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Ultrasmall-angle x-ray scattering (USAXS) is sensitive to microstructures that are smaller than the imaging system's resolution, and therefore inaccessible via other contrast mechanisms. This comparison of two phase-contrast imaging techniques focuses on their differences in the retrieved absorption and USAXS signals. The results indicate that the retrieval method for speckle tracking needs revision, while beam tracking extracts the correct signal. This is a key result for implementing the beam-tracking method with laboratory (not beamline) x-ray sources, for tomographic applications from materials science to medicine.

Retrieving the Ultrasmall-Angle X-Ray Scattering Signal with Polychromatic Radiation in Speckle-Tracking and Beam-Tracking Phase-Contrast Imaging