Cancer Institute A national cancer institute
designated cancer center

Christopher H. Contag

Publication Details

  • Efficient rejection of scattered light enables deep optical sectioning in turbid media with low-numerical-aperture optics in a dual-axis confocal architecture JOURNAL OF BIOMEDICAL OPTICS Liu, J. T., Mandella, M. J., Crawford, J. M., Contag, C. H., Wang, T. D., Kino, G. S. 2008; 13 (3)


    Miniature endoscopic microscopes, with subcellular imaging capabilities, will enable in vivo detection of molecularly-targeted fluorescent probes for early disease detection. To optimize a dual-axis confocal microscope (DACM) design for this purpose, we use a tabletop instrument to determine the ability of this technology to perform optical sectioning deep within tissue. First, we determine how tissue scattering deteriorates the diffraction-limited transverse and vertical responses in reflectance imaging. Specifically, the vertical response of a DACM to a plane reflector is measured at various depths in a scattering phantom and compared with diffraction theory and Monte Carlo scattering simulations. Similarly, transverse line scans across a knife-edge target are performed at various depths in a scattering phantom. Second, as a practical demonstration of deep-tissue fluorescence microscopy that corroborates the findings from our scattering experiments, 3-D fluorescence images are obtained in thick human gastrointestinal mucosal specimens. Our results demonstrate efficient rejection of scattered light in a DACM, which enables deep optical sectioning in tissue with subcellular resolution that can distinguish between normal and premalignant pathologies.

    View details for DOI 10.1117/1.2939428

    View details for Web of Science ID 000257951200048

    View details for PubMedID 18601565

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