A method for the improvement of the signal - rausch - ratio in the case of a nuclear spin tomography device -

摘要

with the erfindungsgemu00e4u00dfen procedure signal noise ratio at the echoplanar imaging procedures (epi) are improved. the rapid switching of gradient epi necessary high amplitude is not usually rechteckfu00f6rmigen gradient effect.therefore, the auslesegradienten typically producing gradientenspule (gx) in a resonanzkreis used, so that the auslesegradient a sinus shape profile. it is, however, a kernresonanzsignals equidistant scanning of a scanning time domain in k - space with different speeds.the bandwidth of the signal is proportional to the amount of speed in k - space. the erfindungsgemu00e4u00dfe idea is the range of a bandpau00df or tiefpau00dffilters (22, 23) for the kernresonanzsignal to vary for the time-dependent spectrum of kernresonanzsignals, i.e. the speed of the k - space adjusted.as a result, the signal noise ratio improved significantly.