Evaluation of X-ray phase-contrast imaging with the Medipix

Bartl P, Michel T, Nachtrab F, Uhlmann N, Anton G (2011)

Publication Type: Journal article

Publication year: 2011

Journal

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Elsevier

Book Volume: 633

Pages Range: S143-S147

DOI: 10.1016/j.nima.2010.06.150

Abstract

In the recent decade phase-contrast imaging in the X-ray regime has been developed as a competitive alternative to conventional absorption radiography and computed tomography Wilkins et al. (1996) [1]. As phase-contrast is an energy dependent phenomenon, the use of a spectroscopic detector like the Medipix is a key tool to characterize and optimize imaging methods such as in-line or interferometric phase-contrast imaging. In the following the energy dependency of interference patterns caused by phase shifts in a coherent wavefront will be shown. Moreover, the spatial coherence of X-rays, considered as wavefronts, is crucial for the formation of detectable interference effects. The newest generations of X-ray sources produce small but finite focal spot sizes, so that partial spatial coherence of the wave-field has to be taken into account. The contribution of partial coherence to the image recorded in the detector plane has been investigated and the outcome will be presented. For a fuller understanding of a complete phase-contrast imaging setup the incoherent scattering effects were additionally simulated with Monte-Carlo methods. Furthermore, to develop a realistic simulation-tool for X-ray phase-contrast imaging, a good comprehension of the detection system is needed. This was also achieved by Monte-Carlo simulations. The comparison with measurements of the simulations of a complete setup shows a very good agreement.

Authors with CRIS profile

Peter Bartl Graduiertenzentrum der FAU Thilo Michel Lehrstuhl für Experimentelle Astroteilchenphysik Gisela Anton Lehrstuhl für Experimentelle Astroteilchenphysik

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials Erlangen Centre for Astroparticle Physics (ECAP)

Involved external institutions

Fraunhofer Development Center X-ray Technology (EZRT) DE Germany (DE)

How to cite

APA:

Bartl, P., Michel, T., Nachtrab, F., Uhlmann, N., & Anton, G. (2011). Evaluation of X-ray phase-contrast imaging with the Medipix. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 633, S143-S147. https://dx.doi.org/10.1016/j.nima.2010.06.150

MLA:

Bartl, Peter, et al. "Evaluation of X-ray phase-contrast imaging with the Medipix." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 633 (2011): S143-S147.

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