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Communication Dans Un Congrès Année : 2022

Quantitative anatomical imaging by ultrasound diffraction tomography

Imagerie anatomique quantitative par tomographie ultrasonore en diffraction

Résumé

Ultrasound Computed Tomography using linear inversion methods fail to provide high resolution bone images. For children thin bone imaging, acquisition steps must be as fast as possible with a short-time exposure and low-intensity sonication. We have developed a fast-acquisition setup based on a cylindrical-focusing ring antenna, and a fast-protocol using Born approximation and spatial Fourier transform. But the result is still poor contrast-to-noise ratio (CNR) image. This work is concerning the improvement of CNR using a wavelet-based adapted method. Results will be presented and discussed on newborn arm phantoms and ex vivo complete organ. Description of purpose Current medical B-mode ultrasound does not allow imaging under subperiosteal cortical areas of bone. No information is available on cortical depth, underlying medullary tissue or marrow. Many authors have discussed ultrasonic imaging of bones. Their main objective was to evaluate the thickness of the diaphysis in axial and transverse mode, and/or was to estimate the velocity of the sound of a wave passing through the structure. Our group has been focusing on the cross-sectional radial imaging process using diffractionmode Ultrasonic Computed Tomography (USCT). Although this method is known to provide a potentially valuable means of imaging objects with similar acoustical impedance, in the case of bone imaging, difficulties are bound with the higher acoustical impedance difference, which strongly alters the propagation of the ultrasonic waves, and generally induces low Contrast-to-Noise Ratio (CNR). It is necessary to change the methods used for the processing of the ultrasonic signals. Our group developed a wavelet-based codedexcitation (WCE) method enabling to process all the information available in frequency and time. The aim of this study is to investigate the feasibility of the WCE method as a mean of Contrast-to-Noise Ratio enhancement of diffraction-mode USCT. In this work, the WCE method is combined with inverse filtering that improves the image quality. Experimental results on newborn arm phantom and on an ex vivo chicken drumstick, are presented and the usefulness of the WCE method discussed.
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Dates et versions

hal-03619894 , version 1 (28-03-2022)

Identifiants

  • HAL Id : hal-03619894 , version 1

Citer

Élise Doveri, Jeanne Baldisser, Laurent Sabatier, Vincent Long, Luis Espinosa, et al.. Quantitative anatomical imaging by ultrasound diffraction tomography. 16e Congrès Français d'Acoustique 2022, Apr 2022, Marseille, France. ⟨hal-03619894⟩
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