Hyuk-Je Kim

3D Microwave Breast Imaging Based on Multistatic Radar Concept System

Microwave imaging (MI) is one of the most promising and attractive new techniques for earlier breast-cancer detection. The microwave tomography (MT) realizes configuration of multistatic multiilumination system and reconstructs dielectric properties of the breast by solving a nonlinear inversion scattering problem. We describe below ETRI 3D MT system and 3D MI reconstruction program. Here we demonstrate also examples of image reconstruction using our MT system.

Experimental Measurement System for 3-6 GHz Microwave Breast Tomography

This paper presents an experimental measurement system for 3?6 GHz microwave tomography (MT) of the breast. The measurement system is constructed as a minimal test bed to verify key components such as the sensing antennas, radio frequency (RF) transceiver, sensing mechanism, and image reconstruction method for our advanced MT system detecting breast cancer at an early stage. The test bed has eight RF channels operating at 3 to 6 GHz for high spatial resolution and a two-axis scanning mechanism for three-dimensional measurement. The measurement results from the test bed are shown and discussed.

A Prototype System for Early-Stage Breast Cancer Detection

The early detection of breast cancer is very important. The final goal of this study is to develop an inexpensive portable device for simply detecting the existence of breast cancer using microwaves. In this study, we proposed a detection algorithm and the system configuration of such a device. The feasibility of the proposed method was investigated by numerical simulation and actual measurement. A prototype sensing module was fabricated, and the measurement results for tumor phantoms were presented. The measurement results showed that the prototype sensing module worked well, and the simulation results revealed that the detection rate of the device could be about 60% for a 4 mm tumor and almost 100% for a 6 mm tumor. The proposed device can be used for the self-diagnosis of breast cancer. Further study is required to reduce the size of the sensing module.

Investigation of the realization of a breast-cancer detection system

Earlier detection of breast cancer is very important. The objective of this study is to develop an inexpensive portable device for simply detecting the existence of breast cancer using microwave. In this paper, we investigated the feasibility of the proposed method for such device by actual measurement, and analyzed the possible detection rate dependent on the tumor size by numerical simulation. Measurement results show that the proposed method is quite feasible, and the simulation results reveal that the detection rate of such device could be more than 60 % for tumor of 5 mm size. The proposed device can be used for self-diagnosis of breast cancer. Next step of our study will be the realization of a proto-type system.

Preamplifier Design for fiber-optic mm-wave wireless system

A narrow-band preamplifier for fiber-optic millimeter-wave wireless system is presented based on a fully stabilized 0.12 mum pseudomorphic high electron mobility transistor (PHEMT) technology and is realized in a low-temperature co-fired (LTCC) technology. The preamplifier is designed with parallel feedback and T-section matching networks. These networks are used for narrow-band filtering function and for unconditionally stable of circuits. The preamplifier module, in corporation of four amplifying stages, shows measured transimpedance gain of 53 dBOmega, and return loss of less than -10 dB with a 1 dBOmega, ripple around the center frequency. The transimpedance gain difference between bare chip and module is about 3.5 dBOmega