An efficient use of mixing model for computing the effective dielectric and thermal properties of the human head

• Published in: Medical & biological engineering & computing 2018-11, Vol.56 (11), p.1987-2001
• Main Authors: Mishra, Varsha, Puthucheri, Smitha, Singh, Dharmendra
• Format: Article
• Language: English
• Subjects: Absorption; Biomedical and Life Sciences; Biomedical Engineering and Bioengineering; Biomedicine; Boundary layers; Cell Phone; Cell phones; Cellular telephones; Complex permittivity; Computation; Computer Applications; Computer Simulation; Dielectric properties; Electric Conductivity; Electrical properties; Electromagnetic Fields; Exposure; Federal regulation; Head; Head - physiology; Human body; Human Physiology; Humans; Imaging; Magnetic Resonance Imaging - methods; Original Article; Permittivity; Radiation; Radio Waves; Radiology; Thermal properties; Thermodynamic properties; Tissues
• ISSN: 0140-0118; 1741-0444
• DOI: 10.1007/s11517-018-1828-x

As a preventive measure against the electromagnetic (EM) wave exposure to human body, EM radiation regulatory authorities such as ICNIRP and FCC defined the value of specific absorption rate (SAR) for the human head during EM wave exposure from mobile phone. SAR quantifies the absorption of EM waves in the human body and it mainly depends on the dielectric properties ( ε ′, σ ) of the corresponding tissues. The head part of the human body is more susceptible to EM wave exposure due to the usage of mobile phones. The human head is a complex structure made up of multiple tissues with intermixing of many layers; thus, the accurate measurement of permittivity ( ε ′) and conductivity ( σ ) of the tissues of the human head is still a challenge. For computing the SAR, researchers are using multilayer model, which has some challenges for defining the boundary for layers. Therefore, in this paper, an attempt has been made to propose a method to compute effective complex permittivity of the human head in the range of 0.3 to 3.0 GHz by applying De-Loor mixing model. Similarly, for defining the thermal effect in the tissue, thermal properties of the human head have also been computed using the De-Loor mixing method. The effective dielectric and thermal properties of equivalent human head model are compared with the IEEE Std. 1528. Graphical abstract ᅟ