A magnetic resonance imaging system (10) comprises a magnetic gradient coil system (22) configured for generating gradient magnetic fields by providing a predetermined temporal electrical current profile to at least one magnetic gradient coil in accordance with a desired magnetic resonance examination mode. An additional device (50), which is not part of the original magnetic resonance imaging system (10) as such, is intended to be positioned within an inner region (44) of the magnetic resonance imaging system (10) for special examination or other purposes. The additional device (50) is capable of generating an eddy current in at least a portion of the additional device (50) when being exposed to the generated gradient magnetic field. The magnetic resonance imaging system (10) is configured for modifying the predetermined electrical current profile at least on the basis of at least one predetermined parameter set upon receipt of an information indicative of a presence of at least one additional device (50) within an inner region (44) of the magnetic resonance imaging system (10); and - a method of operating a magnetic resonance imaging system (10) with regard to generating a gradient magnetic field by at least one magnetic gradient coil of a gradient coil system (22) in the presence of at least one additional device (50).
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