A process for the reduction of eddy current effects in the case of a diffusion - weighted echo planar imaging - -

摘要

Eddy current - correction method in a magnetic resonance system (10) for generating an echo planar imaging - - - (epi -) pulse sequence for the detection of magnetic resonance images, wherein the pulse sequence contains a certain gradient and a number of epi - location coding gradient requires, comprising the steps ofDeriving of eddy current parameters, which are each provided with vortex current magnet fields are associated, which are caused by the specific gradient,Generating a group of correction terms with a first and a second correction term - subgroup, wherein each of the correction terms is a function of these parameters,selectively modifying a group consisting of an ideal epi - gradient in accordance with the correction terms, wherein each of the ideal epi - gradient a first component, the prior to the detection of data occurs, and a second component, which during the detection of the data occurs, and the first (44) and second (46) for a given ideal gradient component in each case by means of correction terms of the first and second subgroup is modified, andApplying the modified epi - gradient (74, 76, 78) than the required epi - gradient for the pulse sequence, in order to be made of the eddy current fields..