CN107045114A - Radio-frequency transmissions level sensor, control panel and the system of magnetic resonance imaging system - Google Patents
Radio-frequency transmissions level sensor, control panel and the system of magnetic resonance imaging system Download PDFInfo
- Publication number
- CN107045114A CN107045114A CN201610100092.XA CN201610100092A CN107045114A CN 107045114 A CN107045114 A CN 107045114A CN 201610100092 A CN201610100092 A CN 201610100092A CN 107045114 A CN107045114 A CN 107045114A
- Authority
- CN
- China
- Prior art keywords
- signal
- radio
- frequency
- analog
- frequency signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
- G01R33/543—Control of the operation of the MR system, e.g. setting of acquisition parameters prior to or during MR data acquisition, dynamic shimming, use of one or more scout images for scan plane prescription
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- High Energy & Nuclear Physics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Embodiment of the present invention discloses radio-frequency transmissions level sensor, control panel and the system of a kind of magnetic resonance imaging system.Radio-frequency transmissions level sensor includes：Analog-digital converter, for the analog signal changed by analog radio-frequency signal or based on the analog radio-frequency signal, is converted to data signal；Control module, the specific absorption rate value for calculating the analog radio-frequency signal based on the data signal, when specific absorption rate value exceedes threshold value, generates alarm signal.The present invention can reduce the resource requirement to the control unit of magnetic resonance imaging system, can be with cost-effective and prevent noise.
Description
Technical field
The present invention relates to medical device technical field, the radio-frequency transmissions level sensor of more particularly to a kind of magnetic resonance imaging system,
Control panel and system.
Background technology
Magnetic resonance imaging (Magnetic Resonance Imaging, MRI) is with computer technology, electronic circuit technology, surpassed
The development of conductor technology and a kind of biomagnetism nuclear spin imaging technique developed rapidly.It is made using magnetic field with radio-frequency pulse
The proton (i.e. H+) of precession in tissue occurs vibration and produces radiofrequency signal, handles and is imaged through computer.Put when object
Put in magnetic field, with appropriate electromagnetic wave irradiation it, be allowed to resonate, then analyze it discharge electromagnetic wave, it is possible to learn structure
Into the nuclear position of this object and species, the accurate stereo-picture of interior of articles can be depicted as accordingly.Such as, can be with
The animation of the serial section obtained by MRI scan human brain.
Considered based on patient safety, it is necessary to calculate the specific absorption rate (Specific Absorption Ratio, SAR) of radiofrequency signal
Value, the electromagnetic radiation to ensure radiofrequency signal meets corresponding safety specification.
In the prior art, radio-frequency transmissions level sensor (Transmit Level Sensor, TLS) detection analog radio frequency letter is utilized
Number.Analog radio-frequency signal is sent to the control unit of magnetic resonance imaging system by TLS.Control unit changes analog radio-frequency signal
For digital radio signal, and SAR value is calculated, radio-frequency power amplifier is closed when SAR value is exceeded.
However, performing analog-to-digital conversion by control unit and calculating SAR value, the resource requirement to control unit is improved.Moreover,
Analog radio-frequency signal is transmitted between TLS and control unit, high demand also is proposed to transmission bandwidth and noiseproof feature.
The content of the invention
Embodiment of the present invention proposes a kind of radio-frequency transmissions level sensor, control panel and the system of magnetic resonance imaging system, so that
Reduce the resource requirement to the control unit of magnetic resonance imaging system.
The technical scheme of embodiment of the present invention is as follows：
According to the one side of embodiment of the present invention, a kind of radio-frequency transmissions level sensor of magnetic resonance imaging system, including：
One analog-digital converter, for the analog signal changed by an analog radio-frequency signal or based on analog radio-frequency signal, is converted to one
Data signal；
One control module, the specific absorption rate value for calculating the analog radio-frequency signal based on the data signal, when the ratio
When absorptance values are more than a threshold value, an alarm signal is generated.
In one embodiment, the control module includes：
One or more field programmable gate arrays；Or
One field programmable gate array, one or more integrated processor cores of the field programmable gate array；Or
One or more processors and one or more field programmable gate arrays；Or
One or more processors and one or more coprocessor arrays；Or
One or more processors.
In one embodiment, in addition to：
One directional coupler, is arranged in the front end of the analog-digital converter, for receiving the analog radio-frequency signal or based on described
The analog signal of analog radio-frequency signal conversion, and the simulation changed to the analog radio-frequency signal or based on the analog radio-frequency signal
Signal performs power distribution processing.
In one embodiment, in addition to：
One rf detector, is arranged between the directional coupler and the analog-digital converter, for detecting the analog radio frequency
Signal or the analog signal changed based on the analog radio-frequency signal, and to the analog radio-frequency signal or based on the analog radio frequency
The analog signal of signal conversion performs a down-converted.
In one embodiment, the rf detector includes：
One envelope detector and a low pass filter；Or
One bandpass filter, a frequency mixer and a low pass filter.
In one embodiment, in addition to：
One shaping frequency complementary modulus block, is arranged between the directional coupler and the rf detector, for the analog radio frequency
Signal or the analog signal changed based on the analog radio-frequency signal perform a Shape correction and frequency compensation processing.
In one embodiment, in addition to：
One controlling cable interface, for sending the alarm signal；And/or
One controller LAN interface, a first message of the specific absorption rate value is included for sending, and/or, receive and include one
One second message of specific absorption rate calculating parameter and/or the threshold value；And/or
One serial ports, for sending the alarm signal and/or the first message, and/or, receive second message.
According to the another aspect of embodiment of the present invention, a kind of control panel of magnetic resonance imaging system, including：
One substrate；
The analog-digital converter of arrangement on the substrate, for by the analog radio-frequency signal or based on the analog radio-frequency signal
The analog signal of conversion is converted to a data signal；
The control module of arrangement on the substrate, the ratio for calculating the analog radio-frequency signal based on the data signal
Absorptance values, when the specific absorption rate value is more than a threshold value, generate an alarm signal.
