Inspection method and apparatus using nuclear magnetic resonance

Details Inspection method and apparatus using nuclear magnetic resonance Inspection method and apparatus using nuclear magnetic resonance

1997-01-08

1998-05-19

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324309, G01V 300

Patent

active

057540470

ABSTRACT:
An inspection method by means of an inspection apparatus using nuclear magnetic resonance and having magnetic field generating apparatus for generating a static magnetic field, gradient magnetic fields and an RF magnetic field; magnetic field generating apparatus by means of additional shim coils, which vary homogeneity of the static magnetic field by varying current flowing therethrough; signal detecting apparatus for detecting nuclear magnetic resonance signals from an object to be inspected; an apparatus for processing signals detected by the signal detecting apparatus; and control apparatus for controlling currents flowing through the shim coils, which method using nuclear magnetic resonance comprises a step of storing shim currents corresponding to each of a plurality of slices, capable of improving homogeneity of the static magnetic field for each of the plurality of slices, and a step of switching over the shim currents to those corresponding to a relevant slice to be measured prior to measurements of nuclear magnetic resonance signals from the slice. This inspection method can be applied also to a case where measurements of other slices are effected in intervals of measurements of the relevant slice.

REFERENCES:
patent: 4652826 (1987-03-01), Yamamoto et al.
patent: 4700136 (1987-10-01), Yamaguchi et al.
patent: 5121060 (1992-06-01), Doddrell et al.
patent: 5602480 (1997-02-01), Onodera et al.

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