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A procedure using microwave transmission to estimate the absolute value of lung water content is described. The method involves obtaining a transverse cross‐sectional image of a human subject using a computerized axial tomographic X ray scanner, with the microwave applicators in position. The electromagnetic field problem, including the size and shape of the internal organs, is then solved numerically using the method of moments. Since the mismatch between the microwave applicators and the patient's skin is found to be highly insensitive to the changes in the underlying lung parenchyma, the transmission coefficient can then be directly related to the average amount of total water content in the lung. Results for human and animal cross sections are presented.
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Iskander et al. (1982) studied this question.
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