Radio frequency transmission device and magnetic resonance system
The present disclosure may provide a radio frequency transmission device. The radio frequency transmission device may include: a radio frequency power amplifier (RFPA) configured to produce a radio frequency signal; and a transmitter coil status selection module configured to transmit the radio frequency signal to at least one of a plurality of radio frequency coils. The RFPA and the transmitter coil status selection module may be housed in a device chamber.
1 . A radio frequency transmission device, comprising:
a radio frequency power amplifier (RFPA) configured to produce a radio frequency signal;
a transmitter coil status selection module configured to transmit the radio frequency signal to at least one of a plurality of radio frequency coils, wherein the RFPA and the transmitter coil status selection module are housed in a device chamber; and
an impedance matching module connected to and in between the RFPA and the transmitter coil status selection module, wherein the impedance matching module is configured to receive the radio frequency signal from the RFPA and transmit the radio frequency signal to the transmitter coil status selection module,
wherein
the impedance matching module includes at least one capacitor, at least one inductor, and at least one switch control sub-module, each of the at least one inductor and the at least one capacitor has a switch, the at least one switch control sub-module is configured to close or open at least one switch of the at least one inductor and the at least one capacitor, and a count of the at least one switch control sub-module is smaller than a sum of a count of the at least one capacitor and a count of the at least one inductor, wherein
the impedance matching module includes the at least one capacitor and a detuning sub-module including a second capacitor and second inductor;
a first end of the detuning sub-module is operably connected to an output end of the RFPA:
a second end of the detuning sub-module is operably connected to the transmitter coil status selection module;
a first end of the at least one capacitor is operably connected to and in between the output end of the RFPA and the detuning sub-module;
a second end of the at least one capacitor is operably connected to ground,
wherein the impedance matching module further includes an adjustment sub-module operably connected to the detuning sub-module and the first capacitor; and
the adjustment sub-module is configured to adjust at least one of a capacitance of the at least one capacitor or a capacitance of the second capacitor based on the load impedance of the radio frequency transmission device.
2 . The radio frequency transmission device of claim 1 , wherein the impedance matching module is housed in the device chamber.
3 . The radio frequency transmission device of claim 1 , wherein the impedance matching module includes an L matching network, a PI matching network, a T matching network, or a multi-level matching network.
4 . The radio frequency transmission device of claim 3 , wherein the impedance matching module includes the multi-level matching network, and the multi-level matching network includes two L matching networks, an L matching network and a PI matching network, or an L matching network and two PI matching networks.
5 . The radio frequency transmission device of claim 1 , wherein
an equivalent impedance produced by the at least one inductor and the at least one capacitor matches a load impedance of the radio frequency transmission device.
6 . The radio frequency transmission device of claim 5 , wherein the at least one adjustment sub-module is further configured to adjust at least one inductance of the at least one inductor based on the load impedance of the radio frequency transmission device, one of the at least one inductor includes a ferrite core, and the at least one adjustment sub-module adjusts an inductance of the inductor by adjusting a position of the ferrite core.
7 . The radio frequency transmission device of claim 1 , wherein one of the at least one capacitor includes a vacuum capacitor or a variable diode.
8 . The radio frequency transmission device of claim 1 , wherein the switch includes a diode.
9 . The radio frequency transmission device of claim 1 , wherein the transmitter coil status selection module includes a plurality of switches operably connected to the plurality of coils;
the transmitter coil status selection module transmits the radio frequency signal to the at least one of the plurality of radio frequency coils by closing at least one of the plurality of switches corresponding to the at least one radio frequency coil.
10 . The radio frequency transmission device of claim 1 , further comprising an interference reduction module housed in the device chamber, wherein the interference reduction module is configured to reduce electromagnetic interference between the RFPA and the transmitter coil status selection module.
11 . The radio frequency transmission device of claim 1 , wherein the radio frequency transmission device is located in an environment with a magnetic field.
12 . The radio frequency transmission device of claim 11 , wherein the magnetic field includes at least one of a static magnetic field, a gradient field, or a radio frequency field.
13 . The radio frequency transmission device of claim 1 , wherein
an equivalent impedance produced by the at least one inductor and the at least one capacitor matches a load impedance of the radio frequency transmission device.
