Electromagnet arrangements for producing a magnetic field of high homogenity
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United States of America Patent
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Dec 1, 1987
Grant Date -
N/A
app pub date -
Dec 3, 1986
filing date -
Dec 9, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A coil arrangement for producing a magnetic field of high homogeneity, such as is required in magnetic resonance imaging, comprising a single pair of identical annular coils (17A, 17B) disposed coaxially in spaced relationship and a pair of annular members (19A, 19B) of ferromagnetic material disposed coaxially with the coils, symmetrically with respect to the plane which perpendicularly intersects the axis of the coils centrally between them. The coils and ferromagnetic members have dimensions and are relatively positioned so that, with the coils carrying equal energizing currents, the more significant spherical harmonic coefficients are eliminated.
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