CN114114113A - Receiving coil and magnetic resonance imaging apparatus - Google Patents
Receiving coil and magnetic resonance imaging apparatus Download PDFInfo
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- CN114114113A CN114114113A CN202010895103.4A CN202010895103A CN114114113A CN 114114113 A CN114114113 A CN 114114113A CN 202010895103 A CN202010895103 A CN 202010895103A CN 114114113 A CN114114113 A CN 114114113A
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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
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
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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
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/389—Field stabilisation, e.g. by field measurements and control means or indirectly by current stabilisation
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The embodiment of the invention discloses a receiving coil and magnetic resonance equipment. Wherein the receiving coil includes: the energy coil is used for wirelessly receiving and processing energy and supplying power to the receiving coil by using the processed energy; the magnetic resonance coil is used for wirelessly receiving and processing the magnetic resonance signals and sending the processed magnetic resonance signals to the magnetic resonance system end through a wireless network; wherein the energy coil and the magnetic resonance coil are structurally independent of each other and are decoupled from each other in signal transmission and resonate at different frequencies. The technical scheme in the embodiment of the invention can realize wireless transmission of energy and magnetic resonance signals.
Description
Technical Field
The invention relates to the field of medical equipment, in particular to a receiving coil and magnetic resonance imaging equipment.
Background
In a Magnetic Resonance Imaging (MRI) system, the local coil is basically connected to the MRI system through a cable and a connector, i.e., the cable transmits a power supply (energy) and a tuning detuning control signal to an antenna at the system end, and simultaneously transmits a Magnetic resonance signal received by the antenna to a receiver at the system end.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a receiving coil on one hand and a magnetic resonance imaging apparatus on the other hand, so as to achieve wireless transmission of energy and magnetic resonance signals.
The receiving coil provided in the embodiment of the present invention includes: the energy coil is used for wirelessly receiving and processing energy and supplying power to the receiving coil by using the processed energy; the magnetic resonance coil is used for wirelessly receiving and processing the magnetic resonance signals and sending the processed magnetic resonance signals to the magnetic resonance system end through a wireless network; wherein the energy coil and the magnetic resonance coil are structurally independent of each other and are decoupled from each other in signal transmission and resonate at different frequencies.
In one embodiment, the energy coil is tuned at a first frequency and the energy coil suppresses the magnetic resonance signal by a filter that is passband at the first frequency and stopband at a second frequency; the magnetic resonance coil is tuned at a second frequency and the magnetic resonance coil rejects the energy signal by a filter that passes a band at the second frequency and that rejects a band at the first frequency.
In one embodiment, the energy coil comprises: the first coil body is used for receiving an energy signal with a first working frequency; a first filter connected in series to the first coil body, the first filter being a pass band at the first frequency and a stop band at a second frequency corresponding to a magnetic resonance signal, the first filter being configured to pass the energy signal and suppress interference from the magnetic resonance signal; a first tuning capacitor connected in series with the first coil body for resonating the first coil body at the first frequency; the rectifying circuit is used for converting the energy signal of the first frequency from alternating current to direct current; and the direct current voltage conversion module is used for performing voltage conversion on the direct current energy signal to obtain an output voltage matched with the power supply voltage of each module of the receiving coil.
In one embodiment, the energy coil further comprises: and the second filter is connected between the first coil main body and the rectifying circuit, is a pass band at the first frequency, and is a stop band at the second frequency, and is used for inhibiting interference signals from the rectifying circuit from being radiated back through the coil main body.
In one embodiment, the energy coil further comprises: and the third filter is connected to the output end of the direct-current voltage conversion module, and both the first frequency and the second frequency are stop bands and are used for removing ripples and stray waves output by the direct-current voltage conversion module.
In one embodiment, the magnetic resonance coil comprises: a second coil body for receiving a magnetic resonance signal of a second frequency; a second tuning capacitor connected in series to the second coil body for resonating the second coil body at a second frequency; a detuning circuit for detuning the second coil body during transmission of a system radio frequency pulse; the low-noise amplifier is used for amplifying the magnetic resonance signal; a fourth filter connected between the second coil body and the low noise amplifier, having a stop band at a first frequency and a pass band at a second frequency, for passing the magnetic resonance signal and suppressing an interference signal from a high power transmission and an energy coil feedback from entering the low noise amplifier; the input end of the band-pass filter is connected with the output end of the low-noise amplifier and is used for performing band-pass filtering on the amplified magnetic resonance signal; the input end of the analog-to-digital conversion module is connected with the output end of the band-pass filter and is used for performing analog-to-digital conversion on the magnetic resonance signal subjected to band-pass filtering; and the input end of the data transmission module is connected with the output end of the analog-to-digital conversion module and is used for encoding the magnetic resonance signals subjected to analog-to-digital conversion based on a wireless protocol and transmitting the encoded magnetic resonance signals to a magnetic resonance system end through a wireless antenna.
