Publisher DOI: 10.1107/S1600577518015242
Title: Nanoporous gold: a hierarchical and multiscale 3D test pattern for characterizing X-ray nano-tomography systems
Language: English
Authors: Larsson, Emanuel 
Gürsoy, Doğa 
De Carlo, Francesco 
Lilleodden, Erica 
Storm, Malte 
Wilde, Fabian 
Hu, Kaixiong 
Müller, Martin 
Greving, Imke 
Issue Date: Jan-2019
Source: Journal of Synchrotron Radiation 1 (26): 194-204 (2019-01)
Journal or Series Name: Journal of synchrotron radiation 
Abstract (english): Full-field transmission X-ray microscopy (TXM) is a well established technique, available at various synchrotron beamlines around the world as well as by laboratory benchtop devices. One of the major TXM challenges, due to its nanometre-scale resolution, is the overall instrument stability during the acquisition of the series of tomographic projections. The ability to correct for vertical and horizontal distortions of each projection image during acquisition is necessary in order to achieve the effective 3D spatial resolution. The effectiveness of such an image alignment is also heavily influenced by the absorption properties and strong contrast of specific features in the scanned sample. Here it is shown that nanoporous gold (NPG) can be used as an ideal 3D test pattern for evaluating and optimizing the performance of a TXM instrument for hard X-rays at a synchrotron beamline. Unique features of NPG, such as hierarchical structures at multiple length scales and high absorbing capabilities, makes it an ideal choice for characterization, which involves a combination of a rapid-alignment algorithm applied on the acquired projections followed by the extraction of a set of both 2D- and 3D-descriptive image parameters. This protocol can be used for comparing the efficiency of TXM instruments at different synchrotron beamlines in the world or benchtop devices, based on a reference library of scanned NPG samples, containing information about the estimated horizontal and vertical alignment values, 2D qualitative parameters and quantitative 3D parameters. The possibility to tailor the ligament sizes of NPG to match the achievable resolution in combination with the high electron density of gold makes NPG an ideal 3D test pattern for evaluating the status and performance of a given synchrotron-based or benchtop-based TXM setup.
ISSN: 0909-0495
Institute: Keramische Hochleistungswerkstoffe M-9 
Type: (wissenschaftlicher) Artikel
Funded by: Deutsche Forschungsgemeinschaft within SFB 986 ‘Tailor-Made Multi-Scale Materials Systems: M3’, projects B2, B4 and Z2.
Project: SFB 986: Teilprojekt B2 - Feste und leichte Hybridwerkstoffe auf Basis nanoporöser Metalle 
SFB 986, Teilproject B4 - Mikromechanisches Materialverhalten hierarchischer Werkstoffe 
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