Dynamic coherent backscattering of ultrasound in three-dimensional strongly-scattering media

Cobus, Laura A.; Tiggelen, B. A. van; Derode, Arnaud; Page, John H.

doi:10.1140/epjst/e2016-60340-3

Cited by 8 publications

(4 citation statements)

References 26 publications

(64 reference statements)

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“…The internal reflection coefficient R int was estimated using a method based on the work of Refs. 37,43,[50][51][52] , and its impact on the data analysis is discussed in Appendix A.…”

Section: Self-consistent Theory Calculationsmentioning

confidence: 99%

Transverse confinement of ultrasound through the Anderson transition in three-dimensional mesoglasses

et al. 2018

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We report an in-depth investigation of the Anderson localization transition for classical waves in three dimensions (3D). Experimentally, we observe clear signatures of Anderson localization by measuring the transverse confinement of transmitted ultrasound through slab-shaped mesoglass samples. We compare our experimental data with predictions of the self-consistent theory of Anderson localization for an open medium with the same geometry as our samples. This model describes the transverse confinement of classical waves as a function of the localization (correlation) length, ξ (ζ), and is fitted to our experimental data to quantify the transverse spreading/confinement of ultrasound all of the way through the transition between diffusion and localization. Hence we are able to precisely identify the location of the mobility edges at which the Anderson transitions occur.

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“…The internal reflection coefficient R int was estimated using a method based on the work of Refs. 37,43,[50][51][52] , and its impact on the data analysis is discussed in Appendix A.…”

Section: Self-consistent Theory Calculationsmentioning

confidence: 99%

Transverse confinement of ultrasound through the Anderson transition in three-dimensional mesoglasses

et al. 2018

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“…The perspective of this work is to extract from ρðrÞ quantitative maps of scattering parameters, such as the elastic mean free path or the absorption length [24,40], and transport parameters, such as the transport mean free path [62,68,69] or the diffusion coefficient [62,63,70]. While diffuse tomography in transmission provides only a macroscopic measurement of such parameters, preliminary studies demonstrate how a reflection matrix recorded at the surface can provide transverse measurements of transport parameters [31,32,65,71].…”

Section: Discussionmentioning

confidence: 99%

Reflection Matrix Approach for Quantitative Imaging of Scattering Media

et al. 2020

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We present a physically intuitive matrix approach for wave imaging and characterization in scattering media. The experimental proof of concept is performed with ultrasonic waves, but this approach can be applied to any field of wave physics for which multielement technology is available. The concept is that focused beam forming enables the synthesis, in transmit and receive, of an array of virtual transducers which map the entire medium to be imaged. The interelement responses of this virtual array form a focused reflection matrix from which spatial maps of various characteristics of the propagating wave can be retrieved. Here we demonstrate (i) a local focusing criterion that enables the image quality and the wave velocity to be evaluated everywhere inside the medium, including in random speckle, and (ii) a highly resolved spatial mapping of the prevalence of multiple scattering, which constitutes a new and unique contrast for ultrasonic imaging. The approach is demonstrated for a controllable phantom system and for in vivo imaging of the human abdomen. More generally, this matrix approach opens an original and powerful route for quantitative imaging in wave physics.

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“…Conversely, because ρ(r) is independent of noise, it can constitute a useful biomarker for medical imaging deep inside tissue, and a potentially valuable tool for future research seeking to characterize multiple scattering media, even at large depths where I N becomes important. The perspective of this work will be to extract from ρ(r) quantitative maps of scattering parameters such as the elastic mean free path or the absorption length [20,34], and transport parameters such as the transport mean free path [55,59,60] or the diffusion coefficient [55,56,61]. While diffuse tomography in transmission only provides a macroscopic measurement of such parameters, preliminary studies have demonstrated how a reflection matrix recorded at the surface can provide transverse measurements of transport parameters [25,26,58,62].…”

Section: Discussionmentioning

confidence: 99%

Reflection matrix approach for quantitative imaging of scattering media

Lambert,

Cobus,

Couade

et al. 2019

Preprint

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We present a physically intuitive matrix approach for wave imaging and characterization in scattering media. The experimental proof-of-concept is performed with ultrasonic waves, but this approach can be applied to any field of wave physics for which multi-element technology is available. The concept is that focused beamforming enables the synthesis, in transmit and receive, of an array of virtual transducers which map the entire medium to be imaged. The inter-element responses of this virtual array form a focused reflection matrix from which spatial maps of various characteristics of the propagating wave can be retrieved. Here we demonstrate: (i) a local focusing criterion that enables the imaging quality to be evaluated everywhere inside the medium, including in random speckle; (ii) a tomographic measurement of wave velocity, which allows for aberration corrections in the original image; (iii) an highly resolved spatial mapping of the prevalence of multiple scattering, which constitutes a new and unique contrast for ultrasonic imaging. More generally, this matrix approach opens an original and powerful route for quantitative imaging in wave physics.

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Dynamic coherent backscattering of ultrasound in three-dimensional strongly-scattering media

Cited by 8 publications

References 26 publications

Transverse confinement of ultrasound through the Anderson transition in three-dimensional mesoglasses

Transverse confinement of ultrasound through the Anderson transition in three-dimensional mesoglasses

Reflection Matrix Approach for Quantitative Imaging of Scattering Media

Reflection matrix approach for quantitative imaging of scattering media

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