Recording a B0 map of a main magnetic field of a magnetic resonance device in an imaging volume of which an object to be recorded is arranged

A magnetic resonance device comprising:

• a controller configured to:
• record a B0 map of a main magnetic field of a magnetic resonance device in an imaging volume of which an object to be recorded is arranged, record of the B0 map comprising:
• ascertainment of the B0 map, the ascertainment of the B0 map comprising scan of a recording region to be covered by the B0 map by a map recording sequence slice-by-slice in successive slices in a slice selection direction extending in a phase encoding direction and a readout direction, or three-dimensionally using two phase encoding directions and one readout direction;
• ascertainment, in a preliminary scan, extension information describing an extension of the object using a scout sequence that is used to define the recording region in sequence parameters of the map recording sequence, to adjust at least one sequence parameter of the map recording sequence describing a spatial position of the slice selection direction, the phase encoding direction or the two phase encoding directions, the one readout direction, or any combination thereof, or define the recording region in sequence parameters of the map recording sequence and adjust at least one sequence parameter of the map recording sequence.

In a non-transitory computer-readable storage medium that stores instructions executable by one or more processors to record a B0 map of a main magnetic field of a magnetic resonance device in an imaging volume of which an object to be recorded is arranged, the instructions being executable by the one or more processors to:

• ascertain the B0 map, the ascertaining of the B0 map comprising scanning, by the magnetic resonance device, a recording region to be covered by the B0 map by a map recording sequence slice-by-slice in successive slices in a slice selection direction extending in a phase encoding direction and a readout direction, or three-dimensionally using two phase encoding directions and one readout direction;
• and
• ascertain, using the magnetic resonance device, in a preliminary scan, extension information describing an extension of the object using a scout sequence that is used to define the recording region in sequence parameters of the map recording sequence, to adjust at least one sequence parameter of the map recording sequence describing a spatial position of the slice selection direction, the phase encoding direction or the two phase encoding directions, the one readout direction, or any combination thereof, or define the recording region in sequence parameters of the map recording sequence and adjust at least one sequence parameter of the map recording sequence.