Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Reexamination Certificate
2006-05-30
2006-05-30
Gutierrez, Diego (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
Reexamination Certificate
active
07053612
ABSTRACT:
A method of estimating the spatial variation in RF signal intensity within magnetic resonance images of an object is described. The estimate can be used to provide enhanced contrast in a magnetic resonance image by correcting for spatial variation in RF intensities arising from non-uniformities in RF receiving coils of an MRI machine acquiring the image as well as distortions arising from the object and observation itself. This is achieved through compound imaging of a medium of essentially uniform spin density surrounding the object. From analysis of the surrounding medium, and the location of notional points of RF signal reception, a semi-empirical mathematical formulation of the decay profile of the RF signal intensity within the object is determined. This is then fitted to selected signal intensities from the medium surrounding the object to obtain an estimate of the spatial variation in RF signal intensity within the object.
REFERENCES:
patent: 5509412 (1996-04-01), Bahn
patent: 6445183 (2002-09-01), Shimizu et al.
patent: 6453187 (2002-09-01), Prince et al.
patent: 6545472 (2003-04-01), Prussmann et al.
patent: 6546274 (2003-04-01), Itagaki et al.
patent: 2001/0018559 (2001-08-01), Itagaki et al.
patent: 0208 522 (1990-02-01), None
Sled, J.G., et al.; “Standing-Wave and RF Penetration Artifacts Caused by Elliptic Geometry: An Electrodynamic Analysis of MRI”; IEEE Transactions on Medical Imaging; vol. 17, No. 4, 1998; pp. 653-662.
Zhou, L.G., et al.; “A Method of Radio-Frequency Inhomogeneity Correction for Brain Tissue Segmentation in MRI”; Computerized Medical Imaging and Graphics; vol. 25, Sep.-Oct. 2001; pp. 379-389.
Dawant, B.M., et al.; “Correction of Intensity Variations in MR Images for Computer-Aided Tissue Classification”, IEEE Transactions on Medical Imaging; vol. 12, No. 4, Dec. 1993; pp. 770-781.
Clark Paul
St. Pierre Tim
Edell Shapiro & Finnan LLC
Gutierrez Diego
Inner Vision Biometrics Pty Ltd.
Vargas Dixomara
LandOfFree
Method of estimating the spatial variation of magnetic... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of estimating the spatial variation of magnetic..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of estimating the spatial variation of magnetic... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3605141