Circuit Models for 2-Dimensional Em Absorption by Biological Bodies

Abstract

Abstract-In this paper, new circuit models are used to calculate the induced fields in biological media exposed to an incident plane wave in the two-dimensional cases. These models represent the induced fields in the medium using the lossy long transmission line model [1]. The voltages and currents in the circuit model simulate the electric and magnetic fields in the medium. The response of the medium to the incident wave is represented by equivalent conduction and polarization current sources in the medium. These currents are used as the excitation sources in the circuit model from which the required induced fields are obtained. An accurate absorbing impedance boundary condition for open boundaries is used which considerably reduces the matrix dimensions. The validity of these models is tested in the problem of absorption of E-and H-waves by biological multilayered cylinders. Results are compared with available analytical and numerical solutions.

Investigation and reduction methods of specific absorption rate for biomedical applications: A survey

“…Abd‐Alhamed et al also investigated and compared two methodologies of MOM and MOM/FDTD, and his remarks regarding hybrid computation method applicable for complex geometries especially under Lossy dielectric models. Elkaramany and El Hadeed introduced a circuit model method for SAR computation in 2 dimensions. The downsides of these methods have several approximations considered as staircase approximation and approximations due to boundary conditions for matrix size reductions.…”

Design Analysis of Ferrite Sheet Attachment for Sar Reduction in Human Head

“…The head models used in this study was obtained from MRI-based head model through the whole brain Atlas website. Six types of tissues, i.e., bone, brain, muscle, eye ball, fat, and skin were involved in this model [22][23][24][25][26]. Table 2 shows their dielectric properties [23,24].…”

“…A helix antenna was modeled for this paper by thin-wire approximation. Simulations of ferrite sheet are performed by FDTD method with Lossy-Drude Model [23][24][25][26]. The method is utilized to understand the wave propagation characteristics of ferrite sheet.…”