Method and apparatus for examination by nuclear magnetic resonan

Details Method and apparatus for examination by nuclear magnetic resonan Method and apparatus for examination by nuclear magnetic resonan

1983-09-01

1985-08-20

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3308

Patent

active

045367124

ABSTRACT:
An examination method and apparatus utilizes a nuclear magnetic resonance technique in which the body of a subject to be examined is placed in a uniform static magnetic field and subjected to an electromagnetic wave having a frequency which induces nuclear magnetic resonance, a magnetic field is also applied to the subject body to specify an area of the body from which nuclear magnetic resonance (NMR) signals are radiated, and such nuclear magnetic resonance signals from the specified body area are received. A first 90.degree. pulse as the electromagnetic wave is applied to the body to excite the same, and then a 180.degree. pulse is applied to the body to produce an echo signal. A second 90.degree. pulse is to the body when the echo signal is maximum to thereby allow a magnetization to return to a state of thermal equilibrium. The foregoing sequence of the steps is repeated at prescribed intervals.

REFERENCES:
patent: 4115730 (1978-09-01), Mansfield
patent: 4297637 (1981-10-01), Crooks
patent: 4300096 (1981-11-01), Harrison
patent: 4315216 (1982-02-01), Clow
patent: 4318043 (1982-03-01), Crooks
patent: 4431968 (1984-02-01), Edelstein

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