MRI Superconducting Magnet Radiation Shield Annular Rib

The radiation shield is divided into multiple segments along the axial direction with gaps between them. This segmentation interrupts the continuous conductive path in the radiation shield, preventing eddy currents from forming closed loops. The segmented structure allows the system to maintain high magnetic field strength for fast imaging while eliminating the harmful eddy currents that cause vibrations and magnetic field non-uniformity.

Non-conductive support pillars are introduced as intermediary elements between the gradient magnetic field coil and the radiation shield. These pillars provide mechanical support while electrically isolating the radiation shield from the gradient coil, preventing the induction of eddy currents in the radiation shield during rapid gradient field switching. This allows high-speed imaging without generating harmful vibrations.

The radiation shield is segmented into multiple pieces with gaps between them, which interrupts the continuous conductive path required for eddy current formation. The segmented structure maintains sufficient thermal conductivity through the individual segments while preventing the circular current paths that generate harmful vibrations during magnetic field operations.

The patent uses multiple thin radiation shield segments rather than a single thick continuous shield. These segmented structures provide adequate radiation protection and thermal management while inherently preventing eddy currents, offering a cost-effective solution that eliminates vibration problems without requiring expensive active compensation systems.