CN108627791B - Magnetic resonance spectrometer and magnetic resonance imaging system - Google Patents
Magnetic resonance spectrometer and magnetic resonance imaging system Download PDFInfo
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- CN108627791B CN108627791B CN201810444401.4A CN201810444401A CN108627791B CN 108627791 B CN108627791 B CN 108627791B CN 201810444401 A CN201810444401 A CN 201810444401A CN 108627791 B CN108627791 B CN 108627791B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/58—Calibration of imaging systems, e.g. using test probes, Phantoms; Calibration objects or fiducial markers such as active or passive RF coils surrounding an MR active material
Abstract
The application provides a magnetic resonance spectrometer and magnetic resonance imaging system for realize the performance index of magnetic resonance imaging system self-checking radio frequency coil, this magnetic resonance spectrometer includes: radio frequency transmitter, radio frequency receiver, radio frequency transmitting coil, radio frequency receiving coil, its characterized in that still includes: the radio frequency transmitter comprises a first power divider, a second power divider, a first pickup coil and a second pickup coil which are arranged on two sides of a radio frequency transmitting coil, and a third pickup coil and a fourth pickup coil which are arranged on two sides of a radio frequency receiving coil; the first power divider is connected with the radio frequency transmitter and the radio frequency transmitting coil; the second power divider is connected with the radio frequency transmitter, the third pick-up coil and the fourth pick-up coil; the first pickup coil and the second pickup coil are connected with the radio frequency receiver; the radio frequency receiving coil is connected with the radio frequency receiver.
Description
Technical Field
The present application relates to the field of magnetic resonance technology, and in particular, to a magnetic resonance spectrometer and a magnetic resonance imaging system.
Background
Magnetic Resonance Imaging (MRI) systems are modern medical Imaging devices that generate Resonance phenomena by radio frequency field excitation, and perform visual Imaging on tissues and structures of a human body.
The radio frequency coil (such as a radio frequency transmitting coil, a radio frequency receiving coil and a transmitting-receiving integrated radio frequency coil) in the magnetic resonance imaging system is a key component influencing the image quality, the working central frequency of the radio frequency coil needs to be consistent with the central frequency of magnetic resonance, and the bandwidth needs to reach the bandwidth required by a field of view (FOV), so that the measurement of the performance index of the radio frequency coil is very complex and important work, and the performance indexes such as the passband bandwidth, the resonant frequency, the in-band flatness and the like of the radio frequency coil need to be checked regularly.
At present, a network analyzer is generally used for measuring performance indexes of a radio frequency coil, but the network analyzer is expensive, inconvenient to carry and easy to damage after being transported for a long time. Therefore, how to detect the performance index of the radio frequency coil without depending on a network analyzer is an urgent requirement of each magnetic resonance manufacturer.
Disclosure of Invention
In view of this, the present application provides a magnetic resonance spectrometer and a magnetic resonance imaging system, so as to implement the self-detection of the performance index of the radio frequency coil by the magnetic resonance imaging system.
In a first aspect, an embodiment of the present application provides a magnetic resonance spectrometer, including: radio frequency transmitter, radio frequency receiver, radio frequency transmitting coil, radio frequency receiving coil, its characterized in that still includes: the radio frequency transmitter comprises a first power divider, a second power divider, a first pickup coil and a second pickup coil which are arranged on two sides of a radio frequency transmitting coil, and a third pickup coil and a fourth pickup coil which are arranged on two sides of a radio frequency receiving coil; wherein the content of the first and second substances,
the first power divider is connected with the radio frequency transmitter and the radio frequency transmitting coil;
the second power divider is connected with the radio frequency transmitter, the third pick-up coil and the fourth pick-up coil;
the first pickup coil and the second pickup coil are connected with the radio frequency receiver;
the radio frequency receiving coil is connected with the radio frequency receiver.
The magnetic resonance spectrometer is provided with the first power divider connected with the radio frequency transmitter and the radio frequency transmitting coil, and the first pickup coil and the second pickup coil which are arranged on two sides of the radio frequency transmitting coil and connected with the radio frequency receiver so as to form a loop, so that the performance index of the radio frequency transmitting coil can be analyzed according to the signal received by the radio frequency receiver in a transmitting and detecting mode; meanwhile, a third pickup coil and a fourth pickup coil which are arranged on two sides of the radio frequency receiving coil, a second power divider which is connected with the radio frequency transmitter, the third pickup coil and the fourth pickup coil, and the radio frequency receiving coil and the radio frequency receiver are connected to form a loop, so that the performance index of the radio frequency receiving coil can be analyzed according to the signal received by the radio frequency receiver in a receiving and detecting mode; therefore, the magnetic resonance spectrometer is used for a magnetic resonance imaging system, and the self detection of the performance index of the radio frequency coil by the magnetic resonance imaging system can be realized.
