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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...
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
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

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.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal crystal...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
Radiological Investigation I: X-ray and CT01:30

Radiological Investigation I: X-ray and CT

Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and the...

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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Fourier X-ray scattering radiography yields bone structural information.

Han Wen1, Eric E Bennett, Monica M Hegedus

  • 1National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA. wenh@nhlbi.nih.gov

Radiology
|May 1, 2009
PubMed
Summary

Fourier x-ray scattering imaging revealed distinct microscopic structures in bone. Cortical bone showed anisotropic scattering due to aligned fibrils, while trabecular bone exhibited a heterogeneous pattern linked to its porous matrix.

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Area of Science:

  • Biomedical Imaging
  • Materials Science
  • Skeletal Biology

Background:

  • Understanding bone microstructure is crucial for diagnosing and treating skeletal diseases.
  • Current imaging techniques have limitations in resolving the fine details of bone's hierarchical structure.

Purpose of the Study:

  • To characterize microscopic structures of cortical and trabecular bone using Fourier x-ray scattering imaging.
  • To differentiate bone tissue types based on scattering and phase-contrast signals.

Main Methods:

  • Fourier x-ray scattering imaging technique applied to ex vivo rat tibia and pig toe bone samples.
  • Utilized grid masks and Fourier spectral filters to generate attenuation, scattering, and phase-contrast images from a single exposure.
  • Statistical analysis (Wilcoxon signed rank test, F tests) to compare scattering signals and heterogeneity between bone types and orientations.

Main Results:

  • Cortical bone exhibited significantly higher scattering signals when the grid was parallel to the periosteal surface, indicating anisotropic properties.
  • Trabecular bone showed significantly higher heterogeneity in scattering and phase-contrast signals compared to cortical bone.
  • Distinct scattering patterns were observed, reflecting the underlying microstructural differences.

Conclusions:

  • The anisotropic scattering signal in cortical bone is attributed to the ordered alignment of mineralized collagen fibrils.
  • The granular pattern in trabecular bone scattering and phase-contrast images is explained by the porosity of the mineralized matrix.
  • Fourier x-ray scattering imaging provides valuable insights into bone microstructure and tissue heterogeneity.