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 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 comprising: a housing (31), a transducer array (33) for emitting high-frequency ultrasonic waves and receiving acoustic echoes, characterized in that the probe (3) further comprises at least one inertial vibration exciter (34) including: a fixed part (341) mechanically integral with the transducer array (33), a mobile part (342) capable of moving relative to the fixed part to produce vibrations in order to generate the low-frequency elastic wave.

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.