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3D X-ray film: Rapid movements in real time
Date:3/13/2014

This news release is available in German.

How does the hip joint of a crawling weevil move? A technique to record 3D X-ray films showing the internal movement dynamics in a spatially precise manner and, at the same time, in the temporal dimension has now been developed by researchers at ANKA, KIT's Synchrotron Radiation Source. The scientists applied this technique to a living weevil. From up to 100,000 two-dimensional radiographs per second, they generated complete 3D film sequences in real time or slow motion. The results are now published in the Proceedings of the National Academy of Sciences (PNAS) DOI: 10.1073/pnas.1308650111.

Three-dimensional radiographs represent internal structures, but do not provide any information about movement sequences. Conventional computer tomography is not efficient enough to reproduce movement in a spatially precise manner and, at the same time, in the temporal dimension. Every individual three-dimensional image, called tomogram, is reconstructed from hundreds of two-dimensional radiographs. "To produce highly resolved tomograms at such recording speed, we had to adjust every setting screw, from the X-ray source to the pixel detector and we optimally attuned all process steps to each other," Tomy dos Santos Rolo says. The doctoral student is the leading developer of the experimental setup. By making the 3D image frequencies approach the image rates known for 2D cine films, he reached the world record in high-speed tomography, i.e. a real 3D film with microscopic magnification.

For scientific evaluation, the three-dimensional contours of anatomic structures have to be clearly visible. This is achieved by the so-called phase contrast. If highly parallel X-rays pass the biological examination object, wave optics phen
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Contact: Monika Landgraf
presse@kit.edu
49-721-608-47414
Karlsruher Institut fr Technologie (KIT)
Source:Eurekalert  

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