In a possible implementation manner, the radio frequency transmitting coil and the radio frequency receiving coil are integrally arranged, the first pickup coil and the third pickup coil are integrally arranged, and the second pickup coil and the fourth pickup coil are integrally arranged.
In the magnetic resonance spectrometer, because the radio frequency transmitting coil and the radio frequency receiving coil are integrally arranged, the first pickup coil and the third pickup coil are integrally arranged, and the second pickup coil and the fourth pickup coil are integrally arranged, components can be reduced, and the cost can be saved.
In a possible implementation manner, the method further includes: a radio frequency amplifier; the radio frequency amplifier is connected with the radio frequency transmitter and the first power divider.
In the magnetic resonance spectrometer, because the radio frequency amplifier is connected between the radio frequency transmitter and the first power divider, a test signal transmitted by the radio frequency transmitter can be amplified and then output to the first power divider, so that the signal-to-noise ratio can be improved, and the measurement of the performance index of the radio frequency transmitting coil is facilitated.
In a possible implementation manner, the method further includes: a third power divider; the third power divider is connected with the radio frequency receiver, the first pickup coil and the second pickup coil.
In the magnetic resonance spectrometer, the third power divider connected with the radio frequency receiver, the first pickup coil and the second pickup coil is arranged, so that signals respectively output by the first pickup coil and the second pickup coil can be combined into one signal and then output to the radio frequency receiver, and thus, the circuit can be simplified.
In a possible implementation manner, the method further includes: a first low noise amplifier; the first low noise amplifier is connected with the radio frequency receiver and the third power divider.
In the magnetic resonance spectrometer, the first low-noise amplifier is connected between the third power divider and the radio frequency receiver, so that the synthesized radio frequency receiving signal can be denoised and amplified and then output to the radio frequency receiver, the signal-to-noise ratio can be improved, and the measurement of the performance index of the radio frequency transmitting coil is facilitated.
In a possible implementation manner, the second power divider and the third power divider are integrally disposed.
In the magnetic resonance spectrometer, the second power divider and the third power divider are integrally arranged, so that components can be reduced, and the cost can be saved.
In a possible implementation manner, the method further includes: a fourth power divider; and the fourth power divider is connected with the radio frequency receiver and the radio frequency receiving coil.
In the magnetic resonance spectrometer, the fourth power divider connected with the radio frequency receiver and the radio frequency receiving coil is arranged, so that an I signal and a Q signal output by the radio frequency receiving coil can be synthesized into a signal and then output to the radio frequency receiver, and the circuit can be simplified.
In a possible implementation manner, the method further includes: a second low noise amplifier; the second low noise amplifier is connected with the radio frequency receiver and the fourth power divider.
In the magnetic resonance spectrometer, because the second low-noise amplifier is connected between the fourth power divider and the radio frequency receiver, the synthesized radio frequency receiving signal can be denoised and amplified, so that the signal-to-noise ratio can be improved, and the measurement of the performance index of the radio frequency receiving coil is facilitated.
In a possible implementation manner, the first power divider and the fourth power divider are integrally disposed.
In the magnetic resonance spectrometer, the first power divider and the fourth power divider are integrally arranged, so that components can be reduced, and the cost can be saved.
In one possible implementation, the magnetic resonance spectrometer further includes: a first radio frequency switch and a second radio frequency switch;
a first end of the first radio frequency switch is connected with a first output end of the first power divider, a second end of the first radio frequency switch is connected with a first connecting end of the receiving-transmitting integrated radio frequency coil, and a third end of the first radio frequency switch is connected with a first input end of the radio frequency receiver;
the first end of the second radio frequency switch is connected with the second output end of the first power divider, the second end of the second radio frequency switch is connected with the second connecting end of the receiving-transmitting integrated radio frequency coil, and the third end of the second radio frequency switch is connected with the second input end of the radio frequency receiver.
