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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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Quantitative Optical Microscopy: Measurement of Cellular Biophysical Features with a Standard Optical Microscope
14:09

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Published on: April 7, 2014

Quantitative imaging of complex samples by spiral phase contrast microscopy.

Stefan Bernet, Alexander Jesacher, Severin Fürhapter

    Optics Express
    |June 12, 2009
    PubMed
    Summary

    Quantitative phase and amplitude reconstruction is achieved using a spiral phase filter with multiple rotational orientations. This advanced microscopic imaging technique reveals detailed information from complex samples like cells.

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    Area of Science:

    • Optical microscopy
    • Image processing
    • Biophysics

    Background:

    • Spatial spiral phase filters enhance edges and create shadow effects in microscopic imaging.
    • Existing methods struggle to quantitatively reconstruct both amplitude and phase information from complex samples.

    Purpose of the Study:

    • To demonstrate a method for quantitative reconstruction of amplitude and phase information from complex microscopic samples.
    • To utilize a sequence of spatially filtered images with varying spiral phase plate orientations.

    Main Methods:

    • Employing a spatial spiral phase filter in the Fourier plane of a microscopic imaging setup.
    • Recording at least 3 spatially filtered images with different rotational orientations of the spiral phase plate.
    • Applying image processing for quantitative reconstruction of amplitude and phase.

    Main Results:

    • Successfully achieved quantitative reconstruction of both amplitude and phase information.
    • Demonstrated the method's efficacy on a calibrated phase sample.
    • Validated the technique using a biological sample: an epithelial cheek cell.

    Conclusions:

    • A sequence of spatially filtered images with rotational variations enables quantitative phase and amplitude retrieval.
    • This method provides a powerful tool for analyzing complex microscopic samples with mixed absorptive and refractive properties.
    • The technique offers a significant advancement in microscopic imaging for biological and material science applications.