In one embodiment, the detuning circuit comprises: the first diode and the second diode are connected in parallel in the reverse direction on the second coil main body, the inductance is connected with the first diode and the second diode in series, and the capacitance is connected on the second coil main body in series and is connected with the first diode, the second diode and the inductance in parallel.
In one embodiment, the magnetic resonance coil further comprises: and a fifth filter connected in parallel with the first diode and the second diode, the fifth filter having a pass band at the first frequency and a stop band at the second frequency, and configured to prevent interference signals from high power transmission and feedback from the energy coil from generating interference on the first diode and the second diode.
An embodiment of the present invention provides a magnetic resonance imaging apparatus, including the receiving coil described in any of the above embodiments.
It can be seen from the above solution that, since the receiving coil in the embodiment of the present invention is provided with the magnetic resonance coil capable of wirelessly receiving and processing the magnetic resonance signal, and is added with the energy coil capable of wirelessly receiving and processing energy, and the energy coil and the magnetic resonance coil are set to be decoupled from each other in signal transmission and resonate at different frequencies, wireless transmission of the energy signal and the magnetic resonance signal without mutual interference is achieved.
The energy coil is tuned to a first frequency, the magnetic resonance coil is tuned to a second frequency, meanwhile, the energy coil is provided with a filter with a first frequency passband and a second frequency stopband, and the magnetic resonance coil is provided with a filter with a second frequency passband and a first frequency stopband, so that mutual decoupling of the energy coil and the magnetic resonance coil is realized.
Further, by further providing a pass band at the first frequency and a stop band filter at the second frequency between the first coil body of the energy coil and the rectifying circuit, the interference signal from the rectifying circuit can be inhibited from being radiated back out through the coil body.
In addition, the output end of the direct current voltage conversion module of the energy coil is provided with a stop band filter at the first frequency and the second frequency, so that ripples and stray waves output by the direct current voltage conversion module can be removed.
In addition, interference of interference signals from the energy coil on the detuning circuit can be prevented by providing the detuning circuit of the magnetic resonance coil with a filter.
Drawings
The foregoing and other features and advantages of the invention will become more apparent to those skilled in the art to which the invention relates upon consideration of the following detailed description of a preferred embodiment of the invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a receiving coil according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the structure of the energy coil in fig. 1.
Fig. 3 is a schematic diagram of the magnetic resonance coil of fig. 1.
Wherein the reference numbers are as follows:
Detailed Description
In the embodiment of the invention, the connector is oxidized after being plugged for a plurality of times for a long time, so that the connector needs to be cleaned and replaced regularly, and the maintenance cost of the system is increased; the cable often brings a bad experience to the customer, and especially for the flexible abdominal coil, the cable is a burden to press on the body of the patient. Therefore, it is considered to provide a wireless coil, which can greatly improve user experience because it does not need to transmit energy and magnetic resonance signal data through a connector and a cable, and can reduce system maintenance cost because there is no cable that needs to be plugged and unplugged for many times for a long time.
The wireless energy transmission is realized by the transmitting coil and the receiving coil through inductive coupling, but the inductive coupling energy transmission efficiency is low, and the transmitting coil needs large power to meet the energy required by the receiving coil, so that the wireless energy transmission has high-power transmission. The wireless energy transmission is independent from the radio frequency pulse transmission of the system, and exists in the whole scanning process, including a radio frequency pulse transmission phase and a magnetic resonance signal acquisition phase, and in the magnetic resonance signal acquisition phase, a receiving coil is exposed to a high-power transmission field for energy transmission, so that the transmission signal for energy transmission needs to be restrained from entering the magnetic resonance coil and finally entering a receiver so as to prevent noise from being generated on an image.
