Method for mfg. gradient coil, gradient coil unit, gradient coil nuclear magnetic resonance imaging apparatus

Application Number: 00118845
Application Date: 2000.06.21
Publication Number: 1278422
Publication Date: 2001.01.03
Priority Information: 1999/6/21 JP 173553/99
International: G01R33/385
Applicant(s) Name: Yokogawa General Electric Medical System Co., Ltd.
Inventor(s) Name: Ushiroto Takao;Iue Yuni
Patent Agency Code: 72001
Patent Agent: liang yong
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[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[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[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..