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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
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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Related Experiment Video

Updated: Jul 7, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Imaging very-low-contrast objects in breastlike scattering media with a time-resolved method.

D J Hall, J C Hebden, D T Delpy

    Applied Optics
    |February 12, 2008
    PubMed
    Summary

    Time-gating enhances imaging of scattering objects in dense media more than absorbing ones. This method shows potential for detecting subtle differences in tissue optical properties, crucial for medical imaging.

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    Area of Science:

    • Biomedical optics
    • Medical imaging physics

    Background:

    • Imaging low-contrast targets in scattering media is challenging.
    • Time-resolved methods offer potential for improved contrast detection.

    Purpose of the Study:

    • To evaluate the effectiveness of time-gating for imaging low-contrast scattering and absorbing objects.
    • To quantify contrast enhancement in highly scattering media.

    Main Methods:

    • Experiments used breast-like phantoms with embedded cylindrical objects.
    • Objects varied in scattering and absorption coefficients relative to the background.
    • Time-resolved imaging was employed to assess contrast.

    Main Results:

    • Time-gating significantly improved contrast for scattering inhomogeneities.
    • Contrast enhancement for absorbing inhomogeneities was less pronounced.
    • A diffusion-based model supported the experimental findings.

    Conclusions:

    • Time-gating is more effective for enhancing contrast of scattering features than absorbing ones.
    • The method's efficacy for absorbing targets depends on time-gate duration.
    • This technique shows promise for improved detection in biomedical imaging.