To this end, in an embodiment of the present invention, a receiving coil capable of achieving wireless energy and wireless data transmission and capable of suppressing high-power transmission into a receiver is provided, where the receiving coil includes a receiving sub-coil (energy coil for short) for wirelessly receiving and processing energy, and a receiving sub-coil (magnetic resonance coil for short) for wirelessly receiving and processing a magnetic resonance signal. The energy coil and the magnetic resonance coil are geometrically independent of each other and are decoupled from each other in signal transmission and resonate at different frequencies. In order to make the two resonate at different frequencies, the filter with different frequency pass bands and stop bands is arranged for the two coils in the embodiment of the invention. For example, the energy coil is tuned to a first frequency and a filter in the energy coil is provided in a pass band at the first frequency and a stop band at a second frequency to suppress magnetic resonance signals; while the magnetic resonance coil is tuned at a second frequency and a filter in a pass band at the second frequency and a stop band at the first frequency is provided in the magnetic resonance coil to suppress the energy signal.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by referring to the following examples.
Fig. 1 is a schematic structural diagram of a receiving coil according to an embodiment of the present invention. Fig. 2 is a schematic diagram of the structure of the energy coil in fig. 1. Fig. 3 is a schematic diagram of the magnetic resonance coil of fig. 1.
As shown in fig. 1, the receiving coil in the embodiment of the present invention includes an energy coil 1 and a magnetic resonance coil 2.
The energy coil 1 is used for wirelessly receiving and processing energy, and supplying power to the receiving coil by using the processed energy. In a specific implementation, the energy coil 1 may include, as shown in fig. 2: the transformer comprises a first coil body 11, a first tuning capacitor C1, a first filter F1, a second filter F2, a rectifying circuit (rectifying) 12, a direct current voltage conversion module (DCDC)13 and a third filter F3.
The first coil body 11 is configured to receive an energy signal with a first frequency f 1.
A first filter F1 is loaded (i.e. in series as shown in fig. 2, the same below) on the first coil body 11, which is a pass band at said first frequency F1 and a stop band at a corresponding second frequency F2 of the magnetic resonance signal for passing said energy signal and suppressing interference from the magnetic resonance signal.
A first tuning capacitor C1 is loaded on the first coil body 11 for resonating the first coil body 11 at the first frequency f 1.
The rectifying circuit 12 is used for converting the energy signal received by the first coil body 11 from alternating current to direct current.
The second filter F2 is applied to the port of the first coil body 11, is located between the first coil body 11 and the rectifier circuit 12, has a pass band at the first frequency F1, and has a stop band at the second frequency F2, and is used for passing the energy signal and suppressing the interference signals such as the switching frequency and the higher harmonics from the rectifier circuit 12 from being radiated back through the coil body 11. Of course, in other embodiments, the second filter F2 may be replaced by other devices or omitted.
The first tuning capacitor C1 loaded on the first coil body 11 and the second filter F2 loaded on the port of the first coil body 11 make the coil body 11 look like an LC circuit series-resonant at the first frequency F1 from its port.
The input end of the dc voltage conversion module 13 is connected to the output end of the rectifying circuit 12, and is configured to perform voltage conversion on the dc energy signal from the rectifying circuit 12 to obtain an energy voltage adapted to the supply voltage of each module of the receiving coil.
The third filter F3 is connected to the output end of the dc voltage converting module 13, and both the first frequency F1 and the second frequency F2 are stop bands, so as to remove ripples and stray waves output by the dc voltage converting module 13 and suppress the influence of the magnetic resonance signal on the dc. Of course, in some embodiments, the third filter F3 may be replaced by other devices or omitted.
The magnetic resonance coil 2 is used for wirelessly receiving and processing the magnetic resonance signals and sending the processed magnetic resonance signals to the magnetic resonance system end through a wireless network. In a specific implementation, the magnetic resonance coil 2 may include, as shown in fig. 3: a second coil body 21, second tuning capacitors C2-C5, a detuning circuit 22, a fourth filter F4, a fifth filter F5, a low noise amplifier LNA, a band pass filter BPF, an analog-to-digital conversion (ADC) module 23 and a data transmission module 24.
Wherein the second coil body 21 is adapted to receive a magnetic resonance signal of a second frequency f 2.
A second tuning capacitance C2-C5 is loaded on the second coil body 21 for resonating the second coil body 21 at the second frequency f 2. That is, when the coil receives a magnetic resonance signal, all capacitances connected in series to the second coil body 21 participate in the tuning, the second coil body 21 being operated at the second frequency f 2.
