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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 4: Optimal transmit efficiency as a function of the size of the two-dimensional excitation region of interest, for different spherical sample size and magnetic field strength.

Figure 4:

OPTXE is plotted in logarithmic scale for spherical samples with radii a = 7.5, 10, 15 cm and brain-mimicking electrical properties, adjusted for each magnetic field strength. The OPTXE is higher for smaller object sizes. The OPTXE in 2D ROI’s remains approximately constant until the ROI size approaches the diameter of the sphere section, at which point it starts to rapidly increase due to the contributions of the edge voxels where OPTXE is high (see Figure 2).