In the magnetic resonance spectrometer, the first power divider can output an I signal to the radio-frequency coil integrated with transceiving when in a transmitting performance detection mode by arranging the first radio-frequency switch, the I signal and the I signal output to the radio-frequency receiver by the radio-frequency coil integrated with transceiving when in a receiving performance detection mode can use a section of the same loop, and the first power divider can output a Q signal to the radio-frequency coil integrated with transceiving when in the transmitting performance detection mode by arranging the second radio-frequency switch, and the Q signal output to the radio-frequency receiver by the radio-frequency coil integrated with transceiving when in the receiving performance detection mode can use a section of the same loop. Therefore, the wiring can be simplified.
In one possible implementation, the magnetic resonance spectrometer further includes: a third low noise amplifier and a fourth low noise amplifier;
the third low noise amplifier is connected with the first input end of the radio frequency receiver and the third end of the first radio frequency switch;
the fourth low noise amplifier is connected with the second input end of the radio frequency receiver and the third end of the second radio frequency switch.
In the magnetic resonance spectrometer, because the third low-noise amplifier is connected between the first input end of the radio frequency receiver and the third end of the first radio frequency switch, the signal output by the first radio frequency switch can be denoised and amplified and then output to the radio frequency receiver, and the fourth low-noise amplifier is connected between the second input end of the radio frequency receiver and the third end of the second radio frequency switch, the signal output by the second radio frequency switch can be denoised and amplified and then output to the radio frequency receiver. Therefore, the signal-to-noise ratio can be improved, and the measurement of the performance index when the radio-frequency coil integrated with the transceiver receives the radio-frequency coil is facilitated.
In a second aspect, an embodiment of the present application further provides a magnetic resonance imaging system, including: a reconstruction computer and a magnetic resonance spectrometer as provided in any of the embodiments of the present application;
the reconstruction computer is connected with a radio frequency receiver of the magnetic resonance spectrometer;
when in a transmission performance detection mode, a first power divider divides a test signal transmitted by a radio frequency transmitter into a real part I signal and an imaginary part Q signal and outputs the signals to a radio frequency transmitting coil; the first pick-up coil outputs an I signal sent by the radio frequency transmitting coil to a radio frequency receiver when receiving the I signal, and the second pick-up coil outputs a Q signal sent by the radio frequency transmitting coil to the radio frequency receiver when receiving the Q signal; the radio frequency receiver performs analog-to-digital conversion and digital demodulation on the received signal and outputs the signal to the reconstruction computer; the reconstruction computer determines a performance index of the radio frequency transmitting coil according to the received signal;
in a reception performance detection mode, the second power divider divides a test signal transmitted by the radio frequency transmitter into an I signal and a Q signal, and outputs the I signal to the third pickup coil and the Q signal to the fourth pickup coil; the third pick-up coil transmits the I signal for reception by the radio frequency receive coil, and the fourth pick-up coil transmits the Q signal for reception by the radio frequency receive coil; outputting the I signal and the Q signal to the radio frequency receiver when the radio frequency receiving coil receives the I signal and the Q signal; the radio frequency receiver performs analog-to-digital conversion and digital demodulation on the received signal and outputs the signal to the reconstruction computer; the reconstruction computer determines a performance index of the radio frequency receive coil from the received signal.
In the magnetic resonance imaging system, in a transmission performance detection mode, a test signal transmitted by a radio frequency transmitter is divided into an I signal and a Q signal by a first power divider and is output to a radio frequency transmitting coil, then the I signal transmitted by the radio frequency transmitting coil is received by a first pickup coil and is output to a radio frequency receiver, the Q signal transmitted by the radio frequency transmitting coil is received by a second pickup coil and is output to the radio frequency receiver, the received signal is subjected to analog-to-digital conversion and digital demodulation by the radio frequency receiver and is output to a reconstruction computer, and then the reconstruction computer determines performance indexes (such as performance indexes of passband bandwidth, resonant frequency, in-band flatness and the like) of the radio frequency transmitting coil according to the received signal; and when in a receiving performance detection mode, dividing a test signal transmitted by the radio frequency transmitter into an I signal and a Q signal through the second power divider, outputting the I signal to the first pickup coil, outputting the Q signal to the second pickup coil, transmitting the I signal and the Q signal received from the second power divider by the first pickup coil and the second pickup coil respectively so as to be received by the radio frequency receiving coil and output to the radio frequency receiver, performing analog-to-digital conversion and digital demodulation on the received signal by the radio frequency receiver and outputting to a reconstruction computer, and determining a performance index of the radio frequency receiving coil by the reconstruction computer according to the received signal. Therefore, the performance index of the magnetic resonance imaging system for self-detecting the radio frequency coil can be realized.
