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Related Concept Videos

X-ray Imaging01:24

X-ray Imaging

German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with X-rays, and by 1900, X-ray was widely...
Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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Overview of Microscopy Techniques01:22

Overview of Microscopy Techniques

The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
X-ray Diffraction of Biological Samples01:10

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X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
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High Resolution 3D Imaging of Ex-Vivo Biological Samples by Micro CT
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X-ray optics: a technique for high resolution imaging.

W Cash

    Applied Optics
    |May 22, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Grazing incidence optics show angle-dependent errors. Stopping down the aperture significantly improves resolution, approaching the diffraction limit for telescopes.

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    Area of Science:

    • Optics and Photonics
    • Telescope Design
    • Surface Metrology

    Background:

    • Grazing incidence optics are susceptible to scattering and figure errors.
    • These errors are anisotropic, being larger in the plane of incidence than out-of-plane.
    • The magnitude of error anisotropy is dependent on the graze angle (theta), proportional to 1/sintheta.

    Purpose of the Study:

    • To investigate the impact of aperture reduction on the resolution of grazing incidence optics.
    • To demonstrate the potential for significant resolution enhancement in grazing incidence telescopes.
    • To validate theoretical predictions with experimental data.

    Main Methods:

    • Simulating or analyzing the point spread function (PSF) of a grazing incidence telescope with a reduced annular aperture.
    • Calculating the effective width of the PSF in the plane of incidence.
    • Comparing the achieved resolution with the theoretical diffraction limit.

    Main Results:

    • Stopping down the aperture of a grazing incidence telescope results in a highly elliptical point spread function.
    • The PSF width in the plane of incidence can be reduced by a factor of sintheta.
    • Resolution improvements of up to 100 times were observed, approaching the diffraction limit.

    Conclusions:

    • Aperture reduction is a practical and effective method for enhancing the resolution of grazing incidence telescopes.
    • The anisotropic nature of errors in grazing incidence optics can be leveraged for improved imaging performance.
    • Experimental validation confirms the significant resolution gains achievable through this technique.