In one embodiment, in addition to：
The controlling cable interface of arrangement on the substrate, for sending the alarm signal；And/or
The controller LAN interface of arrangement on the substrate, a first message of the specific absorption rate value is included for sending,
And/or, receive one second message comprising a specific absorption rate calculating parameter and/or the threshold value；And/or
The serial ports of arrangement on the substrate, for sending the alarm signal and/or the first message, and/or, receive institute
State the second message.
According to the another aspect of embodiment of the present invention, a kind of control system of magnetic resonance imaging system, including：
One radio-frequency power amplifier, for amplifying and exporting an analog radio-frequency signal；
One radio-frequency transmissions level sensor, for detecting the analog radio-frequency signal, a number is converted to by the analog radio-frequency signal
Word radiofrequency signal, calculates a specific absorption rate value of the digital radio signal, when the specific absorption rate value exceedes set in advance one
During threshold value, an alarm signal is sent；
One control unit, for closing the radio-frequency power amplifier based on the alarm signal.
It can be seen from the above technical proposal that different from the prior art by the control unit of magnetic resonance imaging system by analog radio frequency
Signal is converted to digital radio signal and calculates specific absorption rate value, in embodiments of the present invention, and radio-frequency transmissions level sensor will
Analog radio-frequency signal is converted to data signal based on the analog signal that analog radio-frequency signal is changed, and calculating simulation radiofrequency signal
Specific absorption rate value, so as to reduce the resource requirement to the control unit of magnetic resonance imaging system.
Moreover, in embodiments of the present invention, radio-frequency transmissions level sensor to the control unit of magnetic resonance imaging system without sending out
Analog radio-frequency signal is sent, so as to reduce transmission bandwidth demand, it is to avoid the noise during analog signal transmission, and improved
The accuracy in computation of specific absorption rate value.
Not only in this, in embodiments of the present invention, function and ratio can be detected by integrated RF in radio-frequency transmissions level sensor
Absorptance values calculation function, the processor core of such as central processing unit core or microprocessor core etc can also be integrated into scene can
Program in gate array, so as to also improve level of integrated system, and reduce cost.
Brief description of the drawings
Fig. 1 is the structure chart of the radio-frequency transmissions level sensor of the magnetic resonance imaging system according to embodiment of the present invention.
Fig. 2 is the demonstrative structure figure of the radio-frequency transmissions level sensor of the magnetic resonance imaging system according to embodiment of the present invention.
Fig. 3 is the demonstrative structure figure of the narrow radio frequency detector according to embodiment of the present invention.
Fig. 4 is the demonstrative structure figure of the wide band radio-frequency detector according to embodiment of the present invention.
Fig. 5 is the first example use of the radio-frequency transmissions level sensor of the magnetic resonance imaging system according to embodiment of the present invention
Structure chart.
Fig. 6 is the second example use of the radio-frequency transmissions level sensor of the magnetic resonance imaging system according to embodiment of the present invention
Structure chart.
Fig. 7 is the 3rd example use of the radio-frequency transmissions level sensor of the magnetic resonance imaging system according to embodiment of the present invention
Structure chart.
Fig. 8 is the circuit layout of the control panel of the magnetic resonance imaging system according to embodiment of the present invention.
Fig. 9 is the structure chart of the control system of the magnetic resonance imaging system according to embodiment of the present invention.
Embodiment
In order that technical scheme and advantage are more clearly understood, below in conjunction with drawings and the embodiments, the present invention is entered
Row is further described.It should be appreciated that embodiment described herein is only to the illustrative explanation present invention, and
It is not intended to limit the scope of the invention.
In order to succinct and directly perceived on describing, hereafter the solution of the present invention is carried out by describing some representational embodiments
Illustrate.Substantial amounts of details is only used for help and understands the solution of the present invention in embodiment.However, it will be apparent that the technical side of the present invention
Case can be not limited to these details when realizing.In order to avoid unnecessarily having obscured the solution of the present invention, some embodiments do not have
Have and meticulously described, but only give framework.Hereinafter, " comprising " refers to " include but is not limited to ", " according to ... "
Refer to " according at least to ..., but be not limited to according only to ... ".Due to the speech habits of Chinese, one is hereinafter not specifically stated
During the quantity of individual composition, it is meant that it can also be multiple that the composition, which can be one, or can be regarded as at least one.
Generally, the radiofrequency launcher of magnetic resonance imaging system sends analog radio-frequency signal.The analog radio-frequency signal is put by radio-frequency power
After big device amplification, radio-frequency transmissions level sensor is immediately sent to, or be converted to other types (such as：Intermediate frequency, low frequency or
Direct current) analog signal after be sent to radio-frequency transmissions level sensor.
Fig. 1 is the structure chart of the radio-frequency transmissions level sensor of the magnetic resonance imaging system according to embodiment of the present invention.
As shown in figure 1, the radio-frequency transmissions level sensor 10 includes：
Analog-digital converter 14, for the analog signal changed by analog radio-frequency signal or based on the analog radio-frequency signal, is converted to number
Word signal；
Control module 15, the SAR value for calculating the analog radio-frequency signal based on the data signal, when SAR value exceedes thresholding
During value, alarm signal is generated.
Wherein, analog radio-frequency signal is the radiofrequency signal of analog format.Radiofrequency signal can be forward direction radiofrequency signal, can also be
Reflected radio-frequency signal.The analog signal changed based on analog radio-frequency signal can include：Analog radio-frequency signal is performed at down coversion
Manage the low-frequency analog signal or analog intermediate frequency signal changed out；The DC simulation signal changed out based on analog radio-frequency signal, etc.
Deng.
Analog-digital converter 14 may be embodied as analog-to-digital conversion (Analog-to-Digital Converting, ADC) core of various models
Piece.Analog-digital converter 14 can also be embodied as the analog-digital conversion function mould being integrated in microprocessor or field programmable gate array
Block.
