Magnetic-resonance compatible earphone, magnetic-resonance compatible intercom system and head coil apparatus

A magnetic-resonance imaging system compatible intercom system, comprising:

• a sound receiver, comprising:
• a microphone configured to convert an audio signal to an analog signal,
• a first audio codec configured to generate a digital signal based on the analog signal generated by the microphone, and
• a first audio processor configured to generate an output signal based on the digital signal generated by the first audio codec;
• and
• a sound transmitter, comprising:
• a second audio processor configured to generate an input signal based on the output signal generated by the first audio processor;
• a second audio codec configured to generate an analog signal based on the input signal;
• and
• a magnetic-resonance imaging system compatible earphone configured to emit sound according to the analog signal generated by the second audio codec, the magnetic-resonance imaging system compatible earphone comprising:
• an earphone body;
• a diaphragm arranged on the earphone body;
• a drive coil arranged on the earphone body, the drive coil being configured to receive audio current;
• an elastic sheet disposed on the earphone body, the drive coil being fixed to the elastic sheet;
• and
• a transmission member connecting the elastic sheet and the diaphragm,
• wherein upon receiving the audio current, the drive coil is configured to generate a Lorentz force in response a main magnetic field that is generated via a magnetic resonance imaging system,
• wherein the drive coil is configured to cause, via the Lorentz force generated by the drive coil, the elastic sheet to elastically deform to induce movement in the transmission member, and
• wherein the movement of the transmission member drives the diaphragm to thereby generate sound via vibration.

A head coil, comprising:

• a body configured to accommodate a head of an examination subject and to receive magnetic resonance signals of the head of the examination subject;
• a set of airbags, each one of the set of airbags being disposed on the body and respectively corresponding to two ears of the examination subject;
• and
• a set of magnetic-resonance imaging system compatible earphones, each one of the set of magnetic-resonance imaging system compatible earphones comprising:
• an earphone body;
• a diaphragm arranged on the earphone body;
• a drive coil arranged on the earphone body, the drive coil being configured to receive audio current;
• an elastic sheet disposed on the earphone body, the drive coil being fixed to the elastic sheet;
• and
• a transmission member connecting the elastic sheet and the diaphragm,
• wherein upon receiving the audio current, the drive coil is configured to generate a Lorentz force in response to a main magnetic field that is generated via a magnetic resonance imaging system,
• wherein the drive coil is configured to cause, via the Lorentz force generated by the drive coil, the elastic sheet to elastically deform to induce movement in the transmission member, and
• wherein the movement of the transmission member drives the diaphragm to thereby generate sound via vibration,
• wherein each one of the set of magnetic-resonance imaging system compatible earphones is respectively connected to each one of the set of air bags and configured to transmit sound to the two ears of the examination subject, and
• wherein each one of the set of airbags is configured to be inflated and deflated to adjust a distance between each one of the set of the magnetic-resonance compatible earphones and a respective one of the two ears of the examination subject.