Method and system for reducing magnetic field instabilities in a magnetic resonance system

A system for reducing instability in an imaging magnetic field in an imaging bore of a magnetic resonance imaging (MRI) system during imaging, the system comprising:

• a processor having memory containing instructions to:
• identify an instability within the imaging magnetic field;
• determine a stability field in response to the instability in the imaging magnetic field, the stability field being a magnetic field that is similar but opposite to that caused by the instability in the imaging magnetic field;
• decompose the stability field temporally into Fourier domain and extracting amplitude and phase for each spatial position as stability parameters;
• and
• create at least two spatial magnetic field components from the stability parameters with a phase separation therebetween as a first magnetic field component and a second magnetic field component;
• and
• an electromagnet assembly coupled to the processor to receive the first and second magnetic field components therefrom, the electromagnet assembly configured to generate the first and second magnetic field components as a corrective magnetic field in the imaging bore of the MRI system to reduce the instability in the imaging magnetic field.