Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1989-09-13
1991-01-29
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
G01R 3320
Patent
active
049889478
ABSTRACT:
Two amplitude/frequency/phase modulated pulses that can achieve 90.degree. plane rotations over large B.sub.1 field inhomogeneities are described. The pulses achieve this by use of a "flip" in the direction of the effective B.sub.1 field half-way through the pulse, and by use of a discontinuous phase jump in addition to continuous frequency of phase modulation. These pulse can be used for rotation of magnetization vectors between any plane that is perpendicular to the transverse plane and the transverse plane of the rotating reference frame. Consequently, then can be used for interchanging amplitude and phase information and converting amplitude modulated rotating frame experiments into phase modulated experiments.
REFERENCES:
patent: 3723856 (1973-03-01), Brown
patent: 4390840 (1983-06-01), Ganssen et al.
patent: 4480228 (1984-10-01), Bottomley
patent: 4486709 (1984-12-01), Bendall
patent: 4528508 (1985-07-01), Vail, III
patent: 4535290 (1985-08-01), Post et al.
patent: 4551680 (1985-11-01), Mackovski
patent: 4613949, Glover et al.
patent: 4695799 (1987-09-01), Hardy et al.
patent: 4774466 (1988-09-01), Sattin
patent: 4820983 (1989-04-01), Bendall
patent: 4868501 (1989-09-01), Conolly
"Spatial Localization of Tissue Metabolites by Phosphorus-31 NMR Rotating Frame Zeugmatography", M. Garwood, et al., Journal of Magnetic Resonance, vol. 60, pp. 268-279 (1984).
"A Modified Rotating Frame Experiment Based on a Fourier Series Window Function. Application to in Vivo Spatially Localized NMR Spectroscopy", M. Garwood, et al., Journal of Magnetic Resonance, vol. 65, pp. 239-251 (1985).
"Use of Amplitude/Phase/Frequency Modulated Pulses with Highly Inhomogeneous B.sub.1 Fields to Conduct Phase-Modulated Rotating Frame Experiments", K. Ugurbil, et al., Society of Magnetic Resonance in Medicine, 1986 Abstract for Scientific Papers and Posters, Works in Progess #098, Aug. 18, 1986.
"Improved Fourier Series Windows for Localization in Vivo NMR Spectroscopy", M. Garwood, et al., Journal of Magnetic Resonance, vol. 65, pp. 510-515 (1985).
"Amplitude and Frequency Modulated Pulses to Achieve 90.degree. Plane Rotations with Inhomogeneous B.sub.1 Fields", K. Ugurbil, et al., Journal of Magnetic Resonance, vol. 72, pp. 177-185 (Mar. 1987).
"Communications: Adiabatic Refocusing Pulse Which Compensates for Variable Power and Off-Resonance Effects", M. Bendall, et al., Magnetic Resonance in Medicine, vol. 4, pp. 493-499 (May 1987).
"Rotating Frame Zeugmatography", D. I. Hoult, Journal of Magnetic Resonance, vol. 33, pp. 183-197 (1979).
"Principals of Magnetic Resonance", C. P. Slichter, 2nd Ed., p. 24, Springer-Verlag, Berlin/New York, 1979.
"Mapping of Metabolites in Whole Animals by .sup.31 P NMR Using Surface Coils", Joseph J. H. Ackerman et al., Nature, vol. 283, pp. 167-170 (Jan. 10, 1980).
"Communications: Toward Biochemical Imaging", S. J. Cox, et al., Journal of Magnetics Resonance, vol. 40, pp. 209-212 (1980).
"Broadband Population Inversion by Phase Modulated Pulses", J. Baum, et al., Journal of Chemical Physics, vol. 79, p. 4643 (1983).
"Spatial Localization of High Resolution .sup.31 P Spectra with a Surface Coil", Axel Haase et al., Journal of Magnetic Resonance, vol. 55, pp. 164-169 (1983).
"Solvent Suppression in Fourier Transform Nuclear Magnetic Resonance", P. J. Hore, Journal of Magnetic Resonance, vol. 55, p. 383 (1983).
"Volume-Selective Excitation, A Novel Approach to Topical NMR", W. P. Aue, et al., Journal of Magnetic Resonance, vol. 56, pp. 350-354 (1984).
"Depth-Resolved Surface-Coil Spectroscopy (DRESS) for in Vivo .sup.1 H, .sup.31 P, and .sup.13 C NMR", Paul A. Bottomley, et al., Journal of Magnetic Resonance, vol. 59, pp. 338-342 (1984).
"Selective Spin Inversion in Nuclear Magnetic Resonance and Coherent Optics Through and Exact So
This invention was made with Government support under Grant No. HL 33600 awarded by NIH. The Government has certain rights in the invention.
Garwood Michael
Ugurbil Kamil
Regents of the University of Minnesota
Tokar Michael J.
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