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X-ray Diffraction of Biological Samples01:10

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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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Non-invasive 3D-Visualization with Sub-micron Resolution Using Synchrotron-X-ray-tomography
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Interior x-ray diffraction tomography with low-resolution exterior information.

Zheyuan Zhu1,2, Alexander Katsevich3, Shuo Pang1

  • 1CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, FL 32816, United States of America.

Physics in Medicine and Biology
|December 13, 2018
PubMed
Summary
This summary is machine-generated.

X-ray diffraction tomography (XDT) imaging time is reduced by a new quasi-interior method. This technique uses limited exterior data to improve reconstruction quality in the region-of-interest, making XDT faster and more practical.

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Area of Science:

  • Materials Science
  • Physics
  • Imaging Technology

Background:

  • X-ray diffraction tomography (XDT) offers superior material contrast over conventional computed tomography (CT).
  • Long acquisition times (tens of hours) limit XDT's practical application, especially for table-top systems.
  • Interior XDT aims to reduce scan time and radiation dose by focusing on a region-of-interest (ROI).

Purpose of the Study:

  • To develop a novel quasi-interior XDT scheme for efficient ROI reconstruction.
  • To overcome the non-uniqueness and reconstruction errors inherent in conventional interior tomography.
  • To eliminate the need for prior knowledge of the object's support or geometry.

Main Methods:

  • Proposed a quasi-interior XDT approach incorporating a small fraction of exterior projection data.
  • Validated the method through phantom simulations and experimental measurements.
  • Compared reconstruction quality against total-variation-based reconstruction and sinogram extrapolation.

Main Results:

  • Phantom simulations showed a ~50% improvement in reconstruction quality with minimal exterior data (17%).
  • Experimental results demonstrated enhanced spatial and X-ray diffraction profile reconstructions.
  • The quasi-interior method significantly outperformed existing reconstruction techniques.

Conclusions:

  • The quasi-interior XDT scheme effectively improves ROI reconstruction quality.
  • This method obviates the need for prior object information, simplifying implementation.
  • The approach facilitates integration with fast filtered back-projection algorithms for real-time XDT imaging.