钟裂×胸忠裂庞-DukeECE.PDF

Microw ave Imaging: Research in Alternative Medical Imaging Mo dalities Vinh Ngo c Nguyen Wednesday, April 26, 2006 1 Abstract Microwave imaging is an alternate breast cancer detection technique that uses microwaves to generate images based on dierences in p ermit- tivity and conductivity. The large dierences in p ermittivity and con- ductivity b etween normal and malignant breast tissue should allow for more reliable detection of breast cancer as opp osed to conventional X-ray techniques. This pro ject aims to develop a 3-D microwave imaging system that utilizes microwaves for breast cancer detection. To date, 3-D microwave imaging hardware has b een develop ed for use in breast cancer detection. This hardware incorp orates 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 go o d system stability and Signal to Noise Ratio (SNR). However, an image has not yet b een 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 op erate in the gigahertz range and will utilize a new RF switching system, simple patch antennas, and a new imaging chamb er design. It is anticipated that a functional microwave imaging system will b e completed by Fall 2006. 1 Intro duction Breast cancer is the leading cause of