Patent ID: 9389291
Filing Date: 2016-07-12
CPC Classification: G01R

Claim Text:
1. A gradient magnetic field coil, comprising: a plurality of first gradient coils in a tube shape disposed along an axial direction, the first gradient coils including at least one first main coil generating a linear magnetic field distribution in an image capturing region of a nuclear magnetic resonance imaging device, and at least one first shield coil disposed outside of the first main coil and inside a static magnetic field coil device that generates a static magnetic field with a uniform magnetic field distribution in the image capturing region, the at least one first shield coil reducing a leakage magnetic field from the first main coil to the static magnetic field coil device; and a plurality of second gradient coils in a tube shape disposed along the axial direction and inclined in a different direction than the first gradient coils, the second gradient coils including at least one second main coil generating a linear magnetic field distribution in the image capturing region of the nuclear magnetic resonance imaging device, and at least one second shield coil disposed outside the second main coil and inside the static magnetic field coil device that generates a static magnetic field with a uniform magnetic field distribution in the image capturing region, the at least one second shield coil reducing a leakage magnetic field that is from the second main coil to the static magnetic field coil device, wherein a cross-section, of at least one of the first shield coil and the second shield coil, perpendicular to the axial direction is substantially circular, wherein a cross-section, of at least one of the first main coil and the second main coil, perpendicular to the axial direction is not circular, and wherein a number of turns is different between the first main coil and the second main coil and/or a number of turns is different between the first shield coil and the second shield coil.