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Related Concept Videos

Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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Super-resolution Fluorescence Microscopy

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Related Experiment Video

Updated: May 31, 2026

Live Cell Imaging of F-actin Dynamics via Fluorescent Speckle Microscopy (FSM)
19:16

Live Cell Imaging of F-actin Dynamics via Fluorescent Speckle Microscopy (FSM)

Published on: August 5, 2009

Laser speckle imaging in the spatial frequency domain.

Amaan Mazhar, David J Cuccia, Tyler B Rice

    Biomedical Optics Express
    |June 24, 2011
    PubMed
    Summary

    Integrating laser speckle imaging with spatial frequency domain imaging improves subsurface tissue perfusion quantification. This approach minimizes scattering and absorption effects, enabling more accurate blood flow and oxygenation mapping.

    Keywords:
    (170.3660) Light propagation in tissues(170.6480) Spectroscopy, speckle

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    Published on: August 30, 2017

    Area of Science:

    • Biomedical Optics
    • Medical Imaging
    • Photonic Measurement

    Background:

    • Laser Speckle Imaging (LSI) maps tissue perfusion by analyzing laser light interference patterns.
    • Limitations in LSI include unknown effects of photon path length, hindering absolute quantification.
    • Multiple scattering and absorption effects complicate accurate perfusion measurements.

    Purpose of the Study:

    • To integrate Laser Speckle Imaging (LSI) with Spatial Frequency Domain Imaging (SFDI).
    • To suppress multiple scattering and absorption effects for improved quantification of subsurface tissue perfusion.
    • To develop a method for simultaneous mapping of blood flow and tissue oxygenation.

    Main Methods:

    • Integration of LSI with SFDI using high spatial frequency illumination (0.24 mm⁻¹).
    • Development of an SFDI-adapted correlation diffusion model.
    • Depth-sensitive speckle contrast measurements in phantoms using separated light sources (2 mm and 4 mm).
    • In vivo imaging during finger occlusion to mimic absorption changes.

    Main Results:

    • High spatial frequency illumination (0.24 mm⁻¹) significantly reduced the impact of absorption changes on speckle contrast (1% vs. 25% with unmodulated illumination).
    • In vivo measurements showed a 10% relative speckle contrast change at 0.26 mm⁻¹ during occlusion, compared to 60% at 0 mm⁻¹.
    • Demonstrated depth-sensitive speckle contrast separation in phantoms.

    Conclusions:

    • High spatial frequency illumination effectively suppresses scattering and absorption effects in LSI.
    • The integrated LSI-SFDI approach enables more accurate quantification of subsurface tissue perfusion.
    • This method allows simultaneous mapping of blood flow and oxygenation, informing tissue metabolism studies.