Drawings
FIG. 1 is a schematic structural diagram of a magnetic resonance spectrometer according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of another magnetic resonance spectrometer according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a magnetic resonance spectrometer according to a second embodiment of the present application;
FIG. 4 is a schematic structural diagram of a magnetic resonance spectrometer according to a second embodiment of the present application;
fig. 5 is a schematic structural diagram of a magnetic resonance imaging system according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
The first embodiment is as follows:
referring to fig. 1 and fig. 2, a magnetic resonance spectrometer according to an embodiment of the present application includes: a radio frequency transmitter 11(RF transmitter), a radio frequency receiver 12(RF receiver), a radio frequency transmitting coil 13, a radio frequency receiving coil 14, and further comprising: a first power splitter (hybrid)15, a second power splitter 16, a first pickup coil 17(PU _ a) and a second pickup coil 18(PU _ B) disposed on both sides of the radio frequency transmitting coil 13, and a third pickup coil 19(PU _ C) and a fourth pickup coil 20(PU _ D) disposed on both sides of the radio frequency receiving coil 14.
The first power divider 15 is connected with the radio frequency transmitter 11 and the radio frequency transmitting coil 13; the first power divider 14 is configured to divide a test signal (TTX) transmitted by the radio frequency transmitter 11 into an I signal and a Q signal, and output the I signal and the Q signal to the radio frequency transmitting coil 13;
the test signal may be a sine wave signal, for example.
The radio frequency transmission coil 13 is only operable if the frequency of the test signal is within the passband of the radio frequency transmission coil 13, i.e. the radio frequency transmission coil 13 can transmit a signal.
The first pickup coil 17 and the second pickup coil 18 are connected with the radio frequency receiver 12; the first pick-up coil 17 is used for receiving the I signal sent by the radio frequency transmitting coil 13 and outputting the I signal to the radio frequency receiver 12; the second pickup coil 18 is used for receiving the Q signal sent by the radio frequency transmitting coil 13 and outputting the Q signal to the radio frequency receiver 12;
the second power divider 16 is connected to the radio frequency transmitter 12, the third pickup coil 19 and the fourth pickup coil 20; the radio frequency receiving coil 14 is connected with the radio frequency receiver 12;
the second power divider 16 is configured to divide the test signal transmitted from the radio frequency transmitter 11 into an I signal and a Q signal, and output the I signal to the third pickup coil 19 and the Q signal to the fourth pickup coil 20;
the third pick-up coil 19 is used for transmitting the I signal received from the second power divider 16 for the radio frequency receiving coil 14 to receive and output to the radio frequency receiver 12;
the fourth pick-up coil 20 is used for transmitting the Q signal received from the second power divider 16 for the rf receiving coil 14 to receive and output to the rf receiver 12.
It should be noted that the radio frequency receiving coil 14 can only operate when the frequencies of the I signal transmitted by the third pickup coil 19 and the Q signal transmitted by the fourth pickup coil 20 are within the pass band frequency of the radio frequency receiving coil 14, i.e., the radio frequency receiving coil 14 can receive the signals.
In the magnetic resonance spectrometer, the connection of the components may be direct connection or indirect connection, and the embodiment of the present application is not limited thereto.
In a possible implementation manner, as shown in fig. 1, the magnetic resonance spectrometer may further include: a radio frequency amplifier 21 (RFA); the rf amplifier 21 is connected to the rf transmitter 11 and the first power divider 15, and the rf amplifier 21 is used for amplifying a signal.
In the magnetic resonance spectrometer, a test signal transmitted by a radio frequency transmitter 11 is amplified by a radio frequency amplifier 21 and then output to a first power divider 15, so that the signal-to-noise ratio can be improved, and the measurement of the performance index of a radio frequency transmitting coil 13 is facilitated.
In a possible implementation manner, as shown in fig. 1, the magnetic resonance spectrometer may further include: a third power divider 22(hybrid), the third power divider 22 being connected to the rf receiver 12, the first pickup coil 17 and the second pickup coil 18.
The third power divider 22 is configured to combine the I signal output by the first pickup coil 17 and the Q signal output by the second pickup coil 18 into a radio frequency receiving signal, and output the radio frequency receiving signal to the radio frequency receiver 12.
