CN106597331B - Radio frequency cable detection loop for magnetic resonance system and safety monitoring method - Google Patents
Radio frequency cable detection loop for magnetic resonance system and safety monitoring method Download PDFInfo
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- CN106597331B CN106597331B CN201611244911.4A CN201611244911A CN106597331B CN 106597331 B CN106597331 B CN 106597331B CN 201611244911 A CN201611244911 A CN 201611244911A CN 106597331 B CN106597331 B CN 106597331B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a radio frequency cable detection loop for a magnetic resonance system and a magnetic resonance radio frequency safety monitoring method, wherein the radio frequency cable detection loop comprises a receiver (3), a signal source S for correcting signals, a change-over switch and a short-circuit direct connection line (9), the receiver (3) is connected with a radio frequency cable (8), the radio frequency cable (8) is connected with one end of the short-circuit direct connection line (9) through the change-over switch, the signal source S is connected with the other end of the short-circuit direct connection line (9), and the signal source S, the radio frequency cable (8) and the receiver (3) form a closed detection loop. According to the radio frequency cable detection circuit and the magnetic resonance radio frequency safety monitoring method, the loss of the radio frequency cable is measured in real time according to the actual situation of a site, and the radio frequency power absorbed by a patient and the specific absorption rate are calculated and controlled by utilizing the measured loss of the radio frequency cable, so that the site wiring is greatly simplified, and the accuracy of a magnetic resonance radio frequency safety monitoring algorithm is improved.
Description
The application is a divisional application of Chinese patent application with the name of 'radio frequency cable detection loop, magnetic resonance radio frequency safety monitoring system and control method thereof', which is filed by Chinese patent office with the application number of 201310553510.7 on 08.11.2013.
Technical Field
The invention relates to the field of magnetic resonance, in particular to a radio frequency cable detection loop for a magnetic resonance system and a safety monitoring method.
Background
The medical magnetic system images the part to be detected of the patient under the combined action of the static magnetic field B0, the gradient field and the radio frequency field B1, however, under the irradiation of the radio frequency field B1, the patient can generate SAR (Specific Absorption Rate), the current fast imaging and high-field magnetic resonance require the emitted radio frequency power to be increasingly large, so that the patient is required to bear more electromagnetic radiation, in order to ensure the safety of the patient according to the requirements of IEC60601, the magnetic resonance system needs to be provided with an SAR safety monitoring system for monitoring the SAR absorbed by the patient in real time, the SAR monitor needs to have very high precision, and the SAR value calculated by the system is ensured to be accurate.
Fig. 1 is a schematic structural diagram of a frame of a magnetic resonance radio frequency security monitoring system, please refer to fig. 1, the magnetic resonance system is generally divided into three rooms, namely, a device room, a scanning room and an operating room, wherein the operating room is a room of a doctor operating system, the scanning room is a room for scanning a patient, a magnet system, a gradient system, a radio frequency transmitting/receiving coil and other components are arranged in the general scanning room, in order to monitor the radio frequency power irradiated to the patient from a transmitting coil 6, a power coupler 5 is arranged in front of the transmitting coil 6, forward and reverse radio frequency power is coupled into a small part, the small part is transmitted to a system receiver 3 for sampling, the radio frequency power absorbed by the patient is calculated, the system calculates the SAR according to the power absorbed by the patient and the weight of the patient, the real-time monitoring SAR does not exceed standard requirements, and the. The magnetic resonance equipment room is generally provided with high-power components, such as a radio frequency power amplifier 2, a receiver for receiving magnetic resonance signals, a related control data processing system and the like. The signal coupled from the power coupler 5 is transmitted to the receiver 3 via a long radio frequency cable 8, which is required to be variable in length in order to fit the site layout of each hospital, shorter for sites with close distances between devices and between scans, and longer for sites with longer distances between devices and between scans. However, the values obtained by attenuating the coupled rf signals through rf cables 8 with different lengths are different, the attenuated signals are amplified and calculated to restore the rf power values, and if the attenuation values of the cables are not correct, the calculation results are greatly affected. The conventional method is to fix the length of the cable from the power coupler 5 to the receiver 3, and to use the longer radio frequency cable 8 all the time regardless of the size and distance of the site, so that the accuracy of power detection can be ensured, but the flexibility of site arrangement is sacrificed, the long radio frequency cable 8 needs to be coiled and fixed on the site, so that the cost of the cable is increased, the site arrangement is inconvenient, and the electromagnetic compatibility problem can be caused by the overlong cable.
