Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1985-01-31
1987-06-09
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324320, 324309, G01R 3320
Patent
active
046723188
ABSTRACT:
A method of measuring a static magnetic field distribution in a nuclear magnetic resonance (NMR) inspection system which comprises magnetic field generator for producing a static magnetic field, inclination or gradient magnetic fields and a high-frequency magnetic field, a signal detector for sensing nuclear magnetic resonance signals from an inspection sample, a computer for processing output signals from the signal detector and an output device for providing a computational result of the computer, wherein a time interval t.sub.1 from the center of a 90.degree.-pulse high-frequency magnetic field to the center of a 180.degree.-pulse high-frequency magnetic field is made different by a time difference t.sub.0 from a time interval t.sub.2 from the center of the 180.degree.-pulse high-frequency magnetic field to a peak of a spin echo, so that static magnetic field distribution is calculated based on the computer output which corresponds to the difference of the two time intervals.
REFERENCES:
patent: 4510449 (1985-04-01), Ernst et al.
patent: 4583044 (1986-04-01), Case et al.
patent: 4585992 (1986-04-01), Maudsley et al.
A. A. Maudsley et al., Rapid . . . Magnetic Resonance, Siemens Forsch u. Entwickl. Ber. 8,Nr.6, pp. 326-331, 1979.
Kohno Hideki
Matsui Shigeru
Sekihara Kensuke
Yamamoto Etsuji
Hitachi , Ltd.
Levy Stewart J.
Oldhan Scott M.
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