In one embodiment, control module 15 can be based on the ginseng of default manikin (such as whole body, part or four limbs)
Number, by one or more predetermined SAR algorithms, the SAR value of analog radio-frequency signal is calculated based on data signal.SAR value
Radiation effect of the representative simulation radiofrequency signal to human body.Under normal circumstances, SAR value is lower, the absorbed spoke of analog radio-frequency signal
The amount of penetrating is fewer.SAR algorithms have a variety of ripe embodiments, and the present invention is repeated no more to this.
It can be seen that, in embodiments of the present invention, radio-frequency transmissions level sensor to the control unit of magnetic resonance imaging system without sending out
Analog radio-frequency signal is sent, but voluntarily calculates SAR value, so as to reduce transmission bandwidth demand, it is to avoid analog signal transmission mistake
Noise in journey, and improve the accuracy in computation of SAR value.
When the SAR value that control module 15 is calculated exceedes threshold value, the generation alarm signal of control module 15.
Alarm signal can be used for directly pointing out user's SAR value exceeded.Such as, control module 15 can be touched using alarm signal
Hair is in the prompting equipment for sending the prompt messages such as sound, light.Alarm signal can be also used for the radio frequency for magnetic resonance imaging system
The control operation of power amplifier.
In one embodiment, radio-frequency transmissions level sensor 10 also includes controlling cable interface.Control module 15 is via control
Cable interface processed sends alarm signal to radio-frequency power amplifier, and radio-frequency power amplifier is received and is closed after alarm signal.At this
Plant in embodiment, radio-frequency transmissions level sensor 10 directly controls radio-frequency power amplifier based on the alarm signal that itself is generated.
In one embodiment, control module 15 sends report via controlling cable interface to the control unit of magnetic resonance imaging system
Alert signal, so that being based on alarm signal by the control unit of magnetic resonance imaging system closes radio-frequency power amplifier.Implement this
In mode, the control unit of magnetic resonance imaging system controls radio frequency based on the alarm signal that radio-frequency transmissions level sensor 10 is provided
Power amplifier.
Specifically, controlling cable may be embodied as optical fiber cable or electric wire cable, etc..
In one embodiment, radio-frequency transmissions level sensor 10 also includes controller LAN (Controller Area
Network, CAN) interface.Control module 15 sends to the control unit of magnetic resonance imaging system via CAN interface and included
The first message of SAR value, and/or, receive and calculated comprising SAR from the control unit of magnetic resonance imaging system via CAN interface
Second message of parameter and/or the threshold value.
The difference of the SAR algorithms used corresponding to control module 15, SAR calculating parameters may have difference.Such as, SAR
Calculating parameter can include：Whole Body model parameter, body local model parameter or four limbs model parameter, etc..
Control module 15 utilizes SAR calculating parameters, is calculated using SAR algorithms after SAR value, can will include SAR value
First message be sent to the control unit of magnetic resonance imaging system.The control unit of magnetic resonance imaging system is solved from first message
SAR value is separated out, and records SAR value.Control of the control module 15 without first message to be transferred to magnetic resonance imaging system in real time
Unit processed.Therefore the transmission speed of CAN interface can be suitably reduced, so as to reduce cost.
In one embodiment, radio-frequency transmissions level sensor 10 includes serial ports.Control module 15 is via serial ports to magnetic resonance
The control unit of imaging system sends alarm signal, is penetrated so as to be based on alarm signal by the control unit of magnetic resonance imaging system and close
Frequency power amplifier.Control module 15 can also be sent comprising SAR value via serial ports to the control unit of magnetic resonance imaging system
First message, and/or, received via serial ports from the control unit of magnetic resonance imaging system comprising SAR calculating parameters and/or should
Second message of threshold value.
The exemplary interface type described between control module 15 and the control unit of magnetic resonance imaging system of the above, this area skill
Art personnel are it is to be appreciated that the description of these interface types is only protection domain that is exemplary, being not intended to limit the present invention.
In one embodiment, control module 15 includes：Field programmable gate array (Field-Programmable Gate
Array, FPGA), one or more integrated processor cores of the field programmable gate array.Specifically, processor core can include：
Central processing unit (Central Processing Unit, CPU) core；Microprocessor (Microcontroller Unit, MCU) core；
Etc..
In one embodiment, control module 15 includes：One or more field programmable gate arrays, and field programmable gate
Not integrated processor core in array.
In one embodiment, control module 15 includes：One or more processors and one or more field programmable gate arrays.
Specifically, processor includes：Central processing unit；Microprocessor；Etc..
In one embodiment, control module 15 includes：One or more processors and one or more coprocessor arrays
(Coprocessor-Array).Similar, processor includes：Central processing unit；Microprocessor；Etc..
In one embodiment, control module 15 includes：One or more processors.
In one embodiment, directional coupler is arranged outside radio-frequency transmissions level sensor 10, or by directional coupler collection
Into into radio-frequency transmissions level sensor 10.Directional coupler receives analog radio-frequency signal or based on simulation from radio-frequency power amplifier
The analog signal of radiofrequency signal conversion, the analog signal changed to analog radio-frequency signal or based on analog radio-frequency signal performs power point
With processing.Specifically, the simulation that directional coupler is changed by the analog radio-frequency signal of most of power or based on analog radio-frequency signal
Signal is sent to transmitting coil (such as body coil or local coil), and by the analog radio-frequency signal of remaining fraction power or based on mould
The analog signal for intending radiofrequency signal conversion is sent to analog-digital converter 14.
