Nuclear magnetic resonance methods and apparatus

Details Nuclear magnetic resonance methods and apparatus Nuclear magnetic resonance methods and apparatus

1983-06-02

1986-01-07

Karlsen, Ernest F.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01R 3308

Patent

active

045636478

ABSTRACT:
A method of exciting nuclear magnetic resonance at a particular location of a body comprises: exciting first nuclear spins in the body (A, Gx, -G'x, B, Gxd, C, Gy, -G'y, D) so that spins occurring in a first selected region of the body have their spin vectors lying in a first direction and any spins occurring elsewhere in the body have their spin vectors lying in a plane normal to the first direction; dephasing the spins in the body whose vectors lie in said plane (Gyd); and exciting nuclear spins in a second selected region of the body (E, Gz, -G'z) which intersects said first region at said particular location so that the vectors of the resultant spins in said particular location only are aligned in said plane.
The method finds particular application in providing data for chemical analysis of material at a particular location of a body.
Apparatus for carrying out the method is also described.

REFERENCES:
patent: 4318043 (1982-03-01), Crooks et al.
patent: 4322684 (1982-03-01), Hounsfield
patent: 4355282 (1982-10-01), Young et al.

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