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The performance of the proposed PSO-EIT is evaluated in terms of fidelity measures, such as total relative error and signal to noise ratio (SNR) and the experimental results are compared with other known techniques such as genetic algorithm and modified Newton - Raphson (MNR) method. We propose and analyze a novel shape-reconstruction technique for the early detection of breast cancer from microwave data which is based on a level-set technique. Special topics include a summary of the significant recent advances in theories of counterion polarization effects, dielectric properties of cancer vs. normal tissues, properties of low-water-content tissues, and macroscopic field-coupling considerations. Then, the unknown profile is represented in the form of steps built on the interfaces, with the step amplitudes being determined from a linear integral equation. projections obtained by conventional ISAR. Request the chapter directly from the author on ResearchGate. En savoir plus et paramétrer les cookies, Livraison Suivie : The algorithms are based on an integral equation approach. Furthermore, the single- and multilayer lesion models are used to characterize a distinct mass region followed by a sharp transition to background, and a blurred mass border exhibiting a gradual transition to background, respectively. Since the method does not need analytical or numerical approximations of the forward model, it is particularly valuable in near-field imaging. It is shown how this approach, usually employed at optical frequencies, can be adapted to image breast tumors at microwave frequencies. In general, failure to detect or correctly characterize breast cancer can be attributed to one of four main factors: inherent limitations of screen-film mammography, inadequate radiographic technique, subtle or unusual lesion characteristics, and interpretation error. The main motivation behind this approach is due to its robustness in solving continuous non-linear problem and generation of superior solutions with less computational time and more stable convergence characteristics than other stochastic methods performance [13][14][19][20][21], A problem of scattering from some buried inclusions under a rough compare well with A new prototype of a tomographic system for microwave imaging is presented in this paper. There was an error retrieving your Wish Lists. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 4–8, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). The curved launching plane is connected to the central conductor of the coaxial feed. The applications of the proposed method can vary from medical imaging to nondestructive testing of materials and structures.

The purpose of this study was to construct a microwave tomographic system capable of conducting experiments with whole scale biological objects and to demonstrate the feasibility of microwave tomography for imaging such objects using a canine model. In order to initially evaluate the feasibility of the proposed approach, numerical results in a simulated environment are preliminarily considered and discussed. The method has been validated for various MWI measurement scenarios. Then you can start reading Kindle books on your smartphone, tablet, or computer - no Kindle device required. The integral relationships of the inverse scattering problem are discretized and solved by an Inexact-Newton method, which has been found to be very effective in solving ill-posed inverse problems. Also, it is observed that benign tumors exhibit sharp images with well-defined borders, whereas malignant tumors show fuzzy and blurred boundaries. Top subscription boxes – right to your door, © 1996-2020, Amazon.com, Inc. or its affiliates. It exploits multi-frequency data and does not require that the transmitter and receivers are synchronized, making the source non-cooperative. Book by Larsen, Lawrence E., Jacobi, John H. To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. 1. The robustness of the deformable reflector-based tomography technique in imaging the spatial distribution of the tissue dielectric property in the presence of measurement noise is investigated using first-order Tikhonov regularization.

These original papers have been supplemented by reports of related work (Guo et al., Slaney et al.) We propose the use of microbubbles as a dielectric contrast agent for enhancing the sensitivity of MI-TAT for breast cancer detection. The inversion technique has been successfully applied to reconstruct layered building constructions using real experimental data in the conditions of poor resolution and weak response of the reconstructed interface. The effectiveness of the DMAS algorithm is shown by applying it to backscattered signals received from a variety of numerical breast phantoms. The developed experimental apparatus is validated in this paper by means of several numerical simulations. We have found that the band below 1 GHz was of paramount importance for the correct imaging, while we did not observe significant advantages in including the band between 1 and 9 GHz. This suggests the possibility of detecting leukemia or monitoring the treatment of leukemia by electromagnetic imaging. The method is based on a scattering model derived from the equivalence theorem for electromagnetic radiation. observation depth. As ground-penetrating radar (GPR) technology improves, there is an increasing demand for more sophisticated and detailed interpretational tools. Microwave-induced thermoacoustic tomography (MI-TAT) is an imaging technique that exploits dielectric contrast at microwave frequencies while creating images with ultrasound resolution. Moreover, this groundbreaking resource details computational methods that can be used to solve inverse problems related to specific applications. Techniques utilizing electromagnetic energy at microwave and optical frequencies have been shown to be promising for breast cancer detection and diagnosis. Furthermore, an inversion procedure able to address the full underlying non-linear inverse scattering problem is introduced. The designed antenna is first individually tested in the anechoic chamber, and its directivity along with the radiation pattern is obtained. In addition, as they tackle the nonlinear problem through a local optimization scheme, they are prone to the occurrence of false solutions, which is an obviously detrimental outcome in any imaging application, but it is even worse in medical applications. Pour calculer l'évaluation globale en nombre d'étoiles et la répartition en pourcentage par étoile, nous n'utilisons pas une moyenne simple. The object under study was located in the central area of the tomographic chamber filled with a salt solution. dielectric materials; electromagnetism; microwave imaging, ... Techniques to improve the spatial resolution [16,17] and human discrimination [18,19] have also been proposed, through frequency spectral analysis. First, the structure of each phantom is identified by applying image processing techniques to the MRI.

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for Sugar Distribution Imaging inside a Fruit, The Application Research of Microwave Imaging in Nondestructive Testing of Concrete Wall, Element-Free Galerkin Method in Modeling Microwave Inspection of Civil Structures, Experimental Tests of Microwave Breast Cancer Detection on Phantoms, Contrast-enhanced microwave breast imaging, Microwave imaging of foreign bodies inside wood trunks, Effect of Lesion Morphology on Microwave Signature in 2-D Ultra-Wideband Breast Imaging, Development of Anatomically Realistic Numerical Breast Phantoms With Accurate Dielectric Properties for Modeling Microwave Interactions With the Human Breast, Toward contrast-enhanced microwave-induced thermoacoustic imaging of breast cancer: An experimental study of the effects of microbubbles on simple thermoacoustic targets, Electromagnetic Spectroscopy of Normal Breast Tissue Specimens Obtained From Reduction Surgeries: Comparison of Optical and Microwave Properties, Confocal Microwave Imaging for Breast Cancer 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Linear and Nonlinear Microwave Tomography Approaches for Subsurface Prospecting: Validation on Real Data, An ultrawide-band microwave radar sensor for nondestructive evaluation of pavement subsurface, Subsurface detection and discrimination of buried objects group using remote sensing technique, Profile soil moisture estimation using the modified IEM, Expermental Study of Microwave Transmission in Snowpack.

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