Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1992-03-30
1993-05-25
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324309, G01V 300
Patent
active
052143813
ABSTRACT:
In an NMR spectrometer, nuclear spins are subjected to a radio-frequency (RF) pulse sequence consisting of repeating cycles, each having a first and a second pulse set. The first pulse set generates a first large-amplitude rotation of the spins in which the angle through which the spins rotate varies with RF field strength. The second pulse set generates a second rotation which has an axis orthogonal to the first rotation axis and the angle through which the spins rotate is independent of the RF field strength. When the nuclear spins are placed in a non-homogeneous RF field and the above pulse sequence is applied, those spins which are located in an area where the RF field strength causes the first pulse set to rotate the spins through an angle which is a multiple of 2 .pi., the second, uniform rotation accumulates with each repetition of the first and second pulse sets in order to selectively excite those spins.
REFERENCES:
patent: 4999580 (1991-03-01), Meyer et al.
patent: 5117186 (1992-05-01), Burum et al.
"Time-Suspension Multiple-Pulse Sequences: Applications to Solid-State Imaging", D. G. Cory, J. B. Miller and A. N. Garroway Journal of Magnetic Resonance, vol. 90, pp. 205-213 (1990).
"Selective Excitation in Fourier Transform Nuclear Magnetic Resonance", G. A. Morris and R. Freeman, Journal of Magnetic Resonance, vol. 29, p. 433 (1978).
"A Simple Pulse Sequence for Selective Excitation in Fourier Transform NMR", G. Bodenhausen, R. Freeman and G. A. Morris, Journal of Magnetic Resonance, vol. 23, p. 171 (1976).
"Multiple-Pulse Methods of 1H N.M.R. Imaging of Solids: Second Averaging", Physics, vol. 70, No. 2, pp. 331-345 (1990).
Arana Louis
Bruker Instruments, Inc.
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