Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1987-09-17
1988-05-10
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01R 3320
Patent
active
047438509
ABSTRACT:
A method for determining the spatial distribution of an NMR responsive element in a selected volume of an object to be examined and the relaxation time in the rotating frame (Tl .rho.) of nuclei of the element. An external magnetic field is applied to the selected volume of the object. The nuclei in the selected volume are excited by a first electromagnetic pulse for generating a nuclear magnetization transverse to the direction of the main magnetic field. A second electromagnetic pulse is applied to the selected volume. The second pulse is oscillatory and has a phase selected such that the magnetic component of the pulse is directed parallel to the direction of the processing transverse nuclear magnetization. The relaxation obtained during this second pulse occurs in a rotating reference frame and is characterized by the relaxation time Tl .rho.. Magnetic field gradient pulses sequenced with said electromagnetic pulses are applied and the NMR signals collected to construct a map containing relaxation tiem in the rotating frame (Tl .rho.) data.
REFERENCES:
patent: 4480228 (1984-10-01), Bottomley
Instrumentarium Corp.
Tokar Michael J.
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