Apparatus and method for spatial encoding using a radio frequency signal in magnetic resonance tomography

A magnetic resonance tomograph comprising:

• an apparatus for spatial encoding in magnetic resonance tomography with a magnetic resonance tomograph, the apparatus comprising:
• a radio frequency (RF) unit configured to generate a first RF signal with a first frequency and a second RF signal with a second frequency with a high output, wherein the first frequency and the second frequency are close to a Larmor frequency of the magnetic resonance tomograph, and the first frequency is not equal to the second frequency;
• and
• an antenna apparatus configured to emit the first RF signal and the second RF signal in an examination region of the magnetic resonance tomograph,
• wherein the magnetic resonance tomograph is configured to:
• determine a first set of parameters from the first frequency and a first amplitude, and from the second frequency and a second amplitude, such that when signals are transmitted according to parameters in the first set of parameters via the antenna apparatus, a first gradient of a Larmor frequency of nuclear spins is generated by the Bloch-Siegert effect;
• and
• generate the first RF signal and the second RF signal according to the first set of parameters using the radio frequency unit;
• and
• transmit the first RF signal and the second RF signal to the examination region using the antenna apparatus for spatial encoding of the nuclear spins.

A method for operating a magnetic resonance tomograph and a radio frequency unit, the method comprising:

• determining, by the magnetic resonance tomograph, a first set of parameters from a first frequency and a first amplitude, and from a second frequency and a second amplitude, such that during transmission of signals according to parameters in the first set of parameters via an antenna apparatus, a first gradient above the Larmor frequency of nuclear spins is generated by the Bloch-Siegert effect;
• generating signals according to the first set of parameters using a radio frequency unit;
• transmitting the signals generated according to the first set of parameters to an examination region by the antenna apparatus;
• determining a second set of parameters from a third frequency and a third amplitude, and from a fourth frequency and a fourth amplitude by the magnetic resonance tomograph, such that during transmission of signals according to parameters in the second set of parameters via the antenna apparatus, a second gradient above the Larmor frequency of the nuclear spins is generated by the Bloch-Siegert effect, wherein the first set of parameters and the second set of parameters differ at least in the first frequency, the first amplitude, the second frequency, the second amplitude, or any combination thereof of the first set of parameters from the third frequency, the third amplitude, the fourth frequency, the fourth amplitude, or any combination thereof of the second set of parameters, respectively;
• generating signals according to the second set of parameters using the radio frequency unit;
• and
• transmitting the signals generated according to the second set of parameters to the examination region using the antenna apparatus.