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EP-4343354-B1 - MAGNETIC RESONANCE SYSTEM AND CIRCUIT

EP4343354B1EP 4343354 B1EP4343354 B1EP 4343354B1EP-4343354-B1

Inventors

  • ZHANG, YUMAN
  • XU, Youlei
  • ZHOU, Jianfan
  • ZHAI, RENKUAN

Dates

Publication Date
20260506
Application Date
20221021

Claims (12)

  1. A magnetic resonance system, comprising: a magnetic resonance transmitter configured to generate one or more radio frequency signals; a magnetic resonance receiver configured to receive one or more magnetic resonance signals collected by one or more coils; and a magnetic resonance radio frequency power transceiver, including a communication circuit (10) and a control circuit (20), wherein the communication circuit (10) includes a first communication circuit (11) and a second communication circuit (12), the first communication circuit (11) is configured to transmit the one or more radio frequency signals to the one or more coils, and the second communication circuit (12) is configured to transmit the one or more magnetic resonance signals to the magnetic resonance receiver; and the control circuit (20) is configured to send one or more control signals to the communication circuit (10) to control the first communication circuit (11) or the second communication circuit (12) to turn on or cut off, wherein the control circuit (20) includes a power supply, the power supply is configured to output a turn-on signal and/or a cut-off signal to control the first communication circuit (11) and the second communication circuit (12) to turn on and/or cut off, the power supply includes a first direct current power supply (21) and a second direct current power supply (22), the first direct current power supply (21) is connected to the first communication circuit (11), the second direct current power supply (22) is connected to the second communication circuit (12), wherein the first communication circuit (11) includes a first diode (D1) and a second diode (D2), a negative electrode of the first diode (D1) is connected to the magnetic resonance transmitter, a positive electrode of the second diode (D2) is connected to a positive electrode of the first diode (D1), and a negative electrode of the second diode (D2) is connected to the one or more coils; the second communication circuit (12) includes a third diode (D3) and a fourth diode (D4), a negative electrode of the third diode (D3) is connected to the one or more coils, and a positive electrode of the fourth diode (D4) is connected to a positive electrode of the third diode (D3) and a negative electrode of the fourth diode (D4) is connected to the magnetic resonance receiver; the first direct current power supply (21) is connected to the positive electrode of the first diode (D1) and the positive electrode of the second diode (D2), the second direct current power supply (22) is connected to the positive electrode of the third diode (D3) and the positive electrode of the fourth diode (D4).
  2. The system of claim 1, wherein the one or more radio frequency signals are a plurality of radio frequency signals corresponding to different kinds of nuclides, the one or more magnetic resonance signals are a plurality of magnetic resonance signals sent by the different kinds of nuclides, and the second communication circuit (12) is configured to transmit the plurality of magnetic resonance signals to the magnetic resonance receiver, respectively.
  3. The system of claim 2, wherein the magnetic resonance system includes the one or more coils, the one or more coils are provided inside or connected to the magnetic resonance system, and the one or more coils are configured to generate a magnetic field that excites resonance of the different kinds of nuclides and/or to collect the plurality of magnetic resonance signals sent by the different kinds of nuclides.
  4. The system of claim 1, wherein the system further comprises a first inductor (L1), a second inductor (L2), a third inductor (L3), a fourth inductor (L4), a fifth inductor (L5), and a capacitive element, wherein the first inductor (L1) is connected between the magnetic resonance transmitter and a ground end, the second inductor (L2) is connected between the first direct current power supply (21) and the first communication circuit (11), the third inductor (L3) is connected between the magnetic resonance receiver and the ground end, the fourth inductor (L4) is connected between the second direct current power supply (22) and the second communication circuit (12), the fifth inductor (L5) is connected between the one or more coils and the ground end, and the capacitive element forms a filter circuit with the second inductor (L2) and the fourth inductor (L4), the filter circuit is configured to filter out interferences from other signals other than the one or more control signals, the plurality of radio frequency signals, and the plurality of magnetic resonance signals.
