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New simple setup for X-ray phase contrast
Date:7/11/2014

This news release is available in German.

X-ray phase-contrast imaging is a method that uses the refraction of X-rays through a specimen instead of attenuation resulting from absorption. The images produced with this method are often of much higher quality than those based on absorption. The scientists in the team of Prof. Franz Pfeiffer are particularly interested in developing new approaches for biomedical X-ray imaging and therapy including X-ray phase-contrast imaging. One main goal is to make this method available for clinical applications such as diagnosis of cancer or osteoporosis in the future.

In their new study, the scientists have now developed an extremely simple setup to produce X-ray phase-contrast images. The solution to many of their difficulties may seem counter-intuitive: Scramble the X-rays to give them a random structure. These speckles, as they are called in the field, encode a wealth of information on the sample as they travel through it. The scrambled X-rays are collected with a high-resolution X-ray camera, and the information is then extracted in a post-measurement analysis step.

High accuracy and new X-ray source

Using their new technique, the researchers have demonstrated the efficiency and versatility of their approach. "From a single measurement, we obtain an attenuation image, the phase image, but also a dark-field image," explains Dr. Irene Zanette, lead author of the publication. "The phase image can be used to measure accurately the specimen's projected thickness. The dark-field image can be just as important because it maps structures in the specimen too small to be resolved, such as cracks or fibers in materials," she adds.

The source's high brightness is also key to these results. "In the source we use
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Contact: Vera Siegler
vera.siegler@tum.de
49-892-892-2731
Technische Universitaet Muenchen
Source:Eurekalert

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