Probing the speckle to estimate the effective speed of sound, a first step towards quantitative ultrasound imaging

Abstract: We present a mathematical model and analysis for a new experimental method [Bureau and al., arXiv:2409.13901, 2024] for effective sound velocity estimation in medical ultrasound imaging.  Using recent results on stochastic homogenization of the Helmholtz equation, we provide a representation formula for the field scattered by a random multi-scale medium (whose acoustic behavior is similar to a biological tissue) in the time harmonic regime.  We then prove that  statistical moments of the imaging function can be accessed from data collected with only one realization of the medium.  We show that it is possible to locally extract the point spread function from an image constituted only of speckle and build an estimator for the effective sound velocity in the micro-structured medium. 

Le mardi 3 juin 2025 à 11h00 / Amphithéâtre François Canac, LMA

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