Specific Absorption Rate (SAR) estimation using near-field modal reconstruction from surface measurements in a curved phantom

A novel technique to evaluate the Specific Absorption Rate (SAR) induced by a cellular phone using only a limited number of measurements on a surface for a curved phantom is proposed. A modal expansion of the Electric field induced in a head model by a cellular phone is used. This technique is first based on the use of equivalent currents on a closed surface according to Huygens principle. Then, using Singular Value Decomposition, the induced E-field is expanded with the orthogonalized modes excited by the equivalent sources in a curved phantom filled by a liquid having the same properties than human tissues. Finally, the SAR is directly evaluated.