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Academic literature on the topic 'Imagerie acousto-optique'
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Dissertations / Theses on the topic "Imagerie acousto-optique"
Lesaffre, Max. "Imagerie acousto-optique de milieux diffusants épais par détection photoréfractive." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2009. http://pastel.archives-ouvertes.fr/pastel-00556664.
Full textDupuy, Clément. "Reconstruction d'image pour l'acousto-optique vers une imagerie quantitative." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLET034.
Full textThe optical properties of biological tissues are of significant clinical interest. Such media are highly scattering to the near-infrared light which offers the required contrast, and consequently purely optical approaches to imaging tissues at depth suffer from limited spatial resolution. Acousto-optic imaging is a multi-modal technique which overcomes this problem by combining the optical contrast of near infra-red light with the spatial resolution of ultrasound, permitting millimetre resolution at depths of several centimetres. Raw measurements made using the acousto-optic technique are corrupted by the varying optical fluence in the medium. By using inverse problem base reconstructions algorithms, it is possible to reconstruct a map of the absorption coefficient inside the medium. My PhD is conducted between Institut Langevin, in Paris, where my acousto- optics imaging setup is and the Medical Physics and Bioengineering lab in UCL, in London where I work on the reconstruction algorithms in order to achieve quantitative measurement
Atlan, Michaël. "Imagerie optique cohérente de milieux diffusants." Paris 6, 2005. https://pastel.archives-ouvertes.fr/tel-00145711.
Full textVenet, Caroline. "Développement d’un filtre spectral ultra résolu pour l’imagerie acousto-optique." Thesis, Paris Sciences et Lettres (ComUE), 2019. https://pastel.archives-ouvertes.fr/tel-02929318.
Full textOptical imaging for Medicine is limited by the spatial resolution loss due to light scattering in turbid media. A hybrid imaging method called ultrasound optical tomography can overcome this botteneck. Indeed the simultaneous use of light and ultrasound gives access to optical contrast in depth within scattering medium with the ultrasounds resolution. Several interferometric methods have been developed in order to detect an acousto-optic signal. However, none of them is adapted to in vivo imaging. For this reason a filter created with spectral hole burning is of special interest. This thesis presents the development of an ultra-narrow filter based on spectral hole burning in a thulium doped yttrium aluminum garnet crystal (Tm:YAG) under magnetic field. The first part of the manuscript describes the characterization of the filter in the imaging setup. Next, the actual imaging of a scattering gel is described. The following part presents the change of the main laser and its frequency stabilization for technological maturation. The last part of the manuscript details how the experiment have been compacted to be bring in a pharmacetical laboratory in order to launch in vivo imaging trials
Glastre, Wilfried. "Imagerie plénoptique à travers des milieux complexes par synthèse d'ouverture optique." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00951558.
Full textAudier, Xavier. "Spectroscopie Raman stimulée rapide et imagerie spectrale." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0580/document.
Full textCombining microscopy and spectroscopy, one can achieve spectrally resolved imaging, and provide a solution to various chemical, biological, or medical challenges. Coherent Raman scattering (CRS) has proven extremely valuable in providing chemical information, with a higher resolution and shorter acquisition time than spontaneous Raman scattering. The acquisition rate of the spectral information from a sample remains the limiting factor of CRS imaging, and several experimental schemes are being investigated to push the technology toward higher imaging frame rates. This work develops one such scheme. Combining stimulated Raman scattering (a CRS technique), spectral focusing with chirped pulses, and a fast acousto-optic delay line, we achieved unprecedented spectral acquisition rates. The theoretical, technological, and engineering frameworks enabling such acquisition are described in details. The application to pharmaceutical quality control, time resolved chemical transformations, biology, and histology are demonstrated
Farahi, Salma. "Méthodes holographiques et spectroscopiques appliquées à l'imagerie acousto-optique de milieux diffusants épais." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2011. http://tel.archives-ouvertes.fr/tel-00656624.
Full textBenoit, à. la Guillaume Emilie. "Imagerie acousto-optique dans les milieux diffusants épais : de l’amélioration technique à l’application pré-clinique ex vivo." Paris 6, 2013. http://www.theses.fr/2013PA066521.
Full textSpatially resolved optical imaging of biological tissues' depth is hampered by multiple scattering of light. Combining ultrasound localization with detection of scattered light, acousto-optic imaging provides a millimetric resolution by dealing with the "tagged" photons that are spectrally shifted of the ultrasound frequency and come from the acoustic focus confined area. Although the signal is weak and difficult to separate from simply scattered light, several techniques for coherent or incoherent detection exist and are able to produce high-quality images of the optical contrast through several inches thick scattering media. Acousto-optic imaging has already been tested for almost 20 years on calibrated samples mimicking the optical properties of tissues. However, it remains practically unknown in the medical community because examples of applications on actual diseases are missing. This thesis presents the latest enhancements in terms of resolution and speed to both coherent detection techniques we use which consist in digital and photorefractive holography. Moreover, we demonstrate the possibility to perform photorefractive holography without any optical reference beam on a BSO crystal at 532 nm. The implementation of a multi-modal imaging system which combines the acousto-optic technique with a commercial ultrasound imaging device highlights the complementarity of both information through ex vivo experiments carried out on mice tumors or human liver biopsies containing metastasis. Finally, tests performed on chicken breast samples show the ability of acousto-optic imaging to monitor the creation of thermal lesions caused by high intensity focused ultrasound
Benoit, À. La Guillaume Emilie. "Imagerie acousto-optique dans les milieux diffusants épais : de l'amélioration technique à l'application pré-clinique ex vivo." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://pastel.archives-ouvertes.fr/pastel-00916570.
Full textBarjean, Kinia. "Mise en oeuvre de circuits intégrés dédiés à l'analyse des corrélations temporelles des tavelures optiques." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCD050/document.
Full textImplementation of Application Specific Integrated Circuits dedicated to the analysis of speckle patterns temporal correlationsThe fact that near infrared light has a good penetration depth inside biological tissues calls to its exploitation for medical diagnosis purposes. However, given their scattering nature, tissues strongly blur the spatial information. One therefore needs to measure several parameters in order to obtain pertinent information. One can for instance use time-resolved detection, or measure speckle correlations. The latter implies serious technological bottlenecks due to the weakness of the light flux in one speckle grain, and due to the very short correlation times observed in tissues. The biomedical optics group of Laboratoire de Physique de Lasers, in collaboration with Institut d'Electronique Fondamentale, has developed a concept of multipixels ASIC dedicated to speckle detection and analysis. This device processes different speckle grains in parallel, and computes an averaged value across all the pixels in real time in order to improve the signal to noise ratio. Each detection pixel can perform a lock-in detection of the signal, and compute different time correlations. The objective of this thesis is to characterize a new generation of circuits, and to implement them in different experiments on diffuse light propagation. One highlight of this work is the fact that we could compute speckle time correlation as a function of the transit time through 4 cm of milk, despite the very fast decorrelation obtained with such a medium. In addition, we performed acousto-optic imaging experiments with our partners from Institut Langevin, developing for that purpose a new protocol appropriate to our technology