Large-area full field x-ray differential phase-contrast imaging using 2D tiled gratings

Schroter TJ, Koch FJ, Kunka D, Meyer P, Tietze S, Engelhardt S, Zuber M, Baumbach T, Willer K, Birnbacher L, Prade F, Pfeiffer F, Reichert KM, Hofmann A, Mohr J (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Journal of Physics D: Applied Physics IOP Publishing: Hybrid Open Access

Book Volume: 50

Article Number: 225401

Journal Issue: 22

DOI: 10.1088/1361-6463/aa6e85

Abstract

Grating-based x-ray differential phase-contrast imaging (DPCI) is capable of acquiring information based on phase-shift and dark-field signal, in addition to conventional x-ray absorption-contrast. Thus DPCI gives an advantage to investigate composite materials with component wise similar absorption properties like soft tissues. Due to technological challenges in fabricating high quality gratings over a large extent, the field of view (FoV) of the imaging systems is limited to a grating area of a couple of square centimeters. For many imaging applications (e.g. in medicine), however, a FoV that ranges over several ten centimeters is needed. In this manuscript we propose to create large area gratings of theoretically any extent by assembling a number of individual grating tiles. We discuss the precision needed for alignment of each microstructure tile in order to reduce image artifacts and to preserve minimum 90% of the sensitivity obtainable with a monolithic grating. To achieve a reliable high precision alignment a semiautomatic assembly system consisting of a laser autocollimator, a digital microscope and a force sensor together with positioning devices was built. The setup was used to tile a first four times four analyzer grating with a size of 200 mm × 200 mm together with a two times two phase grating. First imaging results prove the applicability and quality of the tiling concept.

Involved external institutions

Karlsruhe Institute of Technology (KIT) DE Germany (DE) Technische Universität München (TUM) DE Germany (DE)

How to cite

APA:

Schroter, T.J., Koch, F.J., Kunka, D., Meyer, P., Tietze, S., Engelhardt, S.,... Mohr, J. (2017). Large-area full field x-ray differential phase-contrast imaging using 2D tiled gratings. Journal of Physics D: Applied Physics, 50(22). https://doi.org/10.1088/1361-6463/aa6e85

MLA:

Schroter, Tobias J., et al. "Large-area full field x-ray differential phase-contrast imaging using 2D tiled gratings." Journal of Physics D: Applied Physics 50.22 (2017).

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