DTI with correction of motion-induced diffusion gradient inconsistency

摘要

A method and apparatus for magnetic resonance (MR) diffusion tensor imaging (DTI) with minimizes artifacts caused by motion-induced changes of the diffusion encoding. An object (10) is subject to at least one shot of a multi-echo imaging sequence to generate a train of echo signals. The multi-echo imaging sequence includes 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.