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Related Concept Videos

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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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: Jun 22, 2026

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
10:28

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

Published on: July 5, 2016

High-resolution quantitative phase-contrast microscopy by digital holography.

Christopher Mann, Lingfeng Yu, Chun-Min Lo

    Optics Express
    |June 6, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Improved digital holography techniques yield high-resolution quantitative phase-contrast microscopy images. This method offers precise noise control and accurate imaging of cellular structures, enhancing microscopy capabilities.

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    Quantifying Microorganisms at Low Concentrations Using Digital Holographic Microscopy (DHM)

    Published on: November 1, 2017

    Area of Science:

    • Optical imaging
    • Microscopy
    • Biophysics

    Background:

    • Quantitative phase-contrast microscopy (QPCM) is crucial for label-free imaging of biological specimens.
    • Traditional holographic techniques often suffer from noise and limited resolution.
    • High-fidelity imaging is essential for detailed analysis of cellular structures.

    Purpose of the Study:

    • To enhance digital holography techniques for improved QPCM.
    • To achieve high-resolution, high-fidelity holographic phase images.
    • To minimize noise and improve the accuracy of phase measurements.

    Main Methods:

    • Utilizing the angular spectrum method for holographic optical field calculation.
    • Implementing advanced digital holography algorithms.
    • Acquiring holographic phase images of SKOV-3 ovarian cancer cells.

    Main Results:

    • Achieved 0.5 µm diffraction-limited lateral resolution.
    • Images are largely immune to coherent noise.
    • Phase profile accuracy is within approximately 30 nm of optical thickness.
    • Successfully visualized intracellular and intranuclear organelles with clarity.

    Conclusions:

    • The improved digital holography technique provides high-resolution and high-fidelity QPCM.
    • The angular spectrum method effectively controls spurious noise.
    • This technique enables accurate quantitative analysis of cellular structures, including organelles.