Quadrature detection circuit for nuclear magnetic resonance appa

Details Quadrature detection circuit for nuclear magnetic resonance appa Quadrature detection circuit for nuclear magnetic resonance appa

1987-03-30

1988-03-29

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324307, G01R 3320

Patent

active

047346485

ABSTRACT:
A quadrature detection circuit compensates for phase and amplitude differences in an NMR quadrature detection apparatus. The quadrature detection circuit comprises a test signal generator, first and second modulators, amplitude detectors, phase error detectors and a corrector. The corrector compensates the NMR signal as to phase and amplitude factors determined during an initial calibration mode utilizing the test signals, thus eliminating ghost images of the object which would otherwise be formed during image reconstruction.

REFERENCES:
patent: 3501691 (1970-03-01), Ernst
patent: 3999118 (1976-12-01), Hoalt
patent: 4446431 (1984-05-01), McKay
patent: 4602213 (1986-07-01), Sugiura
patent: 4604580 (1986-08-01), Sugiura et al.
patent: 4628262 (1986-12-01), Maudsley
patent: 4689567 (1987-08-01), Maudsley

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