In one embodiment, analog-digital converter 14 directly receives analog radio-frequency signal or based on analog radio frequency from directional coupler
The analog signal of signal conversion, and be converted to digital letter by analog radio-frequency signal or based on the analog signal that analog radio-frequency signal is changed
Number.The simulation letter for directly receiving analog radio-frequency signal when analog-digital converter 14 from directional coupler or being changed based on analog radio-frequency signal
Number when, analog radio-frequency signal that analog-digital converter 14 is received or the analog signal changed based on analog radio-frequency signal generally have compared with
High-frequency, it is therefore desirable to which analog-digital converter 14 has higher digit and sample rate.
In one embodiment, analog-digital converter 14 is not directly received analog radio-frequency signal from directional coupler or penetrated based on simulation
Frequency signal conversion analog signal, but 14 between directional coupler and analog-digital converter between arrange rf detector.Radio frequency
The analog signal that detector is received analog radio-frequency signal from directional coupler or changed based on analog radio-frequency signal, believes analog radio frequency
Number or the analog signal changed based on analog radio-frequency signal perform down-converted, and by the analog radio-frequency signal after down-converted,
Or after down-converted, based on analog radio-frequency signal change analog signal be sent to analog-digital converter 14.Analog-digital converter 14
Again by the analog radio-frequency signal after down-converted, or after down-converted, based on analog radio-frequency signal change analog signal,
Be converted to data signal.In this embodiment, it is sent to the analog radio-frequency signal of analog-digital converter 14 or based on analog radio frequency
The analog signal of signal conversion passes through down-converted, with lower frequency, therefore can reduce the position to analog-digital converter 14
The demand of number and sample rate.
Rf detector can be specifically embodied as receiving the wide band radio-frequency detector of analog radio-frequency signal using broadband reception mode,
It can be specifically embodied as receiving the narrow radio frequency detector of analog radio-frequency signal using narrow-band reception mode.Such as, wide band radio-frequency is examined
Surveying device includes：Envelope detector and low pass filter, wherein envelope detector may be embodied as：Logafier or diode.
Narrow radio frequency detector includes：Bandpass filter, frequency mixer and low pass filter.
Citing describes the concrete structure of rf detector above, it will be appreciated by those of skill in the art that this description is only shown
Plasticity, it is not used to constitute restriction to protection scope of the present invention.
In one embodiment, shaping frequency complementary modulus block can be arranged between directional coupler and rf detector.Shaping frequency is mended
The analog signal that module is changed to analog radio-frequency signal or based on analog radio-frequency signal performs Shape correction and frequency compensation processing.
Preferably, rf detector, directional coupler and shaping frequency complementary modulus block can be all integrated into radio-frequency transmissions level sensor
In 10, so as to improve level of integrated system, and cost is reduced.
Fig. 2 is the demonstrative structure of the radio-frequency transmissions level sensor radio frequency of the magnetic resonance imaging system according to embodiment of the present invention
Figure.As shown in Fig. 2 the radio-frequency transmissions level sensor 10 includes：
Directional coupler 11, for the mould for receiving analog radio-frequency signal from radio-frequency power amplifier or being changed based on analog radio-frequency signal
Intend signal, the analog signal changed to analog radio-frequency signal or based on analog radio-frequency signal performs power distribution processing；Wherein：It is fixed
To coupler 11 transmitting is coupled to by the analog radio-frequency signal of most of power or based on the analog signal that analog radio-frequency signal is changed
Coil (such as body coil or local coil), and by the analog radio-frequency signal of remaining fraction power or based on analog radio-frequency signal conversion
Analog signal be coupled to shaping frequency complementary modulus block 12；
Shaping frequency complementary modulus block 12, is changed for the analog radio-frequency signal come to the coupling of directional coupler 11 or based on analog radio-frequency signal
Analog signal perform Shape correction and frequency compensation processing, and by Shape correction and frequency compensation processing after analog radio-frequency signal,
Or Shape correction and frequency compensation processing after, based on analog radio-frequency signal change analog signal be sent to rf detector 13；
Rf detector 13, for shaping frequency complementary modulus block 12 is sent Shape correction and frequency compensation processing after analog radio frequency
Signal, or, Shape correction and frequency compensation processing after, based on analog radio-frequency signal change analog signal, perform down coversion
Processing, analog-to-digital conversion is sent to by the analog radio-frequency signal after down-converted or based on the analog signal that analog radio-frequency signal is changed
Device 14；
Analog-digital converter 14, is changed for the analog radio-frequency signal for sending rf detector 13 or based on analog radio-frequency signal
Analog signal is converted to data signal, and data signal is sent into control module 15；
Control module 15, for the SAR value based on data signal calculating simulation radiofrequency signal, when SAR value exceedes threshold value,
Generate alarm signal.
Radio-frequency transmissions level sensor 10 shown in Fig. 2 can also include controlling cable interface.Control module 15 is via control line
Cable interface sends alarm signal to the control unit of magnetic resonance imaging system.The control unit of magnetic resonance imaging system is based on alarm signal
Number closing radio-frequency power amplifier.
Radio-frequency transmissions level sensor 10 shown in Fig. 2 can also include CAN interface or serial ports.Control module 15 is via CAN
Interface or serial ports send the first message comprising SAR value to the control unit of magnetic resonance imaging system, and/or, from magnetic resonance into
The second message comprising SAR calculating parameters and/or the threshold value is received as the control unit of system.Control module 15 can also be through
Alarm signal is sent from serial ports to the control unit of magnetic resonance imaging system.
Rf detector 13 in Fig. 2 can be specifically embodied as narrow radio frequency detector or wide band radio-frequency detector.
Fig. 3 is the demonstrative structure figure of the narrow radio frequency detector according to embodiment of the present invention.
As seen from Figure 3, narrow radio frequency detector 13 includes：Bandpass filter 131, frequency mixer 132 and low pass filter 133.
The analog signal that wherein bandpass filter 131 is changed to analog radio-frequency signal or based on analog radio-frequency signal performs bandpass filtering；It is mixed
Frequency device 132 to the analog radio-frequency signal after bandpass filtering, or after bandpass filtering, based on analog radio-frequency signal change simulation letter
Number, perform Frequency mixing processing；Low pass filter 133 is to the analog radio-frequency signal after Frequency mixing processing or based on analog radio-frequency signal conversion
Analog signal perform LPF.
