Figure 4
From: Improving magnetic resonance imaging with smart and thin metasurfaces
MRI results for structural images with EP1 using a kiwi fruit and \({TR = 100\,}\)ms. The SNR is shown for slice# 5 and Rx by (a) the SLC, (b) the body coil, and (c) body coil + smart metasurface (EP1). Note that the slices are parallel to the metasurface. The SNR in the ROI is indicated, respectively. (d) SNR in the ROI as a function of the flip angle in slice# 5. The Ernst angle is not shifted in presence of the metasurface. Hence, the SNR increase is only due to influence on the Rx field. (e) The SNR as a function of distance from the SLC / EP for the measurement with \({TR = 1\,}\)s and flip angle of \(75\,\)deg (approx. Ernst angle). At a certain distance, the metasurface outperforms the SLC. Compared to the body coil, the metasurface leads to an eightfold increase in the SNR close to the surface.
