Method for operating a magnetic resonance facility, magnetic resonance facility, associated control facility and associated storage unit

A magnetic resonance system configured to perform imaging for capturing image data that relates to an object that is arranged in an acquisition area of the magnetic resonance system, the magnetic resonance system comprising:

• a magnet system, by which a system magnetic field present in the acquisition area is generatable, wherein a disrupted magnetic field actually present in the acquisition area results from the system magnetic field and at least one interference field, wherein the at least one interference field is caused by an interference object located outside the acquisition area,
• at least one magnetic sensor configured to capture at least one item of measurement information that relates to a stray magnetic field present outside the acquisition area and resulting from the system magnetic field and the at least one interference field;
• a controller configured to:
• determine at least one item of interference information relating to the at least one interference field using the at least one item of measurement information;
• generate control signals and output the control signals to the magnetic resonance system, such that the at least one interference field is compensatable for or reduced in the acquisition area by changing the system magnetic field using the at least one item of interference information;
• in order to determine the at least one item of interference information, perform a modeling of the at least one interference field using the at least one item of measurement information,
• wherein for the modeling, a field model describing a vector field for the at least one interference field is used.

A controller for a magnetic resonance system, the controller comprising:

• one or more processors;
• a storage unit that stores a computer program executable by the one or more processors to:
• determine at least one item of interference information relating to at least one interference field using the at least one item of measurement information;
• and
• generate control signals and output the control signals to the magnetic resonance system, such that the at least one interference field is compensated for or reduced in an acquisition area by changing a system magnetic field using the at least one item of interference information.

A storage unit for a controller, the storage unit comprising:

• a non-transitory computer-readable storage medium that stores an executable computer program executable by one or more processors to:
• determine at least one item of interference information relating to at least one interference field using at least one item of measurement information;
• and
• generate control signals and output the control signals to a magnetic resonance system, such that the at least one interference field is compensated for or reduced in an acquisition area by changing a system magnetic field using the at least one item of interference information.