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Related Concept Videos

X-ray Imaging01:24

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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...
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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
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Hard X-ray full-field nanoimaging using a direct photon-counting detector.

Silja Flenner1, Johannes Hagemann2, Felix Wittwer2

  • 1Helmholtz-Zentrum Hereon, Max-Planck-Strasse 1, 21502 Geesthacht, Germany.

Journal of Synchrotron Radiation
|March 9, 2023
PubMed
Summary

A new single-photon-counting detector improves X-ray nanoimaging for biological samples. This advancement enhances time resolution for in situ studies while maintaining high signal-to-noise levels.

Keywords:
Zernike phase contrastfull-field X-ray microscopynanotomographynear-field holographynear-field ptychographyphase contrastsingle-photon-counting detector

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Area of Science:

  • * Advanced materials science and condensed matter physics.
  • * Biological and medical imaging.
  • * Nanotechnology and materials characterization.

Background:

  • * Full-field X-ray nanoimaging is crucial across various scientific disciplines.
  • * Phase contrast methods are essential for imaging low-absorbing biological and medical samples.
  • * Established techniques include Zernike phase contrast transmission X-ray microscopy, near-field holography, and near-field ptychography.

Purpose of the Study:

  • * To address the challenges of lower signal-to-noise ratio and longer scan times in high-resolution nanoimaging.
  • * To implement and evaluate a single-photon-counting detector at the P05 beamline.
  • * To assess the impact of the detector on time resolution and signal quality in nanoimaging techniques.

Main Methods:

  • * Implementation of a single-photon-counting detector at the nanoimaging endstation of the P05 beamline at PETRA III.
  • * Utilizing a long sample-to-detector distance to achieve high spatial resolution.
  • * Application of three established nanoscale phase contrast methods: Zernike phase contrast transmission X-ray microscopy, near-field holography, and near-field ptychography.

Main Results:

  • * Achieved spatial resolutions below 100 nm for all three nanoimaging techniques.
  • * Demonstrated that the single-photon-counting detector significantly increases time resolution for in situ nanoimaging.
  • * Maintained a high signal-to-noise level despite the enhanced time resolution and spatial resolution.

Conclusions:

  • * The integration of a single-photon-counting detector with a long sample-to-detector distance is effective for advancing nanoimaging capabilities.
  • * This setup overcomes previous limitations in time resolution and signal quality for in situ studies.
  • * The developed method offers a promising approach for high-resolution, time-resolved imaging of delicate samples.