Gradient coil device and magnetic resonance imaging device

摘要

A gradient coil device includes a major axis gradient coil, having an ellipse in a cross section generating a gradient magnetic field inclined in a major axis direction of the ellipse at a magnetic field space; and a minor axis gradient coil, having an ellipse in a cross section generating a gradient magnetic field inclined in a minor axis direction of the ellipse at the magnetic field space. A length of the minor axis field coil in the center axis direction is shorter than a length of the major axis gradient coil in the center axis direction. A maximum value of a residual magnetic field generated by the minor axis gradient coil at a space outside the magnetic field space is equal to or smaller than a maximum value of a residual magnetic field generated by the major axis gradient coil at a space outside the magnetic field space.

主权项

1. A gradient coil device comprising:
a major axis gradient coil, having a cross section shape vertical to a center axis direction which is an ellipse, configured to generate a gradient magnetic field having a magnetic field intensity inclined in a major axis direction of the ellipse at a magnetic field space; and a minor axis gradient coil, having a cross section shape vertical to the center axis direction which is an ellipse, configured to generate a gradient magnetic field having a magnetic field intensity inclined in a minor axis direction of the ellipse at the magnetic field space, wherein the length (Lmy) of the minor axis gradient coil in the center axis direction is shorter than the length (Lmx) of the major axis gradient coil in the center axis direction.