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Advanced signal and imaging methods in ultrasound cortical bone assessment

Abstract : Ultrasound technology provides an affordable means to implement non-invasive solutions to diagnostically assess the mechanical characteristics of the bone. In this thesis we introduce Orthogonal Matching Pursuit (OMP) to obtain a robust reconstruction of the waveform of each echo bouncing off the cortical bone surfaces. Echoes' time-of-flight and central frequencies are used to calculate Ct.Th and normalized broadband attenuation (nBUA). In vivo measurements have been successfully performed with pulse-echo ultrasound and reference data wase obtained with HR-pQCT (cortical thickness, vBMD). Ct.Th and nBUA were highly correlated to reference thickness values (r2=0.90) and vBMD (r2=0,90), respectively. The second main contribution is that we introduce Time Domain Topological Energy (TDTE) method and migration into cortical bone imaging. TDTE shows well performance in extracting the structure of cortical bone, including the external, internal boundary of cortical bone and porous structure inside the cortical bone. Migration can provide a rough quantitative distribution of density, compression wave speed, and shear wave speed.
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https://tel.archives-ouvertes.fr/tel-03141324
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Submitted on : Monday, February 15, 2021 - 11:13:31 AM
Last modification on : Saturday, February 20, 2021 - 1:38:40 PM

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  • HAL Id : tel-03141324, version 1

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Chao Han. Advanced signal and imaging methods in ultrasound cortical bone assessment. Signal and Image Processing. Sorbonne Université, 2019. English. ⟨NNT : 2019SORUS144⟩. ⟨tel-03141324⟩

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