Calling device of magnetic resonance imaging system and magnetic resonance imaging system

A calling device of a magnetic resonance imaging system, comprising:

• a reader/writer configured to send a fixed-frequency electromagnetic wave to form a radio-frequency (RF) electromagnetic field in a detection area of the magnetic resonance imaging system;
• and
• a call maker comprising:
• a main body,
• an antenna that is arranged on the main body and configured to generate an induced current after receiving the fixed-frequency electromagnetic wave,
• an operating member that is arranged on the main body and configured to switch between a first position and a second position relative to the main body, and
• an answering controller that is arranged on the main body and connected to the antenna, the answering controller being configured to:
• in response to the operating member being in the first position, send a first radio-frequency signal through the antenna with energy obtained from the induced current generated by the antenna;
• in response to the operating member being in the second position, send a second radio-frequency signal through the antenna with energy obtained from the induced current generated by the antenna,
• wherein the reader/writer is configured to receive the first radio-frequency signal and the second radio-frequency signal, and send different prompt signals according to the first radio-frequency signal and the second radio-frequency signal, respectively.