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
Book Volume: 50
Article Number: 225401
Journal Issue: 22
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.
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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