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...

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...

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...

Using microwave currents, we excite resonances of geometrically confined pinned domain walls, detecting the resonance by the rectification of the microwave current. By applying magnetic fields, the resonance frequency of the domain wall oscillator can be tuned over a wide range. Increasing the power leads to a redshift due to the nonlinearity of the system. From this frequency shift, we directl...