magnetic field that apply to the Medical Instruments 120, basis is needed
The impedance of the output end 126 is corrected the temperature voltage curve under different frequency.Specifically, the Medical Instruments
120 in the alternating magnetic field when, the impedance of the output end 126 is R1.Apply alternating voltage to the Medical Instruments 120
Frequency under, the impedance of the output end 126 is R2.The curve amendment coefficient isTherefore, the temperature voltage pair
Should be related to should be multiplied byTo correct temperature voltage corresponding relationship corresponding relationship caused by impedance variations under different frequency
Variation.The alternating current magnetic field frequency, pulse envelope, the pulse number in the unit time and pulsewidth can pass through MRI scan
The MRI scan sequence of instrument directly obtains, and can also be obtained by the way of measuring original induced potential.Fig. 6 is referred to,
For the envelope of 90 ° of radio-frequency pulses of Philip Achieva 3T magnetic resonance bold sequence, actual radiofrequency field is 128MHz variation
Alternating magnetic field.The alternating magnetic field inducts to obtain induced potential also form having the same in the Medical Instruments 120, only
Amplitude unlike one.
In one embodiment, the induced potential measuring system 10 can further include voltage measuring apparatus 140,
For obtaining frequency, the pulse envelope, the arteries and veins in the unit time of the alternating magnetic field by the way of measuring original induced potential
Rush number and pulsewidth.Due to the frequency of the original induced potential, pulse envelope, pulse number and the alternation in the unit time
The frequency in magnetic field, pulse envelope, the pulse number between unit are identical, can be by using the mode for measuring original induced potential
Obtain the pulse envelope of the alternating magnetic field, pulse number and pulsewidth in the unit time.
Please also refer to Fig. 7, the voltage measuring apparatus 140 may include oscillograph 142 and with the oscillograph 142
The coaxial cable 144 of connection.The oscillograph 142 is placed on outside the scanning room of the nuclear magnetic resonane scanne, by described same
Shaft cable 144 is connect with the shell of the output end 126 of the Medical Instruments 120 and pulse signal generator 122.When the nuclear-magnetism
When the scanning function of resonance scanner is opened, the Medical Instruments 120 is in alternating magnetic field, can pass through the oscillography at this time
Device 142 directly acquires the original induced potential that the Medical Instruments 120 generates in alternating magnetic field.Due to the coaxial cable
144 are partially in scanning room, therefore in scanning, the coaxial cable 144 can also generate induced potential.
The original induced potential is exactly the induced potential that the Medical Instruments 120 is generated with the coaxial cable 144
With.Frequency, pulse envelope, the pulse number in the unit time and the pulsewidth of the original induced potential at this time and the alternation
The frequency in magnetic field, pulse envelope, the pulse number in the unit time and pulsewidth are identical.Therefore, the induced potential can be passed through
Measuring system 10 gets frequency, pulse envelope, pulse number and the pulsewidth in the unit time of the alternating magnetic field.In this base
It, can be by the voltage application device 150 to the pulse packet of the Medical Instruments 120 input and the alternating magnetic field on plinth
Network, pulse number and the identical alternating voltage of pulsewidth obtain the voltage temperature curve in the unit time.It is appreciated that institute
Stating voltage measuring apparatus 140 is a kind of optional technical solution.When the MRI scan of nuclear magnetic resonane scanne can be passed through
Sequence directly obtains the pulse envelope of alternating magnetic field, in the unit time pulse number and when pulsewidth without voltage survey
Measure device 140.
Induced potential measuring system 10 provided by the present application can be used for measuring Medical Instruments 120 and produce in alternating magnetic field
Raw induced potential.The induced potential measuring system 10 provides device 150 by voltage and applies alternation electricity to Medical Instruments 120
Pressure.The temperature measuring device 130 can measure the corresponding second temperature increment of the different amplitude of the alternating voltage.To,
The induced potential computing device 160 obtains the corresponding relationship of the second temperature increment and voltage magnitude.The temperature
Measuring device 130 can also measure first temperature increment of the Medical Instruments 120 in alternating magnetic field.The induced potential meter
Calculate the amplitude that device 160 obtains the induced potential by first temperature increment and the temperature voltage corresponding relationship.By
In the frequency of the induced potential, pulse envelope, pulse number and pulsewidth and the frequency of the alternating magnetic field in the unit time,
Pulse number and pulsewidth between pulse envelope, unit is identical, it is hereby achieved that all information of the induced potential.Cause
This, induced potential of the Medical Instruments 120 that induced potential measuring system 10 provided by the present application measures in alternating magnetic field is whole
It is the induced potential for being generated by Medical Instruments 120 itself, and not including the generation of measurement cable, accuracy is higher.