Fig. 4 is the demonstrative structure figure of the wide band radio-frequency detector according to embodiment of the present invention.From fig. 4, it can be seen that wide band radio-frequency
Detector 13 includes：Logafier 134 and low pass filter 135.Logafier 134 specifically may be embodied as diode.
The analog signal that logafier 134 is changed to analog radio-frequency signal or based on analog radio-frequency signal performs envelope detection；Low pass filtered
135 pairs of analog radio-frequency signals Jing Guo envelope detection of ripple device, or by envelope detection, based on analog radio-frequency signal change mould
Intend signal and perform LPF.
The example use to embodiment of the present invention is illustrated below.
Fig. 5 is the first example use of the radio-frequency transmissions level sensor of the magnetic resonance imaging system according to embodiment of the present invention
Structure chart.
As shown in figure 5, radio-frequency transmissions level sensor (TLS) 10 includes：
(1), directional coupler 11, for receiving analog radio-frequency signal or based on analog radio-frequency signal from radio-frequency power amplifier 20
The analog signal of conversion, the analog signal changed to analog radio-frequency signal or based on analog radio-frequency signal performs power distribution processing.
Analog radio-frequency signal is specifically as follows before 0 degree to before radiofrequency signal, 90 degree to radiofrequency signal, 0 degree of reflected radio-frequency signal or 90 degree
Reflected radio-frequency signal.The simulation that directional coupler 11 is changed by the analog radio-frequency signal of most of power or based on analog radio-frequency signal
Signal is coupled to transmitting coil 30 (such as body coil or local coil), and by the analog radio-frequency signal or base of remaining fraction power
The analog signal changed in analog radio-frequency signal is coupled to shaping frequency complementary modulus block 12.
(2), shaping frequency complementary modulus block 12, is believed for the analog radio-frequency signal come to the coupling of directional coupler 11 or based on analog radio frequency
Number conversion analog signal perform Shape correction and frequency compensation processing, and by Shape correction and frequency compensation processing after simulation penetrate
Frequency signal, or Shape correction and frequency compensation processing after, based on analog radio-frequency signal change analog signal be sent to radio frequency inspection
Survey device 13.
(3), rf detector 13, for the analog radio-frequency signal sent to shaping frequency complementary modulus block 12 or based on analog radio frequency letter
Number conversion analog signal perform down-converted, by the analog radio-frequency signal after down-converted, or after down-converted,
The analog signal changed based on analog radio-frequency signal is sent to modulus conversion chip 14.
(4), modulus conversion chip 14, for the analog radio-frequency signal for sending rf detector 13 or based on analog radio-frequency signal
The analog signal of conversion is converted to data signal, and data signal is sent into field programmable gate array 15.
(5), the field programmable gate array 15 of one or more integrated processor cores 151, for based on data signal calculating simulation
The SAR value of radiofrequency signal, when SAR value exceedes threshold value, generates alarm signal.
(6), controlling cable interface 163, for sending alarm signal to the control unit 31 of magnetic resonance imaging system.Magnetic resonance
The control unit 31 of imaging system is based on alarm signal and closes radio-frequency power amplifier 20.
(7), CAN interface 164, for sending first disappearing comprising SAR value to the control unit 31 of magnetic resonance imaging system
Breath, and/or, include the second of SAR calculating parameters and/or the threshold value from the reception of control unit 31 of magnetic resonance imaging system and disappear
Breath.
In addition, the radio-frequency transmissions level sensor 10 can also include dynamic random access memory (Dynamic Random
Access Memory, DRAM) 161, flash memory 162, static RAM (Static Random Access Memory,
SRAM) the add ons such as 165.
Fig. 6 is the second example use of the radio-frequency transmissions level sensor of the magnetic resonance imaging system according to embodiment of the present invention
Structure chart.
As shown in fig. 6, radio-frequency transmissions level sensor (TLS) 10 includes：
(1), directional coupler 11, for receiving analog radio-frequency signal or based on analog radio-frequency signal from radio-frequency power amplifier 20
The analog signal of conversion, the analog signal changed to analog radio-frequency signal or based on analog radio-frequency signal performs power distribution processing.
Analog radio-frequency signal is specifically as follows before 0 degree to before radiofrequency signal, 90 degree to radiofrequency signal, 0 degree of reflected radio-frequency signal or 90 degree
Reflected radio-frequency signal.The simulation that directional coupler 11 is changed by the analog radio-frequency signal of most of power or based on analog radio-frequency signal
Signal is coupled to transmitting coil 30 (such as body coil or local coil), and by the analog radio-frequency signal or base of remaining fraction power
The analog signal changed in analog radio-frequency signal is coupled to shaping frequency complementary modulus block 12.
(2), shaping frequency complementary modulus block 12, is believed for the analog radio-frequency signal come to the coupling of directional coupler 11 or based on analog radio frequency
Number conversion analog signal perform Shape correction and frequency compensation processing, and by Shape correction and frequency compensation processing after simulation penetrate
Frequency signal, or Shape correction and frequency compensation processing after, based on analog radio-frequency signal change analog signal be sent to radio frequency inspection
Survey device 13.
(3), rf detector 13, for the analog radio-frequency signal sent to shaping frequency complementary modulus block 12 or based on analog radio-frequency signal
The analog signal of conversion performs down-converted, by the analog radio-frequency signal after down-converted, or after down-converted, base
The analog signal changed in analog radio-frequency signal is sent to modulus conversion chip 14.
(4), modulus conversion chip 14, for the analog radio-frequency signal for sending rf detector 13 or based on analog radio-frequency signal
The analog signal of conversion is converted to data signal, and data signal is sent into microprocessor 151 and field programmable gate array 152.
