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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...
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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...
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Related Experiment Video

Updated: May 8, 2026

X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
08:30

X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging

Published on: September 11, 2011

Full-wave approach for x-ray phase imaging.

Yongjin Sung1, Colin J R Sheppard, George Barbastathis

  • 1Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA. yongjin.sung@gmail.com

Optics Express
|August 14, 2013
PubMed
Summary
This summary is machine-generated.

We developed a new full-wave model for X-ray phase imaging, suitable for thick objects like luggage and patients. This advanced model accurately calculates phase images from various X-ray sources, enhancing X-ray phase tomography applications.

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Area of Science:

  • Wave optics
  • X-ray imaging
  • Phase contrast imaging

Background:

  • X-ray phase imaging offers enhanced contrast for materials and biological tissues compared to conventional absorption-based X-ray imaging.
  • Existing forward models for X-ray phase imaging often rely on paraxial approximations, limiting their applicability to thick or large objects.

Purpose of the Study:

  • To present a rigorous, non-paraxial, full-wave forward model for X-ray phase imaging.
  • To enable accurate phase image calculation for large and thick objects using cone-shaped X-ray beams.
  • To integrate light-matter interaction and propagation into a unified wave optics framework for X-ray phase tomography.

Main Methods:

  • Developed a forward model based on the first Rytov approximation for wave propagation.
  • Unified light-matter interaction and free-space propagation within an integrated wave optics framework.
  • Applied the model to simulate X-ray phase imaging with cone-shaped beams and arbitrary source shapes.

Main Results:

  • The model is valid for large and thick objects, overcoming limitations of paraxial approximations.
  • Accurate calculation of X-ray phase images is achieved for various object types and X-ray source configurations.
  • Demonstrated the model's capability to handle arbitrary source shapes and cone-shaped illumination.

Conclusions:

  • This work introduces the first non-paraxial, full-wave forward model for X-ray phase imaging.
  • The developed model significantly advances the capabilities of X-ray phase tomography, particularly for challenging samples.
  • The unified framework provides a robust tool for simulating and understanding X-ray phase contrast phenomena.