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22 March 2010 Quantitative multimodal x-ray tomography: absorption, phase, and darkfield contrast
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Abstract
The basic principles of x-ray image formation in radiography have remained essentially unchanged since R¨ontgen first discovered x-rays over a hundred years ago. The conventional approach relies on x-ray absorption as the sole source of contrast and draws exclusively on ray or geometrical optics to describe and interpret image formation. This approach ignores another, potentially more useful source of contrast, namely phase and scattering information. Phase-contrast imaging techniques, which can be understood using wave optics rather than ray optics, offer ways to augment or complement standard absorption contrast by incorporating phase information. The recent development of grating based phase- and darkfield-contrast imaging with x-rays1 pawed the way for many potential applications to medical imaging and structure determination in material science. Here we present our recent contributions to the field of interferometric phase-contrast and dark-field x-ray imaging. We introduce a new material dependent scattering parameter, the Linear Diffusion Coefficient, and a quantitative mathematical formalism to extend the dark-field x-ray images into three dimensions by tomographic reconstruction. Further, the results of two experiments that illustrate the potential of dark-field imaging for computed tomography are shown.
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Martin Bech, Oliver Bunk, Tilman Donath, Robert Feidenhans'l, Christian David, and Franz Pfeiffer "Quantitative multimodal x-ray tomography: absorption, phase, and darkfield contrast", Proc. SPIE 7622, Medical Imaging 2010: Physics of Medical Imaging, 76220N (22 March 2010); https://doi.org/10.1117/12.845921
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