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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Fourier domain multispectral multiple scattering low coherence interferometry.

Thomas E Matthews, Michael G Giacomelli, William J Brown

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    This summary is machine-generated.

    We developed multispectral multiple scattering low coherence interferometry (ms2/LCI) to image deep within scattering samples. This new Fourier domain system enhances speed and spectroscopic detail for better feature localization.

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    Area of Science:

    • Biophotonics
    • Optical Imaging
    • Spectroscopy

    Background:

    • Traditional spectroscopic optical coherence tomography faces limitations in imaging depth and speed.
    • Multiple scattering events contain valuable information about sample properties.
    • Previous implementations of ms2/LCI used time-domain data collection, limiting acquisition speed.

    Purpose of the Study:

    • To implement and characterize a Fourier domain multispectral multiple scattering low coherence interferometry (ms2/LCI) system.
    • To improve imaging speed and spectroscopic information retrieval for deep tissue analysis.
    • To localize features with spectroscopic contrast in scattering samples up to 1 cm deep.

    Main Methods:

    • Utilized Fourier domain data collection for enhanced acquisition speed and spectroscopic analysis.
    • Employed separate delivery and detection angular apertures to minimize diffuse background.
    • Used a supercontinuum light source and digital lock-in detection for spectral noise mitigation.
    • Tested the system using a tissue-like scattering phantom to acquire visible range chromophore absorption spectra.

    Main Results:

    • Achieved millimeter resolution imaging up to 1 cm deep in scattering samples.
    • Demonstrated increased data acquisition speed and richer spectroscopic information compared to time-domain methods.
    • Successfully isolated localized spectral features from deeper within the sample.
    • Mitigated noise from the supercontinuum source using intensity modulation and lock-in detection.

    Conclusions:

    • The developed Fourier domain ms2/LCI system offers significant advantages for deep tissue spectroscopic imaging.
    • The system enables localization of features with spectroscopic contrast at depths previously unattainable.
    • This technology holds promise for advanced biomedical diagnostics and research.