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Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT
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    This study introduces a new method to reduce speckle noise in optical coherence tomography (OCT) images by altering the sample beam. This technique enhances image clarity for better biomedical imaging and diagnosis.

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    Area of Science:

    • Biomedical Imaging
    • Optical Engineering

    Background:

    • Speckle noise in Optical Coherence Tomography (OCT) degrades image quality.
    • This degradation negatively impacts diagnostic accuracy in clinical applications.

    Purpose of the Study:

    • To propose a novel technique for speckle noise suppression in OCT.
    • To improve OCT image quality without compromising resolution.

    Main Methods:

    • Utilized a special optical chopper to modify the spatial distribution of the sample beam.
    • Captured and compounded a series of OCT images with uncorrelated speckle patterns.

    Main Results:

    • Achieved a signal-to-noise ratio improvement of approximately 6.4 dB in tissue phantom imaging.
    • Demonstrated clearer visualization of fine biological structures (sweat glands, blood vessels) in human skin in vivo compared to conventional OCT.

    Conclusions:

    • The proposed speckle noise suppression technique effectively enhances OCT image quality.
    • The method offers advantages of low cost, simple structure, and compact integration for future biomedical imaging devices.