Dual-polarization correlation radiometry system for microwave imaging of heat sources of biological tissues

2016 ◽  
Author(s):  
Rae-Seoung Park ◽  
Byeongdeok Park ◽  
Byambaakhuu Batnairamdal ◽  
Changyul Cheon
Keyword(s):  
Biological Tissues ◽  
Microwave Imaging ◽  
Heat Sources ◽  
Dual Polarization ◽  
Polarization Correlation

scholarly journals Reference Breast Phantoms for Low-Cost Microwave Imaging

2020 ◽  
Vol 14 (4) ◽  
pp. 411-415
Author(s):  
Emine Avşar Aydin ◽  
Selin Yabaci Karaoğlan
Keyword(s):  
Breast Cancer ◽  
Low Cost ◽  
Microwave Frequency ◽  
Biological Tissues ◽  
Microwave Imaging ◽  
Vector Network Analyzers ◽  
Network Analyzers ◽  
Computer Based ◽  
Breast Phantoms ◽  
Inverse Radon Transform

Microwave imaging provides an alternative method for breast cancer screening and the diagnosis of cerebrovascular accidents. Before a surgical operation, the performance of microwave imaging systems should be evaluated on anatomically detailed anthropomorphic phantoms. This paper puts forward the advances in the development of breast phantoms based on 3D printing structures filled with liquid solutions that mimic biological tissues in terms of complex permittivity in a wide microwave frequency band. In this paper; four different experimental scenarios were created, and measurements were performed, and although there are many vector network analyzers on the market, the miniVNA used in this study has been shown to have potential in many biomedical applications such as portable computer-based breast cancer detection studies. We especially investigated the reproducibility of a particular mixture and the ability of some mixes to mimic various breast tissues. Afterwards, the images similar to the experimentally created scenarios were obtained by implementing the inverse radon transform to the obtained data.

scholarly journals Anthropomorphic Breast and Head Phantoms for Microwave Imaging

Diagnostics ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 85 ◽  
Author(s):  
Nadine Joachimowicz ◽  
Bernard Duchêne ◽  
Christophe Conessa ◽  
Olivier Meyer
Keyword(s):  
Liquid Mixtures ◽  
Biological Tissues ◽  
Microwave Imaging ◽  
Breast Cancer Imaging ◽  
Minimization Method ◽  
Fluid Mixture ◽  
Breast Phantom ◽  
Brain Stroke ◽  
The Cost ◽  
Triton X

This paper deals with breast and head phantoms fabricated from 3D-printed structures and liquid mixtures whose complex permittivities are close to that of the biological tissues within a large frequency band. The goal is to enable an easy and safe manufacturing of stable-in-time detailed anthropomorphic phantoms dedicated to the test of microwave imaging systems to assess the performances of the latter in realistic configurations before a possible clinical application to breast cancer imaging or brain stroke monitoring. The structure of the breast phantom has already been used by several laboratories to test their measurement systems in the framework of the COST (European Cooperation in Science and Technology) Action TD1301-MiMed. As for the tissue mimicking liquid mixtures, they are based upon Triton X-100 and salted water. It has been proven that such mixtures can dielectrically mimic the various breast tissues. It is shown herein that they can also accurately mimic most of the head tissues and that, given a binary fluid mixture model, the respective concentrations of the various constituents needed to mimic a particular tissue can be predetermined by means of a standard minimization method.

scholarly journals Development of a 3D Anthropomorphic Phantom Generator for Microwave Imaging Applications of the Head and Neck Region

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 2029
Author(s):  
Ana Catarina Pelicano ◽  
Raquel C. Conceição
Keyword(s):  
Head And Neck ◽  
Imaging Techniques ◽  
Neck Region ◽  
Biological Tissues ◽  
Magnetic Resonance Images ◽  
Microwave Imaging ◽  
Cervical Region ◽  
Cervical Lymph Nodes ◽  
Initial Development ◽  
Body Regions

