Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Reexamination Certificate
2008-05-13
2008-05-13
Shrivastav, Brij (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
C324S318000, C324S314000, C324S313000
Reexamination Certificate
active
07372265
ABSTRACT:
A magnetic resonance imaging (MRI) system includes an examination volume (9), a main magnet system (17) for generating a main magnetic field (B0) in the examination volume, a gradient magnet system (25) for generating gradients of the main magnetic field, and a control system (37) for compensating disturbances of the magnetic field caused by mechanical vibrations of the MRI system. The control system is a feed-forward control system which determines a necessary compensation for said disturbances in dependence on an electric current in the gradient magnet system according to a predetermined response relation. Since in most MRI systems the mechanical vibrations are predominantly caused by the altering electric currents in the gradient magnet system and by eddy currents induced thereby, an accurate and reliable compensation for said disturbances is provided, so that artifacts and other distortions of the reconstructed image caused by said disturbances are considerably reduced.
REFERENCES:
patent: 4698591 (1987-10-01), Glover et al.
patent: 4965521 (1990-10-01), Egloff
patent: 5278503 (1994-01-01), Keller et al.
patent: 5332969 (1994-07-01), Tsuruno et al.
patent: 5545996 (1996-08-01), Morich et al.
patent: 5742164 (1998-04-01), Roemer et al.
patent: 6147494 (2000-11-01), Ham
patent: 6294913 (2001-09-01), Hinks et al.
patent: 6329821 (2001-12-01), Zhou
patent: 6380738 (2002-04-01), Zhou
patent: 6396268 (2002-05-01), Hinks et al.
patent: 6396272 (2002-05-01), Dietz et al.
patent: 6501275 (2002-12-01), Westphal
patent: 6504373 (2003-01-01), Tsuda
patent: 6515478 (2003-02-01), Wicklow et al.
patent: 6518761 (2003-02-01), Roozen et al.
patent: 6538443 (2003-03-01), Morich et al.
patent: 6549010 (2003-04-01), Roozen et al.
patent: 6567685 (2003-05-01), Takamori et al.
patent: 6694498 (2004-02-01), Conrad et al.
patent: 6864682 (2005-03-01), Fontius et al.
patent: 6954068 (2005-10-01), Takamori et al.
patent: 7034537 (2006-04-01), Tsuda et al.
patent: 2001/0010464 (2001-08-01), Takamori et al.
patent: 2001/0013778 (2001-08-01), Tsuda
patent: 2002/0079895 (2002-06-01), Roozen et al.
patent: 2002/0079896 (2002-06-01), Roozen et al.
patent: 2004/0032260 (2004-02-01), Fontius et al.
patent: 2004/0113616 (2004-06-01), Markl et al.
patent: 2004/0113620 (2004-06-01), Tsuda et al.
patent: 2004/0178792 (2004-09-01), Edelstein
patent: 2006/0076954 (2006-04-01), Kimmlingen et al.
patent: 2006/0145699 (2006-07-01), Ham et al.
patent: 0 533 173 (1993-03-01), None
patent: 1 054 263 (2000-11-01), None
patent: WO 2002/071942 (2002-09-01), None
patent: WO 93/14414 (1993-07-01), None
Mechefske, C.K., et al.; Characterization of Acoustic Noise and Magnetic Field Fluctuations in a 4T Whole Body MRI Scanner; 2002; Mechanical Systems and Signal Processing: 16(2-3): 459-473.
Groen Johannes Petrus
Ham Cornelis Leonardus Gerardus
Mens Wilhelmus Reinerius Maria
Fetzner Tiffany A.
Koninklijke Philips Electronics , N.V.
Shrivastav Brij
LandOfFree
Compensation of magnetic field disturbances due to... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Compensation of magnetic field disturbances due to..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compensation of magnetic field disturbances due to... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2802231