th  - 1987 - 51st ENC Conference

Thursday - AM
ACTIVE SHIELD MAGNETS
FOR MAGNETIC RESONANCE IMAGING
David E. Andrews, Ph.D
OXFORD SUPERCONDUCTING TECHNOLOGY
600 Milik Street
Carteret, New Jersey 07008
Clinical installations of magnetic resonance imaging and spectroscopy
systems must contend with the interaction of the magnet with its environment.
In particular, the fringe field of the magnet can restrict choices of
acceptable sites or require cumbersome and expensive steel shielding. A new
class of magnets, termed Active Shield magnets, solve this problem. Active
Shield magnets consist of a novel solenoidal coil configuration which includes
counter running currents to cancel the fringe field. Design principles,
performance specifications and economic considerations will be discussed.