Berlin 2012 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 2: Advanced Diagnostic Imaging II
ST 2.3: Vortrag
Montag, 26. März 2012, 15:40–16:00, HFT-FT 101
Quantitative grating-based X-ray phase contrast tomography at 82 keV — •Marian Willner1, Martin Bech1, Julia Herzen1, Dieter Hahn1, Johannes Kenntner2, Juergen Mohr2, Irene Zanette3, Alexander Rack3, Timm Weitkamp4, and Franz Pfeiffer1 — 1Department of Physics, Technische Universität München — 2Karlsruhe Institute of Technology (KIT) — 3European Synchrotron Radiation Facility (ESRF), France — 4Synchrotron Soleil, France
Grating-based X-ray phase contrast imaging has increasingly aroused interest as the method has been successfully adapted to work with laboratory X-ray sources. The high potential to improve the soft-tissue contrast compared to standard absorption-based tomography and the quantitativeness of the technique have been demonstrated at energies below 35 keV. However, a broad spectrum of applications in industrial testing and medical imaging needs the operation at higher X-ray energies. Technical advances in the grating manufacturing process make it possible to continuously push the existing energy limitations. In this work we report on the results of a first quantitative phase contrast tomography analysis of a high-energy phantom at 82 keV. The phantom consists of well-defined solid materials covering a wide range of densities and atomic numbers and was scanned with high-resolution at a synchrotron radiation source. The absorption and phase contrast images are analyzed in terms of signal-to-noise ratio (SNR), and the material-specific mass absorption coefficients and refractive index decrements are determined and compared to theoretical values.