PRODUCTION OF GRADIENT MAGNETIC FIELD COIL AND COIL UNIT FOR GRADIENT MAGNETIC FIELD AND GRADIENT MAGNETIC FIELD COIL

摘要

PURPOSE:To obtain the gradient magnetic field coil having good linearity by expressing the current distributions of a two-dimensional space with specific equations, making optimization calculation of the coeffts. in the equations in such a manner that the linearity of the required gradient magnetic field can be obtd. and determining a coil pattern by using the resulted current distributions. CONSTITUTION:The current distributions Jgamma, Jphi of the two-dimensional space are expressed by the equations I, II. In the equations, Ro is the max. radius at which the current distributions exist. The coeffts. Sn, Cm are determined by making the optimization calculation in such a manner that the linearity of the required gradient magnetic field is obtd. in the required space region. The coil patterns on the two-dimensional plane are determined by using the current distributions Jgamma, Jphi of the gradient magnetic field obtd. in accordance with the determined coeffts. Sn, Cm. The coil B12 is provided in the position of the distance 2Zo below the coil A11 in such a manner and thus the radius of the pattern on the outermost side of the coil A11 and the coil B12 is Ro.