Method and arrangement for suppressing coherent interferences in

Details Method and arrangement for suppressing coherent interferences in Method and arrangement for suppressing coherent interferences in

1987-05-27

1989-10-10

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01R 3320

Patent

active

048734870

ABSTRACT:
In NMR images, which are constructed from resonance signals, for example with Fourier zeugmatography, due to coherent interferences, for example, as a result of "leak-through" of NMR signals from one sequence to a next sequence of resonance signals, artefacts can occur in the images, which, depending upon the kind of interference, become manifest in the image as interference lines, ghost images or conspicuous dots. A method is disclosed of reducing the influence of these interferences by smearing the artefacts out over the image as noise. For this purpose, the phase of the reference signals is randomly modulated between measuring cycles of the resonance signals. The reference signal is used to form excitation pulses for producing resonance signals in a body and further in synchronous detection of the resonance signals.

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Freeman, R., et al. "Phase and Intensity Anomalies in Fourier Transform NMR", J. of Magnetic Res., vol. 4, 1971.

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