Gradient coil system for use in MRI apparatus with unique wiring arrangement
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United States of America Patent
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Mar 4, 2003
Grant Date -
Sep 26, 2002
app pub date -
Apr 10, 2000
filing date -
Jun 21, 1999
priority date (Note) -
Expired
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Abstract
In order to obtain good linearity without reducing efficiency in generating a magnetic field, a winding pattern of one semicircular spiral is assumed; an electric current distribution is expressed by a continuous function J.sub.x (x) such that an x-axis electric current distribution profile does not lie in both the positive and negative polarities; parameters of the continuous function J.sub.x (x) are optimized so that desired linearity can be obtained; and a position of a straight-line portion 1Xt1L of the semicircular spiral is determined so that the electric current distribution profile given by the optimized continuous function J.sub.x (x) is fulfilled. The resulting pattern is symmetrically duplicated to generate a gradient coil unit 1Xt, and a plurality of the gradient coil units 1Xt are combined to form a gradient coil.
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