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Related Concept Videos

X-ray Imaging01:24

X-ray Imaging

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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 Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
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Phase-preserving beam expander for biomedical X-ray imaging.

Mercedes Martinson1, Nazanin Samadi2, Bassey Bassey1

  • 1Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Rm 163, Saskatoon, Saskatchewan, Canada S7N 5E2.

Journal of Synchrotron Radiation
|May 2, 2015
PubMed
Summary

Researchers developed a new

Keywords:
beam expanderbent Laue diffractionbiomedical imagingdouble-crystal monochromatordynamic imagingin-line phase imagingpolychromatic focus

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Area of Science:

  • Biomedical Imaging
  • Synchrotron Radiation Science
  • Optics

Background:

  • BioMedical Imaging and Therapy beamlines at Canadian Light Source utilize phase-based imaging.
  • Small vertical beam size limits imaging of biological samples, necessitating vertical scanning.
  • Previous bent Laue monochromator designs suffered from beam distortion, hindering phase imaging.

Purpose of the Study:

  • To overcome limitations of vertical beam size in phase-based imaging.
  • To develop and evaluate a beam-expanding monochromator that preserves beam divergence.
  • To enable full-field phase-based imaging techniques at the Canadian Light Source.

Main Methods:

  • Implemented a bent Laue beam-expanding monochromator under a 'magic condition' matching focal lengths.
  • Evaluated experimental parameters (asymmetry, Bragg angles) using knife-edge and in-line phase imaging.
  • Compared beam divergence with a baseline flat Bragg double-crystal monochromator.

Main Results:

  • The 'magic condition' minimized beam divergence in the diffraction plane, with differences <10% compared to the baseline.
  • Phase fringes in biological sample images confirmed the viability of the technique.
  • Successful in-line phase imaging was achieved despite sub-optimal energy and asymmetry.

Conclusions:

  • The developed bent Laue monochromator under the 'magic condition' effectively expands the beam while preserving divergence.
  • This advancement enables full-field phase-based imaging for biological samples.
  • The technique is suitable for use at the BioMedical Imaging and Therapy beamlines.