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Traitement et analyse du signal ultrasonore pour la caractérisation de l'os cortical

Abstract : This work deals with the ultrasonic characterization of cortical bone. In a first part, the signals acquired with a 1-MHz axial transmission device are analyzed. A later contribution occuring after the first arriving signal is studied after the application of a wave separation procedure. This contribution is shown to be of interest for the ultrasonic characterization of cortical bone. Indeed, experiments performed in vitro on human radii show that this contribution is associated with a flexural wave guided which is dependent on the cortical thickness. In addition, this contribution has a lower frequency content than the first arriving signal and is associated with a different propagation mode. Therefore, a more thorough analysis of the ultrasonic signals enables a multi-modal/multi-frequency approach. In a second part, the ultrasonic attenuation is evaluated in an in vitro experimental study on bovine cortical bone samples. Ultrasonic attenuation is shown to be dependent on bone properties and micro-structure. Furthermore, this parameter seems to be more sensitive than the longitudinal wave velocity to bone parameters. Attenuation, in combination with ultrasonic wave velocity, is of interest and may provide a more comprehensive characterization of cortical bone
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https://tel.archives-ouvertes.fr/tel-00345631
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Submitted on : Friday, March 5, 2010 - 1:36:37 PM
Last modification on : Thursday, March 19, 2020 - 11:52:03 AM
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Magali Sasso. Traitement et analyse du signal ultrasonore pour la caractérisation de l'os cortical. Autre. Université Paris-Est, 2008. Français. ⟨NNT : 2008PEST0009⟩. ⟨tel-00345631v2⟩

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