SUPERCONDUCTING MAGNET DEVICE AND MAGNETIC RESONANCE IMAGING SYSTEM EMPLOYING IT

WIPO Patent Application WO/2004/037081

A1

A high magnetic field open type MRI system realizing safety operation of a superconducting magnet by suppressing electromagnetic interference of a gradient field coil and a high frequency field coil with a superconducting coil. In a static field generating magnet (102), a pair of cryostats (117) are coupled through a coupling tube (201) and disposed above and below a space (118) where a subject is placed while housing a superconducting coil (204) in containers (202, 203) filled with helium. The cryostat (117) is attached with an emergency demagnetization unit (120) for demagnetizing the field, and a measuring unit (121) for monitoring the liquid level of helium, and their signal cables are connected with the internal circuit of the static field generating magnet (102) through a filter circuit (122). Even if the gradient field coil or the high frequency field coil of the MRI system is driven, a high frequency current being induced is interrupted by the filter circuit (122) and flows through the outer case of the cryostat (117) to a ground point (123) without having any effect on the internal circuit of the cryostat (117).

TSUDA MUNETAKA (JP)
TAKEUCHI HIROYUKI (JP)
SAKAMOTO ISAO (JP)

PCT/JP2003/011678

May 06, 2004

September 12, 2003

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HITACHI MEDICAL CORP (JP)
TSUDA MUNETAKA (JP)
TAKEUCHI HIROYUKI (JP)
SAKAMOTO ISAO (JP)

A61B5/055; G01R33/3815; H01F7/20; (IPC1-7): A61B5/055; G01R33/3815

JPH08504107A	1996-05-07
JPH01117004A	1989-05-09
JPH09224919A	1997-09-02
JPH01126956A	1989-05-19
JPS6388810A	1988-04-19
JP2002209869A	2002-07-30
JP2002143126A	2002-05-21
JPS63278310A	1988-11-16
JPH1116718A	1999-01-22

Ozawa, Keinosuke (25 Ichiban-ch, Chiyoda-ku Tokyo, JP)

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