Electromagnetic Analysis of a Non-Invasive 3d Passive Microwave Imaging System

Karanasiou, Irene S.; Uzunoglu, N.K.; Garetsos, A.

doi:10.2528/pier03080801

Cited by 30 publications

(53 citation statements)

References 13 publications

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“…Water phantom and animal experiments demonstrate that the voltage output from the system is linearly correlated with the actual temperature of the subjects of interest, a fact that is expected when the conductivity of the media under measurement remains unchanged [2][3][4][5]7]. Experimental data from cylindrical shaped saline or de-ionized water filled tank phantoms, in which saline solutions of different concentrations were infused, provide promising results concerning the systems capability of detecting conductivity variations in phantoms at 3.5 GHz [6].…”

Section: System Overviewmentioning

confidence: 99%

“…According to previous experimental results the system shows the ability of measuring temperature and conductivity variations in phantoms and biological tissues [2][3][4][5][6][7]. Water phantom and animal experiments demonstrate that the voltage output from the system is linearly correlated with the actual temperature of the subjects of interest, a fact that is expected when the conductivity of the media under measurement remains unchanged [2][3][4][5]7].…”

Section: System Overviewmentioning

confidence: 99%

“…The system design has been based on rigorous theoretical analysis that has been performed using commercial tools using FEM and FDTD and a semi-analytical method based on Greens function theory [1][2][3][4]. The field distribution inside the whole ellipsoidal volume as well as inside human head volumes has been calculated in detail and presented.…”

Section: System Overviewmentioning

confidence: 99%

“…Extensive phantom experiments as well as human tests have been realized in a non invasive, totally passive contactless manner and have shown promising results concerning the system's ability of detecting temperature and conductivity variation distributions [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Electromagnetic Analysis of a Non Invasive Microwave Radiometry Imaging System Emphasizing on the Focusing Sensitivity Optimization

Giamalaki¹,

Karanasiou²,

Uzunoglu

2009

PIER

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Abstract-A Green's function based methodology has been developed and implemented with the view to optimize the focusing properties and thus the performance of a Microwave Radiometry Imaging System (MiRaIS). The system consists of an ellipsoidal conductive wall cavity and a sensitive radiometric receiver and its operation principal is based on the convergence of the radiation from one focal point, where the subject or phantom is placed, on the other, where the receiver antenna is positioned. A two-layered cylinder is used to model the human head with the semi-analytical Green's function technique. The imaging configuration is enhanced by different matching structures of various materials which are placed on the surface of both the human head model and the antenna inside the ellipsoidal. Numerical code executions have been realized and the results for the electric field distribution inside the head are presented for materials of various dielectric properties and for left handed materials at two different frequencies (0.5 GHz and 1.0 GHz). Increased sensitivity of the system focusing properties is observed using particular matching structures.

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Section: System Overviewmentioning

confidence: 99%

Section: System Overviewmentioning

confidence: 99%

Section: System Overviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electromagnetic Analysis of a Non Invasive Microwave Radiometry Imaging System Emphasizing on the Focusing Sensitivity Optimization

Giamalaki¹,

Karanasiou²,

Uzunoglu

2009

PIER

Self Cite

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“…Development of non-invasive imaging has gained traction over the years due to its important role in basic research and clinical diagnosis [1][2][3]. Optical imaging methods using near infrared light are considered harmless.…”

Section: Introductionmentioning

confidence: 99%

Vectorial Electric Field Monte Caro Simulations for Focused Laser Beams (800 Nm-2220 Nm) in a Biological Sample

Cai¹,

Yu²,

He³

2013

PIER

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Abstract-Here we develop a method that combines vectorial electric field Monte Carlo simulation with Huygens-Fresnel principle theory to determine the intensity distribution of a focused laser beam in a biological sample. The proper wavelengths for deep tissue imaging can be determined by utilizing our method. Furthermore, effects of anisotropic factor, scattering and absorption coefficients on the focal spots are analyzed. Finally, the focal beams formed by objective lenses with different values of numerical aperture are also simulated to study the focal intensity in the biological sample.

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Contactless passive diagnosis for brain intracranial applications: A study using dielectric matching materials

Gouzouasis¹,

Karathanasis²,

Karanasiou³

et al. 2010

Bioelectromagnetics

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A prototype system for passive intracranial monitoring using microwave radiometry is proposed. It comprises an ellipsoidal conductive wall cavity to achieve beamforming and focusing, in conjunction with sensitive multiband receivers for detection. The system has already shown the capability to provide temperature and/or conductivity variations in phantoms and biological tissue. In this article, a variant of the initially constructed modality is theoretically and experimentally investigated. Specifically, dielectric matching materials are used in an effort to improve the system's focusing attributes. The theoretical study investigates the effect of dielectric matching materials on the system's detection depth, whereas measurements with phantoms focus on the investigation of the system's detection level and spatial resolution. The combined results suggest that the dielectric matching layers lead to the improvement of the system's detection depth and temperature detection level. Also, the system's spatial resolution is explored at various experimental setups. Theoretical and experimental results conclude that with the appropriate combination of operation frequencies and dielectric layers, it is possible to monitor areas of interest inside human head models with a variety of detection depths and spatial resolutions.

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Electromagnetic Analysis of a Non-Invasive 3d Passive Microwave Imaging System

Cited by 30 publications

References 13 publications

Electromagnetic Analysis of a Non Invasive Microwave Radiometry Imaging System Emphasizing on the Focusing Sensitivity Optimization

Electromagnetic Analysis of a Non Invasive Microwave Radiometry Imaging System Emphasizing on the Focusing Sensitivity Optimization

Vectorial Electric Field Monte Caro Simulations for Focused Laser Beams (800 Nm-2220 Nm) in a Biological Sample

Contactless passive diagnosis for brain intracranial applications: A study using dielectric matching materials

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