Shim Parameter Set Ascertainment for a Magnetic Resonance Facility

A computer-implemented method for ascertaining a shim parameter set for shimming a magnetic resonance facility to improve homogeneity in a homogeneity volume, the method comprising:

• receiving an input data set comprising at least one current measurement result of a magnetic field measurement at the magnetic resonance facility;
• maintaining a database in which source data sets are stored for magnetic resonance facilities installed at an operating location for which a shim operation has been completed at the operating location, wherein each source data set comprises:
• an original measurement result of a magnetic field measurement prior to the shim operation at the operating location, and
• shim parameters obtained as a final result of the shim operation at the operating location, the shim parameters having been ascertained considering magnetic influences at the respective operating location;
• and
• ascertaining the shim parameter set by applying an ascertainment function to the input data set and the source data sets, wherein the ascertainment function accounts for local magnetic influences using the source data sets and outputs an output data set comprising the shim parameter set.