Back to results
US 7,126,448 B2Granted
Superconducting magnet apparatus and magnetic resonance imaging apparatus using the same
AssigneesHitachi, Ltd., Hitachi Engineering Co., Ltd.
InventorsHiroyuki Watanabe, Masanori Takahashi, Mitsushi Abe, Jun Kawamura
Life of this patent
Estimating the term…
Abstract
An MRI apparatus includes magnet members for compensating the magnetic field which are disposed to a thermal shield system of the superconducting apparatus. The magnet members for compensating the magnetic field are disposed at positions where temperature change in the vacuum chamber is not transferred to the interior of the vacuum chamber.
Claims7
A superconducting magnet apparatus comprising annular superconducting coils;
- coil containers for accommodating the annual superconducting coils together with a coolant;
- thermal shields so disposed as to surround the coil containers;
- and a vacuum chamber(s) surrounding the coil containers and the thermal shields surrounding the coil containers, the interior of the vacuum chamber being kept under a vacuum;
- wherein the coil containers are so arranged as to oppose each other to form a magnetic space there between, and wherein magnetic members for compensating a magnetic field in the magnetic space are disposed to thermal shields separated from the thermal shields surrounding the coil containers.
1 more element
A superconducting magnet apparatus comprising annular superconducting coils;
- coil containers for accommodating the superconducting coils together with a coolant;
- thermal shields so disposed as to surround the coil containers;
- and a vacuum chamber surrounding the coil containers and the thermal shields surrounding the coil containers, the interior of the vacuum chamber being kept under a vacuum, wherein coil containers are disposed to oppose each other to form a magnetic field therebetween, wherein annular magnetic members for compensating a magnetic field in a magnetic space between the coil containers are disposed outside the coil containers but in the vacuum chambers, and wherein the annular magnetic members are supported by supporting members, which are made of thermal insulating material.
Dependencies are inferred from the claim text.