DTI WITH CORRECTION OF MOTION-INDUCED DIFFUSION GRADIENT INCONSISTENCY

摘要

The invention relates to a method of MR imaging of an object (10) placed in an examination volume of a MR device (1). It is an object of the invention to enable diffusion tensor imaging (DTI) with minimization of artifacts caused by motion-induced changes of the diffusion encoding. The method of the invention comprises the steps of:—subjecting the object (10) to at least one shot of a multi-echo imaging sequence, a train of echo signals being generated by the shot, wherein the multi-echo imaging sequence comprises diffusion gradients;—acquiring the echo signals for different diffusion gradients;—detecting motion of the object (10) during acquisition of the echo signals;—determining a plurality of motional states of the object (10) based on the detected motion, wherein the object (10) is stationary in each detected motional state;—determining directions of the diffusion gradients relative to a reference frame of the object (10) for detected motional states of the object (10), respectively; and—deriving diffusion coefficients from the acquired echo signals for the determined relative directions of the diffusion gradients. Moreover, the invention relates to a MR device for carrying out this method as well as to a computer program to be run on a MR device.