25 September 2017 High-resolution grating interferometer for phase-contrast imaging at PETRA III
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Phase-contrast imaging has proven to be a valuable tool when investigating weak absorbing materials like soft tissue, due to its increased contrast compared to conventional absorption-contrast imaging. While propagation-based phase-contrast is an ideal tool to achieve highest resolution at a good contrast for almost not-absorbing material, it quickly comes to its limitations on applications demanding for a high dynamic range in contrast. For those applications grating-based phase-contrast is the tool of choice, although it lacks of spatial resolution compared to inline phase-contrast or attenuation-based microCT. To reduce this gap in spatial resolution we equipped the two PETRA III beamlines P05 and P07 with a customized set of mechanics to maximize the performance of the interferometer. After latest optimization steps our system allows for phase-contrast measurements in a continuous energy range between 10 keV and 80 keV . Dependent on investigated material and energy the setup is capable to achieve a spatial resolution of 5 μm on a field of view of 6.5 mm. We will present our implementation of grating-based phase-contrast computed tomography for fast and high-resolution measurements at the PETRA III along with its recent optimization, and demonstrate its performance based on different kinds of applications.
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A. Hipp, J. Moosmann, J. Herzen, J. U. Hammel, A. Schreyer, F. Beckmann, "High-resolution grating interferometer for phase-contrast imaging at PETRA III", Proc. SPIE 10391, Developments in X-Ray Tomography XI, 1039108 (25 September 2017); doi: 10.1117/12.2273892; https://doi.org/10.1117/12.2273892

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