Hitachi, Ltd.

Hitachi Medical Corporation

Nobuhiro Hara

Noriaki Hino

Shigeru Kakugawa

Hajime Kawano

Hirotaka Takeshima

Takao Honmei

Akiyoshi Komura

Takeshi Yatsuo

Katsuzo Aihara

Naofumi Tada

Naoki Maki

Hiroshi Tazaki

Shouji Kitamura

Hiroshi Kimura

Tomoichi Kamo

Kenichi Hattori

Yasuo Suzuki

Masayuki Shibata

Toshiya Doi

Kazuhisa Mori

Masahiro Ogihara

Yutaka Takuma

Yoshiji Hotta

Kunishige Kuroda

Takesi Ozawa

Munenori Kotabe

Katsuo Kouriki

A magnet device includes two sets of static magnetic field generation sources spaced from each other in the vertical direction such that the uniform magnetic field region (patient space) is between then. Each set has concentric current carrying coils to generate a uniform magnetic field in a first direction (the vertical direction). Several such coils are used in each set, disposed such that when a first axis which is parallel to the first (vertical) direction and passes substantially through the centers of the current carrying coils crosses, at a first point, a second axis which is orthogonal to the first axis and is at substantially equal distance from the respective static magnetic field generation sources, the current carrying coils are disposed in such a manner that when geometrical centers of cross sections of the current carrying coils are projected on a first straight line that is in a first plane containing the first axis, the second axis and the first point and passing through the first point, the directions of the currents of the carrying coils at the respective corresponding projections align alternatively in positive and negative directions on the first straight line.

Magnet apparatus and mri apparatus

Open MRI system with a vertical static field and an imaging volume closer to the lower than to the upper magnet assembly

Superconducting magnet apparatus and method of regulating magnetization

A laminated superconducting magnet includes a multilayer short-circuit superconductor group 2 formed by uniting superposed hollow superconducting plates, and an exciting coil 3 for inducing a current from an external power source 4 to the multilayer short-circuit superconductor group 2 for operation in a permanent current mode. Even if some of the superconducting plates are quenched, the other normal superconducting plates share the excess current temporarily. Therefore, the entire superconducting magnet is not quenched.

Superconducting magnet formed by laminating hollow conductor plates

Superconducting magnet system using a liquid helium for its operation and a permanent current switch and a system thereof applied to the superconducting magnet system employing a permanent current loop created by a superconducting material developing superconductivity when cooled. The system includes a superconducting magnet dipped in the liquid helium, the permanent current switch for driving or interrupting the superconducting magnet, and a cryostat for accommodating the superconducting magnet and the permanent current switch, and the permanent current switch is arranged over a liquid surface of the liquid helium.

Permanent current switch and superconducting magnet system

In a superconducting switching device including a switching member comprising a superconducting wire, and a magnetic field generation section for controlling superconducting-normal conducting transition caused in the switching member, the switching member comprises an oxide superconductor having a high critical temperature and having a large electric resistivity value under the normal conductive state.

Superconducting switching device

In a forced flow cooling-type superconducting coil apparatus including a superconducting coil having superconducting wires inserted into a hollow conduit, current leads for supplying a current to said superconducting coil, and cooling means for cooling said superconducting wires by forcibly flowing the coolant through said hollow conduit, a part of the coolant flowing through said cooling means is branched to cool said current leads.

Forced flow cooling-type superconducting coil apparatus

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Hitachi, Japan

Nobuhiro Hara