FDTD estimation for accurate specific absorption rate in a tumor

Conventionally, Specific Absorption Rate (SAR) to a cancer tumor is estimated using an inaccurate water phantom method in hospitals. In this paper, we propose an accurate SAR estimation method using Finite Difference Time Domain (FDTD) technique. The FDTD method is employed in calculating the absorption of electromagnetic energy within complex, lossy dielectric human tissues. In this work, the tumor is formulated as cubical cells where each cubic cell is modeled as Yee´s cell. The difference equations are obtained based on the Yee´s cell model. The permittivity and conductivity of tumor are accurately considered in our work, instead of assuming that of water as in conventional method. An X-ray frequency sinusoidal feed is applied to the proposed model. Simulations are carried out using Matlab and the numerical results are shown that our method is more accurate than conventional water Phantom method. Internal Specific Absorption Rates are calculated within the tumor accurately. To comply with As Low As Reasonably Achievable (ALARA) principle, the SAR to a tumor is reduced to 15% to that of conventional method using our technique.