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Permittivity dependence. The effect of seven PZT blocks (dotted black lines) on the transmit field is shown for a wide range of permittivity values. Simulated fields were normalized with respect to 1 W of tissue dissipated power. Conductivity values were kept constant and equal to 0.38 S/m. The transmit field has an optimal efficiency between ε r = 900 and ε r = 1,300.
