Patent · US Active

Magnetic field generating apparatus for magnetic resonance imaging

US7439836B2 · kind B2 · utility

2Cited by

8References

21Claims

0Family size

Assignee

General Electric Company · US

Inventors

Yuri Lvovsky · Florence, US
Michael Sellers · Erlangen, DE
Timothy John Havens · Florence, US

Key dates

Filing date	Dec 28, 2005
Grant date	Oct 21, 2008
Priority date	—
Expiry date	Apr 23, 2027

Classification

Technology area (CPC H)Electricity
CPC primaryH01F6/00
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A Magnetic Resonance Imaging (MRI) system is disclosed. The MRI system includes a cryogenic magnet assembly with a cryogenic vessel housing a superconducting magnet. Disposed radially inboard of the cryogenic magnet assembly are a gradient coil module and a plurality of room temperature steel rings proximate to the gradient coil module. A field of view is defined by at least the superconducting magnet, the gradient coil module, and the plurality of room temperature steel rings. In response to the superconducting magnet being energized, the room temperature steel rings create high order harmonics that serve to expand the magnetic field homogeneity FOV, and low order harmonics that tend to degrade the magnetic field homogeneity within the FOV. The low order harmonics are compensated for by the cryogenic magnet assembly.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.