MRI magnet with robust laminated magnetic circuit member and met

Details MRI magnet with robust laminated magnetic circuit member and met MRI magnet with robust laminated magnetic circuit member and met

1993-10-26

1994-05-31

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

H01F 300

Patent

active

053172973

ABSTRACT:
An MRI magnet member (e.g., a pole piece or tip) is laminated using relatively large bar-shaped laminations instead of the usual thin sheet material. One or more layers of such bar-shaped laminations are arrayed with small insulating gaps into which a low loss insulating liquid filler material is flowed and then cured to a hardened solid state. This simultaneously produces insulated pole tip laminations which have been robustly integrated together into a unitary structure. The resulting robust laminated pole tip is relatively easy to manufacture and is also capable of withstanding rather large magnetic forces and maintaining relatively uniform magnetic field distribution within an MRI imaging region while yet providing providing sufficient eddy current reduction so as to efficiently permit rapidly changing magnetic gradient coil currents to be established.

REFERENCES:
patent: 4990879 (1991-02-01), Aubert

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