G - Physics – 01 – N
Patent
G - Physics
01
N
324/1
G01N 24/08 (2006.01) G01R 33/54 (2006.01) G01R 33/565 (2006.01)
Patent
CA 1254943
ABSTRACT: "Method of reducing artefacts in images formed by means of Fourier zeugmatography." NMR images formed by means of Fourier zeugmato- graphy contain disturbing artefacts which are caused by coherent interference signals (for example, offset signals, non-ideal 180° reversing pulses). In accordance with the invention, alternating phase (90°) excitation pulses are used in the successive measurement cycles, the signal samples taken during the measurement cycles being stored in the adjacently situated rows of an image frequency matrix. The values in every second row of the matrix are inverted, so that the contributions of the coherent inter- ference signals change their sign in every row in the direction of the columns. During the Fourier transfor- mation of the columns, therefore the artefacts caused by the interference signals are shifted towards the edge of the image.
475724
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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