Improvements in Techniques of Microwave Thermography
Abstract
During the period 15 November 1984 to 30 June 1985 our efforts continued to make bistatic observations whereby the scattered radiation from an embedded object is studied as a function of the size of the scattering object relative to the wavelength of the radiation to assess the proper wavelength for hyperthermia treatment of malignant tumors. Passive microwave thermography for breast cancer detection uses a radiometer to measure the thermal patterns of the breast. Thermal radiation from the body couples into the system through an antenna. With reflection-compensating radiometer, the emissivity at the antenna- human tissue interface can be measured. A change in the dielectric properties of what lies beneath the skin can change the measured reflection coefficient at the antenna. Abnormal thermal patterns and possibly anomalous dielectric constants may indicate the presence of disease. Measuring all three types of data - emissivity, temperature and scattering - should provide additional information about tumor size and composition, and the appropriate frequency for hyperthermia.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1987
- Accession Number
- ADA197065
Entities
People
- Alan H. Barrett
Organizations
- Massachusetts Institute of Technology