Please also refer to Fig. 8, the embodiment of the present application further provides for a kind of measurement method of induced potential, for measuring doctor
The induced potential that instrument 120 generates in alternating magnetic field is treated, the Medical Instruments 120 includes impulse generator 122 and the arteries and veins
The output end 126 for rushing the conductor part 124 of the connection of generator 122 and being connect with the conductor part 124, the measurement side
Method the following steps are included:
S110 applies alternating magnetic field to the Medical Instruments 120, obtains the first temperature increment of the output end 126, institute
Stating the first temperature increment is temperature and the medical instrument when output end 126 reaches stable state in the alternating magnetic field
The difference of room temperature temperature when device 120 is not in the alternating magnetic field.
The Medical Instruments 120 can be set in body mould 110, and the Medical Instruments 120 is closed with the body mould 110 composition
Close circuit.Specifically, the alternating magnetic field can be provided by nuclear magnetic resonane scanne.The body mould 110 is placed on the core
In the scanning room of magnetic resonance scanner, when the nuclear magnetic resonane scanne opens scanning function, the Medical Instruments 120 will be located
In the magnetic field of alternation.For the body mould 110 in the scanning room, the alternating current magnetic field applies the medical treatment after a certain period of time
The temperature of the output end 126 of instrument 120 can reach a stationary value.The stationary value of the temperature and the output end 126 be not
The difference of room temperature temperature when generation induced potential is exactly first temperature increment.The temperature measuring device can be passed through
130 measure first temperature increment.Specifically, the output end 126 can be measured by the method for optical fiber temperature-measurement
Temperature.Since optical fiber not will receive the influence of alternating magnetic field, so that the temperature of the output end 126 of measurement is more accurate.
S120 closes the alternating magnetic field for being applied to the Medical Instruments 120, applies alternation electricity to the Medical Instruments 120
It presses so that the heating of the output end 126, the pulse envelope of the alternating voltage, the pulse number in the unit time and pulsewidth and institute
It is identical to state alternating magnetic field.
Due to the pulse envelope of the induced potential, the pulse number in the unit time and pulsewidth and the alternating magnetic field phase
Together.The pulse with alternating magnetic field pulse envelope having the same, in the unit time to the Medical Instruments 120 application can be passed through
Several and pulsewidth alternating voltage is so that the output end 126 heats up, to simulate the induced potential in the output end
The heating of 126 brings.Frequency, pulse envelope, the pulse number in the unit time and the pulsewidth of the alternating magnetic field can lead to
The MRI scan sequence for crossing nuclear magnetic resonane scanne directly obtains, and can also be obtained by the way of measuring original induced potential
?.Specifically, the alternating voltage can provide device 150 by the voltage and be applied in the Medical Instruments 120.
S130 obtains multiple second temperatures of the corresponding output end 126 of different voltages amplitude of the alternating voltage
Increment.
The different voltage magnitude of the alternating voltage can make the output end 126 have different heatings.It therefore, can be with
By inputting the alternating voltage of different voltages amplitude to the Medical Instruments 120, so that the output end 126 has different liters
Temperature value, that is, multiple second temperature increments.Then it can recorde the corresponding second temperature increment of each voltage magnitude.The step
It can be executed by the induced potential computing device 160.
S140 obtains the second temperature increment according to the multiple second temperature increment and the different voltages amplitude
With the temperature voltage corresponding relationship of the voltage magnitude, and first temperature is calculated according to the temperature voltage corresponding relationship and is increased
Measure corresponding voltage magnitude.
