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Für Objekte mit sehr ähnlichen Absorptionskoeffizienten, wie gesundes und karzinogenes Gewebe liefert der Absorptionskontrast häufig unzureichende Informationen. Eine vielversprechende Methode einer kontrastreichen Bildgebung bietet jedoch die Phasenkontrast Bildgebung in einem Talbot-Interferometer. Hierfür werden Gitter mit hohen Aspektverhältnissen benötigt. Im Rahmen dieses Buchs wird der LIGAProzess genutzt, um erstmalig Gitter mit einem Aspektverhältnis von mindestens 100 herzustellen.
Talbot-Interferometer --- LIGA --- Aspektverhältnis --- Phasenkontrast --- Röntgenoptik
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Grating based X-ray phase contrast imaging sets out to overcome the limits of conventional X-ray imaging in the detection of subtle density differences and opens a way to characterize a sample’s microstructure without the need for ultrahigh spatial resolution. The technique relies on grating structures with micrometric periods and extreme aspect ratio – their fabrication by X-ray lithography with optimal structure quality is the topic of this work.
Talbot effect --- Röntgengitter --- LIGA --- X-ray optics --- Phasenkontrast --- Talbot-Effect --- phase contrast --- X-ray gratings --- Röntgenoptik
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Imaging methods such as X-ray microscopy are used in non-destructive material analysis to achieve resolutions in the sub micrometer range. Imaging optics are required, for which X-ray lenses are particularly suitable for photon energies above 10 keV. To ensure the universal use of these lenses with constant optical properties over a wide photon energy range, for the first time an X-ray zoom lens was developed in this work.
Röntgenmikroskopie --- X-ray lens --- zoom lens --- X-ray microscopy --- transfocator --- Zoomlinse --- Transfokator --- X-ray optic --- Röntgenoptik --- Röntgenlinse
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