title: Hard-X-ray directional dark-field imaging using the speckle scanning technique.
abstract: X-ray dark-field imaging can provide inaccessible and complementary information compared to conventional absorption contrast imaging. However, extraction of the dark-field signal is difficult, and sophisticated optics are often required. In this Letter, we report a novel approach to generate high-quality dark-field images using a simple membrane. The dark-field image is extracted from the maximum correlation coefficient by applying a cross-correlation algorithm to a stack of speckle images collected by scanning a membrane in a transverse direction to the incident x-ray beam. The new method can also provide directional dark-field information, which is extremely useful for the study of strongly ordered systems. The potential of the proposed technique for nondestructive x-ray imaging is demonstrated by imaging representative samples.
authors: Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom.
authors: Hongchang
authors: H
authors: Wang
authors: Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom.
authors: Yogesh
authors: Y
authors: Kashyap
authors: Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom.
authors: Kawal
authors: K
authors: Sawhney
mesh_terms: D065638:Absorption, Radiation; D008567:Membranes, Artificial; D008962:Models, Theoretical; D061848:Optical Imaging / Q000295:instrumentation / Q000379:methods*; D011138:Polytetrafluoroethylene / Q000737:chemistry; D012408:Rubber / Q000737:chemistry; D056928:X-Ray Absorption Spectroscopy / Q000295:instrumentation / Q000379:methods*; D014965:X-Rays
chemical_list: D008567:Membranes, Artificial; D011138:Polytetrafluoroethylene; D012408:Rubber