Figure 7.

(a) Hot spot size for experimental data and simulations. The hot spot size is measured and simulated at 1.5 cm away from the lowest point of the coil, (b) electric field intensity decay rate (in percentage) as a function of depth for the experimental measurements, (c) electric field intensity decay rate (in percentage) as a function of depth for FEM simulations. The presented distance in this figure is from the surface of the coil in the air. In contrast, in Deng et al [25], the distance is considered from the cortex, which is 2 cm away from the coil’s surface. Considering the same concept for this figure (from 2 cm to 2.5 cm) indicates about 10% improvement from the figure-8 coil to Coil B, which matches the data obtained in the first part of this study in figure 2 through 4.