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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...
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...
Imaging Studies for Cardiovascular System III: X-Ray01:20

Imaging Studies for Cardiovascular System III: X-Ray

The most common cardiovascular diagnostic test is an X-ray. It produces images of the heart, blood vessels, and adjacent structures.
Definition and Purpose
An X-ray, or radiograph, is a non-invasive method that uses ionizing radiation to take images of internal structures. It is mainly used in cardiac imaging to examine the heart, lungs, and major blood vessels, aiming to identify abnormalities in the heart's size, shape, and position, such as heart failure, congenital defects, and vascular...

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Related Experiment Video

Updated: Jun 10, 2026

High Spatial Resolution Chemical Imaging of Implant-Associated Infections with X-ray Excited Luminescence Chemical Imaging Through Tissue
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Published on: September 30, 2022

Low-dose, simple, and fast grating-based X-ray phase-contrast imaging.

Peiping Zhu1, Kai Zhang, Zhili Wang

  • 1Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China.

Proceedings of the National Academy of Sciences of the United States of America
|July 21, 2010
PubMed
Summary
This summary is machine-generated.

A novel X-ray imaging technique, "reverse projection," enhances phase contrast without multiple exposures. This method significantly reduces radiation dose and improves efficiency for advanced imaging applications.

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Area of Science:

  • Medical Imaging
  • Physics
  • Materials Science

Background:

  • Phase-sensitive X-ray imaging offers higher contrast than absorption-based methods.
  • Grating interferometry in hard X-ray phase imaging addresses limitations of earlier techniques.
  • Conventional methods require phase-stepping, involving multiple radiographic projections.

Purpose of the Study:

  • To introduce an innovative X-ray tomographic phase-contrast imaging approach.
  • To extract phase-contrast signals without phase stepping using grating interferometry.
  • To enable faster and lower-dose phase-contrast imaging.

Main Methods:

  • Development of a "reverse projection" method for grating-based X-ray interferometry.
  • Extraction of phase-contrast information without acquiring multiple projections.
  • Application in X-ray tomography for enhanced imaging.

Main Results:

  • The "reverse projection" method achieves high sensitivity and contrast.
  • Significantly reduced radiation dose delivered to the sample.
  • Improved imaging efficiency without compromising image quality.

Conclusions:

  • The new technique facilitates dose reduction and enhances efficiency in X-ray phase-contrast imaging.
  • This method is crucial for imaging sensitive biological specimens.
  • It paves the way for in vivo studies using fast, low-dose phase-contrast X-ray imaging.