In one possible implementation, as shown in fig. 1, the magnetic resonance spectrometer may further include a first low noise amplifier 23 (L NA), where the first low noise amplifier 23 is connected to the rf receiver 12 and the third power divider 22.
In the magnetic resonance spectrometer, the radio frequency receiving signal synthesized by the third power divider 22 is denoised and amplified by the first low noise amplifier 23 and then output to the radio frequency receiver 12, so that the signal-to-noise ratio can be improved, and the measurement of the performance index of the radio frequency transmitting coil 13 is facilitated.
It should be noted that the I signal output by the first pickup coil 17 may also be transmitted to the radio frequency receiver 12 through a low noise amplifier, and the Q signal output by the second pickup coil 18 may also be transmitted to the radio frequency receiver 12 through a low noise amplifier, which is not limited in this embodiment of the application.
In a possible implementation manner, as shown in fig. 1, the magnetic resonance spectrometer may further include: a fourth power divider 24; the fourth power divider 24 is connected to the rf receiver 12 and the rf receive coil 14.
The fourth power divider 24 is configured to combine the I signal and the Q signal output by the rf receiving coil 14 into an rf receiving signal and output the rf receiving signal to the rf receiver 12.
In a possible implementation manner, as shown in fig. 1, the magnetic resonance spectrometer may further include: a second low noise amplifier 25; the second low noise amplifier 25 is connected to the rf receiver 12 and the fourth power divider 24.
In the magnetic resonance spectrometer, the radio frequency receiving signal synthesized by the fourth power divider 24 is denoised and amplified by the second low noise amplifier 25 and then output to the radio frequency receiver 12, so that the signal-to-noise ratio can be improved, and the measurement of the performance index of the radio frequency receiving coil 14 is facilitated.
In another possible implementation manner, as shown in fig. 2, the magnetic resonance spectrometer may further include: a third low noise amplifier 26 and a fourth low noise amplifier 27; a third low noise amplifier 26 is connected to the radio frequency receive coil 14 and the radio frequency receiver 12 and a fourth low noise amplifier 27 is connected to the radio frequency receive coil 14 and the radio frequency receiver 12.
The third low-noise amplifier 26 is configured to denoise and amplify the I signal output by the radio frequency receiving coil 14, and output the signal to the radio frequency receiver 12;
the fourth low noise amplifier 27 is configured to denoise and amplify the Q signal output by the radio frequency receiving coil 14, and output the amplified Q signal to the radio frequency receiver 12.
Example two:
the magnetic resonance spectrometer provided in the second embodiment of the present application is similar to the magnetic resonance spectrometer provided in the first embodiment of the present application, and the same parts are not described herein again, and only different parts are described below.
Referring to fig. 3 and 4, in the magnetic resonance spectrometer provided in the second embodiment of the present application, the radio frequency transmitting coil 13 and the radio frequency receiving coil 14 are integrally disposed, that is, the radio frequency coil in the magnetic resonance spectrometer is a radio frequency coil integrating transmission and reception, such as a quadrature body coil (QBC coil).
In one possible implementation, as shown in fig. 3 and 4, the first pickup coil 17 and the third pickup coil 19 may be integrally provided, and the second pickup coil 18 and the fourth pickup coil 20 may be integrally provided.
In a possible implementation manner, as shown in fig. 3 and 4, the second power divider 16 and the third power divider 22 may be integrally disposed.
The power divider has the function of the third power divider 22 (signal flow is shown by solid lines in fig. 3 and 4) in the transmission performance detection mode, and has the function of the second power divider 16 (signal flow is shown by dotted lines in fig. 3 and 4) in the reception performance detection mode.
In a possible implementation manner, as shown in fig. 3, the magnetic resonance spectrometer may further include: a first radio frequency switch 28 and a second radio frequency switch 29.
A first end of the first rf switch 28 is connected to the first output end of the first power divider 15, a second end is connected to the first connection end of the rf coil integrated with transceiver, and a third end is connected to the first input end of the rf receiver 12.
The first rf switch 28(RFSW1) is configured to transmit the I signal output by the first power divider 15 to the transceiver-integrated rf coil (signal flow is shown by a solid line in fig. 3) in the transmission performance detection mode, and transmit the I signal output by the transceiver-integrated rf coil to the rf receiver 12 (signal flow is shown by a dashed line in fig. 3) in the reception performance detection mode.
