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Hard X-ray Microscopy Enhanced by Coherent Image Reconstruction
X-ray microscopy is used to study the structure, dynamics and bulk properties of matter with high spatial resolutions. It is widely applied, from physics and chemistry to material and life sciences. In the past two decades, progress in X-ray microscopy was driven either by improvements in X-ray optics or by improvements in the image reconstruction by using algorithms as computational lenses. In this work both approaches are combined to exploit the advantages of X-ray imaging with a large numerical aperture and the advantages of coherent image reconstruction. It is shown that a combined X-ray microscope using both, advanced optics and algorithms, is neither limited by flawed optics nor by con...
Hard X-ray Microscopy Enhanced by Coherent Image Reconstruction
X-ray microscopy is used to study the structure, dynamics and bulk properties of matter with high spatial resolutions. It is widely applied, from physics and chemistry to material and life sciences. In the past two decades, progress in X-ray microscopy was driven either by improvements in X-ray optics or by improvements in the image reconstruction by using algorithms as computational lenses. In this work both approaches are combined to exploit the advantages of X-ray imaging with a large numerical aperture and the advantages of coherent image reconstruction. It is shown that a combined X-ray microscope using both, advanced optics and algorithms, is neither limited by flawed optics nor by con...
Multi-scale 3D Virtual Histology Via Phase-contrast X-ray Tomography with Synchrotron Radiation
To this day, the standard method for investigating biological tissue with cellular resolution is the examination under a light microscope, first denoted as histology by Karl Meyer in 1819. Despite the enormous success and importance of histology, it has two major disadvantages. Firstly, the specimen must be physically cut into thin sections due to the limited penetrating power of optical light, and secondly, additional staining of the specimen is required to achieve sufficient image contrast. Both disadvantages can be overcome by the non-destructive method of propagation-based X-ray phase-contrast tomography. While the mechanism of phase-contrast provides sufficient image contrast to image s...
X-Ray Near-Field Holography: Beyond Idealized Assumptions of the Probe
All images are flawed, no matter how good your lenses, mirrors etc. are. Especially in the hard X-ray regime it is challenging to manufacture high quality optics due to the weak interaction of multi-keV photons with matter. This is a tremendous challenge for obtaining high resolution quantitative X-ray microscopy images. In recent years lensless phase contrast imaging has become an alternative to classical absorptionbased imaging methods. Without any optics, the image is formed only by the free space propagation of the wave field. The actual image has to be formed posteriori by numerical reconstruction methods. Advanced phasing methods enable the experimentalist to recover a complex valued s...
Lauenburg
Lauenburg tanzt aus der Reihe. Als Territorium und als Ort. Seinen alten Namen Niedersachsen übernahm ein Bundesland, dem es nicht angehört. Einst kannten seine Nachbarherzogtümer Leibeigenschaft, später starken Nationalsozialismus. Beides war ihm fremd. Frauen standen wichtige Sonderrechte zu. Durch viele Jahrhunderte hindurch hatte der kleine Ort nur eine Kirche, aber fünf Bürgermeister zugleich. Über 10.000 Daten zum alten Baubestand dürften eine europäische Rarität sein. Familienforschern erschließen sich hundert frühneuzeitliche, kirchenbuchlose Jahre neu. Die Einwohner der Schifferstadt waren ungewöhnlich gebildet. Eine der schönsten Erzählungen Bert Brechts gewinnt Leuchtkraft durch einen Lauenburgischen Text. Der Band ergänzt die bereits vorliegende Stadtgeschichte «Stadt ohne Land am Fluß» desselben Autors.
