Liquid-metal-jet anode electron-impact x-ray source

Hemberg, Oscar; Otendal, Mikael; Hertz, Hans M.

doi:10.1063/1.1602157

Cited by 196 publications

(123 citation statements)

References 9 publications

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“…The translation of the speckle-based technique to a laboratory source was first demonstrated with the single-shot XST technique [85] at a liquid metal-jet source (Excillum) [164]. Transmission, differential phase and dark-field images were successfully reconstructed for several samples, such as the plastic flower shown in Figure 7.…”

Section: Translation To Laboratory Sources and High X-ray Energiesmentioning

confidence: 99%

State of the Art of X-ray Speckle-Based Phase-Contrast and Dark-Field Imaging

Zdora

2018

J. Imaging

106

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Abstract:In the past few years, X-ray phase-contrast and dark-field imaging have evolved to be invaluable tools for non-destructive sample visualisation, delivering information inaccessible by conventional absorption imaging. X-ray phase-sensing techniques are furthermore increasingly used for at-wavelength metrology and optics characterisation. One of the latest additions to the group of differential phase-contrast methods is the X-ray speckle-based technique. It has drawn significant attention due to its simple and flexible experimental arrangement, cost-effectiveness and multimodal character, amongst others. Since its first demonstration at highly brilliant synchrotron sources, the method has seen rapid development, including the translation to polychromatic laboratory sources and extension to higher-energy X-rays. Recently, different advanced acquisition schemes have been proposed to tackle some of the main limitations of previous implementations. Current applications of the speckle-based method range from optics characterisation and wavefront measurement to biomedical imaging and materials science. This review provides an overview of the state of the art of the X-ray speckle-based technique. Its basic principles and different experimental implementations as well as the the latest advances and applications are illustrated. In the end, an outlook for anticipated future developments of this promising technique is given.

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Section: Translation To Laboratory Sources and High X-ray Energiesmentioning

confidence: 99%

State of the Art of X-ray Speckle-Based Phase-Contrast and Dark-Field Imaging

Zdora

2018

J. Imaging

106

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“…The use of monochromatic radiation will, therefore, be of benefit but at the cost of a significant photon flux loss. However, the recent developments and start-ups of more intense laboratory x-ray sources using liquid anode 4 reaching brilliance of the bending magnet sources in combination with collimation Montel optics 5 and high-efficient direct conversion integrating or singlephoton counting x-ray detectors 6,7 allow us to employ in an efficient way the x-ray crystal optics for imaging applications in laboratory conditions. Such a setup will allow for quantitative scattering-free x-ray imaging.…”

Section: Introductionmentioning

confidence: 99%

Calculations and surface quality measurements of high-asymmetry angle x-ray crystal monochromators for advanced x-ray imaging and metrological applications

et al. 2015

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Abstract. We present the numerical optimization and the technological development progress of x-ray optics based on asymmetric germanium crystals. We show the results of several basic calculations of diffraction properties of germanium x-ray crystal monochromators and of an analyzer-based imaging method for various asymmetry factors using an x-ray energy range from 8 to 20 keV. The important parameter of highly asymmetric monochromators as image magnifiers or compressors is the crystal surface quality. We have applied several crystal surface finishing methods, including advanced nanomachining using single-point diamond turning (SPDT), conventional mechanical lapping, chemical polishing, and chemomechanical polishing, and we have evaluated these methods by means of atomic force microscopy, diffractometry, reciprocal space mapping, and others. Our goal is to exclude the chemical etching methods as the final processing technique because it causes surface undulations. The aim is to implement very precise deterministic methods with a control of surface roughness down to 0.1 nm. The smallest roughness (∼0.3 nm), best planarity, and absence of the subsurface damage were observed for the sample which was machined using an SPDT with a feed rate of 1 mm∕min and was consequently polished using a fine polishing 15-min process with a solution containing SiO 2 nanoparticles (20 nm).

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“…This may also be the reason why we did not observe the organ of Corti so far. To this end, we demonstrate a substantial reduction in accumulation time, using high-brilliance liquid-metal-jet x-ray source technology [31][32][33] (9.25 keV characteristic photon energy, 60 kVp, 40 W e-beam power, asymmetric spot size of about FWHM src;h: ¼ 4 lm and FWHM src;v: ¼ 7 lm) and a fast complimentary metal-oxide-semiconductor detector. 17 A tomogram with 2 lm voxel size (z 1 ¼ 77 mm; z 2 ¼ 168 mm) which reveals soft tissue structures in the region of the organ of Corti and the tectorial membrane ( Fig.…”

mentioning

confidence: 99%