Method of reducing artefacts in images formed by means of Fourier Zeugmatography.

摘要

NMR images formed by means of Fourier zeugmatography contain disturbing artefacts which are caused by coherent inter- ference signals (for example, offset signals, non-ideal 180° eversing 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 mage frequency matrix. The values in every second row of the natrix are inverted, so that the contributions of the coherent nterference signals change their sign in every row in the direction of the columns. During the Fourier transformation of the columns, :herefore the artefacts caused by the interference signals are shifted towards the edge of the image.