Dark-field Tomography: Modeling and Reconstruction

2010/03/10 by Wenxiang Cong, Franz Pfeiffer, Cong, W. +9
Physics and Astronomy · Engineering · #Advanced X-ray Imaging Techniques #Digital Holography and Microscopy #Calibration and Measurement Techniques

paper · pdf · doi:10.48550/arxiv.1003.2155

Abstract

Dark-field images are formed by small-angle scattering of x-ray photons. The small-angle scattering signal is particularly sensitive to structural variations and density fluctuation on a length scale of several ten to hundred nanometers, offering a new contrast mechanism to reveal subtle structural variation of object. In this paper, we derive a novel physical model to describe x-ray absorption and small-angle scattering, and use the proposed model to reconstruct the volumetric small-angle scattering images. The numerical experiments and test experiments demonstrate that the reconstructed scattering images reveal unique features with a high contrast resolution. The proposed approach has great potential in biomedical imaging, nondestructive detections, and other applications.

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