Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1993-02-22
1994-08-23
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
G01R 3320
Patent
active
053410980
ABSTRACT:
In the case of a method for the generation of nuclear magnetic resonance (NMR) signals from a measuring volume with test substance which is exposed to a highly homogeneous stationary magnetic field B.sub.0, by irradiation of a sequence of at least two radio frequency (RF)-pulses into the measuring volume, wherein the at least two RF-pulses excite nuclear spins of the test substance within the measuring volume in a resonant manner within a frequency band which is narrow with respect to their frequency, the phases of the at least two RF-pulses are selected in dependence upon their frequency in such a manner that the phases of the NMR signals generated by each individual of the at least two RF-pulses are randomised in such a manner that the vectorial sum over the signal intensities of the individual signals is zero, whereas the combination of the at least two RF-pulses leads to the development of observable coherent magnetization of the test substance. Due to the usage of these so-called "white" RF-pulses, undesired NMR signals in the case of multi-pulse excitations can be suppressed in a simple manner without application of additional gradients.
REFERENCES:
patent: 4543959 (1985-10-01), Sepponen
patent: 4577152 (1986-03-01), Macovski
patent: 5196795 (1993-03-01), Bodenhausen et al.
Spectrospin AG
Tokar Michael J.
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