FDTD modelling for microwave dosimetry and thermography

Taylor, Helen C; Hand, J.W.; Lau, R W M

doi:10.1049/ic:19950262

Cited by 5 publications

(5 citation statements)

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“…For example, in early testing and verification the code was used to calculate fields and SAR due to a 900 MHz dipole, 0.4 ϫ wavelength long, and placed 15 mm from spheres and cubes simulating the head. Results (E-field magnitude, SAR) using these standardized models were compared with other FDTD codes and other computational methods as part of the European Cooperation in the field of Scientific and Technical Research (COST) programme (31,32). Verification of the code for applications in clinical hyperthermia has also been made (33) and recently we have further verified the use of this code by comparing numerically predicted E-fields due to a rectangular coil in a phantom experiment with those measured using a calibrated minimally perturbing E-field probe in an identical experiment (24,34).…”

Section: Electromagnetic Modelingmentioning

confidence: 99%

Electromagnetic and thermal modeling of SAR and temperature fields in tissue due to an RF decoupling coil

Hand¹,

Lau²,

Lagendijk³

et al. 1999

Magn. Reson. Med.

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Section: Electromagnetic Modelingmentioning

confidence: 99%

Electromagnetic and thermal modeling of SAR and temperature fields in tissue due to an RF decoupling coil

Hand¹,

Lau²,

Lagendijk³

et al. 1999

Magn. Reson. Med.

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“…In this study, we have used the finite-difference time-domain (FDTD) method implemented in the commercial solver Sim4Life (ZMT, Zurich, Switzerland). FDTD is a technique that is commonly used to determine electromagnetic fields in and around dielectric objects [18], [19]. The PPCs are modeled as two perfect electric conductors of zero thickness and surface of 2×2 cm 2 , see Figure . 3.…”

Section: A Numerical Simulationmentioning

confidence: 99%

Surface-Mounted Parallel-Plate Coupler for Cylindric Dielectric Waveguides

Thielens

Benarrouch

Cathelin

et al. 2022

IEEE Trans. Microwave Theory Techn.

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Surface-mounted parallel-plate capacitors (PPCs) can be used as transducing elements in wireless communication, for example in human body-dedicated applications, such as healthcare monitoring or activity tracking, which require robust wireless communications and user-convenient implementation. In this context, PPCs are an attractive element due to their mobility, noninvasive positioning, and small form factors. Moreover, they are relatively easy to analyze with a simple design. This work studies the use of PPCs on dielectric, cylindrical waveguides as a precursor to the relatively complex electromagnetic environment that the human body is. The electromagnetic fields surrounding PPCs placed on a dielectric medium are described theoretically. This theory involves a combination of surface waves, inductive coupling, and quasi-static coupling between PPCs. In dielectric (cylindric) waveguides, the material's dimensions, and frequency of excitation dictate whether propagation of certain modes can occur. This manuscript shows, on the one hand, that these modes can be excited by a surface-mounted waveguide coupler such as PPCs, and on the other hand, that the associated propagation is governed by modal characteristics.

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“…By reciprocity, the weighting function can be determined from the normalized SAR distribution when the antenna is operating as a source rather than a receiver. FDTD simulations have been used to gain an understanding of the relationship between the power received at the radiometer's antenna and the microwave (thermal) radiation sources within the body under investigation (Taylor et al 1995). The advantages of using a numerical approach to study radiometry include the ability to model accurately the characteristics of the radiometer, particularly in the nearfield region, and to incorporate complex biological bodies into the model.…”

Section: Microwave Radiometrymentioning

confidence: 99%

Modelling the interaction of electromagnetic fields (10 MHz–10 GHz) with the human body: methods and applications

Hand¹

2008

Phys. Med. Biol.

139

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Numerical modelling of the interaction between electromagnetic fields (EMFs) and the dielectrically inhomogeneous human body provides a unique way of assessing the resulting spatial distributions of internal electric fields, currents and rate of energy deposition. Knowledge of these parameters is of importance in understanding such interactions and is a prerequisite when assessing EMF exposure or when assessing or optimizing therapeutic or diagnostic medical applications that employ EMFs. In this review, computational methods that provide this information through full time-dependent solutions of Maxwell's equations are summarized briefly. This is followed by an overview of safety- and medical-related applications where modelling has contributed significantly to development and understanding of the techniques involved. In particular, applications in the areas of mobile communications, magnetic resonance imaging, hyperthermal therapy and microwave radiometry are highlighted. Finally, examples of modelling the potentially new medical applications of recent technologies such as ultra-wideband microwaves are discussed.

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FDTD modelling for microwave dosimetry and thermography

Cited by 5 publications

References 0 publications

Electromagnetic and thermal modeling of SAR and temperature fields in tissue due to an RF decoupling coil

Electromagnetic and thermal modeling of SAR and temperature fields in tissue due to an RF decoupling coil

Surface-Mounted Parallel-Plate Coupler for Cylindric Dielectric Waveguides

Modelling the interaction of electromagnetic fields (10 MHz–10 GHz) with the human body: methods and applications

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