Disclosure of Invention
The invention aims to provide a radio frequency cable detection loop and a magnetic resonance radio frequency safety monitoring method, which can simplify field wiring and improve the accuracy of magnetic resonance radio frequency safety monitoring.
The invention provides a radio frequency cable detection loop for a magnetic resonance system, which comprises a receiver, a signal source S for correcting signals, a change-over switch and a short-circuit direct connection line, wherein the receiver is connected with a radio frequency cable, the radio frequency cable is connected with one end of the short-circuit direct connection line through the change-over switch, the signal source S is connected with the other end of the short-circuit direct connection line, and the signal source S, the radio frequency cable and the receiver form a closed detection loop.
In the radio frequency cable detection loop, the signal source S is arranged inside the receiver (3).
In the radio frequency cable detection loop, the receiver (3) comprises multiple signal input ends, and the signal source S and one of the signal input ends are connected to the same radio frequency cable (8) through a selector switch (S1).
The technical solution adopted to solve the above technical problems is to provide a control method for the magnetic resonance radio frequency safety monitoring system, which includes the following steps: a) by controlling the change-over switch, a signal source S, a radio frequency cable and a signal input end of the receiver form a closed detection loop; b) calculating the actual Loss of each radio frequency cable; c) connecting a signal input end of the receiver and a signal output end of the power coupler by controlling a selector switch, and acquiring forward coupling power PF and reverse coupling power PR; d) and calculating the radio frequency Power absorbed by the patient in real time according to the actual Loss of the radio frequency cable, the forward coupling Power PF and the reverse coupling Power PR.
In the control method of the magnetic resonance radio frequency safety monitoring system, the radio frequency Power is calculated as follows:
Power＝0.001*10^((PF+Loss+X)/10)-0.001*10^((PR+Loss+X)/10)-CoilPowerloss；
the specific absorption rate SAR of the patient is calculated as follows: SAR is Power/mass;
wherein, X is the coupling degree of the power coupler, CoilPowerloss is the loss of the transmitting coil, and mass is the weight of the patient.
The control method of the magnetic resonance radio frequency safety monitoring system includes that the signal source S is arranged in a receiver, the receiver is provided with multiple signal input ends, each signal input end is connected with a signal output end of the power coupler through a radio frequency cable, the signal source S is connected with one of the signal input ends on one radio frequency cable through a selector switch S1, and the actual Loss of each radio frequency cable is calculated as follows:
loss (REF-PS-3 × SwLoss)/2, where REF is a correction signal, a power level received by a signal input terminal of the receiver connected to the switch S1, PS is a power level of the signal source S, and SwLoss is a Loss of the switch.
In the control method of the magnetic resonance radio frequency safety monitoring system, the signal source S is disposed in the power coupler and connected to the short-circuit direct connection line through a short cable or a PCB trace, and the actual Loss of each radio frequency cable is calculated as follows:
and (REF-PS-SwLoss), wherein when REF is a correction signal, the power level received by the signal input end connected with the receiver and the switch, PS is the power level of the signal source S, and SwLoss is the Loss of the switch.
The signal source S is a low-frequency oscillation source, a gate limiter circuit is arranged in front of the low-frequency oscillation source, the actual Loss low of each radio-frequency cable during safety monitoring is 1/K of Loss obtained through correction measurement, K is an attenuation value ratio measured at two different frequencies w0 and w _ cal, w0 is the frequency of the radio-frequency signal used for SAR calculation, and w _ cal is the frequency of the signal source S used for calibration.
