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

Schröter, Tobias J.; Koch, Frieder J.; Kunka, Danays; Meyer, Pascal; Tietze, Sabrina; Engelhardt, Sabine; Zuber, Marcus; Baumbach, Tilo; Willer, Konstantin; Birnbacher, Lorenz; Prade, Friedrich; Pfeiffer, Franz; Reichert, Klaus-Martin; Hofmann, Andreas; Mohr, Jürgen

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. ... mehr

DOI: 10.1088/1361-6463/aa6e85
Zitationen: 16
Zitationen: 14
Zugehörige Institution(en) am KIT Institut für Angewandte Informatik (IAI)
Institut für Mikrostrukturtechnik (IMT)
Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Karlsruhe Nano Micro Facility (KNMF)
Laboratorium für Applikationen der Synchrotronstrahlung (LAS)
Karlsruhe School of Optics & Photonics (KSOP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 0022-3727, 1361-6463, 0262-8171, 0508-3443
KITopen-ID: 1000070126
HGF-Programm 43.23.02 (POF III, LK 01) X-Ray Optics
Erschienen in Journal of physics / D
Verlag IOP Publishing
Band 50
Heft 22
Seiten Art.Nr. 225401
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