Ferromagnetic shield for magnetic resonance imaging

Details Ferromagnetic shield for magnetic resonance imaging Ferromagnetic shield for magnetic resonance imaging

2011-04-12

2011-04-12

Arana, Louis M (Department: 2858)

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

C324S320000

Reexamination Certificate

active

07924011

ABSTRACT:
A cryocooler assembly includes a ferromagnetic shield and a moveable rare-earth regenerator for recondensing of a cooling liquid for cooling of a superconductive magnet of a magnetic resonance imaging apparatus. The ferromagnetic shield effectively provides depletion of a magnet field in the vicinity of the rare-earth regenerator and therefore on the one hand reduces the noise impact of the moving regenerator on the homogeneous magnetic field in the imaging volume of the MRI apparatus and on the other hand reduces the mechanical force exerted by the magnetic field on the rare-earth regenerator.

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