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• W2035770447 abstract "As classical imaging fails with diffusive media, one way to image a multiple-scattering medium is to achieve local measurements of the dynamic transport properties of a wave undergoing diffusion. This paper presents a method to obtain local measurements of the diffusion constant $D$ in a multiple-scattering medium. The experimental setup consists in an array of programmable transducers placed in front of the multiple-scattering medium to be imaged. By achieving Gaussian beamforming both at emission and reception, an array of virtual sources and receivers located in the near field is constructed. The time evolution of the incoherent component of the intensity backscattered on this virtual array is shown to represent directly the growth of the diffusive halo as $sqrt{Dt}$. A matrix treatment is proposed to separate the incoherent intensity from the coherent backscattering peak. Once the incoherent contribution is isolated, a local measurement of the diffusion constant is possible. The technique is applied to image the long-scale variations of $D$ in a random-scattering sample made of two parts with a different concentration of cylindrical scatterers. This experimental result is obtained with ultrasonic waves around $3phantom{rule{0.3em}{0ex}}mathrm{MHz}$. It illustrates the possibility of imaging diffusive media from local measurements of the diffusion constant, based on coherent Gaussian beamforming and a matrix ``antisymmetrization,'' which creates a virtual antireciprocity." @default.
• W2035770447 created "2016-06-24" @default.
• W2035770447 creator A5038543649 @default.
• W2035770447 creator A5061568415 @default.
• W2035770447 date "2007-02-06" @default.
• W2035770447 modified "2023-09-30" @default.
• W2035770447 title "Ultrasonic imaging of highly scattering media from local measurements of the diffusion constant: Separation of coherent and incoherent intensities" @default.
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• W2035770447 doi "https://doi.org/10.1103/physreve.75.026602" @default.
• W2035770447 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17358431" @default.
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