(5), microprocessor 151 and field programmable gate array 152, for cooperating, with based on data signal calculating simulation
The SAR value of radiofrequency signal, and when SAR value exceedes threshold value, generate alarm signal.
(6), controlling cable interface 163, for sending alarm signal to the control unit 31 of magnetic resonance imaging system.Magnetic resonance
The control unit 31 of imaging system is based on alarm signal and closes radio-frequency power amplifier 20.
(7), serial ports 164, for sending the first message comprising SAR value to the control unit of magnetic resonance imaging system, and/or,
The second message comprising SAR calculating parameters and/or the threshold value is received from the control unit of magnetic resonance imaging system.
In addition, the radio-frequency transmissions level sensor can also include the add ons such as DRAM161, flash memory 162, SRAM165.
Fig. 7 is the 3rd example use of the radio-frequency transmissions level sensor of the magnetic resonance imaging system according to embodiment of the present invention
Structure chart.
As shown in fig. 7, radio-frequency transmissions level sensor (TLS) 10 includes：
(1), directional coupler 11, for receiving analog radio-frequency signal or based on analog radio frequency letter from radio-frequency power amplifier 20
Number conversion analog signal, to analog radio-frequency signal or based on the analog radio-frequency signal change analog signal perform power distribution at
Reason.Analog radio-frequency signal be specifically as follows before 0 degree to radiofrequency signal, before 90 degree to radiofrequency signal, 0 degree of reflected radio-frequency signal or
90 degree of reflected radio-frequency signals.Directional coupler 11 is turned by the analog radio-frequency signal of most of power or based on the analog radio-frequency signal
The analog signal changed is coupled to transmitting coil 30 (such as body coil or local coil), and by the analog radio frequency of remaining fraction power
Signal is coupled to shaping frequency complementary modulus block 12 based on the analog signal that the analog radio-frequency signal is changed.
(2), shaping frequency complementary modulus block 12, for the analog radio-frequency signal come to the coupling of directional coupler 11 or based on the analog radio frequency
Signal conversion analog signal perform Shape correction and frequency compensation processing, and by Shape correction and frequency compensation processing after simulation
Radiofrequency signal, or Shape correction and frequency compensation processing after, based on analog radio-frequency signal change analog signal be sent to radio frequency
Detector 13.
(3), rf detector 13, for the analog radio-frequency signal sent to shaping frequency complementary modulus block or based on the analog radio-frequency signal
The analog signal of conversion performs down-converted, by the analog radio-frequency signal after down-converted, or after down-converted, base
The analog signal changed in the analog radio-frequency signal, is sent to microprocessor 151 and coprocessor array 153.
(4), coprocessor array 153 and it is integrated with the microprocessor 151 of modulus conversion chip 14.Modulus conversion chip 14 is used
Digital letter is converted in the analog radio-frequency signal for sending rf detector 13 or based on the analog signal that analog radio-frequency signal is changed
Number.Moreover, microprocessor 151 and coprocessor array 153 cooperate with based on the data signal calculating simulation radiofrequency signal
SAR value, when SAR value exceed threshold value when, generate alarm signal.
(5), controlling cable interface 163, for sending alarm signal to the control unit 31 of magnetic resonance imaging system.Magnetic resonance
The control unit 31 of imaging system is based on alarm signal and closes radio-frequency power amplifier 20.
(6), serial ports 164, for sending the first message comprising SAR value to the control unit of magnetic resonance imaging system, and/or,
The second message comprising SAR calculating parameters and/or the threshold value is received from the control unit of magnetic resonance imaging system.
In addition, radio-frequency transmissions level sensor can also include the add ons such as DRAM161, flash memory 162, SRAM165.
Above by taking Fig. 5-Fig. 7 as an example, the example use structure of radio-frequency transmissions level sensor is specifically described.Art technology
Personnel are not used to constitute protection scope of the present invention and limited it is to be appreciated that this description is only exemplary.
Difference based on application environment and real needs, can implement the radio-frequency transmissions level sensor of the present invention in several ways.
Such as, can be by the radio-frequency transmissions level sensor printing of the present invention on a printed circuit, so as to constitute magnetic resonance imaging system
Control panel.
The invention also provides a kind of control panel of magnetic resonance imaging system.Fig. 8 be according to the magnetic resonance of embodiment of the present invention into
As the circuit layout of the control panel of system.
As shown in figure 8, the control panel 40 includes：
Substrate 7；
The analog-digital converter 14 on substrate 7 is arranged in, for the simulation changed by analog radio-frequency signal or based on analog radio-frequency signal
Signal, is converted to data signal；
The control module 15 on substrate 7 is arranged in, for the SAR value based on data signal calculating simulation radiofrequency signal, works as SAR
When value exceedes threshold value, alarm signal is generated.
In one embodiment, in addition to：
The controlling cable interface 163 on substrate 7 is arranged in, for sending alarm signal；
The CAN interface 164 on substrate 7 is arranged in, the first message of SAR value is included for sending, and/or, reception is included
Second message of SAR calculating parameters and/or the threshold value.
Preferably, serial ports can also be arranged on substrate 7.Serial ports is used to send alarm signal and/or first message, and/or, connect
Receive the second message.
Structure shown in Fig. 2 is also based on, directional coupler 11, the and of shaping frequency complementary modulus block 12 are further arranged on the substrate 7
Rf detector 13.
Specifically, substrate 7 may be embodied as：FR-1；FR-2；FR-3；FR-4；FR-5；FR-6；G-10；CEM-1CEM-2；
CEM-3CEM-4；CEM-5；Aluminium nitride (AIN)；Carborundum (SIC) etc..
Based on foregoing description, the invention also provides a kind of control system of magnetic resonance imaging system.
Fig. 9 is the structure chart of the control system of the magnetic resonance imaging system according to embodiment of the present invention.
