04743880 is referenced by 15 patents and cites 7 patents.

A magnet system for providing a localized, substantially homogeneous field for use in medical magnetic resonance imaging and its incorporation into a method of siting. The magnet system includes a vacuum vessel defining a bore for receiving the subject of the imaging and having a first end and a second end. A cryogenic containment vessel is supported within the vacuum vessel and a single coil is disposed within the containment vessel for providing the magnetic field. The magnetic system also includes a shield assembly of ferromagnetic material positioned closely adjacent the outside of the vacuum vessel and including first and second end assemblies and a plurality of axially extending beam-like members interconnecting the end assemblies. The coil comprises a winding made up of thousands of turns of small superconductive wire and which is configured to compensate for the effect of the presence of the shield to provide the substantially homogeneous field at a predetermined location in the bore. The components of the shield assembly are adapted for mounting to said vacuum vessel after siting. This permits simplified siting of the magnet system in that the vacuum vessel with the components inside of it can be sited first and the components of the shield assembly thereafter mounted on the vacuum vessel. A method of manufacturing the magnet system is also disclosed.

Title
MRI magnet system having shield and method of manufacture
Application Number
7/101518
Publication Number
4743880
Application Date
September 28, 1987
Publication Date
May 10, 1988
Inventor
Sibley C Burnett
Cardiff
CA, US
John R Purcell
San Diego
CA, US
Bruce C Breneman
San Diego
CA, US
Agent
Fitch Even Tabin & Flannery
Assignee
GA Technologies
CA, US
IPC
H01F 7/00
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