A first end of the second rf switch 29 is connected to the second output end of the first power divider 15, a second end is connected to the second connection end of the rf coil, and a third end is connected to the second input end of the rf receiver 12.
The second rf switch 29(RFSW2) is configured to transmit the Q signal output by the first power divider 15 to the transceiver-integrated rf coil (signal flow is shown by a solid line in fig. 3) in the transmission performance detection mode, and transmit the Q signal output by the transceiver-integrated rf coil to the rf receiver 12 (signal flow is shown by a dashed line in fig. 3) in the reception performance detection mode.
In a possible implementation, as shown in fig. 3, a third low noise amplifier 26 may be connected between the first input of the radio frequency receiver 12 and the third terminal of the first radio frequency switch 28, and a fourth low noise amplifier 27 may be connected between the second input of the radio frequency receiver 12 and the third terminal of the second radio frequency switch 29.
The third low noise amplifier 26 is configured to denoise and amplify the I signal output by the first radio frequency switch 28, and output the signal to the radio frequency receiver 12;
the fourth low noise amplifier 27 is configured to denoise and amplify the Q signal output by the second radio frequency switch 29, and output the amplified Q signal to the radio frequency receiver 12.
In another possible implementation manner, as shown in fig. 4, the first power divider 15 and the fourth power divider 24 may be integrally provided.
The power divider has the function of the first power divider 15 in the transmission performance detection mode (signal flow is shown by solid lines in fig. 4), and has the function of the fourth power divider 24 in the reception performance detection mode (signal flow is shown by dotted lines in fig. 4).
Based on the same inventive concept, referring to fig. 5, an embodiment of the present application further provides a magnetic resonance imaging system, including: a reconstruction computer 30 and a magnetic resonance spectrometer as provided in any of the embodiments herein (taking the magnetic resonance spectrometer shown in FIG. 1 as an example); the reconstruction computer 30 is connected to the radio frequency receiver 12 of the magnetic resonance spectrometer.
The working principle is as follows:
in the transmission performance detection mode, the first power divider 15 divides the test signal transmitted by the radio frequency transmitter 11 into a real part I signal and an imaginary part Q signal, and outputs the signals to the radio frequency transmitting coil 13; the first pickup coil 17 outputs the I signal sent by the radio frequency transmitting coil 13 to the radio frequency receiver 12 when receiving the I signal, and the second pickup coil 18 outputs the Q signal sent by the radio frequency transmitting coil 13 to the radio frequency receiver 12 when receiving the Q signal; the radio frequency receiver 12 performs analog-to-digital conversion and digital demodulation on the received signal and outputs the signal to the reconstruction computer 30; the reconstruction computer 30 determines the performance index of the radio frequency transmission coil 13 according to the received signal;
in the reception performance detection mode, the second power divider 16 divides the test signal transmitted from the radio frequency transmitter 11 into an I signal and a Q signal, and outputs the I signal to the third pickup coil 19 and the Q signal to the fourth pickup coil 20; the third pick-up coil 19 transmits an I signal for reception by the radio frequency receive coil 14, and the fourth pick-up coil 20 transmits a Q signal for reception by the radio frequency receive coil 14; outputting the I signal and the Q signal to the radio frequency receiver 12 when the radio frequency receiving coil 14 receives them; the radio frequency receiver 12 performs analog-to-digital conversion and digital demodulation on the received signal and outputs the signal to the reconstruction computer 30; the reconstruction computer 30 determines a performance index for the radio frequency receive coil 14 from the received signals.
It is noted that in the magnetic resonance imaging system described above, the frequency of the test signal emitted by the radio frequency transmitter 11 may be controlled by the reconstruction computer 30, for example.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (12)
1. A magnetic resonance spectrometer comprising: radio frequency transmitter, radio frequency receiver, radio frequency transmitting coil, radio frequency receiving coil, its characterized in that still includes: the radio frequency transmitter comprises a first power divider, a second power divider, a first pickup coil and a second pickup coil which are arranged on two sides of a radio frequency transmitting coil, and a third pickup coil and a fourth pickup coil which are arranged on two sides of a radio frequency receiving coil; wherein the content of the first and second substances,
the first power divider is connected with the radio frequency transmitter and the radio frequency transmitting coil;
the second power divider is connected with the radio frequency transmitter, the third pick-up coil and the fourth pick-up coil;
the first pickup coil and the second pickup coil are connected with the radio frequency receiver;
the radio frequency receiving coil is connected with the radio frequency receiver.
