T. Rack

3.4 Developments in High-Resolution CT: Studying Bioregeneration by Hard X-Ray Synchrotron-Based Microtomography ☆

Alexander Rack, Paul Tafforeau, H. Riesemeier, Michael Stiller et autres

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Reflection on multilayer mirrors: beam profile and coherence properties

Alexander Rack, Christian Morawe, Lucia Mancini, Diego Dreossi et autres

The main advantage of Bragg reflection from a multilayer mirror as a monochromator for hard X-rays, is the higher photon flux density because of the larger spectral bandpass compared with crystal lattice reflection. The main disadvantage lies in the strong modulations of …

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An In Vitro Pilot Study of Abutment Stability During Loading in New and Fatigue-Loaded Conical Dental Implants Using Synchrotron-Based Radiography

T. Rack, Simon Zabler, Alexander Rack, H. Riesemeier et autres

Tanja Rack, MS/Simon Zabler, PhD/Alexander Rack, PhD/Heinrich Riesemeier, PhD/Katja Nelson, PhD, DDS: Purpose: The implant-abutment connection of a two-piece dental implant exhibits complex micromechanical behavior. A microgap is evident at the implant-abutment interface, even in the virgin state, and its width varies …

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Protocol to study wavefront preservation capabilities of reflective X-ray optics with coherent synchrotron light

Alexander Rack, Timm Weitkamp, Lahsen Assoufid, T. Rack et autres

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Partial decomposition of TiH2 studied in situ by energy-dispersive diffraction and ex situ by diffraction microtomography of hard X-ray synchrotron radiation

Catalina Jiménez, Francisco García‐Moreno, Alexander Rack, Rémi Tucoulou et autres

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Study of multilayer-reflected beam profiles and their coherence properties using beamlines ID19 (ESRF) and 32-ID (APS)

Alexander Rack, Lahsen Assoufid, R. Dietsch, Timm Weitkamp et autres

The use of multilayer mirrors is an interesting alternative for reflective X-ray monochromatization with respect to reflection from crystal optics. The increased photon flux density due to the multilayers' larger bandwidth is of crucial importance for, e.g, full-field X-ray imaging applications. Drawbacks …

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Coherent Synchrotron-Based Micro-Imaging Employed for Studies of Micro-Gap Formation in Dental Implants

T. Rack, Simon Zabler, Alexander Rack, Michael Stiller et autres

Biocompatible materials such as titanium are regularly applied in oral surgery. Titanium‐based implants for the replacement of missing teeth demand a high mechanical precision in order to minimize micro‐bacterial leakage, especially when two‐piece concepts are used. Synchrotron‐based hard x‐ray radiography, unlike conventional …

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Performance of Multilayer Monochromators for Hard X-Ray Imaging with Coherent Synchrotron Radiation

R. Dietsch, Alexander Rack, Timm Weitkamp, M. Riotte et autres

We present a study in which multilayers of different periodicity (from 2.5 to 5.5 nm), composition (W/Si, Mo/Si, Pd/B4C, Ru/B4C), and numbers of layers have been compared. Particularly, we chose mirrors with similar intrinsic quality (roughness and reflectivity) to study their performance …

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Developments in High-Resolution CT: Studying Bioregeneration by Hard X-ray Synchrotron-Based Microtomography

Alexander Rack, Michael Stiller, O. Dalügge, T. Rack et autres

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Coherence preservation and beam flatness of a single-bounce multilayer monochromator (beamline ID19—ESRF)

Alexander Rack, Timm Weitkamp, Irène Zanette, Ch. Morawe et autres

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Quantitative studies on inner interfaces in conical metal joints using hard x-ray inline phase contrast radiography

Simon Zabler, T. Rack, Alexander Rack, Katja Nelson

Quantitative investigation of micrometer and submicrometer gaps between joining metal surfaces is applied to conical plug-socket connections in dental titanium implants. Microgaps of widths well beyond the resolving power of industrial x-ray systems are imaged by synchrotron phase contrast radiography. Furthermore, by …

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Ex vivo and in vitro synchrotron-based micro-imaging of biocompatible materials applied in dental surgery

Alexander Rack, Michael Stiller, Katja Nelson, Christine Knabe et autres

Biocompatible materials such as porous bioactive calcium phosphate ceramics or titanium are regularly applied in dental surgery: ceramics are used to support the local bone regeneration in a given defect, afterwards titanium implants replace lost teeth. The current gold standard for bone …

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