In the control method of the magnetic resonance radio frequency safety monitoring system, the signal source S is a dc voltage constant current source, and the actual Loss of each radio frequency cable is calculated as follows: loss is pass 0 (U/(I R)), where I is the current intensity, U is the voltage drop of the dc voltage constant current source after passing through the rf cable, R is the unit Loss of the rf cable under the dc voltage constant current source, and pass 0 is the unit Loss of the rf cable at the frequency of the rf signal used for SAR calculation.
Compared with the prior art, the invention has the following beneficial effects: according to the radio frequency cable detection loop, the magnetic resonance radio frequency safety monitoring system and the control method thereof, the signal source S, the change-over switch and the short-circuit direct connection line form the closed detection loop, the loss of the radio frequency cable is measured in real time according to the actual situation of a site, and the radio frequency power absorbed by a patient and the specific absorption rate are calculated and controlled by utilizing the measured loss of the radio frequency cable, so that the site wiring is greatly simplified, and the accuracy of a magnetic resonance radio frequency safety monitoring algorithm is improved.
Drawings
FIG. 1 is a schematic diagram of a framework of a magnetic resonance RF security monitoring system;
FIG. 2 is a schematic diagram illustrating the distribution and connection of calibration signal sources in the magnetic resonance RF security monitoring system according to the present invention;
fig. 3 is another schematic diagram of the distribution connection of the calibration signal source in the magnetic resonance rf security monitoring system according to the present invention.
In the figure:
1 upper computer 2 radio frequency power amplifier 3 receiver
4 power divider 5 power coupler 6 transmitting coil
7 short-circuit direct connection of 8 radio frequency cables of receiving coil array 9
Detailed Description
The invention is further described below with reference to the figures and examples.
Fig. 2 is a schematic diagram of the distribution and connection of the calibration signal sources in the magnetic resonance rf security monitoring system according to the present invention.
Referring to fig. 1 and 2, the radio frequency cable detection circuit provided by the present invention includes a signal source S for calibration, a switch, and a short-circuit direct connection 9, where the signal source S is connected to one end of the short-circuit direct connection 9, and the other end of the short-circuit direct connection 9 is connected to a radio frequency cable 8 through the switch to form a closed detection circuit.
The magnetic resonance radio frequency safety monitoring system provided by the invention comprises a receiver 3 and a transmitting coil 6, wherein a power coupler 5 is arranged in front of the transmitting coil 6, the receiver 3 is connected with the power coupler 5 through a radio frequency cable 8, the magnetic resonance radio frequency safety monitoring system also comprises the radio frequency cable detection loop, and when a signal source S is connected with a short circuit straight connecting wire 9 through a change-over switch, the signal source S, the radio frequency cable 8 and the receiver 3 form a closed detection loop.
In the magnetic resonance radio frequency safety monitoring system provided by the invention, the signal source S can be generally arranged in the receiver 3, the receiver 3 is provided with a plurality of signal input ends, each signal input end is connected with the signal output end of the power coupler 5 through a radio frequency cable 8, and the signal source S is connected with one signal input end on the radio frequency cable 8 through the change-over switch S1. The short-circuit straight line 9 may be disposed in the power coupler 5, one end of the short-circuit straight line 9 may be connected to the rf cable 8 through the switch S2, and the other end may be connected to the rf cable 8 through the switch S3.
