Journal ArticleDOI
Absorption Characteristics of Multilayered Sphere Models Exposed to UHF/Microwave Radiation
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TLDR
The interaction of electromagnetic plane waves with multilayered spherical models composed of lossy dielectric media that represent different biological tissues found in human and animal heads is examined in the frequency range 0.1 to 10 GHz.Abstract:
The interaction of electromagnetic plane waves with multilayered spherical models composed of lossy dielectric media that represent different biological tissues found in human and animal heads is examined in the frequency range 0.1 to 10 GHz. The model ranges in size from 2 to 12.5 cms outer radius and consists of a core of brain-like material surrounded by five outer layers of CSF, bone, fat and skin-dura tissues. The absorption properties of the model have been analyzed throughout this range of size and frequency. The distribution of internally deposited energy has also been investigated in detail for three basic spheres of 3.3, 6 and 10 cms radii, with emphasis on the creation of localized regions of strong heating (hot-spots). Based on these results, some generalized conclusions are presented on the interaction of microwaves with different sized biological objects.read more
Citations
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Book
Numerical Techniques in Electromagnetics, Second Edition
TL;DR: Numerical Techniques in Electromagnetics is designed to show the reader how to pose, numerically analyze, and solve electromagnetic (EM) problems using a variety of available numerical methods.
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RF-field interactions with biological systems: Electrical properties and biophysical mechanisms
H P Schwan,Kenneth R. Foster +1 more
TL;DR: In this article, the physical mechanisms for the observed temperature coefficients of the dielectric properties were discussed in terms of the interaction mechanisms which give rise to observed relaxational effects, and possible mechanisms for nonthermal weak interactions between radiofrequency energy and tissues were discussed and evaluated.
Journal ArticleDOI
Microwave heating: an evaluation of power formulations
TL;DR: In this paper, a general formulation for power absorbed in a homogeneous, isotropic multilayered medium exposed to plane waves from both faces has been developed, and temperature profiles obtained by solving the transient heat conduction equation with the microwave power as a source term.
Journal ArticleDOI
The dependence of electromagnetic energy absorption upon human head tissue composition in the frequency range of 300-3000 MHz
TL;DR: In this paper, the authors derived head tissue equivalent dielectric parameters that enable the utilization of one generic homogeneous head for testing compliance for the entire user group, i.e., granting no underestimation, but also not greatly overestimating the actual maximum user exposure.
Journal ArticleDOI
MIDA: A Multimodal Imaging-Based Detailed Anatomical Model of the Human Head and Neck
Maria Ida Iacono,Esra Neufeld,Esther Akinnagbe,Kelsey Bower,Johanna Wolf,Ioannis Vogiatzis Oikonomidis,Deepika Sharma,Bryn A. Lloyd,Bertram J. Wilm,Michael Wyss,Klaas P. Pruessmann,Andras Jakab,Nikos Makris,Ethan D. Cohen,Niels Kuster,Wolfgang Kainz,Leonardo M. Angelone +16 more
TL;DR: A multimodal imaging-based detailed anatomical model of the human head and neck, named “MIDA”, which offers also a detailed characterization of eyes, ears, and deep brain structures.
References
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Journal ArticleDOI
Nonionizing electromagnetic wave effects in biological materials and systems
C.C. Johnson,A.W. Guy +1 more
TL;DR: In this paper, the problem of microwave penetration into the body with resultant internal power absorption is approached from both the theoretical and the experimental viewpoints, in terms of therapeutic warming of tissues and possible hazards caused by internal "hot spots."
Journal ArticleDOI
Induced Fields and Heating Within a Cranial Structure Irradiated by an Electromagnetic Plane Wave
TL;DR: In this article, the induced fields and the static heating patterns within a multilayered spherical model that approximates the primate cranial structure irradiated by plane waves in the microwave spectrum are calculated.
Journal ArticleDOI
Hot Spots Generated in Conducting Spheres by Electromagnetic Waves and Biological Implications
H. N. Kritikos,Herman P. Schwan +1 more
TL;DR: The distribution of the heating potential generated by an incident electromagnetic plane wave on a conducting sphere simulating the human head was investigated and it was found that for a sphere of 10-cm radius having the same electrical characteristics as those of biological tissues, no hot spots are generated inside.
Journal ArticleDOI
Power Deposition in a Spherical Model of Man Exposed to I-20-MHz Electromagnetic Fields
TL;DR: In this article, the induced electric fields inside the model exposed to either plane wave or near fields can be described by a combination of quasi-static electric and magnetic induction solutions, and it is shown that for field impedances less than 1200/spl pi/spl Omega/ the magnetically induced energy absorption predominates.
Journal ArticleDOI
Hazards Due to Total Body Irradiation by Radar
H. P. Schwan,K. Li +1 more
TL;DR: In this paper, the authors analyzed the mode of propagation of electromagnetic radiation into the human body and resultant heat development and showed that the percentage of absorbed energy is near 40 per cent at frequencies much smaller than 1000 and higher than 3000 cm.
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