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Theses

Élastographie par retournement temporel : mesure des propriétés mécaniques des tissus biologiques par réseau de sources d’onde de cisaillement

Abstract : This thesis is in line with shear-wave elastography research. After, a bibliographic review, an experimental study shows that the resolution on ultrasound elastography is of the same order of magnitude of the echography resolution and its limit exceeds the shear-wavelength. The original aspect of this work is the use of a phased array of mechanical sources to generate and control shear waves. A time reversal mirror of six shakers is set up. This device shows a space-time control of shear-wave field in gelatin-graphite phantom. Compared to the use of a single source, this phased array of shear-wave improves by 10dB the signal to noise ratio. Using this method on human skull model shows the possibility to deliver and control shear waves in brain using bone conduction. Finally, the application of this method on shear-wave elastography of abdominal layers is shown by a study on synthetic model and in vivo on a healthy volunteer
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https://tel.archives-ouvertes.fr/tel-02004434
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Submitted on : Friday, February 1, 2019 - 5:35:29 PM
Last modification on : Wednesday, November 20, 2019 - 2:54:37 AM
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  • HAL Id : tel-02004434, version 1

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Chadi Zemzemi. Élastographie par retournement temporel : mesure des propriétés mécaniques des tissus biologiques par réseau de sources d’onde de cisaillement. Imagerie médicale. Université de Lyon, 2018. Français. ⟨NNT : 2018LYSE1217⟩. ⟨tel-02004434⟩

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