The influence of the actual loss value of the existing radio frequency cable on SAR calculation is as follows: in the magnetic resonance system, a radio frequency signal passes through a radio frequency Power amplifier 2, is distributed by a Power divider 4, passes through Power couplers 5 respectively, and is fed into a transmitting coil 6, and the radio frequency Power generates SAR on a patient through the transmitting coil 6, wherein the SAR is related to Power absorbed by the patient, and the SAR is Power/mass, wherein the mass is the weight of the patient. The power level is typically detected by the power coupler 5 and the receiver 3, and for a two-channel system, the power coupler typically couples out 4 signals, which are a first forward channel, a first reverse channel, a second forward channel, and a second reverse channel, respectively. As shown in fig. 2, F _1, F _2, R _1, R _2 are the power coupled to the first forward channel, the second forward channel, the first backward channel, and the second backward channel, respectively, assuming that the coupling degree of the power coupler is x (db), the attenuation of the rf cable is loss (db), the first forward channel voltage detected by the receiver is U _ F _1(V), the first backward channel voltage is U _ R _1(V), the second forward channel voltage is U _ F _2(V), the second backward channel voltage is U _ R _2(V), the forward power at the receiver is PF 10log ((U _ F _1^2/Z0) + (U _ F _ 2/Z0)/0.001) (dBm), the backward power is PR 10log ((U _ R _1^2/Z0) + (U _ R _ 2/Z0)/0.001) (dBm), where Z0 is the characteristic impedance of the system. According to the forward Power PF and the reverse Power PR, the forward Power at the Power coupler end is calculated to be PF + Loss + X and the reverse Power PR + Loss + X by considering the attenuation Loss (Loss) (dB) of the radio frequency cable and the coupling degree X (dB) of the Power coupler, and then the Power absorbed by the patient can be calculated to be 0.001 ^ 10^ PF + Loss + X)/10) -0.001 ^ 10^ (PR + Loss + X)/10) -CoilPowerloss and SAR ═ Power/mass according to the Loss CoilPowerloss of the transmitting coil. It can be seen that in this patient absorbed power monitoring system, the loss of the radio frequency cable affects the final calculated SAR value.
The actual attenuation value of the used radio frequency cable is measured, as shown in fig. 2, the working process and the control method of the invention are as follows: when the safety monitoring is normally performed, S1 is connected to the ADC1, S2 and S3 are connected to F _1 and F _2, respectively, during calibration, the signal source S placed inside the receiver is switched through the switch S1 (the signal source has calibrated the power level of the transmitted signal before factory shipment and is used as a reference for measuring the actual attenuation, assuming that S is 0dBm in this embodiment), S2 and S3 are switched to the short-circuit direct connection 9, so that the rf power transmitted by the signal source S returns to the signal input terminal ADC2 of the receiver through two equal-length rf cables 8, and the power level received by the ADC2 is set to be REF (dBm), the attenuation value of each rf cable 8 is calculated to be Loss (REF-PS-3 Sw)/2, PS is the power level of the signal source S, Sw is the Loss of the switch, and by the calibration method, the actual Loss of the rf cable 8 used for rf monitoring can be measured, the calibration method can be completed once after the system is installed and the Loss is recorded in the system, and can also be recalibrated when the radio frequency cable is replaced each time, so that the radio frequency monitoring precision after the cable is replaced can be ensured even if the length or the Loss value of a line changes. By the calibration method, according to different site configuration conditions, different radio frequency cable loss values can be called by the safety monitoring calculation software, and the SAR is calculated correctly, so that the safety of a patient is ensured.
In the magnetic resonance radio frequency safety monitoring system provided by the invention, the signal source S for calibration may be placed elsewhere, may not be in the receiver 3, such as integrated in the magnetic resonance transmitter, and is switched to the calibration signal by the transmitter through a switch, or integrated in other electronic components, as long as the attenuation (such as a cable with a fixed length) transmitted to the power coupler path is known, for example, the length of the cable from the signal source S to the power coupler is the same as that of the radio frequency cable in fig. 2, or the amplitude of the signal transmitted from the signal source to the power coupler end is calibrated before factory shipment, the accurate power value may be calculated according to the above calculation method, and is not limited to the hardware connection diagram in fig. 2.
