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    We developed a low-cost endoscopic imaging system using back electromotive force (BEMF) to reduce image jitter and distortion. This sensorless approach enables real-time visualization for improved medical screening and surgical guidance.

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    Area of Science:

    • Biomedical Engineering
    • Optical Imaging
    • Endoscopy

    Background:

    • Circumferential scanning in endoscopic imaging is vital for medical applications.
    • Optical Coherence Tomography (OCT) offers high-speed, high-resolution imaging.
    • Image jitter and non-uniform rotational distortion (NURD) impede real-time visualization in high-speed OCT endoscopy.

    Purpose of the Study:

    • To develop an innovative, low-cost endoscopic solution for real-time OCT imaging.
    • To overcome limitations of image jitter and NURD in high-speed OCT endoscopy.
    • To enable accurate synchronization of OCT acquisition with endoscopic scanning.

    Main Methods:

    • Utilized a brushless DC motor for endoscopic scanning.
    • Implemented a sensorless triggering technique using back electromotive force (BEMF) for synchronization.
    • Integrated BEMF-triggered OCT with a Fourier Domain Mode-Locked (FDML) Megahertz OCT system.

    Main Results:

    • Achieved a significant reduction in image jitter and NURD (<4 mrad).
    • Enabled real-time visualization capabilities during high-speed OCT endoscopy.
    • Demonstrated a cost-effective and deployable solution for endoscopic imaging.

    Conclusions:

    • The BEMF-triggered OCT system effectively minimizes image artifacts in endoscopic procedures.
    • This sensorless approach enhances real-time visualization for medical screening and surgical guidance.
    • The technology offers a promising, accurate, and affordable advancement in endoscopic OCT imaging.