Commissariat a L'energie Atomique Et Aux Energies Alternatives

Djallel Belhadj

Sylvain Chatillon

A method for characterizing a tubular object by ultrasonic imaging includes: acquiring a plurality of ultrasonic signals originating from the reflection of an ultrasonic field transmitted by the transducer in a region of interest in a transverse cross-sectional plane of the object, for different positions of the transducer relative to the region, all of the ultrasonic signals forming an ultrasonic image of the region; for each signal corresponding to a vector of the image, applying a predetermined first filter to the signal; selecting, from all of the signals, the signal for which the result of the filter contains the extremum with the highest absolute value, and plotting the abscissa of this extremum; and determining the centre of the object from the abscissa plotted and the velocity of the ultrasonic signal.

Method for characterizing a tubular object such as a blood vessel by ultrasonic imaging

A method for characterising an object using an ultrasound probe, the method including the following steps of: carrying out several iterations of the following steps of: i. transmitting an ultrasound field having an aperture with a given size; ii. measuring an echo of the ultrasound field following reflection on a zone of interest of an object to be imaged; iii. modifying, for each new iteration, the size of the aperture of the ultrasound field; recording, for at least one point of interest in the zone of interest, the associated time-of-flight on the measurement of the echo; determining, based on the time-of-flight measurements, a variation model of the times-of-flight as a function of the size of the aperture of the ultrasound field; extrapolating the time-of-flight of the point of interest for an aperture size tending towards 0 based on said model.

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GIF-SUR-YVETTE, France

Djallel Belhadj