Method of analysing the structure and characteristics of an obje

Details Method of analysing the structure and characteristics of an obje Method of analysing the structure and characteristics of an obje

1983-12-14

1987-03-31

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3320

Patent

active

046545948

ABSTRACT:
The invention relates to a method of recovering nuclear spin or NMR information about a target, such as a human body placed in at least substantially homogenous magnetic field, a desired part of the target being excited by means of a radiofrequency magnetic field which preferably deviates nuclear magnetization through 90.degree., a so-called spin echo is generated by utilizing a second excitation of the target volume which preferably deviates nuclear magnetization through 180.degree., said spin echo is recorded and said excitation sequence is repeated. At least one magnetic field is applied to the target in a manner that the duration and/or amplitude of said magnetic field gradient are varied between various repetitions, so that the difference between the absolute values of time integral of a value following said 180.degree. pulse and a value preceding said 180.degree. pulse of said magnetic field gradient obtains a different value. This way, the use of bipolar current sources is avoided. The invention is well adaptable to recovering information quickly especially about a plurality of image planes from a three-dimensional target.

REFERENCES:
patent: 4431968 (1984-02-01), Edelstein

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