Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1998-11-13
2000-07-18
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324309, G01V 300
Patent
active
06091243&
ABSTRACT:
A method acquires three complex images, wherein their respective phase differences between water and fat components are .alpha..sub.0, .alpha..sub.0 +.alpha., and .alpha..sub.0 +2.alpha., respectively. The method obtains from these three complex images two possible solution sets for water and fat images. For pixels with both water and fat components, one correct solution set is selected using a binary choice based on the relative Larmor frequencies of water and fat. If a pixel contains only one component, a known statistical bias is applied to identify the component and, thus, the pixel. To correct misidentified pixels, various filters may be applied to all the pixels. The water and fat solutions obtained from the three complex images are used to produce separate images of water and fat. Second pass solutions of water and fat with improved signal-to-noise ratio can be obtained by either averaging or a least square error method.
REFERENCES:
patent: 5134372 (1992-07-01), Inoue
patent: 5144235 (1992-09-01), Glover et al.
patent: 5162737 (1992-11-01), Nozokido et al.
patent: 5225781 (1993-07-01), Glover et al.
patent: 5321359 (1994-06-01), Schneider
Anh, C.B., "A New Phase Correction Method in NMR Imaging Based on Autocorrelation and Histogram Analysis," IEEE Transactions on Medical Imaging, vol. MI-6, No. 1, Mar. 1987, pp. 32-36.
An, Li, et al., "Quadrature 2-Point Water-Fat Imaging," Proceedings of the Fourth Annual Scientific Meeting of the Society of Magnetic Resonance, New York, NY, Apr. 27-May 3, 1996.
Dixon, W.T., "Simple Proton Spectroscopic Imaging," Radiology, vol. 153, Oct. 1984, pp. 180-184.
Gao, J.H., et al., "Effects on Selective Excitation and Phase Uniformity of Orthogonal Field Gradient Components," Proceedings of the Tenth Annual Scientific Meeting of the Society for Magnetic Resonance in Medicine, 1991, p. 132.
Glover, G.H., "Multipoint Dixon Technique for Water and Fat Proton and Susceptibility Imaging," JMRI, vol. 1, No. 5, Sep./Oct. 1991, pp. 521-530.
Glover, G.H., et al., "Three-Point Dixon Technique for True Water/Fat Decomposition with B.sub.0 Inhomogeneity Correction," Magnetic Resonance in Medicine, vol. 18, 1991, pp. 371-383.
Graham, S.J., et al., "Changes in Fibroglandular Volume and Water Content of Breast Tissue During the Menstrual Cycle Observed by MR Imaging at 1.5 T," JMRI, vol. 5, Nov./Dec. 1995, pp. 695-701.
Hardy, P.A., et al., "Separation of Fat and Water in Fast Spin-Echo MR Imaging with the Three-Point Dixon Technique," JMRI, vol. 5,Mar./Apr. 1995, pp. 181-185.
Judge, T.R., et al., "A Review of Phase Unwrapping Techniques in Fringe Analysis," Optics and Lasers in Engineering, vol. 21, 1994, pp. 199-239.
Lodes, C.C., et al., "Proton MR Chemical Shift Imaging Using Double and Triple Phase Contrast Acquisition Methods," Journal of Computer Assisted Tomography, vol. 13, Nov. 5, Sep./Oct. 1989, pp. 855-861.
Riek, J.K., et al., "Flow Compensation in MRI Using a Phase-Corrected Real Reconstruction," MRM, vol. 30, 1993, pp. 724-731.
Skinner, T.E., et al., "An Extended Two-Point Dixon Algorithm for Calculating Separate Water, Fat, and B.sub.0 Images," MRM, vol. 37, 1997, pp. 628-630.
Szumowski, J., et al., "Double-Echo Three-Point-Dixon Method for Fat Suppression MRI," MRM, vol. 34, 1995, pp. 120-124.
Szumowski, J., et al., "Phase Unwrapping in the Three-Point Dixon Method for Fat Suppression MR Imaging," Radiology, vol. 192, Aug. 1994, pp. 555-561.
Towers, D.P., et al., "Automatic Interferogram Analysis Techniques Applied to Quasi-Heterodyne Holography and ESPI," Optics and Lasers in Engineering, vol. 14, 1991, pp. 239-281.
Williams, S.C.R., et al., "True Water and Fat MR Imaging with Use of Multiple-Echo Acquisition," Radiology, vol. 173, 1989, pp. 249-253.
Xiang, Q.-S., et al., Weighted Average and its Application in Ghost Artifact Reduction, JMRI, Mar./Apr. 1991, p. 222.
Xiang, Q.-S., et al., "General 3-Point Water-Fat Imaging with Optimized SNR," Proceedings of the Fourth Annual Scientific Meeting of the Society of Magnetic Resonance, New York, NY, Apr. 27-May 3, 1996, p. 1544.
Xiang, Q.-S., et al., "Water-Fat Imaging with Three-Point Direct Phase Encoding," Proceedings of the Third Scientific Meeting of the Society of Magnetic Resonance, Nice, France, Aug. 19-25, 1995, p. 658.
Yeung, H.N., et al., "Separation of True Fat and Water Images by Correcting Magnetic Field Inhomogeneity in Situ," Radiology, vol. 159, Jun. 1986, pp. 783-786.
Yeung, H.N., et al., "Single-Acquisition Chemical-Shift Imaging of a Binary System with Use of Stimulated Echoes," Radiology, vol. 167, May 1988, pp. 537I-540.
Zhu, G., et al., "A Robust Water and Fat Separation Method," Proceedings of the Fourth Annual Scientific Meeting of the Society of Magentic Resonance, New York, NY, Apr. 27-May 3, 1996, p. 1542.
An Li
Xiang Qing-San
Arana Louis
The University of British Columbia
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