Centre National De La Recherche Scientifique

Ecole Superieure De Physique Et De Chimie Industrielles De La Ville De Paris

Supersonic Imagine

Centre National De La Recherche Scientifique-cnrs

William Lambert

Mathias Fink

Alexandre Aubry

Thomas Frappart

Christophe Fraschini

Claude Boccara

Victor Barolle

Amaury Badon

Laura Cobus

Flavien Bureau

Method for non-invasively characterizing a heterogeneous medium using ultrasound, comprising a step of generating a series of incident ultrasonic waves, a step of recording an experimental reflection matrix R(t) defined between the input emission basis (i) and an output reception basis (u), a step of determining a response REP(r,Δr) of the medium between an input virtual transducer (TV) calculated based on an input focusing of the experimental reflection matrix that creates an input focal spot around a first point (P), and an output virtual transducer (TV) calculated based on an output focusing of the experimental reflection matrix that creates an output focal spot around a second point (P), said response being expressed as a function of a central point (PC) of spatial position (r) in the medium located midway between the first and second points (P, P).

Method and system for non-invasively characterizing a heterogeneous medium using ultrasound

Examples relate to a method for processing beamformed data of a medium. The beamformed data includes a first set of beamformed data associated with a first spatial region and a second set of beamformed data associated with a second spatial region, and the method includes estimating the clutter caused by the second spatial region at the first set.

Method and system for processing beamformed data

Method for ultrasonic characterization of a medium, including generating a series of incident ultrasonic waves, generating an experimental reflection matrix R(t) defined between the emission basis (i) as input and a reception basis (u) as output, and determining a focused reflection matrix RFoc(r, r, δt) of the medium between an input virtual transducer (TV) calculated based on a focusing as input to the experimental reflection matrix and an output virtual transducer (TV) calculated based on a focusing as output from the experimental reflection matrix, the responses of the output virtual transducer (TV) being obtained at a time instant that is shifted by an additional delay δt relative to a time instant of the responses of the input virtual transducer (TV).

Method and system for ultrasonic characterization of a medium

Method and system for processing beamformed data preliminary class

Method and system for ultrasonic characterization of a medium Method for ultrasonic characterization of a medium, comprising generating a series of incident ultrasonic waves, generating an experimental reflection matrix Rui(t) defined between the emission basis (i) as input and a reception basis (u) as output, determining a focused reflection matrix RFoc(rin, r, at) of the medium between an input virtual transducer (Win) calculated based on a focusing as input to the experimental reflection matrix and an output virtual transducer (TVout) calculated based on a focusing as output from the experimental reflection matrix, the responses of the output virtual transducer (TVout) being obtained at a time instant that is shifted by an additional delay 6t relative to a time instant of the responses of the input virtual transducer (TVin).

Method for ultrasonic characterization of a medium, comprising generating a series of incident ultrasonic waves, generating an experimental reflection matrix R(t) defined between the emission basis (i) as input and a reception basis (u) as output, and determining a focused reflection matrix RFoc(r, r, &#x3b4;t) of the medium between an input virtual transducer (TV) calculated based on a focusing as input to the experimental reflection matrix and an output virtual transducer (TV) calculated based on a focusing as output from the experimental reflection matrix, the responses of the output virtual transducer (TV) being obtained at a time instant that is shifted by an additional delay &#x3b4;t relative to a time instant of the responses of the input virtual transducer (TV).

The present invention relates to a method for the non-invasive optical characterization of a heterogeneous medium, comprising: a step of illuminating, by means of a series of incident light waves, a given field of view of the heterogeneous medium, positioned in a focal plane of a microscope objective (); a step of determining a first distortion matrix (D, D) in an observation basis defined between a conjugate plane of the focal plane (FP) and an observation plane, said first distortion matrix corresponding, in a correction basis defined between a conjugate plane of the focal plane and an aberration correction plane, to the term-by-term matrix product of a first reflection matrix (R) of the field of view, determined in the correction basis, with the phase conjugate matrix of a reference reflection matrix, defined for a model medium, in said correction basis; and a step of determining, from the first distortion matrix, at least one mapping of a physical parameter of the heterogeneous medium.

Method and systems for the non-invasive optical characterization of a heterogeneous medium

In a first aspect, the present description relates to a system for non-invasively characterizing a heterogeneous medium using ultrasound, comprising at least one first array () of transducers configured to generate a series of incident ultrasound waves in a region of said heterogeneous medium and record the ultrasound waves which are backscattered by said region as a function of time, as well as a computing unit () which is coupled to said at least one first array of transducers and configured to: record an experimental reflection matrix defined between an emission basis at the input and the basis of the transducers at the output; determine, from said experimental reflection matrix, at least one first wideband reflection matrix defined in a focused base at the input and output; determine a first distortion matrix defined between said focused basis and an observation basis, said first distortion matrix resulting, directly or after a change of basis, from the term-by-term matrix product of said first wideband reflection matrix defined between said focused basis and an aberration correction basis, with the phase-conjugated matrix of a reference reflection matrix defined for a model medium, between the same bases; determine, from said first distortion matrix, at least one mapping of a physical parameter of said heterogeneous medium.

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Ivry sur Seine, France

William Lambert