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New x-ray vision can reveal internal structure of objects

Thu, 10/03/2013 - 12:11pm

Scientists have developed a new kind of “x-ray vision” that is able to peer inside an object and map the 3-D distribution of its nano-properties in real time.

Univ. of Manchester researchers, working with colleagues in the U.K., Europe and the U.S., say the novel imaging technique could have a wide range of applications across many disciplines, such as materials science, geology, environmental science and medical research.

“This new imaging method—termed pair distribution function-computed tomography—represents one of the most significant developments in x-ray micro tomography for almost 30 years,” said Professor Robert Cernik in Manchester’s School of Materials.

“Using this method we are able to image objects in a non-invasive manner to reveal their physical and chemical nano-properties and relate these to their distribution in three-dimensional space at the micron scale.

“Such relationships are key to understanding the properties of materials and so could be used to look at in-situ chemical reactions, probe stress-strain gradients in manufactured components, distinguish between healthy and diseased tissue, identify minerals and oil-bearing rocks or identify illicit substances or contraband in luggage.”

The research, published in the journal Nature Communications, explains how the new imaging technique uses scattered x-rays to form a 3-D reconstruction of the image.

“When x-rays hit an object they are either transmitted, absorbed or scattered,” explained Professor Cernik. “Standard x-ray tomography works by collecting the transmitted beams, rotating the sample and mathematically reconstructing a 3-D image of the object. This is only a density contrast image, but by a similar method using the scattered x-rays instead we can obtain information about the structure and chemistry of the object even if it has a nanocrystalline structure.

“By using this method we are able to build a much more detailed image of the object and, for the first time, separate the nanostructure signals from the different parts of a working device to see what the atoms are doing in each location, without dismantling the object.”

Pair Distribution Function-Computed Tomography

Source: Univ. of Manchester

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