Magnetic resonance spectroscopy method and apparatus for perform

Details Magnetic resonance spectroscopy method and apparatus for perform Magnetic resonance spectroscopy method and apparatus for perform

1990-08-03

1992-05-05

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324309, 324300, G01R 3320

Patent

active

051111438

ABSTRACT:
A magnetic resonance spectroscopy method, and apparatus for performing the method, where a plurality of sequences act on an examination zone in the presence of a uniform, steady magnetic field, each sequence comprising at least three RF pulses, the distance between the first two RF pulses being equal to the reciprocal value of twice the scalar coupling constant J, between and after the pulses there being applied magnetic gradient fields having an amplitude and a duration such that the spin resonance signals occurring after the third RF pulse are determined exclusively by double quantum coherence. In order to suppress the fat component situated in the immediate vicinity of the lactate component of lower Larmor frequency, the lipid component at the area of the lactate component is reduced by making the second and/or the third RF pulse frequency-selective so that it acts as an 90.degree. pulse for the component coupled to the lactate component and as a 0.degree. pulse or 180.degree. pulse for the component coupled to the lipid component.

REFERENCES:
patent: 4868503 (1989-09-01), McKinnon et al.
patent: 4918387 (1990-04-01), McKinnon et al.
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.

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