Motivated by the critical need for complementary and/or alternative modalities to X-ray mammography for early stage breast cancer detection, we have proposed a method of ultrawideband microwave imaging for detecting backscattered energy from small malignant breast tumors. This thesis presents a detailed numerical and experimental investigation of the proposed microwave imaging system. In the pr...

Microwave imaging is one of the most promising techniques in diagnosis and screening of breast cancer and in the medical field that currently under development. It is nonionizing, noninvasive, sensitive to tumors, specific to cancers, and low-cost. Microwave measurements can be carried out either in frequency domain or in time domain. In order to develop a clinically viable medical imaging syst...

Intracranial atherosclerotic disease (ICAD) causes up to 10% of all ischemic strokes, and the rate of recurrent vascular ischemic events is very high. Important predictors of vulnerability in atherosclerotic plaques include the degree of stenosis and the underlying plaque morphology. Vascular wall MRI can provide information about wall structures and atherosclerotic plaque components. High-reso...

PURPOSE To demonstrate a novel contrast mechanism for imaging the vessel wall and vessel wall calcification using susceptibility-weighted imaging (SWI). MATERIALS AND METHODS Eighteen subjects were imaged with multidetector computed tomography (MDCT) and high-resolution SWI at 3T. The SWI imaging parameters were optimized to allow for the best visualization of the femoral artery lumen and the...

This thesis describes a novel approach to microwave imaging. The proposed methods are based on the spectral representation of the object. Regularization schemes for the solution of electromagnetic inverse problems are addressed. An iterative algorithm for the solution of the nonlinear least-squares problem arising in iterative image reconstruction is developed. The application of this algorithm...

Results of theoretical and experimental studies of a GW-class, large diameter microwave oscillator are presented. The device consists of a large cross-section (overmoded), slow-wave structure with a unique profile of wall radius specifically designed to support surface waves and to provide a strong beam-wave coupling at moderate voltage (500 kV), an internal adjustable microwave reflector, a co...

Microwave energy was used to cure polymer coatings on instrument-grade wood. A processing method was developed that included spray coating the polymer onto raw wood panels and pulling the coated panels through a 2.45GHz multi-mode microwave cavity by means of a low-power motor. Materials characterization and testing used to analyze the feasibility of using microwave processing as a coating meth...

OBJECTIVES To evaluate the in vivo efficacy of 915 MHz percutaneous coagulation in the treatment of hepatic artery injury. METHODS After inducing hepatic artery injury, 8 dogs in each group underwent 915 MHz microwave percutaneous coagulation therapy and 8 dogs were injected with batroxobin and α-cyanoacrylate. RESULTS The hemostatic effects of 915 MHz microwave were better than drug inject...

Mg(OH)2 nanoparticles were synthesized by a rapid microwave reaction. The effect of sodium dodecyl sulfonate (SDS as anionic surfactant) and cetyl tri-methyl ammonium bromide (CTAB as cationic surfactant) on the morphology of magnesium hydroxide nanostructures was investigated. Multi wall carbon nano tubes was organo-modified for better dispersion in cellulose acetate matrix. The influence of M...