Apparatus and method for magnetic resonance imaging using pre-polarizing field
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United States of America Patent
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Jul 16, 1996
Issued Date -
N/A
app pub date -
Dec 22, 1994
filing date -
Jul 3, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In an apparatus and method for magnetic resonance imaging, an imaging field (B.sub.p) and a pre-polarization field (B.sub.p) are generated by means of electromagnetic coils ALC in an air gap between pole pieces of a magnet core. The pole pieces are designed such that, as the current in the coils is increased, the field strength increases only in the central area between pole pieces up to the strength (B.sub.p) of the pre-polarization field. This is due to the saturation of the edge zones of pole pieces that restricts the increase of field strength in the edge zones of the air gap.
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