Vibrational Magnetic Field Distortion Compensation System in MRI Superconducting Magnets

Superconducting magnets in MRIs are subject to various sources of vibrations. As the magnets respond to these excitations, eddy currents are generated in metallic structures in the cryostat and create their own magnetic fields inside the region of interest (ROI) where the imaging process takes place. Because these vibration-induced magnetic field distortions are not synchronized with pulse sequences, they are especially detrimental to image quality. In this paper, a novel passive compensation method for vibrational magnetic field distortions is presented. It provides a cost-effective solution that is capable of compensating dynamic field distortions over broad-band frequency ranges and complex vibrational behaviors.