Microwave radiometry in living tissue: what does it measure?

The sensitivity of microwave radiometry for detecting subcutaneous targets was studied both experimentally and theoretically. The radiometer used a dielectric loaded rectangular waveguide antenna in contact with a lossy dielectric medium. A cylindrical target with dielectric properties and/or temperature different from that of the surrounding medium was located beneath this surface. The results indicate that microwave radiometry responds to the temperature averaged over the field pattern of the antenna with very strong weighting of regions near the surface. A simple quasi-static analysis provides a good indication of the sensitivity of the technique for detecting cylindrical targets whose dielectric properties are different from those of the surrounding medium.<<ETX>>

[1]  J. B. Leonard,et al.  Depth of Penetration of Fields from Rectangular Apertures Into Lossy Media (Short Paper) , 1987 .

[2]  J. Edrich,et al.  Centimeter- and millimeter-wave thermography--a survey on tumor detection. , 1979, The Journal of microwave power.

[3]  Ahmed Mamouni,et al.  Microwave radiometric imaging at 3 GHz for the exploration of breast tumors , 1990 .

[4]  R. Jain,et al.  TEMPERATURE DISTRIBUTIONS IN NORMAL AND NEOPLASTIC TISSUES DURING NORMOTHERMIA AND HYPERTHERMIA * , 1980, Annals of the New York Academy of Sciences.

[5]  A. Mamouni,et al.  Simultaneous microwave local heating and microwave thermography. Possible clinical applications. , 1979, The Journal of microwave power.

[6]  A. W. Guy,et al.  Electromagnetic Fields and Relative Heating Patterns Due to a Rectangular Aperture Source in Direct Contact with Bilayered Biological Tissue , 1971 .

[7]  A. Mamouni,et al.  Introduction to correlation microwave thermography. , 1983 .

[8]  T. Sugiura,et al.  A Three-Band Microwave Radiometer System for Noninvasive Measurement of the Temperature at Various Depths , 1986, 1986 IEEE MTT-S International Microwave Symposium Digest.

[9]  J. Shaeffer,et al.  Dual Mode Microwave System to Enhance Early Detection of Cancer , 1980 .

[10]  C. Pichot,et al.  Electrical characteristics of waveguide applicators for medical applications. , 1980, The Journal of microwave power.

[11]  Y. Leroy,et al.  Clinical Applications Of Microwave Thermography , 1980, Other Conferences.

[12]  B. Enander,et al.  Microwave radiometric measurements of the temperature inside a body , 1974 .

[13]  A. H. Barrett,et al.  Subcutaneous temperatures: a method of noninvasive sensing , 1975, Science.

[14]  A. H. Barrett,et al.  MICROWAVE THERMOGRAPHY OF NORMAL AND CANCEROUS BREAST TISSUE * , 1980, Annals of the New York Academy of Sciences.

[15]  Y. Leroy,et al.  Combination of Local Heating and Radiometry by Microwaves , 1980, IEEE Transactions on Instrumentation and Measurement.

[16]  M. Gautherie,et al.  Millimeter-wave thermography: preliminary clinical findings in head and neck diseases. , 1979, The Journal of microwave power.

[17]  P. C. Hardee,et al.  Thermography at millimeter wavelengths , 1974 .

[18]  F. Sterzer,et al.  A Self-Balancing Microwave Radiometer for Non-Invasively Measuring the Temperature of Subcutaneous Tissues During Localized Hyperthermia Treatments of Cancer , 1982, 1982 IEEE MTT-S International Microwave Symposium Digest.

[19]  K R Foster,et al.  Heat transport mechanisms in vascular tissues: a model comparison. , 1986, Journal of biomechanical engineering.

[20]  I. V. Lindell,et al.  Effect of Skin in Microwave Detection of Breast Cancer , 1986 .

[21]  Kenneth R. Holmes,et al.  MICROVASCULAR CONTRIBUTIONS IN TISSUE HEAT TRANSFER , 1980, Annals of the New York Academy of Sciences.

[22]  A. W. Guy,et al.  Analyses of Electromagnetic Fields Induced in Biological Tissues by Thermographic Studies on Equivalent Phantom Models , 1971 .

[23]  K. L. Carr,et al.  Microwave radiometry: its importance to the detection of cancer , 1989 .