Pol Grasland-Mongrain edited The_normalized_magnitude_of_shear__.tex  over 8 years ago

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The normalized magnitude amplitude  of shear waves versus distance between the magnet and the PVA sample is illustrated in Figure \ref{Figure5}-(A); the normalized magnitude with versus  distance between the coil and the PVA sample along the Z axisis illustrated  in Figure \ref{Figure5}-(B); andthe normalized magnitude of shear waves  versus distance between the center of the coil and the center of the ultrasound probe along X axis (0 is consequently defined as the coil center aligned with the probe center)is illustrated  in Figure \ref{Figure5}-(C). Magnitude Amplitude  of shear waves was measured as the mean displacement between 15 and 25 mm of the coil, coil  inside the medium. This arbitrary location was used because it corresponded to positions where shear waves had high magnitudes. Magnitudes amplitudes. Amplitudes  were normalized by the maximum measured, respectively at a distance of 4 mm between the magnet and the sample, 10 mm between the coil and the medium and 0 mm between the center of coil and the center of probe. We observed a decrease of the shear wave magnitude amplitude  when the distance between the medium and the magnet increased, with an excellent agreement between experimental and numerical results. This was expected as the magnetic field decreased with distance. Similar observations can be made when the coil is drawn further from the sample. When we moved the coil along the X direction, we observed a strong maximum between two minima separated by 75 mm, corresponding to the length between the two centers of the TMS coil, which is also in agreement with the current density profile along this direction.