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    Magnetomotive optical coherence tomography (MMOCT) uses magnetic nanoparticle (MNP) motion for imaging. A new device reduces noise, increasing MMOCT sensitivity by 20 times for better MNP tracking in zebrafish.

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    Area of Science:

    • Biomedical Imaging
    • Nanotechnology
    • Optical Physics

    Background:

    • Magnetomotive optical coherence tomography (MMOCT) enables noninvasive 3D tracking of magnetic nanoparticle (MNP) motion.
    • External magnetic fields (B-field) provide MMOCT contrast but introduce modulation noise, degrading image quality.

    Purpose of the Study:

    • To design a common-path-based device for reducing modulation noise in MMOCT.
    • To enhance the sensitivity and imaging quality of MMOCT systems.

    Main Methods:

    • Developed a common-path-based device with adjustable interference distance, reference light intensity, and X-Y translation.
    • Implemented the device to reduce B-field modulation noise in MMOCT.

    Main Results:

    • The new device achieved approximately 20 times higher MMOCT sensitivity.
    • Successfully imaged the distribution of MNPs injected into zebrafish using the enhanced MMOCT system.

    Conclusions:

    • The developed common-path device effectively reduces modulation noise in MMOCT.
    • This advancement significantly improves MMOCT sensitivity and enables clearer imaging of MNP distribution in biological samples.