After obtaining the multiple second temperature increment and each corresponding voltage magnitude of second temperature increment,
The temperature voltage corresponding relationship between the second temperature increment and voltage magnitude can be simulated.Fig. 9 is referred to, Fig. 9 is
Second temperature increment and induced potential magnitude relation curve graph.The temperature voltage of the second temperature increment and the voltage magnitude
In corresponding relationship, the second temperature increment and the voltage magnitude are quadratic function relation.In the corresponding pass of the temperature voltage
On the basis of system, the corresponding voltage magnitude of the induced potential can be obtained by first temperature increment.Due to the sense
Frequency, envelope and the pulsewidth of raw voltage are identical as the frequency of the nuclear magnetic resonane scanne, envelope and pulsewidth.Therefore, exist
After the voltage magnitude for obtaining the induced potential, so that it may according to the frequency pulse envelope of the nuclear magnetic resonane scanne,
Pulse number and pulsewidth obtain all information of the induced potential in unit time.Specifically, which can be by described
Induced potential computing device 160 executes.
In one embodiment, the step S140 can with the following steps are included:
S142 obtains the second temperature increment according to the multiple second temperature increment and the different voltages amplitude
With the temperature voltage corresponding relationship of the voltage magnitude；
S144, when the frequency of the alternating voltage and the frequency difference of the alternating magnetic field, according to the induced potential
Frequency under the output end 126 impedance and the voltage provide device apply alternating voltage frequency under the output end
The ratio calculation curve amendment coefficient of 126 impedance, and the temperature voltage is corrected according to the curve amendment coefficient and is corresponded to
Relationship；
S146 calculates the corresponding voltage magnitude of first temperature increment according to the temperature voltage corresponding relationship.
In the S144, when the frequency of the alternating voltage and the frequency difference of the alternating magnetic field, the sense
Raw voltage computing device 160 is also used to the impedance of the output end 126 and the voltage under the frequency according to the induced potential
The ratio calculation curve amendment coefficient of the impedance of the output end 126 under the frequency for the alternating voltage that device applies is provided.Also
It is to say, when the frequency phase of the alternating voltage and the alternating magnetic field of giving the Medical Instruments 120 to apply is meanwhile, it is capable to direct basis
Temperature voltage corresponding relationship curve calculates the corresponding voltage magnitude of the first temperature increment.When what is applied to the Medical Instruments 120
When the frequency difference of alternating voltage and the alternating magnetic field, the impedance ground according to output end 126 described under different frequency is needed
The temperature voltage curve is corrected.Specifically, when the Medical Instruments 120 is in the alternating magnetic field, the output
The impedance at end 126 is R1.Under the frequency for applying alternating voltage to the Medical Instruments 120, the impedance of the output end 126 is
R2.The curve amendment coefficient isTherefore, in the S146, the temperature voltage corresponding relationship should be multiplied byTo correct the variation of temperature voltage corresponding relationship corresponding relationship caused by impedance variations under different frequency.It is appreciated that
When the frequency of the alternating magnetic field, the pulse number in the pulse envelope unit time and pulsewidth can not directly acquire, the sense
The measurement method of raw voltage can further include the frequency for obtaining the alternating magnetic field, the arteries and veins in the pulse envelope unit time
The step of rushing number and pulsewidth, comprising:
S210 obtains the Medical Instruments 120 and the coaxial cable 144 connecting with the Medical Instruments 120 described
The original induced potential generated in alternating magnetic field；
S220 obtains the frequency of the alternating magnetic field, in the pulse envelope unit time by the original induced potential
Pulse number and pulsewidth, frequency, the pulse number in the pulse envelope unit time and the pulsewidth of the original induced potential and institute
Frequency, the pulse number in the pulse envelope unit time and the pulsewidth for stating alternating magnetic field are equal.
The original induced potential includes the induced potential and the coaxial cable 144 that the Medical Instruments 120 generates
The induced potential of generation.The original induced potential can be measured by the voltage measuring apparatus 140.Due to the original sense
Frequency, the pulse number in the pulse envelope unit time and the pulsewidth of raw voltage and frequency, the pulse envelope of the alternating magnetic field
Pulse number and pulsewidth in unit time is equal, can obtain the alternating magnetic field by measuring the original induced potential
Frequency, the pulse number in the pulse envelope unit time and pulsewidth.