2. The magnetic resonance spectrometer of claim 1, wherein the radio frequency transmit coil and the radio frequency receive coil are integrally disposed to form a transmit-receive integral radio frequency coil; the first pickup coil and the third pickup coil are integrally provided, and the second pickup coil and the fourth pickup coil are integrally provided.
3. The magnetic resonance spectrometer of claim 1, further comprising: a radio frequency amplifier; the radio frequency amplifier is connected with the radio frequency transmitter and the first power divider.
4. The magnetic resonance spectrometer of claim 1 or 2, further comprising: a third power divider; the third power divider is connected with the radio frequency receiver, the first pickup coil and the second pickup coil.
5. The magnetic resonance spectrometer of claim 4, further comprising: a first low noise amplifier; the first low noise amplifier is connected with the radio frequency receiver and the third power divider.
6. The magnetic resonance spectrometer of claim 4, wherein the second power divider and the third power divider are integrally disposed.
7. The magnetic resonance spectrometer of claim 1 or 2, further comprising: a fourth power divider; and the fourth power divider is connected with the radio frequency receiver and the radio frequency receiving coil.
8. The magnetic resonance spectrometer of claim 7, further comprising: a second low noise amplifier; the second low noise amplifier is connected with the radio frequency receiver and the fourth power divider.
9. The magnetic resonance spectrometer of claim 7, wherein the first power divider and the fourth power divider are integrally disposed.
10. The magnetic resonance spectrometer of claim 2, further comprising: a first radio frequency switch and a second radio frequency switch;
a first end of the first radio frequency switch is connected with a first output end of the first power divider, a second end of the first radio frequency switch is connected with a first connecting end of the receiving-transmitting integrated radio frequency coil, and a third end of the first radio frequency switch is connected with a first input end of the radio frequency receiver;
the first end of the second radio frequency switch is connected with the second output end of the first power divider, the second end of the second radio frequency switch is connected with the second connecting end of the receiving-transmitting integrated radio frequency coil, and the third end of the second radio frequency switch is connected with the second input end of the radio frequency receiver.
11. The magnetic resonance spectrometer of claim 10, further comprising: a third low noise amplifier and a fourth low noise amplifier;
the third low noise amplifier is connected with the first input end of the radio frequency receiver and the third end of the first radio frequency switch;
the fourth low noise amplifier is connected with the second input end of the radio frequency receiver and the third end of the second radio frequency switch.
12. A magnetic resonance imaging system, comprising: a reconstruction computer and a magnetic resonance spectrometer as claimed in any of claims 1-11;
the reconstruction computer is connected with a radio frequency receiver of the magnetic resonance spectrometer;
when in a transmission performance detection mode, a first power divider divides a test signal transmitted by a radio frequency transmitter into a real part I signal and an imaginary part Q signal and outputs the signals to a radio frequency transmitting coil; the first pick-up coil outputs an I signal sent by the radio frequency transmitting coil to a radio frequency receiver when receiving the I signal, and the second pick-up coil outputs a Q signal sent by the radio frequency transmitting coil to the radio frequency receiver when receiving the Q signal; the radio frequency receiver performs analog-to-digital conversion and digital demodulation on the received signal and outputs the signal to the reconstruction computer; the reconstruction computer determines a performance index of the radio frequency transmitting coil according to the received signal;
in a reception performance detection mode, the second power divider divides a test signal transmitted by the radio frequency transmitter into an I signal and a Q signal, and outputs the I signal to the third pickup coil and the Q signal to the fourth pickup coil; the third pick-up coil transmits the I signal for reception by the radio frequency receive coil, and the fourth pick-up coil transmits the Q signal for reception by the radio frequency receive coil; outputting the I signal and the Q signal to the radio frequency receiver when the radio frequency receiving coil receives the I signal and the Q signal; the radio frequency receiver performs analog-to-digital conversion and digital demodulation on the received signal and outputs the signal to the reconstruction computer; the reconstruction computer determines a performance index of the radio frequency receive coil from the received signal.
Priority Applications (1)
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| CN114236451B (en) * | 2021-11-29 | 2023-09-12 | 上海电气(集团)总公司智惠医疗装备分公司 | Testing method and device based on magnetic resonance spectrometer and electronic equipment |
| CN114415097B (en) * | 2021-12-31 | 2023-06-30 | 江苏美时医疗技术有限公司 | Magnetic resonance phased array coil performance rapid detection device and detection method thereof |
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