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Temperature profiling in biological objects with multifrequency microwave radiometry

A method of temperature profiling in biological objects is described. In this method, thermal radiation from the object is measured as the brightness temperature by a multi-channel, topically five, 1 - 4 GHz radiometer via a contact-type, dielectric loaded waveguide antenna with a 15 X 20 mm2 aperture. Coupling between the antenna and the object is analyzed under 1-dimensional approximation. The radiometric data are analyzed by a combined method of model fitting and Monte Carlo techniques to retrieve a temperature profile in tissue and its 2 (sigma) -intervals along the axis of the antenna view field. The method has been tested by numerical simulation and agar phantom experiments to demonstrate its capability of temperature profiling in muscle with 2(sigma) <EQ 1.5 K over a depth range of 0 - 4 cm from the body surface using a radiometer with brightness temperature resolution of 0.05 - 0.07 K.