The detuning circuit 22 is used to detune the second coil body 21 during transmission of the system radio frequency pulses. In particular, the detuning circuit 22 may be implemented in various ways. One specific implementation of which is shown in fig. 2, includes: a first diode D1 and a second diode D2 connected in anti-parallel on the second coil body 21, an inductance L1 connected in series with the first diode D1 and the second diode D2, and capacitances C4 and C5 connected in series on the second coil body 21 and in parallel with the series circuit of the first diode D1, the second diode D2 and the inductance L1. Wherein the capacitors C4 and C5 and the inductor L1 resonate at the second frequency f 2. It can be seen that in the case of large transmitting power, the first diode D1 and the second diode D2 will operate simultaneously, which can be regarded as a short circuit, and the fifth filter F5 will ensure that the current flowing through the diodes will not exceed the limit, in this case, the capacitors C4 and C5 are in a detuned state, in other words, the capacitors C4 and C5 are short-circuited, and the coil body 21 will no longer operate, so as to prevent the coil device from being damaged by the large power.
The low noise amplifier LNA is configured to amplify the magnetic resonance signal received by the second coil body 21.
The fourth filter F4 is connected between the second coil body 21 and the low noise amplifier LNA, and has a stop band at the first frequency F1 and a pass band at the second frequency F2 for passing the magnetic resonance signal received by the second coil body 21 and suppressing an interference signal from a high power transmission and an energy coil feedback from entering the low noise amplifier LNA.
The fifth filter F5 is connected in parallel to the detuning circuit, specifically to the first diode D1 and the second diode D2 in the detuning circuit shown in fig. 2, which is a pass band at the first frequency F1 and a stop band at the second frequency F2, for preventing interference signals from high power transmission and energy coil feedback from generating interference on the first diode D1 and the second diode D2.
The input end of the band-pass filter BPF is connected to the output end of the low noise amplifier LNA, and the output end is connected to the input end of the analog-to-digital conversion module 23, so as to perform band-pass filtering on the magnetic resonance signal amplified by the low noise amplifier LNA.
The output end of the analog-to-digital conversion module 23 is connected to the data transmission module 24, and is configured to perform analog-to-digital conversion on the magnetic resonance signal filtered by the band-pass filter BPF.
The data transmission module 24 is configured to encode the magnetic resonance signal after analog-to-digital conversion based on a wireless protocol, and transmit the encoded magnetic resonance signal to a magnetic resonance system through a wireless antenna.
In an embodiment of the present invention, a magnetic resonance imaging apparatus is further provided, which includes the receiving coil described in any of the above embodiments.
It can be seen from the above solution that, since the receiving coil in the embodiment of the present invention is provided with the magnetic resonance coil capable of wirelessly receiving and processing the magnetic resonance signal, and is added with the energy coil capable of wirelessly receiving and processing energy, and the energy coil and the magnetic resonance coil are set to be decoupled from each other in signal transmission and resonate at different frequencies, wireless transmission of the energy signal and the magnetic resonance signal without mutual interference is achieved.
The energy coil is tuned to a first frequency, the magnetic resonance coil is tuned to a second frequency, meanwhile, the energy coil is provided with a filter with a first frequency passband and a second frequency stopband, and the magnetic resonance coil is provided with a filter with a second frequency passband and a first frequency stopband, so that mutual decoupling of the energy coil and the magnetic resonance coil is realized.
Further, by further providing a pass band at the first frequency and a stop band filter at the second frequency between the first coil body of the energy coil and the rectifying circuit, the interference signal from the rectifying circuit can be inhibited from being radiated back out through the coil body.
In addition, the output end of the direct current voltage conversion module of the energy coil is provided with a stop band filter at the first frequency and the second frequency, so that ripples and stray waves output by the direct current voltage conversion module can be removed.
In addition, interference of interference signals from the energy coil on the detuning circuit can be prevented by providing the detuning circuit of the magnetic resonance coil with a filter.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A receive coil, comprising:
the energy coil (1) is used for wirelessly receiving and processing energy and supplying power to the receiving coil by using the processed energy; and
the magnetic resonance coil (2) is used for wirelessly receiving and processing the magnetic resonance signals and sending the processed magnetic resonance signals to a magnetic resonance system end through a wireless network;
wherein the energy coil (1) and the magnetic resonance coil (2) are structurally independent of one another and are decoupled from one another in terms of signal transmission and resonate at different frequencies.
