MRI magnets
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United States of America Patent
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Mar 28, 1995
Grant Date -
N/A
app pub date -
Jan 4, 1994
filing date -
Apr 8, 1993
priority date (Note) -
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Abstract
An MRI magnet arrangement comprises, an annular electromagnet defined by a coil, an annular shim of magnetic material coaxially disposed within the coil, first permanent magnet means having a field, the direction of which is the same as the field of the coil, disposed coaxially within the said shim and second permanent magnet means disposed coaxially within the said first permanent magnet means, the field of which is arranged to be opposite in direction to the field produced by the said first permanent magnet means, the arrangement being such that the magnetic field produced in an imaging volume within the said second permanent magnet means is substantially homogeneous.
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