14 . The radio frequency transmission device of claim 1 , wherein the impedance matching module includes a third capacitor, a fourth capacitor, a fifth capacitor, a second inductor, a third inductor, and a fourth inductor, the third capacitor, the fourth capacitor, and the fifth capacitor are operably connected in parallel, the second inductor, the third inductor, and the fourth inductor are operably connected in series, the third capacitor is operably connected to an output end of the RFPA, an end of the fourth inductor is operably connected to the transmitter coil status selection module, each of the second inductor, the third inductor, and the fourth inductor has a switch in parallel connection, and each of the third capacitor, the fourth capacitor, and the fifth capacitor has a switch in series connection.
15 . The radio frequency transmission device of claim 1 , wherein the impedance matching module further includes the at least one adjustment sub-module; and the at least one adjustment sub-module is configured to adjust at least one capacitance of the at least one capacitor based on a load impedance of the radio frequency transmission device.
16 . A radio frequency transmission device, comprising a radio frequency power amplifier (RFPA), an impedance matching module, and a transmitter coil status selection module, wherein:
the RFPA is configured to produce a radio frequency signal;
the impedance matching module is configured to receive the radio frequency signal from the RFPA and transmit the radio frequency signal to the transmitter coil status selection module; and
the transmitter coil status selection module is configured to transmit the radio frequency signal to at least one of a plurality of radio frequency coils, wherein the RFPA, the impedance matching module, and the transmitter coil status selection module are housed in a room, and wherein
impedance matching module includes at least one capacitor, at least one inductor, and at least one switch control sub-module, each of the at least one inductor and the at least one capacitor has a switch, the at least one switch control sub-module is configured to close or open at least one switch of the at least one inductor and the at least one capacitor, and a count of the at least one switch control sub-module is smaller than a sum of a count of the at least one capacitor and a count of the at least one inductor, wherein
the impedance matching module includes the at least one capacitor and a detuning sub-module including a second capacitor and second inductor;
a first end of the detuning sub-module is operably connected to an output end of the RFPA;
a second end of the detuning sub-module is operably connected to the transmitter coil status selection module:
a first end of the at least one capacitor is operably connected to and in between the output end of the RFPA and the detuning sub-module;
a second end of the at least one capacitor is operably connected to ground,
wherein the impedance matching module further includes an adjustment sub-module operably connected to the detuning sub-module and the first capacitor; and
the adjustment sub-module is configured to adjust at least one of a capacitance of the at least one capacitor or a capacitance of the second capacitor based on the load impedance of the radio frequency transmission device.
17 . A magnetic resonance (MR) system, comprising:
a computing device, a magnetic resonance spectrometer, a gradient power amplifier, a magnet, and a radio frequency transmission device, wherein the computing device is operably connected to the magnetic resonance spectrometer; and
the magnetic resonance spectrometer is operably connected to the radio frequency transmission device and the gradient power amplifier, wherein the radio frequency transmission device includes:
a radio frequency power amplifier (RFPA) configured to produce a radio frequency signal; a transmitter coil status selection module configured to transmit the radio frequency signal to at least one of a plurality of radio frequency coils, wherein the RFPA and the transmitter coil status selection module are housed in a device chamber; and an impedance matching module connected to and in between the RFPA and the transmitter coil status selection module, wherein the impedance matching module is configured to receive the radio frequency signal from the RFPA and transmit the radio frequency signal to the transmitter coil status selection module, wherein
the impedance matching module includes at least one capacitor, at least one inductor, and at least one switch control sub-module, each of the at least one inductor and the at least one capacitor has a switch, the at least one switch control sub-module is configured to close or open at least one switch of the at least one inductor and the at least one capacitor, and a count of the at least one switch control sub-module is smaller than a sum of a count of the at least one capacitor and a count of the at least-one inductor,
wherein the impedance matching module includes the at least one capacitor, a second capacitor, the at least one inductor, and at least one adjustment sub-module,
the second capacitor and the at least one inductor are connected in series,
a first end of the second capacitor is operably connected to an output end of the RFPA, and a second end of the second capacitor is operably connected to the at least one inductor;
a first end of the at least one inductor is operably connected to the second capacitor, and
a second end of the at least one inductor is operably connected to the transmitter coil status selection module, a first end of the at least one capacitor is operably connected to and in between the output end of the RFPA and the second capacitor, and
a second end of the at least one capacitor is operably connected to ground,
and the at least one adjustment sub-module is operably connected to the at least one capacitor, and the second capacitor, respectively, and is configured to adjust a capacitance of the at least one capacitor and/or a capacitance of the second capacitor.