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11 March 2015 Label-free optical-resolution photoacoustic endomicroscopy in vivo
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Intravital microscopy techniques have become increasingly important in biomedical research because they can provide unique microscopic views of various biological or disease developmental processes in situ. Here we present an optical-resolution photoacoustic endomicroscopy (OR-PAEM) system that visualizes internal organs with a much finer resolution than conventional acoustic-resolution photoacoustic endoscopy systems. By combining gradient index (GRIN) lens-based optical focusing and ultrasonic ring transducer-based acoustic focusing, we achieved a transverse resolution as fine as ~10 μm at an optical working distance of 6.5 mm. The OR-PAEM system’s high-resolution intravital imaging capability is demonstrated through animal experiments.
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Joon-Mo Yang, Chiye Li, Ruimin Chen, Bin Rao, Junjie Yao, Cheng-Hung Yeh, Amos Danielli, Konstantin Maslov, Qifa Zhou, K. Kirk Shung, and Lihong V. Wang "Label-free optical-resolution photoacoustic endomicroscopy in vivo", Proc. SPIE 9323, Photons Plus Ultrasound: Imaging and Sensing 2015, 932332 (11 March 2015);

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