Nuclear magnetic resonance diagnostic apparatus

Details Nuclear magnetic resonance diagnostic apparatus Nuclear magnetic resonance diagnostic apparatus

1984-03-09

1986-08-05

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324312, 324314, G01R 3320

Patent

active

046045805

ABSTRACT:
Apparatus is provided in an NMR diagnostic apparatus for reducing or eliminating low frequency cyclic noise. The NMR signals are phase demodulated using reference signals having the same frequency as the excitation signals. A provision is made to change the phases of the output reference signals by 180.degree.. These signals are selectively used to demodulate the received NMR signals which are first divided into two signals of the same phase. The demodulated signals, which are 180.degree. apart, are added thereby eliminating the cyclic noise component.

REFERENCES:
patent: 2968762 (1961-01-01), Schuster
patent: 3110858 (1963-11-01), Arnold
patent: 3124741 (1964-03-01), Primas
patent: 3711764 (1973-01-01), Ernst
patent: 3781650 (1973-12-01), Keller

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