Microwave Imaging: Research in Alternative Medical Imaging Modalities

Microwave imaging is an alternate breast cancer detection technique that uses microwaves to generate images based on di erences in permittivity and conductivity. The large di erences in permittivity and conductivity between normal and malignant breast tissue should allow for more reliable detection of breast cancer as opposed to conventional X-ray techniques. This project aims to develop a 3-D microwave imaging system that utilizes microwaves for breast cancer detection. To date, 3-D microwave imaging hardware has been developed for use in breast cancer detection. This hardware incorporates folded patch antennas, acetone/isopropyl alcohol matching uid, an RF multiplexer switching system, and C++-based control software. Testing has shown that the hardware exhibits good system stability and Signal to Noise Ratio (SNR). However, an image has not yet been successfully reconstructed from measurements made using the microwave imaging hardware. Future work will involve the assembly of a new hardware system for microwave imaging that addresses many of the aws discovered in the current microwave imaging hardware. This system will operate in the gigahertz range and will utilize a new RF switching system, simple patch antennas, and a new imaging chamber design. It is anticipated that a functional microwave imaging system will be completed by Fall 2006.