Magnetic resonance multi-core radio frequency coil device and control method, and magnetic resonance imaging system

A magnetic resonance multi-core radio frequency coil device, comprising a first birdcage coil and a second birdcage coil which are coaxially nested;

• wherein the first birdcage coil comprises four first end rings arranged along an axial direction and a plurality of first leg structures extending along the axial direction and arranged along a circumferential direction;
• each of the plurality of first leg structures is connected to the four first end rings;
• the second birdcage coil comprises two second end rings arranged along the axial direction and a plurality of second leg structures extending along the axial direction and arranged along the circumferential direction;
• and each of the plurality of second leg structures is connected to the two second end rings;
• the first birdcage coil is configured to transmit and receive radio frequency energy at frequencies corresponding to three different nuclides;
• the second birdcage coil is configured to transmit and receive radio frequency energy at a frequency corresponding to a nuclide;
• and the nuclides corresponding to the first birdcage coil are different from the nuclide corresponding to the second birdcage coil;
• the first birdcage coil is provided with a first tuning and detuning control circuit;
• and the second birdcage coil is provided with a second tuning and detuning control circuit;
• and
• the first tuning and detuning control circuit and the second tuning and detuning control circuit are configured in the following manners:
• in response to the first tuning and detuning control circuit being configured to control the first birdcage coil to be in a tuned state, the second tuning and detuning control circuit is configured to control the second birdcage coil to be in a detuned state;
• and
• in response to the second tuning and detuning control circuit being configured to control the second birdcage coil to be in the tuned state, the first tuning and detuning control circuit is configured to control the first birdcage coil to be in the detuned state.