A5079346050- Ultrasonics and Acoustic Wave Propagation
- Ultrasound Imaging and Elastography
- Geophysical Methods and Applications
- Microwave Imaging and Scattering Analysis
- Bone health and osteoporosis research
- Electrical and Bioimpedance Tomography
- Medical Imaging Techniques and Applications
- Seismic Imaging and Inversion Techniques
- Flow Measurement and Analysis
- Photoacoustic and Ultrasonic Imaging
- Wood Treatment and Properties
- Tree Root and Stability Studies
- Ultrasound and Hyperthermia Applications
- Bone fractures and treatments
- Numerical methods in inverse problems
- Seismic Waves and Analysis
- Advanced X-ray and CT Imaging
- Hip disorders and treatments
- Non-Destructive Testing Techniques
- Elasticity and Material Modeling
- Image and Signal Denoising Methods
- AI in cancer detection
- Ultrasound and Cavitation Phenomena
- Drilling and Well Engineering
- Remote Sensing and LiDAR Applications
Centre National de la Recherche Scientifique
2014-2024
Laboratoire de Mécanique et d’Acoustique
2015-2024
Centrale Marseille
2013-2024
Aix-Marseille Université
2013-2023
We introduce an ultrasonic quantitative imaging method for long bones based on full-waveform inversion. The cost function is defined as the difference in L 2-norm sense between observed data and synthetic results at a given iteration of iterative inversion process. For simplicity, order to reduce computational cost, we use two-dimensional acoustic approximation. inverse problem solved iteratively quasi-Newton technique called Limited-memory Broyden-Fletcher-Goldfarb-Shanno method. show how...
Ultrasound tomography has considerable potential as a means of breast cancer detection because it reduces the operator-dependency observed in echography. A half-ring transducer array was designed based on anatomy, to obtain reflectivity images ductolobular structures using tomographic reconstruction procedures. The 3-MHz comprises 1024 elements set 190-degree circular arc with radius 100 mm. front-end electronics incorporate 32 independent parallel transmit/receive channels and 32-to-1024...
Wood is a biological growth medium. It orthotropic with longitudinal, radial and tangential axes. Furthermore, standing trees adapt themselves to environmental conditions, their material properties vary age. These changes result in variations that are much more complex than anisotropy. Studying wood quality intraspecific variability useful for clonal selection the genetic improvement of plantations. In this study, two logs Picea abies underwent transmission tomography. The mean diameter was...
The objective of this study is to make cross-sectional ultrasonic quantitative tomography the diaphysis long bones. Ultrasonic propagation in bones affected by severe mismatch between acoustic properties biological solid and those surrounding soft medium, namely, tissues vivo or water vitro. Bone imaging then a nonlinear inverse-scattering problem. In paper, we showed that vitro images sound velocities human femur cross section could be reconstructed combining reflection (URT), which...
This study deals with the reconstruction, from ultrasonic measured data, of sound speed profile a penetrable two-dimensional target arbitrary cross-section embedded in an infinite medium. Green's theorem is used to obtain domain integral representation acoustical scattered field, and discrete formulation inverse problem obtained using moment method. An iterative non-linear algorithm minimizing discrepancy between computed fields reconstruct region interest. The minimization process performed...
Computed ultrasonic bone tomography (USCT) is a non-invasive and non-ionizing technique, which ensures the protection of child being against x-rays.The main objective this article to use an image processing algorithm improve signal-to-noise ratio computed children bones for automatic detection osteopathologies.For fact, we construct application with Microsoft Foundation Class Library (FMC) integrated in visual Studio using Haar wavelet detect edges.Different methods are used.Hence, make...
Quantitative ultrasound techniques have been previously used to evaluate biological hard tissues, characterized by a large acoustic impedance contrast. Here, we are interested in the imaging of experimental data from different test-targets with high contrast, using Full Waveform Inversion (FWI) method solve inverse problem. This is based on high-resolution numerical modeling forward problem interaction between waves and medium, considering full time series. To reduce complexity...
This paper deals with the inverse scattering problem observed when ultrasonic waves are used to analyze biological media. The objective is image cancellous and cortical bone by reflected tomography (URT). Because strong contrast high absorbance bodies such as bones cannot be imaged at usual frequencies (> 1 MHz), we adapted for low-frequency URT (< MHz) our tomographic set-up reconstruction acquisition tools, previously developed weakly scattered Indeed, frequency of transducer decreases,...