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Limits on focused power deposition for electromagnetic hyperthermia.

Computations of SAR distributions in homogeneous regions and in multilayered concentric cylindrical models of the torso are presented to illustrate how an increase in the localization of the fields and/or a decrease in attenuation of the fields in one dimension is accompanied by a decrease in the localization and/or an increase in the attenuation in the other dimensions. Sharp gradients that may exist in the EM intensity patterns at the surface of a body become less pronounced further into the body because the wave components having higher spatial frequencies are most rapidly attenuated.