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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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Updated: May 12, 2026

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
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Multi-channel delay sampling to extend imaging depth in high-speed swept-source OCT systems.

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    |May 1, 2024
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    We developed a new multi-channel delay sampling method to significantly extend imaging depth in high-speed swept-source optical coherence tomography (SS-OCT). This technique enhances ranging distance and improves signal quality without compromising performance.

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    Area of Science:

    • Biomedical Optics
    • Optical Imaging
    • Signal Processing

    Background:

    • High-speed swept-source optical coherence tomography (SS-OCT) is crucial for various imaging applications.
    • Extending the imaging depth of SS-OCT is a persistent challenge.
    • Current methods often involve trade-offs in speed or performance.

    Purpose of the Study:

    • To introduce a novel multi-channel delay sampling method for SS-OCT.
    • To enhance the imaging depth and signal-to-noise ratio (SNR) of SS-OCT systems.
    • To achieve extended ranging distance without sacrificing imaging performance.

    Main Methods:

    • A multi-channel delay sampling technique was implemented using N channels with fixed time delays.
    • Interference signals were captured, digitized, and calibrated to compensate for phase shifts.
    • Signals were merged in k-space and resampled to linearize the spectrum.

    Main Results:

    • The sampling rate was increased by a factor of N, extending the ranging distance by N times.
    • Signal-to-noise ratio and sensitivity were enhanced within the original depth range.
    • The method successfully extended imaging depth without altering k-clock triggering or other performance metrics.

    Conclusions:

    • The multi-channel delay sampling method effectively extends imaging depth in SS-OCT.
    • This technique offers improved SNR and sensitivity, enhancing overall system performance.
    • This advancement provides a valuable tool for deeper, higher-quality OCT imaging.