Method for determining a B0 map

A system control unit for a magnetic resonance apparatus, the system control unit comprising:

• a processor configured to:
• receive an original magnetic field distribution in a measurement volume of the magnetic resonance apparatus;
• compute a final B0 map that describes a magnetic field distribution produced in the measurement volume of the magnetic resonance apparatus by setting a shim state, wherein the received original magnetic field distribution is the only measured data included in the computation of the final B0 map, and
• wherein a magnetic field distribution produced in the measurement volume of the magnetic resonance apparatus by setting the shim state differs from the original magnetic field distribution.

A magnetic resonance apparatus comprising:

• a system control unit comprising:
• a processor configured to:
• measure an original magnetic field distribution in a measurement volume of the magnetic resonance apparatus;
• set a shim state in the measurement volume of the magnetic resonance apparatus based on the measured original magnetic field distribution, wherein a magnetic field distribution produced in the measurement volume of the magnetic resonance apparatus by setting the shim state differs from the original magnetic field distribution;
• and
• compute a final B0 map that describes a magnetic field distribution produced in the measurement volume of the magnetic resonance apparatus by the setting of a shim state,
• wherein the measured original magnetic field distribution is the only measured data included in the computation of the final B0 map.

In a non-transitory computer-readable storage medium that stores instructions executable by a system control unit of a magnetic resonance apparatus to compute a final B0 map for performing an imaging magnetic resonance measurement using a magnetic resonance apparatus, the instructions comprising:

• measuring an original magnetic field distribution in a measurement volume of the magnetic resonance apparatus;
• and
• computing a final B0 map that describes a magnetic field distribution produced in the measurement volume of the magnetic resonance apparatus by setting a shim state, wherein the measured original magnetic field distribution is the only measured data included in the computing of the final B0 map, and
• wherein a magnetic field distribution produced in the measurement volume of the magnetic resonance apparatus by setting the shim state differs from the original magnetic field distribution.