Method of reducing artefacts in images formed by means of fourie

Details Method of reducing artefacts in images formed by means of fourie Method of reducing artefacts in images formed by means of fourie

1985-03-04

1987-07-21

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324312, G01R 3320

Patent

active

046821104

ABSTRACT:
NMR images formed by means of Fourier zeugmatography contain disturbing artefacts which are caused by coherent interference signals (for example, offset signals, non-ideal 180.degree. reversing pulses). In accordance with the invention, alternating phase (90.degree.) excitation pulses are used in the successive measurement cycles and the signal samples taken during the measurement cycles are stored in adjacent rows of an image frequency matrix. The values in every second row of the matrix are inverted, so that the contributions of the coherent interference signals change their sign in every row in the direction of the columns. During the Fourier transformation of the columns, therefore the artefacts caused by the interference signals are shifted towards the edge of the image.

REFERENCES:
patent: 4115730 (1978-09-01), Mansfield
patent: 4443760 (1984-04-01), Edelstein et al.
patent: 4506223 (1985-03-01), Bottomley et al.
patent: 4573014 (1986-02-01), Riederer

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