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Related Concept Videos

Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

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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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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Related Experiment Video

Updated: Jul 15, 2026

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)
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Polarization-Sensitive Module for Optical Coherence Tomography Instruments.

Po-Yi Lee, Chuan-Bor Chueh, Milen Shishkov

    IEEE Transactions on Medical Imaging
    |July 13, 2026
    PubMed
    Summary

    This study introduces a modular polarization-sensitive optical coherence tomography (PS-OCT) system compatible with standard OCT platforms. The new framework enables accurate measurement of tissue birefringence, potentially increasing PS-OCT

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    Area of Science:

    • Biomedical Optics
    • Ophthalmic Imaging
    • Medical Physics

    Background:

    • Polarization-sensitive optical coherence tomography (PS-OCT) quantifies tissue birefringence by analyzing backscattered light polarization.
    • Conventional PS-OCT systems require specialized polarization-diverse detection, limiting their integration with commercial optical coherence tomography (OCT) systems.
    • This incompatibility restricts the broader scientific and clinical application of PS-OCT technology.

    Purpose of the Study:

    • To develop a modular PS-OCT framework adaptable to standard spectral-domain OCT platforms.
    • To enable reconstruction of the sample's round-trip Jones matrix and polarization properties.
    • To facilitate wider adoption of PS-OCT for research and clinical applications by reducing hardware complexity.

    Main Methods:

    • Integration of a detachable rotating achromatic half-wave plate into the sample arm of a commercial OCT system.
    • Acquisition of three or more measurements at distinct waveplate orientations to capture polarization modulation.
    • Implementation of a phase optimization strategy to mitigate phase variations between repeated measurements for accurate Jones matrix reconstruction.

    Main Results:

    • Successful reconstruction of the round-trip Jones matrix and corresponding polarization properties from modulated polarization states.
    • Demonstrated reliable in vivo imaging of human retina birefringence, including retardance and optic axis orientation.
    • Validated the framework using birefringent phantoms, confirming its accuracy and robustness.

    Conclusions:

    • The developed modular PS-OCT framework offers a practical solution for integrating polarization sensitivity into standard OCT systems.
    • This approach simplifies hardware requirements, potentially overcoming barriers to PS-OCT adoption.
    • The framework shows promise for advancing ophthalmic imaging and other research areas requiring birefringence measurement.