Hitachi, Ltd.

Hitachi Engineering Services Co., Ltd.

Hitachi Medical Corporation

Hitachi Kyowa Engineering Co., Ltd.

Tomoo Chiba

Hiroshi Morita

Michiya Okada

Tsuyoshi Wakuda

Kohji Maki

Mitsushi Abe

Hiroyuki Watanabe

Hideo Tsukamoto

Tomomi Kikuta

Shuichi Kido

Kunihiro Takayama

Jun Kawamura

Takeshi Nakayama

Hiroyuki Takeuchi

Hirotaka Takeshima

Tsutomu Yamamoto

Takeo Nemoto

Ryuya Ando

Miki Yamazaki

Teruhiro Takizawa

Shigeki Tounosu

Yoshio Hamadate

Jun Yokoyama

A superconducting magnet apparatus obtains high magnetic field uniformity without increasing the volume of a magnetic material even against disturbances. The superconducting magnet apparatus has a circular superconducting coil which generates a magnetic field; a coil vessel which contains the superconducting coiltogether with refrigerant; a thermal shield arranged so as to surround the coil vessel; a vacuum vessel with inside kept vacuum which surrounds the thermal-shield; and magnetic materials and for correcting the magnetic field, the magnetic materials being arranged in the vacuum vessel; wherein the magnetic materials and are supported by a heat-insulation support medium fixed to the coil vessel.

Superconducting magnet apparatus and magnetic resonance imaging apparatus

In a superconducting magnet, including a vacuum vessel, a coil vessel inside the vacuum vessel, and a superconducting coil inside the coil vessel for generating a magnetic field, has a magnetic member, disposed inside the vacuum vessel, supported with thermal insulation, for compensating the magnetic field; a heat exchange device disposed outside the vacuum vessel for supplying to or absorbing heat from the vacuum vessel; and thermal conducting members thermally connecting the heat exchange device via the vacuum vessel to the magnetic member. An MRI including the superconducting magnet is also disclosed.

Superconducting magnet and magnetic resonance imaging apparatus

A superconducting magnet includes: first and second torus coolant containers substantially symmetrically, vertically arranged to have a space and a symmetrical plane therebetween for storing a coolant. Each of the first and second torus coolant containers includes therein a main coil bobbin with a main coil for generating a measurement magnetic field, a shield coil bobbin with a shield coil for generating a shielding magnetic field for suppressing outside leak of the measurement magnetic field, a plate member vertically reinforced at a plane thereof opposite to a plane thereof facing the symmetrical plane for supporting the shield coil bobbin and the main coil bobbin. The main coil bobbin is further supported by the shield coil bobbin, to cause the main coil to generate the measurement magnetic field having a substantially uniform magnetic field intensity at a middle region of the space. A magnetic resonance imaging apparatus using the superconducting magnet is also disclosed.

Superconducting magnet and magnetic resonance imaging apparatus using the same

A superconducting magnet includes: a superconducting coil for generating a static magnetic field; a refrigerant container for containing the superconducting coil and a refrigerant; a vacuum container for holding the refrigerant container in a vacuum state; a radiation shield between the refrigerant container and the vacuum container; a refrigerator for re-liquidfying the refrigerant; and a dynamic magnetic field shield. The refrigerator includes: first and second regenerative refrigerants. The dynamic magnetic field shield is an electric good conductor and arranged around the first regenerative refrigerant along a motion axis of the first regenerative refrigerant, wherein a direction of the motion axis is aligned with a direction of a magnetic force line of the static magnetic field at the first regenerative refrigerant.

Superconducting magnet with refrigerator and magnetic resonance imaging apparatus using the same

A superconductive magnet device includes: a pair of coil vessels configured to house a plurality of superconductive coils formed circularly, together with a refrigerant; a pair of vacuum vessels configured to house the coil vessels in the vacuum vessels, respectively; a pair of supports configured to connect the vacuum vessels to each other in a state of the vacuum vessels being faced to each other in an up and down direction, wherein a space between the vacuum vessels is made into a uniform magnetic field space; and a refrigerator and a power lead port configured to be provided at an upper portion of one vacuum vessel positioned upper than the other out of the vacuum vessels, wherein the refrigerator is disposed above one support out of the supports, and the power lead port is disposed above the other support different from the one support.

Superconductive magnet device and magnetic resonance imaging apparatus

A magnet for an NMR analyzer includes a superconductor coil for generating a magnetic field in a magnetic space surrounded by the superconductor coil. The superconductor coil has a shim coil group disposed at least one of inside and outside of the superconducting coil. The superconducting coil provides a first access port for receiving a probe inserted into the magnetic space along a central axis thereof and a second access port having one end for receiving a sample tube containing a sample inserted into the magnetic space in a direction transverse to the central axis of the magnetic space. The second access port is open at an other end thereof.

Magnet for NMR analyzer and NMR analyzer using the same

A magnet for an NMR an analyzer includes a superconductor coil which is operated under a permanent current mode so as to generate a magnetic field in a space surrounded by the superconductor coil, and which enables a sample to be inserted into a measurement space in the magnetic space for analization. The superconductor coil includes a first access port for enabling access to the measurement space and a second access port for enabling insertion of the sample into the measurement space in a direction different from a direction of the first access port. An effective diameter of the first access port is larger than an effective diameter of the second access port when the effective diameters of the first and second access ports are defined as a diameter of a cylinder that is insertable into the first and second access ports.

To access a measurement space located at the center of the magnet, an access port is provided in the direction of the magnet's axis, a clearance is provided in the coil winding portion, and another access port passes through the clearance so that a sample can be positioned perpendicularly to the coil axis. According to this configuration, an access port passing through the coil winding portion can be smaller than the access port passing through the coil axis, a sample is inserted from the access port, and a probe is inserted from the access port passing through the magnet axis, and thus the clearance can be minimized.

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Hitachi, Japan

Tomoo Chiba