A method and a device for imaging a visco-elastic medium

A - Human Necessities – 61 – B

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A61B 8/08 (2006.01)

Patent

CA 2647283

The invention relates to a method and a device for imaging a visco-elastic medium (2). 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 (2) 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 Theological properties of the visco-elastic medium (2) at at least one point [Bij] of the imaging zone situated at a given depth outside the excitation zone [A]. The quantitative index [Cij] is representative of a comparison between signals acquired during the movements generated in response to the mechanical stress at at least one point [Aij] of the excitation zone [A] situated at the given depth, and signals acquired during the movements generated in response to the mechanical stress at at least the point [Bij] of the imaging zone [B] situated outside the excitation zone [A].

L'invention concerne un procédé et un dispositif permettant d'imager un milieu viscoélastique (2). Le procédé comprend une phase d'excitation durant laquelle une contrainte mécanique interne est générée dans une zone d'excitation [A] et une phase d'imagerie consistant à acquérir des signaux pendant les mouvements générés par la contrainte mécanique dans le milieu viscoélastique (2) en réaction à la contrainte mécanique interne dans une zone d'imagerie [B] comprenant la zone d'excitation [A]. Selon l'invention, le procédé comprend en outre une phase consistant à calculer un indice quantitatif [Cij] associé aux propriétés rhéologiques du milieu viscoélastique (2) au moins au niveau d'un point [Bij] de la zone d'imagerie située à une profondeur donnée à l'extérieur de la zone d'excitation [A]. L'indice quantitatif [Cij] est représentatif d'une comparaison entre des signaux acquis pendant les mouvements générés en réaction à la contrainte mécanique au moins au niveau d'un point [Aij] de la zone d'excitation [A] située à la profondeur donnée, et des signaux acquis pendant les mouvements générés en réaction à la contrainte mécanique au moins au niveau d'un point [Bij] de la zone d'imagerie [B] située à l'extérieur de la zone d'excitation [A].

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