2. The receive coil as claimed in claim 1, characterized in that the energy coil (1) is tuned at a first frequency and the energy coil (1) suppresses magnetic resonance signals by a filter in a pass band at the first frequency and in a stop band at a second frequency;
the magnetic resonance coil (2) is tuned at a second frequency, and the magnetic resonance coil (2) suppresses the energy signal by a filter at a passband of the second frequency, at a stopband of the first frequency.
3. The receiving coil as claimed in claim 2, characterized in that the energy coil (1) comprises:
the first coil body (11) is used for receiving an energy signal with a first working frequency;
a first filter (F1) connected in series to the first coil body (11), the first filter being a pass band at the first frequency and a stop band at a second frequency corresponding to a magnetic resonance signal, the first filter being configured to pass the energy signal and suppress interference from the magnetic resonance signal;
a first tuning capacitor (C1) connected in series with the first coil body (11) for resonating the first coil body (11) at the first frequency;
a rectifying circuit (12) for converting the energy signal of the first frequency from alternating current to direct current;
and the direct current voltage conversion module (13) is used for performing voltage conversion on the direct current energy signal to obtain an output voltage matched with the power supply voltage of each module of the receiving coil.
4. The receiving coil as claimed in claim 3, characterized in that the energy coil (1) further comprises:
and a second filter (F2) connected between the first coil body (11) and the rectifier circuit (12), having a pass band at the first frequency and a stop band at the second frequency, for suppressing an interference signal from the rectifier circuit (12) from being radiated back through the coil body (11).
5. The receive coil of claim 3, wherein the energy coil further comprises:
and the third filter (F3) is connected to the output end of the direct current voltage conversion module (13), and is used for removing ripples and stray waves output by the direct current voltage conversion module (13) in the stop band at the first frequency and the second frequency.
6. The receive coil as claimed in any of claims 2 to 4, characterized in that the magnetic resonance coil (2) comprises:
a second coil body (21) for receiving magnetic resonance signals at a second frequency;
a second tuning capacitance (C2-C5) connected in series on the second coil body (21) for resonating the second coil body (21) at a second frequency;
a detuning circuit (22) for detuning the second coil body (21) during transmission of a system radio frequency pulse;
a Low Noise Amplifier (LNA) for amplifying the magnetic resonance signal;
a fourth filter (F4) connected between the second coil body (21) and the Low Noise Amplifier (LNA), which is a stop band at a first frequency and a pass band at a second frequency, for passing the magnetic resonance signal and suppressing interference signals from high power transmission and energy coil feedback from entering the Low Noise Amplifier (LNA);
a band-pass filter (BPF) having an input connected to an output of the Low Noise Amplifier (LNA) and configured to perform band-pass filtering on the amplified magnetic resonance signal;
the input end of the analog-to-digital conversion module (23) is connected with the output end of the band-pass filter (BPF) and is used for performing analog-to-digital conversion on the magnetic resonance signal subjected to band-pass filtering;
and the input end of the data transmission module (24) is connected with the output end of the analog-to-digital conversion module (23), and is used for encoding the magnetic resonance signals subjected to analog-to-digital conversion based on a wireless protocol and transmitting the encoded magnetic resonance signals to a magnetic resonance system end through a wireless antenna.
7. The receive coil as set forth in claim 6, wherein the detuning circuit (22) includes: a first diode (D1) and a second diode (D2) connected in anti-parallel on the second coil body, an inductance (L1) connected in series with the first diode (D1) and the second diode (D2), and a capacitance (C4, C5) connected in series on the second coil body (21) and connected in parallel with the first diode (D1), the second diode (D2) and the inductance (L1).
8. The receive coil as set forth in claim 7, wherein the magnetic resonance coil (2) further includes:
a fifth filter (F5) connected in parallel with the first diode (D1) and the second diode (D2) and having a pass band at the first frequency and a stop band at the second frequency for preventing interference signals from high power emissions and energy coil feedback from generating interference on the first diode (D1) and the second diode (D2).
9. A magnetic resonance imaging apparatus, characterized in that it comprises a receive coil as claimed in any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010895103.4A CN114114113A (en) | 2020-08-31 | 2020-08-31 | Receiving coil and magnetic resonance imaging apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010895103.4A CN114114113A (en) | 2020-08-31 | 2020-08-31 | Receiving coil and magnetic resonance imaging apparatus |
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