The measurement method of induced potential provided by the embodiments of the present application, for obtaining Medical Instruments 120 in alternating magnetic field
The induced potential of generation.By obtaining the temperature voltage relationship of the Medical Instruments 120, the Medical Instruments is obtained to calculate
The induced potential that 120 output end 126 generates in alternating magnetic field is surveyed so as to avoid using voltage measuring apparatus by cable
Measure induced potential bring error, accuracy with higher.
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.
Claims (10)
1. a kind of induced potential measuring system, the induced potential generated in alternating magnetic field for measuring Medical Instruments, the doctor
Treating instrument includes conductor part, and the output end connecting with the conductor part characterized by comprising
Temperature measuring device, when being in alternating magnetic field to measure the Medical Instruments, the first temperature of the output end increases
When amount and the Medical Instruments are not in alternating magnetic field, the second temperature increment of the output end；
Voltage provides device, to apply alternation to the Medical Instruments when the Medical Instruments is not in alternating magnetic field
Voltage is so that output end heating reaches the second temperature increment, the pulse envelope of the alternating voltage, in the unit time
Pulse number and pulsewidth are identical as the pulse envelope of the alternating magnetic field, the pulse number in the unit time and pulsewidth；
The induced potential computing device that device is connect is provided with the temperature measuring device and the voltage, to according to multiple institutes
The voltage magnitude for stating second temperature increment alternating voltage corresponding with the multiple second temperature increment obtains voltage magnitude and temperature
The temperature voltage corresponding relationship of increment is spent, and first temperature increment is calculated according to the temperature voltage corresponding relationship and is corresponded to
Voltage magnitude.
2. induced potential measuring system as described in claim 1, which is characterized in that the temperature measuring device includes that optical fiber is surveyed
Warm device and the temperature indicator connecting with the optical fiber temperature-measurement device, the optical fiber temperature-measurement device described in optical fiber measurement by exporting
The temperature at end, the temperature indicator are used to show the measurement result of the optical fiber temperature-measurement device.
3. induced potential measuring system as described in claim 1, which is characterized in that it includes signal hair that the voltage, which provides device,
Raw device, the power amplifier connecting with the signal generator, the power amplifier are applied by conducting wire to the Medical Instruments
Add the alternating voltage.
4. induced potential measuring system as described in claim 1, which is characterized in that it further comprise voltage measuring apparatus, it is described
Voltage measuring apparatus is for measuring the Medical Instruments and the coaxial cable being connected with the Medical Instruments in the alternation magnetic
The original induced potential that generates in, the frequency of the original induced potential, pulse envelope, in the unit time pulse number and
Pulse number and pulsewidth between pulsewidth and the frequency of the alternating magnetic field, pulse envelope, unit is identical.
5. induced potential measuring system as described in claim 1, which is characterized in that the frequency of the alternating voltage and the friendship
When the frequency difference of varying magnetic field, the induced potential computing device is also used to the output under the frequency according to the induced potential
The ratio calculation of the impedance of the output end is bent under the frequency for the alternating voltage that the impedance at end and voltage offer device apply
Line correction factor, and the temperature voltage corresponding relationship is corrected according to the curve amendment coefficient.
6. a kind of measurement method of induced potential, the induced potential generated in alternating magnetic field for measuring Medical Instruments is described
Medical Instruments includes conductor part and the output end that connect with the conductor part, the measurement method the following steps are included:
Apply alternating magnetic field to the Medical Instruments, obtains the first temperature increment of the output end, first temperature increment
Temperature and the Medical Instruments when reaching stable state in the alternating magnetic field for the output end are not in the alternation
The difference of temperature when in magnetic field；
The alternating magnetic field for being applied to the Medical Instruments is closed, applies alternating voltage so that the output end to the Medical Instruments
Heating, the pulse envelope of the alternating voltage, the pulse number in the unit time and pulsewidth are identical as the alternating magnetic field；
Obtain multiple second temperature increments of the corresponding output end of different voltages amplitude of the alternating voltage；
The second temperature increment and the electricity are obtained according to the multiple second temperature increment and the different voltages amplitude
The temperature voltage corresponding relationship of pressure amplitude value, and it is corresponding according to temperature voltage corresponding relationship calculating first temperature increment
Voltage magnitude.