  5. The system of claim 4, wherein the capacitive element includes a first capacitor (C1) and a second capacitor (C2), the first capacitor (C1) is connected to the second inductor (L2), and the second capacitor (C2) is connected to the fourth inductor (L4), wherein the first capacitor (C1) and the second inductor (C2) form a first filter circuit, and the second capacitor (C2) and the fourth inductor (L4) form a second filter circuit.
  6. The system of claim 1, further comprising a third capacitor (C3), a fourth capacitor (C4), and a fifth capacitor (C5), wherein the third capacitor (C3) is connected between the magnetic resonance transmitter and the first communication circuit (11), and the third capacitor (C3) is configured to isolate a first direct current output from the first direct current power supply (21) to avoid the first direct current passing through the magnetic resonance transmitter when the first communication circuit (11) is turned on; the fourth capacitor (C4) is connected between the magnetic resonance receiver and the second communication circuit (12), and the fourth capacitor (C4) is configured to isolate a second direct current output from the second direct current power supply (22) to avoid the second direct current passing through the magnetic resonance receiver when the second communication circuit (12) is turned on; and the fifth capacitor (C5) is connected between the one or more coils and the communication circuit (10), and the fifth capacitor (C4) is configured to isolate the first direct current and the second direct current to avoid the first direct current and the second direct current passing through the one or more coils.
  7. The system of claim 3, further comprising a radio frequency power amplifier, wherein the radio frequency power amplifier is configured to receive the plurality of radio frequency signals and perform a power amplification, and a bandwidth of the radio frequency power amplifier is within a range of 30 to 405 MHz.
  8. The system of claim 2, wherein the communication circuit (10) further includes a third communication circuit (13) and a fourth communication circuit (14), and the magnetic resonance transmitter is further configured to output two radio frequency signals with a phase difference of 90 degrees to the magnetic resonance radio frequency power transceiver.
  9. The system of claim 8, wherein. the first communication circuit (11) is configured to transmit a first radio frequency signal generated by the magnetic resonance transmitter to the one or more coils, the second communication circuit (12) is configured to transmit a first magnetic resonance signal sent from the one or more coils to the magnetic resonance receiver, the third communication circuit (13) is configured to transmit a second radio frequency signal generated by the magnetic resonance transmitter to the one or more coils, and the fourth communication circuit (14) is configured to transmit a second magnetic resonance signal sent from the one or more coils to the magnetic resonance receiver, wherein a phase difference between the first radio frequency signal and the second radio frequency signal is 90 degrees.
  10. The system of claim 8, wherein the communication circuit (10) includes two radio frequency power switches, the two radio frequency power switches support signal transmission at multiple frequencies and are configured to control an operating mode of the magnetic resonance radio frequency power transceiver, and a frequency point supported by each of the two radio frequency power switches is within a range of 100-500 MHz.
  11. The system of claim 3, wherein the one or more coils includes multiple groups of coils, each group of coils respectively corresponds to the one or more radio frequency signals or the one or more magnetic resonance signals of the different kinds of nuclides.
  12. The system of claim 4, wherein one end of the second inductor (L2) is connected to the first direct current power supply (21), and another end of the second inductor (L2) is respectively connected to the positive electrode of the first diode (D1) and the positive electrode of the second diode (D2).

