Magnetic resonance method for obtaining selected spectra

Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system

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324309, G01R 3320

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049721470

ABSTRACT:
The method includes a critical time shift of a refocusing pulse between two (90.degree.) excitation pulses which produce multiple quantum coherence signals and which are followed by a (90.degree.) read pulse (using a critical timing a refocusing pulse serving the same purpose can also be applied between the second excitation pulse and the read pulse). With respect to the center of the time path between the excitation pulses or between the excitation pulse and the read pulse the time shift is chosen to be such that give resonances do not occur positively or negatively in the spectrum whereas other resonances do occur therein (i.e. at substantially maximum strength). The MRI method can be combined with the use of spatially selective gradients in order to obtain localized spectra or images.

REFERENCES:
patent: 4510449 (1985-04-01), Ernst et al.
patent: 4680546 (1987-07-01), Dumoulin
patent: 4789832 (1988-12-01), Nagayama
A. Bax et al., "Separation of the Different Orders of NMR Multiple-Quantum Transitions by the Use of Pulsed Field Gradients", Chemical Physics Letters, vol. 69, No. 3, Feb. 1, 1980, pp. 567-570.
C. H. Sotak, "A Volume-Localized,, Two-Dimensional NMR Method for the Determination of Lactate Using Zero-Quantum Coherence Created in a Stimulated Echo Pulse Sequence", Magnetic Resonance in Medicine, vol. 7, No. 3, Jul. 1988, 364-370.

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