Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1992-05-12
1994-05-31
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01V 300
Patent
active
053172612
ABSTRACT:
A volume-selective magnetic resonance method for the determination of an MRI spectrum MR image, comprises a 90.degree. excitation pulse (p.sub.0) followed by two 180.degree. pulses (p.sub.1, p.sub.2,) the pulses (p.sub.0, p.sub.1, p.sub.2) being slice-selective. The magnetic resonance signal (SE) is sampled in the absence of magnetic field gradients and a spectrum is determined by way of Fourier transformation.
In comparatively simple spin systems, J-refocusing is achieved for a specific choice of the echo time (TE), while only one J-coupling of more complex spin systems, comprising more than on J-coupling, is refocused by a specific choice of the echo time (TE).
The method in accordance with the invention applies either a chemically selective 180.degree. pulse (p.sub.3) or a broadband 90.degree. pulse (p.sub.4) between the 180.degree. pulses (p.sub.1, p.sub.2). This causes J-refocusing to then occur, regardless the selected echo time (TE).
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Journal of Magnetic Resonance 59, (1984) "Highly Selective .pi./2 and .pi. Pulse Generation" Silver et al, pp. 347-351 (no month).
Journal of Magnetic Resonance 84, (1989) "A Perfect Spin Echo in a Weakly Homonuclear J-Coupled Two Spin 1/2 System" Takegoshi et al pp. 611-615 (no month).
"Nuclear Magnetic Resonance Spectroscopy" R. K. Harris, (1987) "The Fundamentals" pp. 1-35 (no month).
Den Hollander Jan A.
Luyten Peter R.
Van Stapele Reurt P.
Arana Louis
Slobod Jack D.
U.S. Philips Corporation
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