Motion Correction in MR-Elastography

Marion Tardieu¹, Marie Poirier-Quinot¹, Emeline Lamain¹, Ralph Sinkus², Luc Darrasse¹, Xavier Matre¹

MR-elastography (MRE) aims at characterizing the properties of tissues by motion sensitized phase measurements, and had to cope with the intrinsic motions of the patient itself. A method taking account a correction for both spatial and displacement field component is proposed and is evaluated on a numerical brain phantom: a degradation of a in vivo 3D MRE acquisition (without motion) by 3D rotations between the three spatial encoded directions. The standard deviation of the difference between the reference acquisition phase and the motion simulated one decreased of about a factor 3 to 6 for motion angle of 0.5 to 5.