Fig. 3 is another schematic diagram of the distribution connection of the calibration signal source in the magnetic resonance rf security monitoring system according to the present invention. Referring to fig. 3, the signal source S is disposed in the power coupler 5 and connected to the short-circuit straight line 9 through a short cable or a PCB trace, which is advantageous in that the calibration signal source S and the power coupler 5 can be integrated into the same circuit module, thereby enhancing reliability. At this time, the attenuation value of each radio frequency cable is measured as Loss ═ REF-PS-Sw.
The calibration signal source S does not necessarily use the same rf frequency as the system, and for implementation convenience, the calibration signal may be a low frequency signal, and in general, the low frequency signal is easier to implement, for example, a low frequency oscillation source is added in the circuit of the power coupler 5, the calibration level is ensured through gate clipping, if the low frequency signal is used, there is a conversion relationship between the cable attenuation of the low frequency signal and the cable attenuation of the high frequency signal, the frequency of the rf signal used for SAR calculation is set as w0, the frequency of the calibration signal source is set as w _ cal, and the attenuation of the rf cable at the frequency of w _ cal is measured to be k times of the attenuation of the rf cable at the frequency of w0, so that the attenuation Loss used for calculating the SAR value can be obtained by multiplying the measured attenuation. K is the ratio of the attenuation measured by the radio frequency cable at two different frequencies w0 and w cal.
In addition, the calibration signal source S may use a direct current voltage (constant current source, assuming current I), and may also calculate the total rf attenuation Loss of the rf cable for monitoring by using the voltage drop u (v) and the unit Loss R (ohm/m) of the rf cable at the direct current and the unit Loss0 of the rf cable at the frequency:
Loss＝Loss0*(U/(I*R))。
although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The radio frequency cable detection loop for the magnetic resonance system is characterized by comprising a receiver (3), a signal source S for correcting signals, a change-over switch and a short-circuit direct connection line (9), wherein the receiver (3) is connected with a radio frequency cable (8), when the radio frequency cable (8) is connected with one end of the short-circuit direct connection line (9) through the change-over switch, and the signal source S is connected with the other end of the short-circuit direct connection line (9), the signal source S, the radio frequency cable (8) and the receiver (3) form a closed detection loop.
2. Detection loop according to claim 1, characterized in that said signal source S is arranged inside said receiver (3).
3. A detection circuit according to claim 2, characterized in that the receiver (3) comprises multiple signal inputs, and the signal source S is connected to the same rf cable (8) through a switch and one of the signal inputs.
4. A magnetic resonance radio frequency safety monitoring method is characterized by comprising the following steps:
a) by controlling the change-over switch, the signal input ends of the signal source S, the radio frequency cable (8) and the receiver (3) form a closed detection loop;
b) calculating the actual Loss of each radio frequency cable (8);
c) connecting a signal input end of the receiver (3) and a signal output end of the power coupler (5) by controlling a selector switch, and acquiring forward coupling power PF and reverse coupling power PR;
d) and calculating the radio frequency Power absorbed by the patient in real time according to the actual Loss, the forward coupling Power PF and the reverse coupling Power PR of the radio frequency cable (8).
5. The magnetic resonance radio frequency security monitoring method of claim 4, wherein the radio frequency Power is calculated as follows:
Power＝0.001*10^((PF+Loss+X)/10)-0.001*10^((PR+Loss+X)/10)-CoilPowerloss；
the specific absorption rate SAR of the patient is calculated as follows: SAR is Power/mass;
wherein, X is the coupling degree of the power coupler, CoilPowerloss is the loss of the transmitting coil, and mass is the weight of the patient.
