This paper reports a novel method of in-vitro thyroid function analysis based on the measurement of the dielectric properties of blood at microwave frequencies. The measurements were made using rectangular cavity perturbation technique at the S-band of microwave frequency with the different samples obtained from healthy donors as well as from patients. It is observed that an appreciably change in the dielectric properties of patient samples with that of nor-mal healthy samples and this measurements are in good agreement with clinical analysis. These results indicate an al-ternative in-vitro method of diagnosing thyroid abnormalities using microwaves.
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