As shown in figure 9, the system 50 includes：
Radio-frequency power amplifier 20, for amplifying and exporting analog radio-frequency signal；
Radio-frequency transmissions level sensor 10, for detecting analog radio-frequency signal, digital radio signal is converted to by analog radio-frequency signal,
The SAR value of digital radio signal is calculated, when SAR value exceedes threshold value set in advance, alarm signal is sent；
Control unit 31, for closing radio-frequency power amplifier 20 based on alarm signal.
In summary, different from analog radio-frequency signal is converted into numeral by the control unit of magnetic resonance imaging system in the prior art
Radiofrequency signal simultaneously calculates SAR value, and in embodiments of the present invention, radio-frequency transmissions level sensor is by analog radio-frequency signal or is based on
The analog signal of analog radio-frequency signal conversion is converted to data signal, and calculates SAR value, so as to reduce to magnetic resonance imaging system
The resource requirement of the control unit of system.
Moreover, in embodiments of the present invention, radio-frequency transmissions level sensor to the control unit of magnetic resonance imaging system without sending out
Analog radio-frequency signal is sent, so as to reduce transmission bandwidth demand, it is to avoid the noise during analog signal transmission, and improved
The accuracy in computation of SAR value.
Not only in this, in embodiments of the present invention, function and SAR can be detected by integrated RF in radio-frequency transmissions level sensor
It is worth calculation function, the processor core of such as central processing unit core or microprocessor core etc can also be integrated into field programmable gate
In array, so as to also improve level of integrated system, and cost is reduced.
It is described above, it is only the better embodiment of the present invention, is not intended to limit the scope of the present invention.It is all this
Within the spirit and principle of invention, any modification, equivalent substitution and improvements made etc. should be included in the protection model of the present invention
Within enclosing.
Claims (10)
1. a kind of radio-frequency transmissions level sensor of magnetic resonance imaging system, it is characterised in that including：
One analog-digital converter, for the analog signal changed by an analog radio-frequency signal or based on the analog radio-frequency signal, is turned
It is changed to a data signal；
One control module, for calculating a specific absorption rate value of the analog radio-frequency signal based on the data signal, and works as institute
When stating specific absorption rate value more than a threshold value, an alarm signal is generated.
2. radio-frequency transmissions level sensor according to claim 1, it is characterised in that the control module includes：
One or more field programmable gate arrays；Or
One field programmable gate array, one or more integrated processor cores of the field programmable gate array；Or
One or more processors and one or more field programmable gate arrays；Or
One or more processors and one or more coprocessor arrays；Or
One or more processors.
3. radio-frequency transmissions level sensor according to claim 1, it is characterised in that also include：
One directional coupler, is arranged in the front end of the analog-digital converter, for receiving the analog radio-frequency signal or based on described
The analog signal of analog radio-frequency signal conversion, and the simulation changed to the analog radio-frequency signal or based on the analog radio-frequency signal
Signal performs power distribution processing.
4. radio-frequency transmissions level sensor according to claim 3, it is characterised in that also include：
One rf detector, is arranged between the directional coupler and the analog-digital converter, for detecting the analog radio frequency
Signal or the analog signal changed based on the analog radio-frequency signal, and to the analog radio-frequency signal or based on the analog radio frequency
The analog signal of signal conversion performs a down-converted.
5. radio-frequency transmissions level sensor according to claim 4, it is characterised in that the rf detector includes：
One envelope detector and a low pass filter；Or
One bandpass filter, a frequency mixer and a low pass filter.
6. radio-frequency transmissions level sensor according to claim 4, it is characterised in that also include：
One shaping frequency complementary modulus block, is arranged between the directional coupler and the rf detector, for the analog radio frequency
Signal or the analog signal changed based on the analog radio-frequency signal perform a Shape correction and frequency compensation processing.
7. the radio-frequency transmissions level sensor according to any one of claim 1-6, it is characterised in that also include：
One controlling cable interface, for sending the alarm signal；And/or
One controller LAN interface, a first message of the specific absorption rate value is included for sending, and/or, receive and include one
One second message of specific absorption rate calculating parameter and/or the threshold value；And/or
One serial ports, for sending the alarm signal and/or the first message, and/or, receive second message.
8. a kind of control panel of magnetic resonance imaging system, it is characterised in that including：
One substrate；
The analog-digital converter of arrangement on the substrate, for by the analog radio-frequency signal or based on the analog radio-frequency signal
The analog signal of conversion is converted to a data signal；
The control module of arrangement on the substrate, the ratio for calculating the analog radio-frequency signal based on the data signal
Absorptance values, when the specific absorption rate value is more than a threshold value, generate an alarm signal.
9. control panel according to claim 8, it is characterised in that also include：
The controlling cable interface of arrangement on the substrate, for sending the alarm signal；And/or
The controller LAN interface of arrangement on the substrate, a first message of the specific absorption rate value is included for sending,
And/or, receive one second message comprising a specific absorption rate calculating parameter and/or the threshold value；And/or
The serial ports of arrangement on the substrate, for sending the alarm signal and/or the first message, and/or, receive institute
State the second message.
