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Imaging Biological Samples with Optical Microscopy01:18

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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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Phase-Contrast Microscopes
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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Related Experiment Video

Updated: May 6, 2026

Simultaneous Brightfield, Fluorescence, and Optical Coherence Tomographic Imaging of Contracting Cardiac Trabeculae Ex Vivo
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Multiplexing-based polarization sensitive en-face optical coherence tomography.

Mantas Zurauskas, Adrian Gh Podoleanu

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    We developed a novel polarization-sensitive optical coherence tomography system for advanced tissue imaging. This system enables simultaneous multi-channel imaging, revealing details in thermally damaged muscle tissue.

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    Area of Science:

    • Biomedical Optics
    • Medical Imaging
    • Tissue Optics

    Background:

    • Polarization-sensitive optical coherence tomography (PS-OCT) provides valuable information about tissue birefringence.
    • Traditional PS-OCT systems often face limitations in simultaneous multi-channel acquisition and signal division.
    • Efficient imaging of tissue microstructure and damage requires advanced OCT techniques.

    Purpose of the Study:

    • To introduce a novel time-domain PS-OCT system with multichannel acousto-optic deflectors.
    • To demonstrate simultaneous acquisition of multiple PS-OCT channels without signal division.
    • To showcase the system's capability for imaging thermally damaged muscle tissue.

    Main Methods:

    • A time-domain PS-OCT system operating at 830 nm was configured.
    • Multichannel acousto-optic deflectors and single photodetectors were employed.
    • The system simultaneously acquired interference and backscattered intensity for PS and polarization-insensitive imaging.

    Main Results:

    • The system successfully acquired simultaneous interference information from multiple PS channels.
    • Both PS and polarization-insensitive images of the sample were generated.
    • The capability for multi-channel imaging without dividing the object signal was achieved.

    Conclusions:

    • The developed time-domain PS-OCT system offers efficient multi-channel imaging capabilities.
    • This technology enables simultaneous acquisition of diverse polarization information from tissues.
    • The system is effective for visualizing microstructural changes, as demonstrated in thermally damaged muscle tissue.