The development of 3D anthropomorphic head and neck phantoms is of crucial and timely importance to explore novel imaging techniques, such as radar-based MicroWave Imaging (MWI), which have the potential to accurately diagnose Cervical Lymph Nodes (CLNs) in a neoadjuvant and non-invasive manner. We are motivated by a significant diagnostic blind-spot regarding mass screening of LNs in the case of head and neck cancer. The timely detection and selective removal of metastatic CLNs will prevent tumor cells from entering the lymphatic and blood systems and metastasizing to other body regions. The present paper describes the developed phantom generator which allows the anthropomorphic modelling of the main biological tissues of the cervical region, including CLNs, as well as their dielectric properties, for a frequency range from 1 to 10 GHz, based on Magnetic Resonance images. The resulting phantoms of varying complexity are well-suited to contribute to all stages of the development of a radar-based MWI device capable of detecting CLNs. Simpler models are essential since complexity could hinder the initial development stages of MWI devices. Besides, the diversity of anthropomorphic phantoms resulting from the developed phantom generator can be explored in other scientific contexts and may be useful to other medical imaging modalities.

scholarly journals A Simulation-Based Methodology of Developing 3D Printed Anthropomorphic Phantoms for Microwave Imaging Systems

Diagnostics ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 376
Author(s):  
Soroush Abedi ◽  
Nadine Joachimowicz ◽  
Nicolas Phillips ◽  
Hélène Roussel
Keyword(s):  
Biological Tissues ◽  
Wide Frequency Range ◽  
Microwave Imaging ◽  
3 Dimensional ◽  
Simulation Based ◽  
Liquid Solutions ◽  
Experimental Parameters ◽  
Anthropomorphic Phantoms ◽  
3D Printed ◽  
Coupling Medium

This work is devoted to the development and manufacturing of realistic benchmark phantoms to evaluate the performance of microwave imaging devices. The 3D (3 dimensional) printed phantoms contain several cavities, designed to be filled with liquid solutions that mimic biological tissues in terms of complex permittivity over a wide frequency range. Numerical versions (stereolithography (STL) format files) of these phantoms were used to perform simulations to investigate experimental parameters. The purpose of this paper is two-fold. First, a general methodology for the development of a biological phantom is presented. Second, this approach is applied to the particular case of the experimental device developed by the Department of Electronics and Telecommunications at Politecnico di Torino (POLITO) that currently uses a homogeneous version of the head phantom considered in this paper. Numerical versions of the introduced inhomogeneous head phantoms were used to evaluate the effect of various parameters related to their development, such as the permittivity of the equivalent biological tissue, coupling medium, thickness and nature of the phantom walls, and number of compartments. To shed light on the effects of blood circulation on the recognition of a randomly shaped stroke, a numerical brain model including blood vessels was considered.

scholarly journals Method for dynamic measurement of thermal diffusivity during laser soldering of biological tissues

2021 ◽  
Vol 2091 (1) ◽  
pp. 012022
Author(s):  
D I Ryabkin ◽  
V V Molodykh ◽  
A Yu. Gerasimenko
Keyword(s):  
Thermal Diffusivity ◽  
Biological Tissue ◽  
Biological Tissues ◽  
Dynamic Measurement ◽  
Diffusivity Coefficient ◽  
Heat Sources ◽  
Thermal Diffusivity Coefficient ◽  
Laser Soldering ◽  
Diffusivity Equation ◽  
Maximum Heating

Abstract In this paper, we propose a method for dynamic measurement of the thermal diffusivity coefficient during laser soldering of biological tissues. The method is based on modelling the function of temperature dependence on time during cooling of biological tissue after exposure to laser radiation. The simulation is carried out by solving the heat equation for a homogeneous biological tissue and the absence of external heat sources. The desired value of the thermal diffusivity coefficient was determined by optimizing the residual functional of the temperature functions from time obtained experimentally and by solving the thermal diffusivity equation. Experiments were carried out to measure the thermal diffusivity coefficient by the proposed method for myocardial and skin tissues at maximum heating temperatures of 40, 50, 60 °C. The measured values of the thermal diffusivity coefficient for the myocardium are in the range from 2.3 to 2.7 m2/s*10-6, and for the skin from 1.5 to 1.7 m2/s*10-6.

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