Method and System for Generating Magnetic Field Gradients for an NMR Imaging Machine

摘要

Disclosed is a gradient generator system arranged around a volume of interest of axis Oz. The system includes z-gradient coils of axis Oz; z-gradient tubes of axes parallel to the axis Oz including coils arranged in a ring outside the z-gradient coils; x-gradient coils and y-gradient coils of saddle shape arranged around the z-gradient coils; and x and y-gradient tubes of axes parallel to the axis Oz and situated in a ring outside the z-gradient coils, being interposed between the z-gradient tubes, with each of the x and y gradient tubes including coils.

主权项

1. A magnetic field gradient generator system arranged around a volume of interest of axis Oz in a nuclear resonance imaging machine, the system comprising at least solenoidal z-gradient first and second coils of axis Oz carrying currents in opposite directions; a set of identical z-gradient first tubes of axes parallel to the axis Oz, each comprising at least solenoidal third and fourth coils carrying currents in opposite directions and arranged in a ring outside the z-gradient first and second coils; at least x-gradient fifth to eighth coils of saddle shape and y-gradient ninth to twelfth coils of saddle shape arranged around the z-gradient first and second coils; a set of identical x and y-gradient second tubes of axes parallel to the axis Oz and situated in a ring outside the z-gradient first and second coils, being interposed between the z-gradient first tubes in the same ring, each of the x and y-gradient second tubes comprising at least solenoidal thirteenth and fourteenth coils carrying currents in opposite directions, the x and y directions being mutually orthogonal and orthogonal to the axis Oz.