Operating method for a magnetic resonance system with - compensation of maxwell - terms of the second order

摘要

A magnetic resonance system has a base of the magnet system (1), by means of which, in a test volume (2) of the magnetic resonance system a temporally static, locally homogeneous basic magnetic field (b₀) can be generated. Furthermore, it has at least one rf system (4), by means of which a in the examination volume (2) which is arranged in the examination subject (5) can be excited to magnetic resonances and by means of whose in the examination subject (5) can be received magnetic resonances are excited. Also, it has a system (6), by means of which the examination volume (2) by means of storage fields (b with_x, B_y, B_z, B₁, B₂, B₃, B₄, B₄'', B₄'''') can be acted upon, so that the basic magnetic field (b₀) and which, by means of storage fields (b_x, B_y, B_z, B₁, B₂, B₃, B₄, B₄'', B₄'''') to form a total field (b) are superimposed. The system (6) comprises at least a first order system (7) and a system of the second order (13). The system of the first order (7) is designed in such a way that of the fields (b_x, B_y, B_z) are generated in a first approximation, have a location-dependency of the first order. The system of the second order (13) is designed in such a way that of the fields (b₁, B₂, B₃, B₄, B₄'', B₄'''') are generated in a first approximation, have a location-dependency of the second order. A control device (8) of the magnetic resonance system, a, gradient (g *) and a correction volume (v) is predetermined. The control device (8) ..