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The van Cittert-Zernike theorem in pulsed ultrasound-implications for ultrasonic imaging

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2 Author(s)
Mallert, R. ; Lab. Ondes et Acoust., Paris Univ., France ; Fink, M.

A classical theorem of statistical optics, the van Cittert-Zernike theorem, is generalized to pulse-echo ultrasound. This theorem fully describes the second-order statistics of the spatial fluctuations (the spatial covariance) of the field produced by an incoherent source. As a random scattering medium is insonified, it behaves as an incoherent source. The van Cittert-Zernike theorem can thus predict the spatial covariance of the pressure field backscattered by a random medium. Experimental results obtained with a linear array are in good agreement with theoretical expectations. The implications of this theorem in speckle reduction and in focusing in nonhomogeneous media are discussed

Published in:

Ultrasonics Symposium, 1990. Proceedings., IEEE 1990

Date of Conference:

4-7 Dec 1990

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