Proceedings ArticleDOI
Accurate FDTD simulation of biological tissues for bioelectromagnetic applications
Mohamed Eleiwa,Atef Z. Elsherbeni +1 more
- pp 174-178
TLDR
In this article, a numerical technique is proposed to derive the Debye coefficients from the measured frequency-dependent permittivity of different biological tissues, and then a scattered field FDTD formulation is developed for such dispersive media characterized by multi-term Debye expressions.Abstract:
For practical bio-electromagnetic applications, such as the interaction of electromagnetic fields with the human head and body, accurate simulation of biological tissues is a key factor for reliable results. The characteristics of biological tissues are frequency dependent and thus called dispersive materials. For accurate FDTD simulation of biological tissues, a numerical technique is proposed to derive the Debye coefficients from the measured frequency-dependent permittivity of different biological tissues, and then a scattered field FDTD formulation is developed for such dispersive media characterized by multi-term Debye expressions. The proposed scattered field FDTD formulation is valid for three dimensional analysis of practical EM problems involving combination of dispersive and non-dispersive materials. The developed procedure has been verified for different types of biological tissues over a very wide band of frequency (from 30 Hz to 20 GHz). The reflection coefficients of a semi-infinite dispersive medium using one, two, and three-term Debye expressions are computed and compared favorably with the corresponding analytical solution. Hence, the accuracy and stability of modeling multi-term Debye dispersive materials using the proposed scattered FDTD formulation is assessed.read more
Citations
More filters
Journal ArticleDOI
A confocal microwave imaging algorithm for breast cancer detection
Xu Li,Susan C. Hagness +1 more
TL;DR: A computationally efficient and robust image reconstruction algorithm for breast cancer detection using an ultrawideband confocal microwave imaging system and a two-dimensional anatomically realistic MRI-derived FDTD model of the cancerous breast is presented.
Journal ArticleDOI
Confocal Microwave Imaging for Breast Cancer Detection: Delay-Multiply-and-Sum Image Reconstruction Algorithm
TL;DR: The reconstructed images illustrate improvement in identification of embedded malignant tumors over the delay-and-sum algorithm and successful detection and localization of tumors as small as 2 mm in diameter are demonstrated.
Patent
Methods and apparatus for reducing sweat production
TL;DR: In this paper, a method of treating a patient is provided which involves identifying a patient having a condition of excessive sweating, positioning an energy delivery device proximate to a skin tissue of the patient and delivering energy to sweat glands to halt secretion of sweat.
Patent
Systems, apparatus, methods and procedures for the noninvasive treatment of tissue using microwave energy
Jessi E. Johnson,Mark Deem,Daniel Francis,Steven Kim,Alexey Salamini,Ted Su,Peter H. Smith,Daniel Hallock,Yoav Ben-Haim,Shailendhar Saraf +9 more
TL;DR: In this article, a medical device and associated apparatus and procedures are used to treat dermatological conditions using microwave energy, and the present invention is directed to systems, apparatus, methods and procedures for the noninvasive treatment of tissue using microwaved energy.
Patent
Applicator and tissue interface module for dermatological device
Yoav Ben-Haim,Peter J. Bentley,Donghoon Chun,Daniel Francis,Jessi E. Johnson,Shan Kevin,Ted Su,Steven Kim +7 more
TL;DR: An applicator chamber may include: an opening adapted to receive the applicator; an attachment mechanism positioned in the applicators chamber and adapted to attach the tissue interface module to the application.
References
More filters
Journal ArticleDOI
The dielectric properties of biological tissues: III. Parametric models for the dielectric spectrum of tissues
TL;DR: A parametric model was developed to enable the prediction of dielectric data that are in line with those contained in the vast body of literature on the subject.
Journal ArticleDOI
A frequency-dependent finite-difference time-domain formulation for dispersive materials
TL;DR: In this paper, the traditional finite difference time domain (FDTD) formulation is extended to include a discrete time-domain convolution, which is efficiently evaluated using recursion, and the accuracy of the extension is demonstrated by computing the reflection coefficient at an air-water interface over a wide frequency band including the effects of the frequency-dependent permittivity of water.
Journal ArticleDOI
EM interaction of handset antennas and a human in personal communications
TL;DR: In this article, the authors investigated the effect of the tissue location and physical model on the antenna performance and found that the head and hand absorb between 48 and 68% of the power delivered to the antenna.
Journal ArticleDOI
A frequency-dependent finite-difference time-domain formulation for general dispersive media
TL;DR: In this article, a new differential equation approach is proposed for general dispersive media for which the complex permittivity in *( omega ) may be described by a single-order Debye relaxation equation or a modified version thereof.
Journal ArticleDOI
Propagation in linear dispersive media: finite difference time-domain methodologies
TL;DR: In this article, a finite difference time-domain (FDTD) method for electromagnetic wave propagation in two different kinds of linear dispersive media: an Nth order Lorentz and an Mth order Debye medium is presented.
Related Papers (5)
The dielectric properties of biological tissues: III. Parametric models for the dielectric spectrum of tissues
BI-FDTD: a novel finite-difference time-domain formulation for modeling wave propagation in bi-isotropic media
Alkim Akyurtlu,Douglas H. Werner +1 more