Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Reexamination Certificate
2006-01-24
2006-01-24
Shrivastav, Brij B. (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
C324S309000
Reexamination Certificate
active
06989672
ABSTRACT:
A method is disclosed for determining a gradient-induced cross-term magnetic field in a magnetic resonance imaging (MRI) system comprising: positioning an object in a static magnetic field; applying a radio frequency (RF) saturation pulse that spatially saturates nuclei of a slice of the object and applying an echo planar imaging (EPI) sequence to form an image of a slice of the object; generating a cross-field correction factor by analyzing the spatial distribution of the saturation line in the image.
REFERENCES:
patent: 4591789 (1986-05-01), Glover et al.
patent: 4849946 (1989-07-01), Beauducel
patent: 5151656 (1992-09-01), Maier et al.
patent: 5545995 (1996-08-01), Schneider et al.
patent: 5869965 (1999-02-01), Du et al.
patent: 6043651 (2000-03-01), Heid
patent: 6094049 (2000-07-01), Rosenfeld et al.
patent: 6263228 (2001-07-01), Zhang et al.
patent: 6329821 (2001-12-01), Zhou
patent: 6512372 (2003-01-01), Ikezaki
patent: 6836113 (2004-12-01), Zhang
“Concomitant Magnetic Field Gradients And Their Effects On Imaging At Low Magnetic Field Strengths”, David G. Norris et al,Magnetic Resonance Imaging, vol. 8, pp. 33-37, 1990.
“NMR Imaging For Magnets With Large Nonuniformities”, Kensuke Sekihara et al, pp. 193-199, 1985 IEEE.
“NMR Imaging In The Presence Of Magnetic Field Inhomogeneities And Gradient Field Nonlinearities”, M. O'Donnell et al., pp. 20-26, 1985 Am. Assoc. Phys. Med.
“A Technique For Accurate Magnetic resonance Imaging In The Presence Of Field Inhomogeneities”, Hsuan Chang et al., pp. 319-329, 1992 IEEE.
“Multi-Planar Image Formation Using NMR Spin Echoes”, P. Mansfield, pp. L55-L58, J. Phys. C: Solid State Phys., vol. 10, 1977.
“Biological And Medial Imaging By NMR”, P. Mansfield et al., pp. 355-373, Journal of Magnetic Resonance 29, (1978).
Nixon & Vanderhye P.C
Shrivastav Brij B.
Toshiba America MRI Inc.
LandOfFree
Measurement and correction of gradient-induced cross-term... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Measurement and correction of gradient-induced cross-term..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measurement and correction of gradient-induced cross-term... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3553833