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A research system of underwater acoustic waves based on interferometry is proposed for the study of laser-induced underwater acoustic waves. Neodymium:Yttrium Aluminum Garnet (ND:YAG) laser is adapted to interact with the water surface to produce acoustic waves in this system. The beam emitted from the He-Ne laser is divided into two parts: reference beam and probe beam, and the probe beam goes through...
Optoacoustic imaging is a new promising medical imaging modality combining the benefits of optical and acoustical methods. The strong scattering behaviour of biological media limits the imaging depth of pure optical modalities like OCT (optical coherence tomography). On the other hand, the field of applications of ultrasound is sometimes limited by the lack of contrast in acoustical impedance between...
Photoacoustics (PA) combines the high contrast of optical imaging modalities with the high resolution of clinical ultrasound. Fluorescence mediated tomography (FMT), on the other hand, offers a very high molecular contrast specificity. Therefore, a combination of PA imaging and FMT might be fruitful: e.g. PA imaging could provide valuable a priori information for optical-tomography reconstruction...
Time-reversal of ultrasonic waves allows focusing ultrasound through complex media, such as highly aberrating or highly diffusive media. Time-reversal is based on the detection and re-emission of waves generated by ultrasound sources located within the investigated medium. Classically, these sources consist of high acoustic contrasts echoing ultrasonic waves generated by an incident ultrasonic field,...
Photoacoustics (PA) combines the high contrast of optical imaging modalities with the high resolution of clinical ultrasound. Photoacoustic contrast agents improve the maximum imaging depth of photoacoustic imaging and may render it possible to use this modality for molecular imaging. Organic dyes, like indocyanine green, or inorganic nanoparticles are used as photoacoustic contrast agents. However,...
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