7. method as claimed in claim 6, which is characterized in that further comprise the frequency for obtaining the alternating magnetic field, pulse
Envelope, pulse number and the step of pulsewidth in the unit time, comprising:
Obtain the Medical Instruments and original that the coaxial cable connecting with the Medical Instruments generates in the alternating magnetic field
Beginning induced potential；
Frequency, envelope and the pulsewidth of the alternating magnetic field are obtained by the original induced potential, the original induced potential
Frequency, pulse envelope, frequency, pulse envelope, the unit of pulse number and pulsewidth and the alternating magnetic field in the unit time
Pulse number and pulsewidth are equal in time.
8. method as claimed in claim 6, which is characterized in that the Medical Instruments is set in body mould, the Medical Instruments
Closed circuit is constituted with the body mould.
9. method according to claim 8, which is characterized in that the temperature of the second temperature increment and voltage magnitude electricity
It presses in corresponding relationship, the second temperature increment and the voltage magnitude are quadratic function relation.
10. method as claimed in claim 9, which is characterized in that described according to the multiple second temperature increment and described
Different voltages amplitude obtains the temperature voltage corresponding relationship of the second temperature increment Yu the voltage magnitude, and according to the temperature
Degree voltage corresponding relationship calculates the corresponding voltage magnitude of first temperature increment
The second temperature increment and the electricity are obtained according to the multiple second temperature increment and the different voltages amplitude
The temperature voltage corresponding relationship of pressure amplitude value；
When the frequency of the alternating voltage and the frequency difference of the alternating magnetic field, according to institute under the frequency of the induced potential
The ratio of the impedance of the output end under the frequency for the alternating voltage that the impedance and voltage offer device for stating output end apply
Calculated curve correction factor, and the temperature voltage corresponding relationship is corrected according to the curve amendment coefficient；
The corresponding voltage magnitude of first temperature increment is calculated according to the temperature voltage corresponding relationship.
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| EP0458466A2 (en) * | 1990-05-21 | 1991-11-27 | Sumitomo Electric Industries, Limited | Hall device |
| CN103412009A (en) * | 2013-08-21 | 2013-11-27 | 中国海洋石油总公司 | Fluid conductivity sensor, and device and method for measuring fluid conductivity |
| CN107301947A (en) * | 2016-03-31 | 2017-10-27 | 比亚迪股份有限公司 | Power semiconductor with temperature detection and preparation method thereof |
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| JP4406585B2 (en) * | 2004-07-27 | 2010-01-27 | 三井造船株式会社 | Induction voltage detection method and apparatus, and induction heating system |
| CN101750161A (en) * | 2008-12-08 | 2010-06-23 | 黑龙江乾丰科技发展有限公司 | Method for measuring temperature of conductor in strong alternating electromagnetic field |
| JP4760926B2 (en) * | 2009-02-05 | 2011-08-31 | 株式会社デンソー | Indicators for vehicles |
| CN102374896B (en) * | 2011-09-19 | 2013-01-16 | 基康仪器(北京)有限公司 | Method and device for measuring equal precision frequency of single coil vibrating wire instrument |
| JP5813727B2 (en) * | 2013-11-01 | 2015-11-17 | コスモヘルス株式会社 | Potential therapy device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0458466A2 (en) * | 1990-05-21 | 1991-11-27 | Sumitomo Electric Industries, Limited | Hall device |
| CN103412009A (en) * | 2013-08-21 | 2013-11-27 | 中国海洋石油总公司 | Fluid conductivity sensor, and device and method for measuring fluid conductivity |
| CN107301947A (en) * | 2016-03-31 | 2017-10-27 | 比亚迪股份有限公司 | Power semiconductor with temperature detection and preparation method thereof |
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