Radio frequency coil assembly with signal adjustment circuit, related method and computer program product
In the case of a radio frequency (RF) coil assembly for a magnetic resonance (MR) imaging system, interference in a galvanic transmission line ( 1 ) configured to transmit a digital signal should be avoided. This is achieved in that a signal circuit (Pr 2 ) is provided, configured to monitor non-differential asymmetries around the Larmor frequency in a signal through the galvanic transmission line ( 1 ), wherein the signal circuit (Pr 2 ) is configured to provide feedback to a digital adjustment circuit ( 4 ), wherein the digital adjustment circuit ( 4 ) is configured to compensate for non-differential asymmetries around the Larmor frequency in the digital signal by adjusting phase and/or amplitude of the digital signal based on monitored measured values of the signal circuit (Pr 2 ). Furthermore, the invention relates to a method for compensating for non-differential asymmetries around the Larmor frequency in a digital signal in a galvanic transmission line ( 1 ) of a radio frequency (RF) coil assembly.
1 . A radio frequency (RF) coil assembly for a magnetic resonance (MR) imaging system, the assembly comprising:
a galvanic transmission line configured to transmit a digital signal via low voltage differential signaling,
a signal circuit (Pr 2 ), configured to monitor non-differential asymmetries around the Larmor frequency in the digital signal through the galvanic transmission line, wherein the signal circuit (Pr 2 ) is configured to provide feedback to a digital adjustment circuit, wherein the digital adjustment circuit is configured to compensate for non-differential asymmetries around the Larmor frequency in the digital signal by adjusting phase and/or amplitude of the digital signal based on monitored measured values of the signal circuit (Pr 2 ).
2 . The radio frequency (RF) coil assembly according to claim 1 , wherein the digital adjustment circuit comprises at least one amplifier, wherein the digital adjustment circuit is configured to adjust the amplitude by changing the bias point of the amplifier.
3 . The radio frequency (RF) coil assembly according to claim 1 , wherein the digital adjustment circuit comprises a programmable delay line for adjusting the phase of the digital signal.
4 . The radio frequency (RF) coil assembly according to claim 1 , wherein the digital adjustment circuit comprises at least one single pole double throw (SPDT) switch for adjusting the phase of the digital signal.
5 . The radio frequency (RF) coil assembly according to claim 1 , wherein the digital adjustment circuit comprises a tunable 2-port for adjusting the amplitude and the phase of the digital signal together.
6 . The radio frequency (RF) coil assembly according to claim 5 , wherein the tunable 2-port is a lumped element transmission line.
7 . The radio frequency (RF) coil assembly according to claim 1 , wherein the digital signal is a digital magnetic resonance (MR) signal.
8 . A magnetic resonance (MR) imaging system comprising a radio frequency (RF) coil assembly according to claim 1 .
9 . A method for compensating for non-differential asymmetries around the Larmor frequency in a digital signal in a galvanic transmission line of a radio frequency (RF) coil assembly for a magnetic resonance (MR) imaging system, the method comprising the following steps:
providing a radio frequency (RF) coil assembly according to claim 1 ,
measuring non-differential asymmetries around the Larmor frequency in a signal through the galvanic transmission line by the signal circuit (Pr 2 ),
compensating for non-differential asymmetries around the Larmor frequency in the digital signal by adjusting phase and/or amplitude of the digital signal by the digital adjustment circuit based on monitored measured values of the signal circuit (Pr 2 ).
10 . The method according to claim 9 , wherein the step of compensating for non-differential asymmetries around the Larmor frequency in the digital signal by adjusting phase and/or amplitude of the digital signal by the digital adjustment circuit comprises a step of adjusting the amplitude and the phase together by a tunable 2-port.
11 . The method according to claim 10 , wherein parameters for the step of compensating for non-differential asymmetries around the Larmor frequency in the digital signal by adjusting phase and amplitude of the digital signal by the digital adjustment circuit are loaded by a remote operator or a control service software to the adjustment circuit.
12 . A computer program product comprising instructions to cause a radio frequency (RF) coil assembly of claim 1 to execute a method comprising:
measuring non-differential asymmetries around the Larmor frequency in a signal through the galvanic transmission line by the signal circuit (Pr 2 ), and
compensating for non-differential asymmetries around the Larmor frequency in the digital signal by adjusting phase and/or amplitude of the digital signal by the digital adjustment circuit based on monitored measured values of the signal circuit (Pr 2 ).
13 . The computer program product according to claim 12 , wherein the computer program product is performed on a neural network.
14 . Use of a radio frequency (RF) coil assembly according to claim 1 inside a flexible magnetic resonance imaging receive array.