High-resolution grating interferometer for phase-contrast imaging at PETRA III

A. Hipp; J. Moosmann; J. Herzen; J. U. Hammel; A. Schreyer; F. Beckmann

doi:10.1117/12.2273892

25 September 2017 High-resolution grating interferometer for phase-contrast imaging at PETRA III

A. Hipp, J. Moosmann, J. Herzen, J. U. Hammel, A. Schreyer, F. Beckmann

Proceedings Volume 10391, Developments in X-Ray Tomography XI; 1039108 (2017) https://doi.org/10.1117/12.2273892
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

Abstract

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.

Citation Download Citation

A. Hipp, J. Moosmann, J. Herzen, J. U. Hammel, A. Schreyer, and 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); https://doi.org/10.1117/12.2273892

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