6. The magnetic resonance radio frequency security monitoring method according to claim 4, wherein the signal source S is disposed in the receiver (3), the receiver (3) is provided with multiple signal input ends, each signal input end is connected to the signal output end of the power coupler (5) through a radio frequency cable (8), the signal source S is connected to one of the signal input ends through a switch and a radio frequency cable (8), and the actual Loss of each radio frequency cable (8) is calculated as follows:
and (REF-PS-3) SwLoss)/2, wherein when REF is a correction signal, the power level received by the signal input end connected with the receiver (3) and the switch is the power level of the signal source S, PS is the power level of the signal source S, and SwLoss is the Loss of the switch.
7. The magnetic resonance radio frequency security monitoring method according to claim 4, wherein the signal source S is arranged in the power coupler (5) and connected to the short-circuited straight line (9) by a short cable or PCB trace, and the actual Loss Loss of each radio frequency cable (8) is calculated as follows:
and (REF-PS-SwLoss), wherein when REF is a correction signal, the power level received by a signal input end connected with the receiver (3) and the change-over switch, PS is the power level of the signal source S, and SwLoss is the Loss of the change-over switch.
8. The magnetic resonance radio frequency safety monitoring method according to any one of claims 4 to 7, characterized in that the signal source S is a low frequency oscillation source, a gate circuit clipping circuit is arranged in front of the low frequency oscillation source, the actual Loss Loss of each radio frequency cable (8) during safety monitoring is 1/K of the Loss obtained by correction measurement, K is the attenuation value ratio measured at two different frequencies w0 and w _ cal, wherein w0 is the frequency of the radio frequency signal used for SAR calculation, and w _ cal is the frequency of the signal source S used for calibration.
9. The magnetic resonance radio frequency security monitoring method according to any one of claims 4 to 7, wherein the signal source S is a DC voltage constant current source, and the actual Loss of each radio frequency cable (8) is calculated as follows: loss is pass 0 (U/(I R)), where I is the current intensity, U is the voltage drop of the dc voltage constant current source after passing through the rf cable, R is the unit Loss of the rf cable under the dc voltage constant current source, and pass 0 is the unit Loss of the rf cable at the frequency of the rf signal used for SAR calculation.
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| CN201611244911.4A CN106597331B (en) | 2013-11-08 | 2013-11-08 | Radio frequency cable detection loop for magnetic resonance system and safety monitoring method |
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| CN201611244911.4A CN106597331B (en) | 2013-11-08 | 2013-11-08 | Radio frequency cable detection loop for magnetic resonance system and safety monitoring method |
| CN201310553510.7A CN104215828B (en) | 2013-11-08 | 2013-11-08 | RF cable measure loop, magnetic resonance radio frequency safety monitoring system and its control method |
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| CN105301377A (en) * | 2014-06-19 | 2016-02-03 | 联想移动通信科技有限公司 | Method, apparatus and system for measuring RF line loss |
| US9897681B2 (en) * | 2015-03-02 | 2018-02-20 | Rohde & Schwarz Gmbh & Co. Kg | Calibration method and calibration arrangement |
| CN105610521B (en) * | 2016-01-12 | 2018-10-12 | 上海斐讯数据通信技术有限公司 | A kind of method and terminal of terminal radio frequency calibration |
| CN107874757B (en) * | 2016-09-30 | 2023-06-09 | 通用电气公司 | Magnetic resonance radio frequency subsystem and coil decoupling device and method for same |
| CN107300679A (en) * | 2017-08-19 | 2017-10-27 | 安徽雷宇电子科技有限公司 | The microwave detection system that a kind of use radio frequency traveling wave technology for detection superconduction is quenched |
| 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 |
| CN112886988B (en) * | 2021-04-08 | 2022-11-22 | 维沃移动通信有限公司 | Radio frequency system, radio frequency circuit detection method and device and electronic equipment |
| CN113872705B (en) * | 2021-10-27 | 2024-02-13 | 上海移远通信技术股份有限公司 | Terminal test line loss detection method, device, system, terminal and medium |
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| CN106597331A (en) | 2017-04-26 |
| CN104215828A (en) | 2014-12-17 |
| CN104215828B (en) | 2017-10-03 |
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