Diffractive x-ray optics – more than just zone plates C ：X射线衍射光学–不止带板C.ppt

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2018-07-09 发布于重庆
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Diffractive x-ray optics – more than just zone plates C ：X射线衍射光学–不止带板C.ppt

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Diffractive x-ray optics – more than just zone plates C ：X射线衍射光学–不止带板C

Phase Contrast X-Ray Radiography and Tomography Based on a Grating Interferometer C. David, T. Weitkamp, A. DiazLaboratory for Micro- and Nanotechnology (LMN), Paul Scherrer Institut, Switzerland F. Pfeiffer, M. Stampanoni, J.F. van der Veen Swiss Light Source (SLS), Paul Scherrer Institut, Switzerland X-rays for medical imaging Improving contrast Improving contrast Improving contrast Improving contrast Phase contrast vs. amplitude contrast Phase contrast vs. amplitude contrast Phase contrast vs. amplitude contrast Phase contrast vs. amplitude contrast Phase contrast vs. amplitude contrast Phase contrast vs. amplitude contrast Phase contrast vs. amplitude contrast Propagation methods – edge contrast Propagation methods – edge contrast The gratings The gratings Edge contrast vs. Interferometric contrast Edge contrast vs. Interferometric contrast Polychromatic radiation Polychromatic radiation Polychromatic radiation Polychromatic radiation Polychromatic radiation Pink-beam phase tomography Pink-beam phase tomography Pink-beam phase tomography Pink-beam phase tomography Pink-beam phase tomography Pink-beam phase tomography Pink-beam phase tomography Required transverse coherence Required transverse coherence Required transverse coherence Required transverse coherence Required transverse coherence Summary Summary Summary Summary Acknowledgments Acknowledgments Three fibers Polyamide ? 225 μm Boron ? 200 μm, core: W ? 10 μm PBT ? 190 μm Sample: Differential phase contrast Phase contrast Edge contrast Edge contrast tomogram Phase contrast tomogram m s camera d s camera d In our experiments: E = 17.5 keV, = l = 0.07nm d = 28mm, = s = 1mm s camera d In our experiments: E = 17.5 keV, = l = 0.07nm d = 28mm, = s = 1mm Transverse coherence length c: c = l * p/s p: source distance, e.g. 2m s: source size, e.g. 100mm s camera d In our experiments: E = 17.5 keV, = l = 0.07nm d = 28mm, = s =