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. Author manuscript; available in PMC: 2021 Nov 1.
Published in final edited form as: NMR Biomed. 2020 Jul 28;33(11):e4383. doi: 10.1002/nbm.4383

Figure 2: Optimal transmit efficiency as a function of voxel position, for different spherical sample size and magnetic field strength.

Figure 2:

OPTXE is plotted in logarithmic scale across the diameter of spherical samples with radii a = 7.5, 10, 15 and brain-mimicking electrical properties at the corresponding magnetic field strengths B0 = 0.5, 1.5, 3, 7, 10.5, 14, 21T. OPTXE decreases for larger objects and as the magnetic field strength increases up to 7T. At voxels closer to the center, OPTXE increases again for magnetic field strengths > 7T, except for the largest sphere. Near the edge of the spherical sample, OPTXE is order of magnitudes higher than at the center, for all object sizes and field strengths.