Supplementary fields production coils system for generating polarisation fields with constant gradients by a magnet comprising polarisation polar elements for NMR imaging

摘要

the system of field coil in a magnet with a net addition of pole pieces (1, 2) for magnetic resonance imaging.it includes: the establishment of the gradientsdeux or orthogonal windings (1a, 2a, 1b, 2b), one on each pole piece; the establishment of the system of gradientdeux coils (8, 9, 10, 13, 14) of circular symmetry axis oz, located on the inside in relation to the parts p olaires and driven by currents of opposite directions of a pole piece to the other.