MRI magnets
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United States of America Patent
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Nov 9, 1999
Grant Date -
N/A
app pub date -
Jan 16, 1997
filing date -
Jan 19, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An open electromagnet for use in MRI apparatus includes a pair of field coils which respectively comprise juxtaposed poles between which an imaging volume of substantially homogeneous magnetic field is defined. A support structure, which serves rigidly to support the field coils in spaced apart relationship, includes two steel plates between which the field coils are positioned. The relative position of the field coils and the plates is selected such that forces of magnetic attraction between the field coils are at least partly counter-balanced by forces of attraction between the plates and the field coils. In this manner, the force on the field coils and their associated support structure due to the forces of attraction between the poles is significantly reduced or nullified.
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