Hitachi, Ltd.

Hitachi Cable, Inc.

Shohei Suzuki

Koji Noguchi

Goh Miyajima

Tuyosi Shudo

Takao Takahashi

Shuji Sakai

Yoshiaki Kazawa

Hidezumi Moriai

Ryusei Saito

Ryoichi Mashiko

A magnetic field gradient coil system for use in a magnetic resonance imaging apparatus forming a magnetic field gradient in a direction of a Z-axis of an X, Y, Z orthogonal coordinate system having its origin at a selected position in the imaging apparatus comprises one pair of first coils and one pair of second coils having their centers on the Z-axis and having the same radius, the coils of each coil pair disposed symmetrically with respect to an XY plane including the origin, the coils of the second coil pair disposed more distant from the origin than the coils of the first coil pair, the coils of the first and second coil pairs disposed on one side of the origin supplied with current in the same direction, the coils disposed on the other side of the origin supplied with current opposite to the direction of current in the coils on the one side of the origin, each of the coils of the first coil pair disposed where the value of the Z-axis magnetic field component of first order at a selected position on the Z-axis becomes substantially maximum, and the ampere-turn and position of each of the coils of the second coil pair selected so that, at the selected position, the Z-axis magnetic field components of third and fifth orders provided by the second coil pair have values which can substantially cancel the Z-axis magnetic field components of third and fifth orders provided by the first coil pair.

Magnetic field gradient coil system

A superconductor which includes a housing of a highly pure copper having a slot therein for accommodating a plurality of monolithic superconductor members and a reinforcing member. A highly pure aluminum lid or cover is adapted to be disposed in an opening of the slot, with outer surfaces of the lid or cover having arranged thereon highly pure copper. The lid or cover, the monolithic superconductor members, the reinforcing member, and the housing are integrated and bonded together by a bonding material such as, for example, solder.

Integrated superconductor

Growing community of inventors

Takahagi, Japan

Shohei Suzuki