Cryocooler vibration isolation and noise reduction in magnetic resonance imaging

摘要

Vibration and noise isolation for a magnetic resonance imager (MRI) superconducting magnet cryocooler includes a bellows (28) between the cryocooler (12) and its vacuum sleeve (14) in the magnet, a mass suspended along the axis of, but at a distance from, the cryocooler, elastomeric blocks (30) parallel to the axis, and braided copper wires (22) connecting the vacuum sleeve and the heat shields (25) of the MRI. Motion limiters and bellows flexures are provided for dynamic loads which might be encountered during transport of the magnet.