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\section{Discussions}  \subsection{Practical application}  This study used an ultrasound device to image the sample and track shear waves, due to its high temporal resolution, availability and ease of use. However, for a clinical implementation such as brain elasticity imaging, MRI is more suited for tracking shear waves, as acoustic waves used in ultrasound imaging for shear wave tracking are attenuated by the skull. A Moreover,  clinical MRI scanner has, moreover, scanners use generally  a five to 1.5 T magnetic field, which is  ten times highermagnetic field  than the permanent magnet one  used in this study. In a practical MRI implementation, no magnet would be necessary, and MRI-compatible coils should be used. Magnetic Resonance Elastography is usually employing continuous shear waves; but induction of a continuous electrical current by the coil could affect MRI measurements, so "repetitive transient" excitations, which would lead to a continuous wave, could be used.