This study addresses the challenges of adding functionality and hybridizing processes in additive manufacturing. It focuses on embedding a gold-coated optical fiber into an INOX structure, aiming to extend this process to optical sensors like fiber Bragg grating arrays. The primary concern is the sensor's resistance to high temperatures during metal deposition, while the second challenge involves the adhesion of filler material to the sensor and structure. The feasibility is assessed through a finite element thermal model and mechanical testing, confirming the process's viability. Successful light transmission through the fiber and tensile tests indicate structural integrity and reduced ductility, warranting further investigation under varying load conditions.
Throughout the history of medicine, assessing stiffness through palpation has served as an indicator to gauge tissue health. Within our research team, we are advancing an innovative approach for full-field optical elastography, rooted in noise correlation analysis. This method leverages the relationship between the correlation function of a diffuse shear wave field and the time reversal of the shear wave field. By examining the correlation function, we then have access to an estimation of the shear wave speed, directly linked to tissue stiffness. Recent findings using this approach have shown great promise. However, in most cases, only the elasticity is quantified, despite the availability of additional information, such as viscosity, also present in the correlation function. In this paper, we introduce our initial outcomes in integrating noise correlation with artificial intelligence. More specifically, we employ a U-NET-based architecture to process noise correlation data.
Over the past few decades, a multitude of optical imaging techniques have emerged. Among them, full-field optical coherence tomography (FF-OCT) has gained significant importance in various biomedical applications. Indeed, FF-OCT stands out as a noninvasive and label-free imaging method capable of generating high-resolution 3D microscopic images of light-scattering biological specimens. However, FF-OCT approach is limited for in-vivo imaging and images from FF-OCT lack the specificity required for accurate diagnosis. Hence, there is a need to have access to in-vivo imaging and to incorporate additional contrast modalities, such as elastography, into the FF-OCT technique. Indeed, the combination of FF-OCT with shear wave elastography enables the quantitative assessment of tissue stiffness at a resolution of a few micrometers. In this context, we present a novel FF-OCT approach that enables single-shot acquisitions, making it well-suited for both in-vivo imaging and transient shear wave elastography.
The last few decades have seen the emergence of a huge number of optical imaging techniques. Among them, full-field optical coherence tomography (FF-OCT) has become valuable for many biomedical applications. Indeed, FF-OCT is a noninvasive and label-free imaging technique that produces high-resolution 3D microscopic images of scattering biological samples. However, FF-OCT images alone lack of specificity for accurate diagnosis. That is why it is necessary to add new contrast modalities to FF-OCT technique such as elastography. Indeed, coupling FF-OCT with shear wave elastography allows quantitative estimation of the stiffness at a resolution of a few micrometers. We present here our first results on coupling single-shot off-axis FF-OCT (SO-FF-OCT) method with transient shear wave elastography method.
The last few decades have seen the emergence of a huge number of optical imaging techniques. Among them, full-field optical coherence tomography (FF-OCT) has become valuable for many biomedical applications. Indeed, FF-OCT is a noninvasive and label-free imaging technique that produces high-resolution 3D microscopic images of scattering biological samples. Using FF-OCT approach for in-vivo imaging would enable the observation of cell-scale structures in living samples. Moreover, living samples have an active vascularization that can therefore be observed using Doppler imaging. We propose in this study a new FF-OCT approach that enables single-shot acquisitions which is suitable for in-vivo and Doppler imaging.
Full-field optical coherence tomography (FF-OCT) enables high-resolution 3D imaging. FF-OCT is a noninvasive and label-free imaging technique that produces high-resolution microscopy images of scattering biological samples. During the last decade, FF-OCT has become invaluable for many biomedical applications. It requires the extraction of the amplitude and phase components from the interference signal, for which a phase-shifting algorithm is usually used. However, this algorithm is not well adapted for real-time observation of in-vivo samples, therefore limiting the use of FF-OCT for ¬in-vivo imaging and clinical transfer. We propose in this study a new approach in FF-OCT that enables single-shot acquisitions using off-axis digital holography principle with low spatially and temporally coherent source.
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