Abstract: The present invention relates to a method for analysing a region of interest of a viscoelastic medium, the method including a step (200) of acquiring signals representative of the movement of at least one shear-propagation component and of a static-deformation component, and a processing step (300) for determining at least one property of the medium, the processing step comprising the following sub-steps: # determining images of the region of interest: # estimating images of movement by comparing images of the region of interest: # filtering the images of movement to attenuate the statis-deformation component; # determining a property of the medium from the filtered images of movement.

Abstract: A probe for measuring the viscoelastic properties of a medium of interest, the probe including a housing, a transducer array for emitting high-frequency ultrasonic waves and receiving acoustic echoes, at least one inertial vibration exciter including a fixed part mechanically integral with the transducer array, a mobile part capable of moving relative to the fixed part to produce vibrations in order to generate the low-frequency elastic wave, wherein the mobile part includes at least one permanent magnet, the at least one inertial vibration exciter including an additional inertial mass distributed around the permanent magnet.

Abstract: A probe for measuring the viscoelastic properties of a human or animal medium of interest, such as a liver, said measurement consisting of generating at least one low-frequency elastic wave in the medium of interest, simultaneously with the generation of the low-frequency wave: emitting high-frequency ultrasonic waves, and receiving acoustic echoes due to the reflections of the ultrasonic waves in the medium of interest, the probe including a housing, a transducer array for emitting high-frequency ultrasonic waves and receiving acoustic echoes, wherein the probe further comprises at least one inertial vibration exciter including a fixed part mechanically integral with the transducer array, a mobile part capable of moving relative to the fixed part to produce vibrations in order to generate the low-frequency elastic wave.

Abstract: The present invention relates to a method for analysing a medium using an array of transducers (T1-Tn), the method comprising: —acquiring (100) two reception signals each associated with a respective pair of waves transmitted and received according to transmission and reception directions; —deforming (200) the two reception signals to obtain two deformed signals, the deformation step comprising, for each reception signal, composition of the reception signal with an affine function dependent on half the angular difference between the transmission and reception directions of the pair associated with the reception signal; —locally estimating (300) the speed of sound in a region of interest of the medium based on the comparison of the two deformed signals.

Abstract: An apparatus for estimating a velocity of at least one scatterer in a medium, the apparatus including a curved array of virtual transducers (T1-Tn) for emitting Archimedean spiral waves in a plurality of predetermined directions of propagation defined by a set of insonification angles, and for receiving, from the at least one scatterer, scattered signals generated by scattering of the Archimedean spiral waves emitted from the curved array of virtual transducers, a driving and processing unit (Uc) for estimating the velocity of the at least one scatterer.

Abstract: The present invention relates to a method and device for analysing a medium based on: —emitting plane or spiral emission waves (Oinc1) each having a respective emission angle, —receiving reception signals representative of plane or spiral reception waves (Orec1) each having a respective reception angle, each reception signal including a singly scattered component and a multiply scattered component, —processing the reception signals to extract the singly scattered component and/or the multiply scattered component of said reception signals.

Abstract: The present invention concerns an array processing image reconstruction method comprising: receiving a set of echo waveforms as measurements from the object of interest; defining a measurement model linking an unknown image of the object to the measurements; defining a data fidelity functional using the measurement model; defining a regularisation functional using a trained non-linear mapping, the regularisation functional comprising prior knowledge about the unknown image; defining an optimisation problem involving the data fidelity functional and the regularisation functional for obtaining a first image estimate of the unknown image; and solving the optimisation problem to obtain the first image estimate.

Abstract: The invention concerns an apparatus for estimating a velocity of at least one scatterer in a medium, the apparatus comprising a generator for generating excitation signals, a curved array of virtual transducers (T1-Tn) for transforming said excitation signals into Archimedean spiral waves and for: emitting said Archimedean spiral waves in a plurality of predetermined directions of propagation defined by a set of insonification angles (?i), a curvature of said curved array of virtual transducers defining a reference center (O) and a radius of curvature (rn), and for receiving, from said at least one scatterer, scattered signals generated by scattering of said Archimedean spiral waves emitted from said curved array of virtual transducers, a driving and processing unit (Uc) for estimating the velocity of said at least one scatterer wherein axial and lateral velocity components are estimated using a set of local wavefront orientations (?eq,i) of the Archimedean spiral waves as a function of the initial set

Abstract: The invention relates to a method for managing exchanges of data between: —a probe (1) comprising a memory containing a probe digital certificate including a probe public key, —a terminal (2) comprising a memory containing a terminal digital certificate including a terminal public key, —a remote platform (3) configured to: ?deliver the probe digital certificate to the probe and ?deliver the terminal digital certificate to the terminal, characterised in that the method comprises the implementation of an authentication procedure consisting of the following steps:—a first step in which the probe verifies the identity of the terminal from the terminal digital certificate; —a second step in which the terminal verifies the identity of the probe from the probe digital certificate, and—a third step in which the probe, the terminal and the platform each generate an identical session key from the probe and terminal public keys.

Abstract: The present invention concerns a pulse wave image reconstruction method to be used for example in ultrasound imaging. The proposed method is based on an image measurement model and its adjoint operator. The proposed method introduces matrix-free formulations of the measurement model and its adjoint operator. The proposed method has the advantage that the reconstructed image has a very high quality and that it can be reconstructed quickly.

Abstract: The present invention concerns an array processing image reconstruction method comprising: receiving a set of echo waveforms as measurements from the object of interest; defining a measurement model linking an unknown image of the object to the measurements; defining a data fidelity functional using the measurement model; defining a regularisation functional using a trained non-linear mapping, the regularisation functional comprising prior knowledge about the unknown image; defining an optimisation problem involving the data fidelity functional and the regularisation functional for obtaining a first image estimate of the unknown image; and solving the optimisation problem to obtain the first image estimate.

Abstract: The present invention concerns a pulse wave image reconstruction method to be used for example in ultrasound imaging. The proposed method is based on an image measurement model and its adjoint operator. The proposed method introduces matrix-free formulations of the measurement model and its adjoint operator. The proposed method has the advantage that the reconstructed image has a very high quality and that it can be reconstructed quickly.

Abstract: Disclosed is a method intended to validate that an element is covered with a true skin and implemented by a validation device including a light source at at least one wavelength, a sensor, an analysis module and a decision-taking module. The method may include: placing a surface of the element in front of the light source and the sensor; illuminating, by the light source, the surface of the element; capturing, by the sensor, for each wavelength, an image of the positioned element that encompasses an illuminated zone of the element directly illuminated by the light beam and a peripheral zone (“the diffusion zone of the element,” which is peripheral to the illuminated zone); analyzing the illuminated zone and the diffusion zone of the captured image; and deciding, by the decision-taking module, whether the element is covered with a true skin according to the results of the analysis.

Abstract: Disclosed is a method intended to validate that an element is covered with a true skin and implemented by a validation device including a light source at at least one wavelength, a sensor, an analysis module and a decision-taking module. The method may include: placing a surface of the element in front of the light source and the sensor; illuminating, by the light source, the surface of the element; capturing, by the sensor, for each wavelength, an image of the positioned element that encompasses an illuminated zone of the element directly illuminated by the light beam and a peripheral zone (“the diffusion zone of the element,” which is peripheral to the illuminated zone); analyzing the illuminated zone and the diffusion zone of the captured image; and deciding, by the decision-taking module, whether the element is covered with a true skin according to the results of the analysis.