Paganin DMBerujon SRougé-Labriet HNBrun EPavlov, KonstantinLi, Heyang2021-09-232021-09-232020Pavlov KM, Paganin DM, Li HT, Berujon S, Rougé-Labriet HN, Brun E (2020). X-ray multi-modal intrinsic-speckle-tracking. Journal of Optics (United Kingdom). 22(12). 125604-125604.2040-89782040-8986https://hdl.handle.net/10092/102552We develop x-ray multi-modal intrinsic-speckle-tracking (MIST), a form of x-ray speckle-tracking that is able to recover both the position-dependent phase shift and the position-dependent small-angle x-ray scattering (SAXS) signal of a phase object. MIST is based on combining a Fokker-Planck description of paraxial x-ray optics, with an optical-flow formalism for x-ray speckle-tracking. Only two images need to be taken in the presence of the sample, corresponding to two different transverse positions of the speckle-generating membrane, in order to recover both the refractive and local-SAXS properties of the sample. Like the optical-flow x-ray phase-retrieval method which it generalises, the MIST method implicitly rather than explicitly tracks both the transverse motion and the diffusion of speckles that is induced by the presence of a sample. Application to x-ray synchrotron data shows the method to be efficient, rapid and stable.enAll rights reserved unless otherwise statedeess.IVeess.IVphysics.app-phphysics.opticsJournal Article2021-07-020205 Optical Physics0206 Quantum Physics0906 Electrical and Electronic EngineeringFields of Research::51 - Physical sciences::5105 - Medical and biological physicsFields of Research::51 - Physical sciences::5102 - Atomic, molecular and optical physicsFields of Research::40 - Engineering::4003 - Biomedical engineeringhttp://doi.org/10.1088/2040-8986/abc313