Supersonic Imagine

Centre National De La Recherche Scientifique

Centre Hospitalier De L'universite De Montreal

David Savery

Claude Cohen-Bacrie

Jeremy Bercoff

Mathias Fink

Jean-Luc Gennisson

Mickael Tanter

Jérémy Bercoff

Jacques Souquet

Mathieu Pernot

Mickaël Tanter

Ralph Sinkus

Guy Cloutier

Emilie Franceschini

François Yu

Michaël Tanter

Jean-Luc Gennison

Claude Cohen-bacrie

A method for measuring a mean visco-elasticity value for a soft material using a single probe carrying at least one transducer includes inducing, in a constraint zone, at least one burst of mechanical vibrations in order to generate internal shear waves in the tissue propagating from the constraint zone into the tissue, measuring, with the transducer, transient tissue displacements in at least one first measurement zone in the tissue, the first measurement zone being located away from the constraint zone, and estimating a mean visco-elasticity of the region of the tissue situated between the constraint zone and the first measurement zone from the measured transient tissue displacements of the tissue in the first measurement zone.

Method and device for measuring a mean value of visco-elasticity of a region of interest

The method includes excitation during which an internal mechanical stress is generated in an excitation zone, and imaging by acquiring signals during movements generated by the mechanical stress in the visco-elastic medium in response to the internal mechanical stress in an. imaging zone that includes the excitation zone. The method further includes calculating a quantitative index associated with the rheological properties of the visco-elastic medium at least at one point of the imaging zone situated at a given depth outside the excitation zone. The quantitative index is representative of a comparison between signals acquired during the movements generated in response to the mechanical stress at least at one point of the excitation zone situated at the given depth, and signals acquired during the movements generated in response to the mechanical stress at at least the point of the imaging zone situated outside the excitation zone.

Method and a device for imaging a visco-elastic medium

The invention relates to a method and a device for imaging a visco-elastic medium (). The method comprises an excitation step during which an internal mechanical stress is generated in an excitation zone [A] and an imaging step of acquiring signals during the movements generated by the mechanical stress in the visco-elastic medium () in response to the internal mechanical stress in an imaging zone [B] that includes the excitation zone [A]. According to the invention, the method further comprises a step of calculating a quantitative index [Cij] associated with the rheological properties of the visco-elastic medium () at at least one point [Bij] of the imaging zone situated at a given depth outside the excitation zone [A].

A method for measuring a mean visco-elasticity value for a soft material uses a single probe carrying at least one transducer. At least one burst of mechanical vibrations is induced in a constraint zone in order to generate internal shear waves in the tissue propagating from the constraint zone into the tissue. The transient tissue displacements are measured with a transducer in at least one first measurement zone in the tissue, the first measurement zone being located away from the constraint zone. A mean visco-elasticity of the region of the tissue situated between the constraint zone and the first measurement zone is estimated from the measured transient tissue displacements of the tissue in the first measurement zone.

Method and device for measuring velocity of shear waves in biological tissue

The invention relates to a method for measuring a mean visco-elasticity value for a soft material. The method uses a single probe carrying at least one transducer and includes the steps of: (a) inducing, in a constraint zone, at least one burst of mechanical vibrations in order to generate internal shear waves in the tissue propagating from the constraint zone into the tissue, (b1) measuring, with the transducer, the transient tissue displacements in at least one first measurement zone in the tissue, and wherein the first measurement zone is located away from the constraint zone, and (c) estimating a mean visco-elasticity of the region of the tissue situated between the constraint zone and the first measurement zone from the measured transient tissue displacements of the tissue in the first measurement zone.

Method for rheological characterization of a viscoelastic medium, with the following steps: (a) an excitation step during which a vibratory excitation is generated in the viscoelastic medium leading to a deformation of the medium, (b) a deformation measurement step during which the deformation of the medium caused by the excitation is observed, (c) and a characterization step during which at least one non-zero power parameter y is determined such that a rheological parameter of the medium x is equal to x(f)=a+b&#xb7;f, where f is the frequency, a is a real number and b a non-zero scale parameter. It is thus possible to obtain mapping of the power parameter y.

Method for rheological characterization of a viscoelastic medium

The present invention relates to a method for generating mechanical waves within a viscoelastic medium () comprising a step of generating an acoustic radiation force () within the viscoelastic medium () by application of acoustic waves focused on an interface () delimiting two zones () having distinct acoustic properties.

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Cabries, France

David Savery