Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1987-07-02
1988-03-01
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324309, G01R 3320
Patent
active
047288930
ABSTRACT:
A complete data set of complex-valued NMR signal responses (sufficient to determine an NMR image) is conventionally acquired. Thereafter, using such time domain signals and/or a one-dimensional Fourier transform of same, synthesized NMR signals are derived using assumed complex conjugate symmetry relationships between the desired NMR signal components. Such synthesized data is then averaged (e.g. with the actually acquired data) to result in averaged data having an improved signal-to-noise ratio (e.g. up to 100% improvement or more is theoretically possible). Such improvement is made possible because the noise signal components (unlike the desired signal components) do not actually exhibit complex conjugate symmetry. Accordingly, noise signals add incoherently while desired signals add coherently when the synthesized data is averaged. Once an averaged data set is thus derived having improved signal-to-noise ratio, it may be conventionally transformed to an NMR image (e.g. by two-dimensional Fourier transformation) so as to result in an NMR image having a similarly improved signal-to-noise ratio.
REFERENCES:
patent: 4649345 (1987-03-01), Yoda et al.
patent: 4661775 (1987-04-01), Kormos et al.
Pages 38-41 from a Thesis entitled "Instrumentation for the Measurement of Viscosity and Flow of Biological Fluids", by Lawrence E. Crooks, dated 6-28-78.
The Regents of the University of California
Tokar Michael J.
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