An adaptive ultrasonic array imaging technique aiming at reconstruction of the diffraction-limited images of general objects even through an inhomogeneous layer is proposed. The special feature of the system is the estimation of the complex amplitude distribution of the inhomogeneity by measuring the degree of focusing, that is, by measuring the degree of correlation between the transmitted signals and the signals reflected from the object under observation. The construction of a proper measure function, an iterative procedure for the estimation of the inhomogeneity, and the imaging method that uses the estimated inhomogeneity are discussed in detail. The effectiveness of the method is verified both by numerical analyses and experiments.
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Hirama et al. (1982) studied this question.