A passive 3D imaging thermograph using microwave radiometry

Karanasiou, Irene S.; Uzunoglu, N.K.; Stergiopoulos, Stergios; Wong, Wing C.

doi:10.1016/j.rbmret.2004.07.003

Cited by 17 publications

(11 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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: 91%

“…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: 92%

“…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

View full text Add to dashboard Cite

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.

show abstract

Section: System Overviewmentioning

confidence: 91%

Section: System Overviewmentioning

confidence: 92%

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

View full text Add to dashboard Cite

show abstract

“…Taking into account the above considerations and findings, efforts have been made by our group over the past few years to develop a biomedical tool for diagnostic intracranial applications based on microwave radiometry [Karanasiou et al, 2004a,b; Karanasiou and Uzunoglu, 2005]. An ellipsoidal conductive wall cavity is used for contactless measurements and focusing on the brain areas of interest, whereas the system's attributes are a function of the operation frequency and the geometrical spatial properties of the ellipsoidal beamformer.…”

Section: Introductionmentioning

confidence: 99%

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

Gouzouasis¹,

Karathanasis²,

Karanasiou³

et al. 2010

Bioelectromagnetics

View full text Add to dashboard Cite

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.

show abstract

The effect of using a dielectric matching medium in focused microwave radiometry: an anatomically detailed head model study

Κουτσουπίδου

Groumpas

Karanasiou

et al. 2017

Med Biol Eng Comput

View full text Add to dashboard Cite

Microwave radiometry is a passive technique used to measure in-depth temperature distributions inside the human body, potentially useful in clinical applications. Experimental data imply that it may provide the capability of detecting in-depth local variations of temperature and/or conductivity of excitable tissues at microwave frequencies. Specifically, microwave radiometry may allow the real-time monitoring of brain temperature and/or conductivity changes, associated with local brain activation. In this paper, recent results of our ongoing research regarding the capabilities of focused microwave radiometry for brain intracranial applications are presented. Electromagnetic and thermal simulation analysis was performed using an anatomically detailed head model and a dielectric cap as matching medium placed around it, in order to improve the sensitivity and the focusing attributes of the system. The theoretical results were compared to experimental data elicited while exploring that the sensing depth and spatial resolution of the proposed imaging method at 2.1 GHz areas located 3 cm deep inside the brain can be measured, while at 2.5 GHz, the sensing area is confined specifically to the area of interest. The results exhibit the system's potential as a complementary brain imaging tool for multifrequency in-depth passive monitoring which could be clinically useful for therapeutic, diagnostic, and research applications.

show abstract

A passive 3D imaging thermograph using microwave radiometry

Cited by 17 publications

References 23 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

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

The effect of using a dielectric matching medium in focused microwave radiometry: an anatomically detailed head model study

Contact Info

Product

Resources

About