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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 9: Comparison of the optimal transmit efficiency in the heterogeneous head model and the head-mimicking uniform sphere, as a function of voxel position and for different magnetic field strengths.

Figure 9:

OPTXE is plotted in logarithmic scale for the central sagittal plane of the “Duke” head model and the spherical sample with radius a = 10 cm, for B0 = 1.5T, 7T, 10.5T, 21T. OPTXE profiles along the x, y, and z axes are in agreement between the two objects, especially for the case of the y-profile, for which the dimension of the head matches the radius of the sphere. OPTXE decreased with increasing field strength for both the heterogeneous head model and the uniform sphere.