10. a kind of control system of magnetic resonance imaging system, it is characterised in that including：
One radio-frequency power amplifier, for amplifying and exporting an analog radio-frequency signal；
One radio-frequency transmissions level sensor, for detecting the analog radio-frequency signal, a number is converted to by the analog radio-frequency signal
Word radiofrequency signal, calculates a specific absorption rate value of the digital radio signal, when the specific absorption rate value exceedes set in advance one
During threshold value, an alarm signal is sent；
One control unit, for closing the radio-frequency power amplifier based on the alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610100092.XA CN107045114A (en) | 2016-02-05 | 2016-02-05 | Radio-frequency transmissions level sensor, control panel and the system of magnetic resonance imaging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610100092.XA CN107045114A (en) | 2016-02-05 | 2016-02-05 | Radio-frequency transmissions level sensor, control panel and the system of magnetic resonance imaging system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107045114A true CN107045114A (en) | 2017-08-15 |
Family
ID=59543709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610100092.XA Pending CN107045114A (en) | 2016-02-05 | 2016-02-05 | Radio-frequency transmissions level sensor, control panel and the system of magnetic resonance imaging system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107045114A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109419508A (en) * | 2017-09-01 | 2019-03-05 | 西门子(深圳)磁共振有限公司 | Realize system, the device and method of the safe implantation material scanning safety of Magneti Resonant Condition |
| CN109490801A (en) * | 2017-09-12 | 2019-03-19 | 西门子(深圳)磁共振有限公司 | The detection method and device of the transmitting antenna level sensor of magnetic resonance imaging system |
| CN113303781A (en) * | 2021-04-30 | 2021-08-27 | 鑫高益医疗设备股份有限公司 | Gating synchronous magnetic resonance SAR value monitoring method, device, storage medium and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102100555A (en) * | 2009-12-17 | 2011-06-22 | 株式会社东芝 | Magnetic resonance imaging apparatus and magnetic resonance imaging method |
| CN103309265A (en) * | 2013-05-21 | 2013-09-18 | 北京大学 | Small-sized nuclear magnetic resonance equipment controller used for one-dimensional spectrum analysis |
| CN103855453A (en) * | 2012-11-29 | 2014-06-11 | 西门子公司 | Directional coupler, in particular having high coupling attenuation |
| CN104224181A (en) * | 2014-09-26 | 2014-12-24 | 中国科学院生物物理研究所 | SAR (Specific Absorption Rate) real-time monitoring system and method of multi-channel magnetic resonance imaging equipment |
-
2016
- 2016-02-05 CN CN201610100092.XA patent/CN107045114A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102100555A (en) * | 2009-12-17 | 2011-06-22 | 株式会社东芝 | Magnetic resonance imaging apparatus and magnetic resonance imaging method |
| CN103855453A (en) * | 2012-11-29 | 2014-06-11 | 西门子公司 | Directional coupler, in particular having high coupling attenuation |
| CN103309265A (en) * | 2013-05-21 | 2013-09-18 | 北京大学 | Small-sized nuclear magnetic resonance equipment controller used for one-dimensional spectrum analysis |
| CN104224181A (en) * | 2014-09-26 | 2014-12-24 | 中国科学院生物物理研究所 | SAR (Specific Absorption Rate) real-time monitoring system and method of multi-channel magnetic resonance imaging equipment |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109419508A (en) * | 2017-09-01 | 2019-03-05 | 西门子(深圳)磁共振有限公司 | Realize system, the device and method of the safe implantation material scanning safety of Magneti Resonant Condition |
| CN109490801A (en) * | 2017-09-12 | 2019-03-19 | 西门子(深圳)磁共振有限公司 | The detection method and device of the transmitting antenna level sensor of magnetic resonance imaging system |
| CN109490801B (en) * | 2017-09-12 | 2021-04-27 | 西门子(深圳)磁共振有限公司 | Method and apparatus for detecting transmitting antenna level sensor of magnetic resonance imaging system |
| CN113303781A (en) * | 2021-04-30 | 2021-08-27 | 鑫高益医疗设备股份有限公司 | Gating synchronous magnetic resonance SAR value monitoring method, device, storage medium and system |
| CN113303781B (en) * | 2021-04-30 | 2022-05-13 | 鑫高益医疗设备股份有限公司 | Gating synchronization magnetic resonance SAR value monitoring method, device, storage medium and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105137375B (en) | Radio-frequency channel calibration method and device, SAR measurement method, magnetic resonance system | |
| US20170143231A1 (en) | Monitoring the body using microwaves | |
| CN103777159B (en) | The control method of the high-frequency radiator of MRT system | |
| US7622921B2 (en) | Method and device for monitoring radio-frequency exposure in a magnetic resonance measurement | |
| Cho et al. | Detection of heart rate through a wall using UWB impulse radar | |
| TWI712392B (en) | Multi-target vital sign detection system and method | |
| CN104224181B (en) | A kind of SAR real-time monitoring system of multi-channel magnetic resonance imaging equipment and method | |
| CN107045114A (en) | Radio-frequency transmissions level sensor, control panel and the system of magnetic resonance imaging system | |
| CN109690339B (en) | Transmitting and/or receiving Radio Frequency (RF) system for magnetic resonance examination system and method thereof | |
| KR20160132920A (en) | Scattering tomography method and scattering tomography device | |
| WO2020000870A1 (en) | Electromagnetic radiation detecting system and detecting method | |
| CN105929395A (en) | Electromagnetic imaging system and method employing oblique incident wave | |
| CN109655670A (en) | The high high radiation field effect test system and test method that low level directly drives | |
| CN106771672A (en) | The method and device of Far-Field antennas measurement system is carried out based on cubic spline interpolation | |
| CN106841939A (en) | The portable acoustoelectric combined detection means of GIS partial discharge and its detection method | |
| CN109655671A (en) | Low level scans the high high radiation field effect test system and test method of electric current | |
| CN107561464A (en) | Magnetic resonance radio frequency coil and magnetic resonance system | |
| CN113017598B (en) | Radio frequency energy deposition prediction and monitoring method, device, equipment and medium | |
| CN107290697A (en) | Magnetic resonance radio frequency coil and magnetic resonance system | |
| CN204633783U (en) | The wireless anti-cheating device of detecting sweep-frequency Békésy audiometer | |
| CN204683596U (en) | A kind of electromagnetic wave signal blood processor | |
| CN106772161A (en) | The multichannel array type receiving coil and detection method of radio sensing network | |
| CN105959019B (en) | Big bandwidth communication signal receiving analyzer based on binary channels Phase Stacking and method | |
| CN106814244A (en) | A kind of radio-frequency power of magnetic resonance imaging system calculates apparatus and method | |
| CN104515961B (en) | MR imaging method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170815 |