Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1982-01-20
1984-08-28
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01R 3308
Patent
active
044686218
ABSTRACT:
Spatially discriminated information is obtained by appropriate processing of data derived from a series of pulsed N.M.R. operations performed with a magnetic field exhibiting a linear gradient whose magnitude is different for each operation. In obtaining a two-dimensional image of spin density distribution, coil sets (5 and 6) are used to generate magnetic field components giving x and y gradients, the former being changed stepwise in magnitude and the latter being fixed. For each value of x gradient, the sample (1) is irradiated with pulsed r.f. energy, resultant N.M.R. signals being detected by phase-sensitive detectors (19 and 20) whose outputs are regularly sampled by A-D converters (25 and 26). Processing of the complete sampled data by a computer (12) involves both Fourier transformation with respect to x gradient magnitude and Fourier transformation with respect to time. For sectional images a third coil set (7) is used to generate a component giving an alternating z gradient and the irradiation consists of a train of pulses.
REFERENCES:
patent: 4015196 (1977-03-01), Moore et al.
patent: 4184110 (1980-01-01), Hinshaw
patent: 4319190 (1982-03-01), Brown
P. C. Lauterbur, "Image Formation by Induced Local Interactions: Examples Employing Nuclear Magnetic Resonance," from Nature, vol. 242, Mar. 16, 1973, pp. 190 and 191.
National Research Development Corporation
Tokar Michael J.
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