Description

CROSS-REFERENCE RELATED TO APPLICATIONS This application claims priority to Chinese application No. 202111667375.X filed on December 30, 2021. TECHNICAL FIELD The present disclosure relates to the field of magnetic resonance, and in particular to magnetic resonance systems and magnetic resonance circuits. BACKGROUND With the enhancement of magnetic resonance field strength, the optimization of coil, and the emergence of ultra-high-speed sequences, the research on magnetic resonance of other nuclides (e.g., hydrogen (1H), carbon (13C), nitrogen (15N), fluorine (19F), sodium (23Na), phosphorus (31P), xenon (129Xe), etc.) has also developed rapidly. For the detection of these nuclides, more comprehensive imaging and evaluation of tissues and organs (e.g., the brain, the heart, the lungs, and other tissues and organs) can be performed. To realize the transmission and reception of radio frequencies of different nuclides, the circuits for transmitting and receiving different nuclides in the magnetic resonance radio frequency power transceiver are not the same. However, the method for switching the circuits through a hardware switch to respectively realize functions of the transmission and reception increases the hardware cost of the magnetic resonance radio frequency transceiver, and the efficiency of the transmission and reception of the radio frequency is relatively low. Accordingly, it is desirable to provide magnetic resonance systems and magnetic resonance circuits that can effectively reduce the hardware cost and improve the efficiency of the transmission and reception of the radio frequency. ABOU-KHOUSA MOHAMED A ET AL: "Wideband RF Transmit-Receive Switch for MultiNuclei NMR Spectrometers", IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II: EXPRESS BRIEFS, IEEE, USA, vol. 69, no. 3, 19 October 2021 (2021-10-19), pages 904-908, XP011902859, ISSN: 1549-7747, DOI: 10.1109/TCSll.2021.3121210, relates to a new design of wideband high-power TR switch which could be devised for multi-nuclei NMR spectrometers. CHOI CHANG-HOON ET AL: "Design and construction of a novel1 H/19F double-tuned coil system using PIN-diode switches at 9.4T", JOURNAL OF MAGNETIC RESONANCE, ACADEMIC PRESS, ORLANDO, FL, US, vol. 279, 7 April 2017 (2017-04-07), pages 11-15, XP085023265, ISSN: 1090-7807, DOI: 10.1016/J.JMR.2017.04.005, relates to a novel double-tuned 1H/19F RF coil. CN 113 608 155 A relates to a magnetic resonance multi-core radio frequency coil device, a control method, and a magnetic resonance imaging system. SALEH GAMEEL ET AL: "Dual Tuned Switch for Dual Resonance 1 H/13C MRI Coil", 2021 IEEE INTERNATIONAL IOT, ELECTRONICS AND MECHATRONICS CONFERENCE (IEMTRONICS), IEEE, 21 April 2021 (2021-04-21), pages 1-7, XP033916842, DOI: 10.1109/IEMTRONICS52119.2021.9422627, relates to two transmit/receive switch designs for 7 Tesla magnetic resonance spectroscopic imaging. EP 1 004 886 A2 relates to a magnetic imaging apparatus that includes an RF coil in electrical communication with an RF signal generator and a receiver through an interface circuit (E). SUMMARY The invention is set out in the appended set of claims. BRIEF DESCRIPTION OF THE DRAWINGS The present disclosure is further described in terms of exemplary embodiments. These exemplary embodiments are described in detail with reference to the drawings. These embodiments are non-limiting exemplary embodiments, in which like reference numerals represent similar structures throughout the several views of the drawings, and wherein: FIG. 1 is a schematic diagram illustrating a structure of a magnetic resonance system according to some embodiments of the present disclosure;FIG. 2 is a schematic diagram illustrating a structure of a magnetic resonance circuit according to some embodiments of the present disclosure;FIG. 3 is a schematic diagram illustrating a structure of a magnetic resonance circuit according to some embodiments of the present disclosure;FIG. 4 is a schematic diagram illustrating a structure of a magnetic resonance circuit according to some embodiments of the present disclosure;FIG. 5 is a schematic diagram illustrating a structure of a magnetic resonance circuit according to some embodiments of the present disclosure;FIG. 6 is a schematic diagram illustrating a structure of a magnetic resonance circuit according to some embodiments of the present disclosure;FIG. 7 is a schematic diagram illustrating a structure of a magnetic resonance circuit according to some embodiments of the present disclosure;FIG. 8 is a schematic diagram illustrating a structure of a magnetic resonance circuit according to some embodiments of the present disclosure;FIG. 9 is a schematic diagram illustrating a structure of a magnetic resonance system according to some embodiments of the present disclosure; andFIG. 10 is a schematic diagram illustrating a structure of a magnetic resonance system according to some embodiments of the present disclosure. DETAILED DESCRIPTION In order to illustrate th